/* * apply.c * * Copyright (C) Linus Torvalds, 2005 * * This applies patches on top of some (arbitrary) version of the SCM. * */ #include "cache.h" #include "blob.h" #include "delta.h" #include "diff.h" #include "dir.h" #include "xdiff-interface.h" #include "ll-merge.h" #include "lockfile.h" #include "parse-options.h" #include "quote.h" #include "rerere.h" #include "apply.h" static void git_apply_config(void) { git_config_get_string_const("apply.whitespace", &apply_default_whitespace); git_config_get_string_const("apply.ignorewhitespace", &apply_default_ignorewhitespace); git_config(git_default_config, NULL); } static int parse_whitespace_option(struct apply_state *state, const char *option) { if (!option) { state->ws_error_action = warn_on_ws_error; return 0; } if (!strcmp(option, "warn")) { state->ws_error_action = warn_on_ws_error; return 0; } if (!strcmp(option, "nowarn")) { state->ws_error_action = nowarn_ws_error; return 0; } if (!strcmp(option, "error")) { state->ws_error_action = die_on_ws_error; return 0; } if (!strcmp(option, "error-all")) { state->ws_error_action = die_on_ws_error; state->squelch_whitespace_errors = 0; return 0; } if (!strcmp(option, "strip") || !strcmp(option, "fix")) { state->ws_error_action = correct_ws_error; return 0; } return error(_("unrecognized whitespace option '%s'"), option); } static int parse_ignorewhitespace_option(struct apply_state *state, const char *option) { if (!option || !strcmp(option, "no") || !strcmp(option, "false") || !strcmp(option, "never") || !strcmp(option, "none")) { state->ws_ignore_action = ignore_ws_none; return 0; } if (!strcmp(option, "change")) { state->ws_ignore_action = ignore_ws_change; return 0; } return error(_("unrecognized whitespace ignore option '%s'"), option); } int init_apply_state(struct apply_state *state, const char *prefix, struct lock_file *lock_file) { memset(state, 0, sizeof(*state)); state->prefix = prefix; state->prefix_length = state->prefix ? strlen(state->prefix) : 0; state->lock_file = lock_file; state->newfd = -1; state->apply = 1; state->line_termination = '\n'; state->p_value = 1; state->p_context = UINT_MAX; state->squelch_whitespace_errors = 5; state->ws_error_action = warn_on_ws_error; state->ws_ignore_action = ignore_ws_none; state->linenr = 1; string_list_init(&state->fn_table, 0); string_list_init(&state->limit_by_name, 0); string_list_init(&state->symlink_changes, 0); strbuf_init(&state->root, 0); git_apply_config(); if (apply_default_whitespace && parse_whitespace_option(state, apply_default_whitespace)) return -1; if (apply_default_ignorewhitespace && parse_ignorewhitespace_option(state, apply_default_ignorewhitespace)) return -1; return 0; } void clear_apply_state(struct apply_state *state) { string_list_clear(&state->limit_by_name, 0); string_list_clear(&state->symlink_changes, 0); strbuf_release(&state->root); /* &state->fn_table is cleared at the end of apply_patch() */ } static void mute_routine(const char *msg, va_list params) { /* do nothing */ } int check_apply_state(struct apply_state *state, int force_apply) { int is_not_gitdir = !startup_info->have_repository; if (state->apply_with_reject && state->threeway) return error(_("--reject and --3way cannot be used together.")); if (state->cached && state->threeway) return error(_("--cached and --3way cannot be used together.")); if (state->threeway) { if (is_not_gitdir) return error(_("--3way outside a repository")); state->check_index = 1; } if (state->apply_with_reject) { state->apply = 1; if (state->apply_verbosity == verbosity_normal) state->apply_verbosity = verbosity_verbose; } if (!force_apply && (state->diffstat || state->numstat || state->summary || state->check || state->fake_ancestor)) state->apply = 0; if (state->check_index && is_not_gitdir) return error(_("--index outside a repository")); if (state->cached) { if (is_not_gitdir) return error(_("--cached outside a repository")); state->check_index = 1; } if (state->check_index) state->unsafe_paths = 0; if (!state->lock_file) return error("BUG: state->lock_file should not be NULL"); if (state->apply_verbosity <= verbosity_silent) { state->saved_error_routine = get_error_routine(); state->saved_warn_routine = get_warn_routine(); set_error_routine(mute_routine); set_warn_routine(mute_routine); } return 0; } static void set_default_whitespace_mode(struct apply_state *state) { if (!state->whitespace_option && !apply_default_whitespace) state->ws_error_action = (state->apply ? warn_on_ws_error : nowarn_ws_error); } /* * This represents one "hunk" from a patch, starting with * "@@ -oldpos,oldlines +newpos,newlines @@" marker. The * patch text is pointed at by patch, and its byte length * is stored in size. leading and trailing are the number * of context lines. */ struct fragment { unsigned long leading, trailing; unsigned long oldpos, oldlines; unsigned long newpos, newlines; /* * 'patch' is usually borrowed from buf in apply_patch(), * but some codepaths store an allocated buffer. */ const char *patch; unsigned free_patch:1, rejected:1; int size; int linenr; struct fragment *next; }; /* * When dealing with a binary patch, we reuse "leading" field * to store the type of the binary hunk, either deflated "delta" * or deflated "literal". */ #define binary_patch_method leading #define BINARY_DELTA_DEFLATED 1 #define BINARY_LITERAL_DEFLATED 2 /* * This represents a "patch" to a file, both metainfo changes * such as creation/deletion, filemode and content changes represented * as a series of fragments. */ struct patch { char *new_name, *old_name, *def_name; unsigned int old_mode, new_mode; int is_new, is_delete; /* -1 = unknown, 0 = false, 1 = true */ int rejected; unsigned ws_rule; int lines_added, lines_deleted; int score; int extension_linenr; /* first line specifying delete/new/rename/copy */ unsigned int is_toplevel_relative:1; unsigned int inaccurate_eof:1; unsigned int is_binary:1; unsigned int is_copy:1; unsigned int is_rename:1; unsigned int recount:1; unsigned int conflicted_threeway:1; unsigned int direct_to_threeway:1; struct fragment *fragments; char *result; size_t resultsize; char old_sha1_prefix[41]; char new_sha1_prefix[41]; struct patch *next; /* three-way fallback result */ struct object_id threeway_stage[3]; }; static void free_fragment_list(struct fragment *list) { while (list) { struct fragment *next = list->next; if (list->free_patch) free((char *)list->patch); free(list); list = next; } } static void free_patch(struct patch *patch) { free_fragment_list(patch->fragments); free(patch->def_name); free(patch->old_name); free(patch->new_name); free(patch->result); free(patch); } static void free_patch_list(struct patch *list) { while (list) { struct patch *next = list->next; free_patch(list); list = next; } } /* * A line in a file, len-bytes long (includes the terminating LF, * except for an incomplete line at the end if the file ends with * one), and its contents hashes to 'hash'. */ struct line { size_t len; unsigned hash : 24; unsigned flag : 8; #define LINE_COMMON 1 #define LINE_PATCHED 2 }; /* * This represents a "file", which is an array of "lines". */ struct image { char *buf; size_t len; size_t nr; size_t alloc; struct line *line_allocated; struct line *line; }; static uint32_t hash_line(const char *cp, size_t len) { size_t i; uint32_t h; for (i = 0, h = 0; i < len; i++) { if (!isspace(cp[i])) { h = h * 3 + (cp[i] & 0xff); } } return h; } /* * Compare lines s1 of length n1 and s2 of length n2, ignoring * whitespace difference. Returns 1 if they match, 0 otherwise */ static int fuzzy_matchlines(const char *s1, size_t n1, const char *s2, size_t n2) { const char *last1 = s1 + n1 - 1; const char *last2 = s2 + n2 - 1; int result = 0; /* ignore line endings */ while ((*last1 == '\r') || (*last1 == '\n')) last1--; while ((*last2 == '\r') || (*last2 == '\n')) last2--; /* skip leading whitespaces, if both begin with whitespace */ if (s1 <= last1 && s2 <= last2 && isspace(*s1) && isspace(*s2)) { while (isspace(*s1) && (s1 <= last1)) s1++; while (isspace(*s2) && (s2 <= last2)) s2++; } /* early return if both lines are empty */ if ((s1 > last1) && (s2 > last2)) return 1; while (!result) { result = *s1++ - *s2++; /* * Skip whitespace inside. We check for whitespace on * both buffers because we don't want "a b" to match * "ab" */ if (isspace(*s1) && isspace(*s2)) { while (isspace(*s1) && s1 <= last1) s1++; while (isspace(*s2) && s2 <= last2) s2++; } /* * If we reached the end on one side only, * lines don't match */ if ( ((s2 > last2) && (s1 <= last1)) || ((s1 > last1) && (s2 <= last2))) return 0; if ((s1 > last1) && (s2 > last2)) break; } return !result; } static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag) { ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc); img->line_allocated[img->nr].len = len; img->line_allocated[img->nr].hash = hash_line(bol, len); img->line_allocated[img->nr].flag = flag; img->nr++; } /* * "buf" has the file contents to be patched (read from various sources). * attach it to "image" and add line-based index to it. * "image" now owns the "buf". */ static void prepare_image(struct image *image, char *buf, size_t len, int prepare_linetable) { const char *cp, *ep; memset(image, 0, sizeof(*image)); image->buf = buf; image->len = len; if (!prepare_linetable) return; ep = image->buf + image->len; cp = image->buf; while (cp < ep) { const char *next; for (next = cp; next < ep && *next != '\n'; next++) ; if (next < ep) next++; add_line_info(image, cp, next - cp, 0); cp = next; } image->line = image->line_allocated; } static void clear_image(struct image *image) { free(image->buf); free(image->line_allocated); memset(image, 0, sizeof(*image)); } /* fmt must contain _one_ %s and no other substitution */ static void say_patch_name(FILE *output, const char *fmt, struct patch *patch) { struct strbuf sb = STRBUF_INIT; if (patch->old_name && patch->new_name && strcmp(patch->old_name, patch->new_name)) { quote_c_style(patch->old_name, &sb, NULL, 0); strbuf_addstr(&sb, " => "); quote_c_style(patch->new_name, &sb, NULL, 0); } else { const char *n = patch->new_name; if (!n) n = patch->old_name; quote_c_style(n, &sb, NULL, 0); } fprintf(output, fmt, sb.buf); fputc('\n', output); strbuf_release(&sb); } #define SLOP (16) static int read_patch_file(struct strbuf *sb, int fd) { if (strbuf_read(sb, fd, 0) < 0) return error_errno("git apply: failed to read"); /* * Make sure that we have some slop in the buffer * so that we can do speculative "memcmp" etc, and * see to it that it is NUL-filled. */ strbuf_grow(sb, SLOP); memset(sb->buf + sb->len, 0, SLOP); return 0; } static unsigned long linelen(const char *buffer, unsigned long size) { unsigned long len = 0; while (size--) { len++; if (*buffer++ == '\n') break; } return len; } static int is_dev_null(const char *str) { return skip_prefix(str, "/dev/null", &str) && isspace(*str); } #define TERM_SPACE 1 #define TERM_TAB 2 static int name_terminate(int c, int terminate) { if (c == ' ' && !(terminate & TERM_SPACE)) return 0; if (c == '\t' && !(terminate & TERM_TAB)) return 0; return 1; } /* remove double slashes to make --index work with such filenames */ static char *squash_slash(char *name) { int i = 0, j = 0; if (!name) return NULL; while (name[i]) { if ((name[j++] = name[i++]) == '/') while (name[i] == '/') i++; } name[j] = '\0'; return name; } static char *find_name_gnu(struct apply_state *state, const char *line, const char *def, int p_value) { struct strbuf name = STRBUF_INIT; char *cp; /* * Proposed "new-style" GNU patch/diff format; see * http://marc.info/?l=git&m=112927316408690&w=2 */ if (unquote_c_style(&name, line, NULL)) { strbuf_release(&name); return NULL; } for (cp = name.buf; p_value; p_value--) { cp = strchr(cp, '/'); if (!cp) { strbuf_release(&name); return NULL; } cp++; } strbuf_remove(&name, 0, cp - name.buf); if (state->root.len) strbuf_insert(&name, 0, state->root.buf, state->root.len); return squash_slash(strbuf_detach(&name, NULL)); } static size_t sane_tz_len(const char *line, size_t len) { const char *tz, *p; if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ') return 0; tz = line + len - strlen(" +0500"); if (tz[1] != '+' && tz[1] != '-') return 0; for (p = tz + 2; p != line + len; p++) if (!isdigit(*p)) return 0; return line + len - tz; } static size_t tz_with_colon_len(const char *line, size_t len) { const char *tz, *p; if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':') return 0; tz = line + len - strlen(" +08:00"); if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-')) return 0; p = tz + 2; if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' || !isdigit(*p++) || !isdigit(*p++)) return 0; return line + len - tz; } static size_t date_len(const char *line, size_t len) { const char *date, *p; if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-') return 0; p = date = line + len - strlen("72-02-05"); if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' || !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' || !isdigit(*p++) || !isdigit(*p++)) /* Not a date. */ return 0; if (date - line >= strlen("19") && isdigit(date[-1]) && isdigit(date[-2])) /* 4-digit year */ date -= strlen("19"); return line + len - date; } static size_t short_time_len(const char *line, size_t len) { const char *time, *p; if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':') return 0; p = time = line + len - strlen(" 07:01:32"); /* Permit 1-digit hours? */ if (*p++ != ' ' || !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' || !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' || !isdigit(*p++) || !isdigit(*p++)) /* Not a time. */ return 0; return line + len - time; } static size_t fractional_time_len(const char *line, size_t len) { const char *p; size_t n; /* Expected format: 19:41:17.620000023 */ if (!len || !isdigit(line[len - 1])) return 0; p = line + len - 1; /* Fractional seconds. */ while (p > line && isdigit(*p)) p--; if (*p != '.') return 0; /* Hours, minutes, and whole seconds. */ n = short_time_len(line, p - line); if (!n) return 0; return line + len - p + n; } static size_t trailing_spaces_len(const char *line, size_t len) { const char *p; /* Expected format: ' ' x (1 or more) */ if (!len || line[len - 1] != ' ') return 0; p = line + len; while (p != line) { p--; if (*p != ' ') return line + len - (p + 1); } /* All spaces! */ return len; } static size_t diff_timestamp_len(const char *line, size_t len) { const char *end = line + len; size_t n; /* * Posix: 2010-07-05 19:41:17 * GNU: 2010-07-05 19:41:17.620000023 -0500 */ if (!isdigit(end[-1])) return 0; n = sane_tz_len(line, end - line); if (!n) n = tz_with_colon_len(line, end - line); end -= n; n = short_time_len(line, end - line); if (!n) n = fractional_time_len(line, end - line); end -= n; n = date_len(line, end - line); if (!n) /* No date. Too bad. */ return 0; end -= n; if (end == line) /* No space before date. */ return 0; if (end[-1] == '\t') { /* Success! */ end--; return line + len - end; } if (end[-1] != ' ') /* No space before date. */ return 0; /* Whitespace damage. */ end -= trailing_spaces_len(line, end - line); return line + len - end; } static char *find_name_common(struct apply_state *state, const char *line, const char *def, int p_value, const char *end, int terminate) { int len; const char *start = NULL; if (p_value == 0) start = line; while (line != end) { char c = *line; if (!end && isspace(c)) { if (c == '\n') break; if (name_terminate(c, terminate)) break; } line++; if (c == '/' && !--p_value) start = line; } if (!start) return squash_slash(xstrdup_or_null(def)); len = line - start; if (!len) return squash_slash(xstrdup_or_null(def)); /* * Generally we prefer the shorter name, especially * if the other one is just a variation of that with * something else tacked on to the end (ie "file.orig" * or "file~"). */ if (def) { int deflen = strlen(def); if (deflen < len && !strncmp(start, def, deflen)) return squash_slash(xstrdup(def)); } if (state->root.len) { char *ret = xstrfmt("%s%.*s", state->root.buf, len, start); return squash_slash(ret); } return squash_slash(xmemdupz(start, len)); } static char *find_name(struct apply_state *state, const char *line, char *def, int p_value, int terminate) { if (*line == '"') { char *name = find_name_gnu(state, line, def, p_value); if (name) return name; } return find_name_common(state, line, def, p_value, NULL, terminate); } static char *find_name_traditional(struct apply_state *state, const char *line, char *def, int p_value) { size_t len; size_t date_len; if (*line == '"') { char *name = find_name_gnu(state, line, def, p_value); if (name) return name; } len = strchrnul(line, '\n') - line; date_len = diff_timestamp_len(line, len); if (!date_len) return find_name_common(state, line, def, p_value, NULL, TERM_TAB); len -= date_len; return find_name_common(state, line, def, p_value, line + len, 0); } static int count_slashes(const char *cp) { int cnt = 0; char ch; while ((ch = *cp++)) if (ch == '/') cnt++; return cnt; } /* * Given the string after "--- " or "+++ ", guess the appropriate * p_value for the given patch. */ static int guess_p_value(struct apply_state *state, const char *nameline) { char *name, *cp; int val = -1; if (is_dev_null(nameline)) return -1; name = find_name_traditional(state, nameline, NULL, 0); if (!name) return -1; cp = strchr(name, '/'); if (!cp) val = 0; else if (state->prefix) { /* * Does it begin with "a/$our-prefix" and such? Then this is * very likely to apply to our directory. */ if (!strncmp(name, state->prefix, state->prefix_length)) val = count_slashes(state->prefix); else { cp++; if (!strncmp(cp, state->prefix, state->prefix_length)) val = count_slashes(state->prefix) + 1; } } free(name); return val; } /* * Does the ---/+++ line have the POSIX timestamp after the last HT? * GNU diff puts epoch there to signal a creation/deletion event. Is * this such a timestamp? */ static int has_epoch_timestamp(const char *nameline) { /* * We are only interested in epoch timestamp; any non-zero * fraction cannot be one, hence "(\.0+)?" in the regexp below. * For the same reason, the date must be either 1969-12-31 or * 1970-01-01, and the seconds part must be "00". */ const char stamp_regexp[] = "^(1969-12-31|1970-01-01)" " " "[0-2][0-9]:[0-5][0-9]:00(\\.0+)?" " " "([-+][0-2][0-9]:?[0-5][0-9])\n"; const char *timestamp = NULL, *cp, *colon; static regex_t *stamp; regmatch_t m[10]; int zoneoffset; int hourminute; int status; for (cp = nameline; *cp != '\n'; cp++) { if (*cp == '\t') timestamp = cp + 1; } if (!timestamp) return 0; if (!stamp) { stamp = xmalloc(sizeof(*stamp)); if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) { warning(_("Cannot prepare timestamp regexp %s"), stamp_regexp); return 0; } } status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0); if (status) { if (status != REG_NOMATCH) warning(_("regexec returned %d for input: %s"), status, timestamp); return 0; } zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10); if (*colon == ':') zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10); else zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100); if (timestamp[m[3].rm_so] == '-') zoneoffset = -zoneoffset; /* * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31 * (west of GMT) or 1970-01-01 (east of GMT) */ if ((zoneoffset < 0 && memcmp(timestamp, "1969-12-31", 10)) || (0 <= zoneoffset && memcmp(timestamp, "1970-01-01", 10))) return 0; hourminute = (strtol(timestamp + 11, NULL, 10) * 60 + strtol(timestamp + 14, NULL, 10) - zoneoffset); return ((zoneoffset < 0 && hourminute == 1440) || (0 <= zoneoffset && !hourminute)); } /* * Get the name etc info from the ---/+++ lines of a traditional patch header * * FIXME! The end-of-filename heuristics are kind of screwy. For existing * files, we can happily check the index for a match, but for creating a * new file we should try to match whatever "patch" does. I have no idea. */ static int parse_traditional_patch(struct apply_state *state, const char *first, const char *second, struct patch *patch) { char *name; first += 4; /* skip "--- " */ second += 4; /* skip "+++ " */ if (!state->p_value_known) { int p, q; p = guess_p_value(state, first); q = guess_p_value(state, second); if (p < 0) p = q; if (0 <= p && p == q) { state->p_value = p; state->p_value_known = 1; } } if (is_dev_null(first)) { patch->is_new = 1; patch->is_delete = 0; name = find_name_traditional(state, second, NULL, state->p_value); patch->new_name = name; } else if (is_dev_null(second)) { patch->is_new = 0; patch->is_delete = 1; name = find_name_traditional(state, first, NULL, state->p_value); patch->old_name = name; } else { char *first_name; first_name = find_name_traditional(state, first, NULL, state->p_value); name = find_name_traditional(state, second, first_name, state->p_value); free(first_name); if (has_epoch_timestamp(first)) { patch->is_new = 1; patch->is_delete = 0; patch->new_name = name; } else if (has_epoch_timestamp(second)) { patch->is_new = 0; patch->is_delete = 1; patch->old_name = name; } else { patch->old_name = name; patch->new_name = xstrdup_or_null(name); } } if (!name) return error(_("unable to find filename in patch at line %d"), state->linenr); return 0; } static int gitdiff_hdrend(struct apply_state *state, const char *line, struct patch *patch) { return 1; } /* * We're anal about diff header consistency, to make * sure that we don't end up having strange ambiguous * patches floating around. * * As a result, gitdiff_{old|new}name() will check * their names against any previous information, just * to make sure.. */ #define DIFF_OLD_NAME 0 #define DIFF_NEW_NAME 1 static int gitdiff_verify_name(struct apply_state *state, const char *line, int isnull, char **name, int side) { if (!*name && !isnull) { *name = find_name(state, line, NULL, state->p_value, TERM_TAB); return 0; } if (*name) { char *another; if (isnull) return error(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"), *name, state->linenr); another = find_name(state, line, NULL, state->p_value, TERM_TAB); if (!another || strcmp(another, *name)) { free(another); return error((side == DIFF_NEW_NAME) ? _("git apply: bad git-diff - inconsistent new filename on line %d") : _("git apply: bad git-diff - inconsistent old filename on line %d"), state->linenr); } free(another); } else { if (!starts_with(line, "/dev/null\n")) return error(_("git apply: bad git-diff - expected /dev/null on line %d"), state->linenr); } return 0; } static int gitdiff_oldname(struct apply_state *state, const char *line, struct patch *patch) { return gitdiff_verify_name(state, line, patch->is_new, &patch->old_name, DIFF_OLD_NAME); } static int gitdiff_newname(struct apply_state *state, const char *line, struct patch *patch) { return gitdiff_verify_name(state, line, patch->is_delete, &patch->new_name, DIFF_NEW_NAME); } static int parse_mode_line(const char *line, int linenr, unsigned int *mode) { char *end; *mode = strtoul(line, &end, 8); if (end == line || !isspace(*end)) return error(_("invalid mode on line %d: %s"), linenr, line); return 0; } static int gitdiff_oldmode(struct apply_state *state, const char *line, struct patch *patch) { return parse_mode_line(line, state->linenr, &patch->old_mode); } static int gitdiff_newmode(struct apply_state *state, const char *line, struct patch *patch) { return parse_mode_line(line, state->linenr, &patch->new_mode); } static int gitdiff_delete(struct apply_state *state, const char *line, struct patch *patch) { patch->is_delete = 1; free(patch->old_name); patch->old_name = xstrdup_or_null(patch->def_name); return gitdiff_oldmode(state, line, patch); } static int gitdiff_newfile(struct apply_state *state, const char *line, struct patch *patch) { patch->is_new = 1; free(patch->new_name); patch->new_name = xstrdup_or_null(patch->def_name); return gitdiff_newmode(state, line, patch); } static int gitdiff_copysrc(struct apply_state *state, const char *line, struct patch *patch) { patch->is_copy = 1; free(patch->old_name); patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); return 0; } static int gitdiff_copydst(struct apply_state *state, const char *line, struct patch *patch) { patch->is_copy = 1; free(patch->new_name); patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); return 0; } static int gitdiff_renamesrc(struct apply_state *state, const char *line, struct patch *patch) { patch->is_rename = 1; free(patch->old_name); patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); return 0; } static int gitdiff_renamedst(struct apply_state *state, const char *line, struct patch *patch) { patch->is_rename = 1; free(patch->new_name); patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0); return 0; } static int gitdiff_similarity(struct apply_state *state, const char *line, struct patch *patch) { unsigned long val = strtoul(line, NULL, 10); if (val <= 100) patch->score = val; return 0; } static int gitdiff_dissimilarity(struct apply_state *state, const char *line, struct patch *patch) { unsigned long val = strtoul(line, NULL, 10); if (val <= 100) patch->score = val; return 0; } static int gitdiff_index(struct apply_state *state, const char *line, struct patch *patch) { /* * index line is N hexadecimal, "..", N hexadecimal, * and optional space with octal mode. */ const char *ptr, *eol; int len; ptr = strchr(line, '.'); if (!ptr || ptr[1] != '.' || 40 < ptr - line) return 0; len = ptr - line; memcpy(patch->old_sha1_prefix, line, len); patch->old_sha1_prefix[len] = 0; line = ptr + 2; ptr = strchr(line, ' '); eol = strchrnul(line, '\n'); if (!ptr || eol < ptr) ptr = eol; len = ptr - line; if (40 < len) return 0; memcpy(patch->new_sha1_prefix, line, len); patch->new_sha1_prefix[len] = 0; if (*ptr == ' ') return gitdiff_oldmode(state, ptr + 1, patch); return 0; } /* * This is normal for a diff that doesn't change anything: we'll fall through * into the next diff. Tell the parser to break out. */ static int gitdiff_unrecognized(struct apply_state *state, const char *line, struct patch *patch) { return 1; } /* * Skip p_value leading components from "line"; as we do not accept * absolute paths, return NULL in that case. */ static const char *skip_tree_prefix(struct apply_state *state, const char *line, int llen) { int nslash; int i; if (!state->p_value) return (llen && line[0] == '/') ? NULL : line; nslash = state->p_value; for (i = 0; i < llen; i++) { int ch = line[i]; if (ch == '/' && --nslash <= 0) return (i == 0) ? NULL : &line[i + 1]; } return NULL; } /* * This is to extract the same name that appears on "diff --git" * line. We do not find and return anything if it is a rename * patch, and it is OK because we will find the name elsewhere. * We need to reliably find name only when it is mode-change only, * creation or deletion of an empty file. In any of these cases, * both sides are the same name under a/ and b/ respectively. */ static char *git_header_name(struct apply_state *state, const char *line, int llen) { const char *name; const char *second = NULL; size_t len, line_len; line += strlen("diff --git "); llen -= strlen("diff --git "); if (*line == '"') { const char *cp; struct strbuf first = STRBUF_INIT; struct strbuf sp = STRBUF_INIT; if (unquote_c_style(&first, line, &second)) goto free_and_fail1; /* strip the a/b prefix including trailing slash */ cp = skip_tree_prefix(state, first.buf, first.len); if (!cp) goto free_and_fail1; strbuf_remove(&first, 0, cp - first.buf); /* * second points at one past closing dq of name. * find the second name. */ while ((second < line + llen) && isspace(*second)) second++; if (line + llen <= second) goto free_and_fail1; if (*second == '"') { if (unquote_c_style(&sp, second, NULL)) goto free_and_fail1; cp = skip_tree_prefix(state, sp.buf, sp.len); if (!cp) goto free_and_fail1; /* They must match, otherwise ignore */ if (strcmp(cp, first.buf)) goto free_and_fail1; strbuf_release(&sp); return strbuf_detach(&first, NULL); } /* unquoted second */ cp = skip_tree_prefix(state, second, line + llen - second); if (!cp) goto free_and_fail1; if (line + llen - cp != first.len || memcmp(first.buf, cp, first.len)) goto free_and_fail1; return strbuf_detach(&first, NULL); free_and_fail1: strbuf_release(&first); strbuf_release(&sp); return NULL; } /* unquoted first name */ name = skip_tree_prefix(state, line, llen); if (!name) return NULL; /* * since the first name is unquoted, a dq if exists must be * the beginning of the second name. */ for (second = name; second < line + llen; second++) { if (*second == '"') { struct strbuf sp = STRBUF_INIT; const char *np; if (unquote_c_style(&sp, second, NULL)) goto free_and_fail2; np = skip_tree_prefix(state, sp.buf, sp.len); if (!np) goto free_and_fail2; len = sp.buf + sp.len - np; if (len < second - name && !strncmp(np, name, len) && isspace(name[len])) { /* Good */ strbuf_remove(&sp, 0, np - sp.buf); return strbuf_detach(&sp, NULL); } free_and_fail2: strbuf_release(&sp); return NULL; } } /* * Accept a name only if it shows up twice, exactly the same * form. */ second = strchr(name, '\n'); if (!second) return NULL; line_len = second - name; for (len = 0 ; ; len++) { switch (name[len]) { default: continue; case '\n': return NULL; case '\t': case ' ': /* * Is this the separator between the preimage * and the postimage pathname? Again, we are * only interested in the case where there is * no rename, as this is only to set def_name * and a rename patch has the names elsewhere * in an unambiguous form. */ if (!name[len + 1]) return NULL; /* no postimage name */ second = skip_tree_prefix(state, name + len + 1, line_len - (len + 1)); if (!second) return NULL; /* * Does len bytes starting at "name" and "second" * (that are separated by one HT or SP we just * found) exactly match? */ if (second[len] == '\n' && !strncmp(name, second, len)) return xmemdupz(name, len); } } } static int check_header_line(struct apply_state *state, struct patch *patch) { int extensions = (patch->is_delete == 1) + (patch->is_new == 1) + (patch->is_rename == 1) + (patch->is_copy == 1); if (extensions > 1) return error(_("inconsistent header lines %d and %d"), patch->extension_linenr, state->linenr); if (extensions && !patch->extension_linenr) patch->extension_linenr = state->linenr; return 0; } /* Verify that we recognize the lines following a git header */ static int parse_git_header(struct apply_state *state, const char *line, int len, unsigned int size, struct patch *patch) { unsigned long offset; /* A git diff has explicit new/delete information, so we don't guess */ patch->is_new = 0; patch->is_delete = 0; /* * Some things may not have the old name in the * rest of the headers anywhere (pure mode changes, * or removing or adding empty files), so we get * the default name from the header. */ patch->def_name = git_header_name(state, line, len); if (patch->def_name && state->root.len) { char *s = xstrfmt("%s%s", state->root.buf, patch->def_name); free(patch->def_name); patch->def_name = s; } line += len; size -= len; state->linenr++; for (offset = len ; size > 0 ; offset += len, size -= len, line += len, state->linenr++) { static const struct opentry { const char *str; int (*fn)(struct apply_state *, const char *, struct patch *); } optable[] = { { "@@ -", gitdiff_hdrend }, { "--- ", gitdiff_oldname }, { "+++ ", gitdiff_newname }, { "old mode ", gitdiff_oldmode }, { "new mode ", gitdiff_newmode }, { "deleted file mode ", gitdiff_delete }, { "new file mode ", gitdiff_newfile }, { "copy from ", gitdiff_copysrc }, { "copy to ", gitdiff_copydst }, { "rename old ", gitdiff_renamesrc }, { "rename new ", gitdiff_renamedst }, { "rename from ", gitdiff_renamesrc }, { "rename to ", gitdiff_renamedst }, { "similarity index ", gitdiff_similarity }, { "dissimilarity index ", gitdiff_dissimilarity }, { "index ", gitdiff_index }, { "", gitdiff_unrecognized }, }; int i; len = linelen(line, size); if (!len || line[len-1] != '\n') break; for (i = 0; i < ARRAY_SIZE(optable); i++) { const struct opentry *p = optable + i; int oplen = strlen(p->str); int res; if (len < oplen || memcmp(p->str, line, oplen)) continue; res = p->fn(state, line + oplen, patch); if (res < 0) return -1; if (check_header_line(state, patch)) return -1; if (res > 0) return offset; break; } } return offset; } static int parse_num(const char *line, unsigned long *p) { char *ptr; if (!isdigit(*line)) return 0; *p = strtoul(line, &ptr, 10); return ptr - line; } static int parse_range(const char *line, int len, int offset, const char *expect, unsigned long *p1, unsigned long *p2) { int digits, ex; if (offset < 0 || offset >= len) return -1; line += offset; len -= offset; digits = parse_num(line, p1); if (!digits) return -1; offset += digits; line += digits; len -= digits; *p2 = 1; if (*line == ',') { digits = parse_num(line+1, p2); if (!digits) return -1; offset += digits+1; line += digits+1; len -= digits+1; } ex = strlen(expect); if (ex > len) return -1; if (memcmp(line, expect, ex)) return -1; return offset + ex; } static void recount_diff(const char *line, int size, struct fragment *fragment) { int oldlines = 0, newlines = 0, ret = 0; if (size < 1) { warning("recount: ignore empty hunk"); return; } for (;;) { int len = linelen(line, size); size -= len; line += len; if (size < 1) break; switch (*line) { case ' ': case '\n': newlines++; /* fall through */ case '-': oldlines++; continue; case '+': newlines++; continue; case '\\': continue; case '@': ret = size < 3 || !starts_with(line, "@@ "); break; case 'd': ret = size < 5 || !starts_with(line, "diff "); break; default: ret = -1; break; } if (ret) { warning(_("recount: unexpected line: %.*s"), (int)linelen(line, size), line); return; } break; } fragment->oldlines = oldlines; fragment->newlines = newlines; } /* * Parse a unified diff fragment header of the * form "@@ -a,b +c,d @@" */ static int parse_fragment_header(const char *line, int len, struct fragment *fragment) { int offset; if (!len || line[len-1] != '\n') return -1; /* Figure out the number of lines in a fragment */ offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines); offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines); return offset; } /* * Find file diff header * * Returns: * -1 if no header was found * -128 in case of error * the size of the header in bytes (called "offset") otherwise */ static int find_header(struct apply_state *state, const char *line, unsigned long size, int *hdrsize, struct patch *patch) { unsigned long offset, len; patch->is_toplevel_relative = 0; patch->is_rename = patch->is_copy = 0; patch->is_new = patch->is_delete = -1; patch->old_mode = patch->new_mode = 0; patch->old_name = patch->new_name = NULL; for (offset = 0; size > 0; offset += len, size -= len, line += len, state->linenr++) { unsigned long nextlen; len = linelen(line, size); if (!len) break; /* Testing this early allows us to take a few shortcuts.. */ if (len < 6) continue; /* * Make sure we don't find any unconnected patch fragments. * That's a sign that we didn't find a header, and that a * patch has become corrupted/broken up. */ if (!memcmp("@@ -", line, 4)) { struct fragment dummy; if (parse_fragment_header(line, len, &dummy) < 0) continue; error(_("patch fragment without header at line %d: %.*s"), state->linenr, (int)len-1, line); return -128; } if (size < len + 6) break; /* * Git patch? It might not have a real patch, just a rename * or mode change, so we handle that specially */ if (!memcmp("diff --git ", line, 11)) { int git_hdr_len = parse_git_header(state, line, len, size, patch); if (git_hdr_len < 0) return -128; if (git_hdr_len <= len) continue; if (!patch->old_name && !patch->new_name) { if (!patch->def_name) { error(Q_("git diff header lacks filename information when removing " "%d leading pathname component (line %d)", "git diff header lacks filename information when removing " "%d leading pathname components (line %d)", state->p_value), state->p_value, state->linenr); return -128; } patch->old_name = xstrdup(patch->def_name); patch->new_name = xstrdup(patch->def_name); } if ((!patch->new_name && !patch->is_delete) || (!patch->old_name && !patch->is_new)) { error(_("git diff header lacks filename information " "(line %d)"), state->linenr); return -128; } patch->is_toplevel_relative = 1; *hdrsize = git_hdr_len; return offset; } /* --- followed by +++ ? */ if (memcmp("--- ", line, 4) || memcmp("+++ ", line + len, 4)) continue; /* * We only accept unified patches, so we want it to * at least have "@@ -a,b +c,d @@\n", which is 14 chars * minimum ("@@ -0,0 +1 @@\n" is the shortest). */ nextlen = linelen(line + len, size - len); if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4)) continue; /* Ok, we'll consider it a patch */ if (parse_traditional_patch(state, line, line+len, patch)) return -128; *hdrsize = len + nextlen; state->linenr += 2; return offset; } return -1; } static void record_ws_error(struct apply_state *state, unsigned result, const char *line, int len, int linenr) { char *err; if (!result) return; state->whitespace_error++; if (state->squelch_whitespace_errors && state->squelch_whitespace_errors < state->whitespace_error) return; err = whitespace_error_string(result); if (state->apply_verbosity > verbosity_silent) fprintf(stderr, "%s:%d: %s.\n%.*s\n", state->patch_input_file, linenr, err, len, line); free(err); } static void check_whitespace(struct apply_state *state, const char *line, int len, unsigned ws_rule) { unsigned result = ws_check(line + 1, len - 1, ws_rule); record_ws_error(state, result, line + 1, len - 2, state->linenr); } /* * Parse a unified diff. Note that this really needs to parse each * fragment separately, since the only way to know the difference * between a "---" that is part of a patch, and a "---" that starts * the next patch is to look at the line counts.. */ static int parse_fragment(struct apply_state *state, const char *line, unsigned long size, struct patch *patch, struct fragment *fragment) { int added, deleted; int len = linelen(line, size), offset; unsigned long oldlines, newlines; unsigned long leading, trailing; offset = parse_fragment_header(line, len, fragment); if (offset < 0) return -1; if (offset > 0 && patch->recount) recount_diff(line + offset, size - offset, fragment); oldlines = fragment->oldlines; newlines = fragment->newlines; leading = 0; trailing = 0; /* Parse the thing.. */ line += len; size -= len; state->linenr++; added = deleted = 0; for (offset = len; 0 < size; offset += len, size -= len, line += len, state->linenr++) { if (!oldlines && !newlines) break; len = linelen(line, size); if (!len || line[len-1] != '\n') return -1; switch (*line) { default: return -1; case '\n': /* newer GNU diff, an empty context line */ case ' ': oldlines--; newlines--; if (!deleted && !added) leading++; trailing++; if (!state->apply_in_reverse && state->ws_error_action == correct_ws_error) check_whitespace(state, line, len, patch->ws_rule); break; case '-': if (state->apply_in_reverse && state->ws_error_action != nowarn_ws_error) check_whitespace(state, line, len, patch->ws_rule); deleted++; oldlines--; trailing = 0; break; case '+': if (!state->apply_in_reverse && state->ws_error_action != nowarn_ws_error) check_whitespace(state, line, len, patch->ws_rule); added++; newlines--; trailing = 0; break; /* * We allow "\ No newline at end of file". Depending * on locale settings when the patch was produced we * don't know what this line looks like. The only * thing we do know is that it begins with "\ ". * Checking for 12 is just for sanity check -- any * l10n of "\ No newline..." is at least that long. */ case '\\': if (len < 12 || memcmp(line, "\\ ", 2)) return -1; break; } } if (oldlines || newlines) return -1; if (!deleted && !added) return -1; fragment->leading = leading; fragment->trailing = trailing; /* * If a fragment ends with an incomplete line, we failed to include * it in the above loop because we hit oldlines == newlines == 0 * before seeing it. */ if (12 < size && !memcmp(line, "\\ ", 2)) offset += linelen(line, size); patch->lines_added += added; patch->lines_deleted += deleted; if (0 < patch->is_new && oldlines) return error(_("new file depends on old contents")); if (0 < patch->is_delete && newlines) return error(_("deleted file still has contents")); return offset; } /* * We have seen "diff --git a/... b/..." header (or a traditional patch * header). Read hunks that belong to this patch into fragments and hang * them to the given patch structure. * * The (fragment->patch, fragment->size) pair points into the memory given * by the caller, not a copy, when we return. * * Returns: * -1 in case of error, * the number of bytes in the patch otherwise. */ static int parse_single_patch(struct apply_state *state, const char *line, unsigned long size, struct patch *patch) { unsigned long offset = 0; unsigned long oldlines = 0, newlines = 0, context = 0; struct fragment **fragp = &patch->fragments; while (size > 4 && !memcmp(line, "@@ -", 4)) { struct fragment *fragment; int len; fragment = xcalloc(1, sizeof(*fragment)); fragment->linenr = state->linenr; len = parse_fragment(state, line, size, patch, fragment); if (len <= 0) { free(fragment); return error(_("corrupt patch at line %d"), state->linenr); } fragment->patch = line; fragment->size = len; oldlines += fragment->oldlines; newlines += fragment->newlines; context += fragment->leading + fragment->trailing; *fragp = fragment; fragp = &fragment->next; offset += len; line += len; size -= len; } /* * If something was removed (i.e. we have old-lines) it cannot * be creation, and if something was added it cannot be * deletion. However, the reverse is not true; --unified=0 * patches that only add are not necessarily creation even * though they do not have any old lines, and ones that only * delete are not necessarily deletion. * * Unfortunately, a real creation/deletion patch do _not_ have * any context line by definition, so we cannot safely tell it * apart with --unified=0 insanity. At least if the patch has * more than one hunk it is not creation or deletion. */ if (patch->is_new < 0 && (oldlines || (patch->fragments && patch->fragments->next))) patch->is_new = 0; if (patch->is_delete < 0 && (newlines || (patch->fragments && patch->fragments->next))) patch->is_delete = 0; if (0 < patch->is_new && oldlines) return error(_("new file %s depends on old contents"), patch->new_name); if (0 < patch->is_delete && newlines) return error(_("deleted file %s still has contents"), patch->old_name); if (!patch->is_delete && !newlines && context && state->apply_verbosity > verbosity_silent) fprintf_ln(stderr, _("** warning: " "file %s becomes empty but is not deleted"), patch->new_name); return offset; } static inline int metadata_changes(struct patch *patch) { return patch->is_rename > 0 || patch->is_copy > 0 || patch->is_new > 0 || patch->is_delete || (patch->old_mode && patch->new_mode && patch->old_mode != patch->new_mode); } static char *inflate_it(const void *data, unsigned long size, unsigned long inflated_size) { git_zstream stream; void *out; int st; memset(&stream, 0, sizeof(stream)); stream.next_in = (unsigned char *)data; stream.avail_in = size; stream.next_out = out = xmalloc(inflated_size); stream.avail_out = inflated_size; git_inflate_init(&stream); st = git_inflate(&stream, Z_FINISH); git_inflate_end(&stream); if ((st != Z_STREAM_END) || stream.total_out != inflated_size) { free(out); return NULL; } return out; } /* * Read a binary hunk and return a new fragment; fragment->patch * points at an allocated memory that the caller must free, so * it is marked as "->free_patch = 1". */ static struct fragment *parse_binary_hunk(struct apply_state *state, char **buf_p, unsigned long *sz_p, int *status_p, int *used_p) { /* * Expect a line that begins with binary patch method ("literal" * or "delta"), followed by the length of data before deflating. * a sequence of 'length-byte' followed by base-85 encoded data * should follow, terminated by a newline. * * Each 5-byte sequence of base-85 encodes up to 4 bytes, * and we would limit the patch line to 66 characters, * so one line can fit up to 13 groups that would decode * to 52 bytes max. The length byte 'A'-'Z' corresponds * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes. */ int llen, used; unsigned long size = *sz_p; char *buffer = *buf_p; int patch_method; unsigned long origlen; char *data = NULL; int hunk_size = 0; struct fragment *frag; llen = linelen(buffer, size); used = llen; *status_p = 0; if (starts_with(buffer, "delta ")) { patch_method = BINARY_DELTA_DEFLATED; origlen = strtoul(buffer + 6, NULL, 10); } else if (starts_with(buffer, "literal ")) { patch_method = BINARY_LITERAL_DEFLATED; origlen = strtoul(buffer + 8, NULL, 10); } else return NULL; state->linenr++; buffer += llen; while (1) { int byte_length, max_byte_length, newsize; llen = linelen(buffer, size); used += llen; state->linenr++; if (llen == 1) { /* consume the blank line */ buffer++; size--; break; } /* * Minimum line is "A00000\n" which is 7-byte long, * and the line length must be multiple of 5 plus 2. */ if ((llen < 7) || (llen-2) % 5) goto corrupt; max_byte_length = (llen - 2) / 5 * 4; byte_length = *buffer; if ('A' <= byte_length && byte_length <= 'Z') byte_length = byte_length - 'A' + 1; else if ('a' <= byte_length && byte_length <= 'z') byte_length = byte_length - 'a' + 27; else goto corrupt; /* if the input length was not multiple of 4, we would * have filler at the end but the filler should never * exceed 3 bytes */ if (max_byte_length < byte_length || byte_length <= max_byte_length - 4) goto corrupt; newsize = hunk_size + byte_length; data = xrealloc(data, newsize); if (decode_85(data + hunk_size, buffer + 1, byte_length)) goto corrupt; hunk_size = newsize; buffer += llen; size -= llen; } frag = xcalloc(1, sizeof(*frag)); frag->patch = inflate_it(data, hunk_size, origlen); frag->free_patch = 1; if (!frag->patch) goto corrupt; free(data); frag->size = origlen; *buf_p = buffer; *sz_p = size; *used_p = used; frag->binary_patch_method = patch_method; return frag; corrupt: free(data); *status_p = -1; error(_("corrupt binary patch at line %d: %.*s"), state->linenr-1, llen-1, buffer); return NULL; } /* * Returns: * -1 in case of error, * the length of the parsed binary patch otherwise */ static int parse_binary(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch) { /* * We have read "GIT binary patch\n"; what follows is a line * that says the patch method (currently, either "literal" or * "delta") and the length of data before deflating; a * sequence of 'length-byte' followed by base-85 encoded data * follows. * * When a binary patch is reversible, there is another binary * hunk in the same format, starting with patch method (either * "literal" or "delta") with the length of data, and a sequence * of length-byte + base-85 encoded data, terminated with another * empty line. This data, when applied to the postimage, produces * the preimage. */ struct fragment *forward; struct fragment *reverse; int status; int used, used_1; forward = parse_binary_hunk(state, &buffer, &size, &status, &used); if (!forward && !status) /* there has to be one hunk (forward hunk) */ return error(_("unrecognized binary patch at line %d"), state->linenr-1); if (status) /* otherwise we already gave an error message */ return status; reverse = parse_binary_hunk(state, &buffer, &size, &status, &used_1); if (reverse) used += used_1; else if (status) { /* * Not having reverse hunk is not an error, but having * a corrupt reverse hunk is. */ free((void*) forward->patch); free(forward); return status; } forward->next = reverse; patch->fragments = forward; patch->is_binary = 1; return used; } static void prefix_one(struct apply_state *state, char **name) { char *old_name = *name; if (!old_name) return; *name = prefix_filename(state->prefix, *name); free(old_name); } static void prefix_patch(struct apply_state *state, struct patch *p) { if (!state->prefix || p->is_toplevel_relative) return; prefix_one(state, &p->new_name); prefix_one(state, &p->old_name); } /* * include/exclude */ static void add_name_limit(struct apply_state *state, const char *name, int exclude) { struct string_list_item *it; it = string_list_append(&state->limit_by_name, name); it->util = exclude ? NULL : (void *) 1; } static int use_patch(struct apply_state *state, struct patch *p) { const char *pathname = p->new_name ? p->new_name : p->old_name; int i; /* Paths outside are not touched regardless of "--include" */ if (0 < state->prefix_length) { int pathlen = strlen(pathname); if (pathlen <= state->prefix_length || memcmp(state->prefix, pathname, state->prefix_length)) return 0; } /* See if it matches any of exclude/include rule */ for (i = 0; i < state->limit_by_name.nr; i++) { struct string_list_item *it = &state->limit_by_name.items[i]; if (!wildmatch(it->string, pathname, 0, NULL)) return (it->util != NULL); } /* * If we had any include, a path that does not match any rule is * not used. Otherwise, we saw bunch of exclude rules (or none) * and such a path is used. */ return !state->has_include; } /* * Read the patch text in "buffer" that extends for "size" bytes; stop * reading after seeing a single patch (i.e. changes to a single file). * Create fragments (i.e. patch hunks) and hang them to the given patch. * * Returns: * -1 if no header was found or parse_binary() failed, * -128 on another error, * the number of bytes consumed otherwise, * so that the caller can call us again for the next patch. */ static int parse_chunk(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch) { int hdrsize, patchsize; int offset = find_header(state, buffer, size, &hdrsize, patch); if (offset < 0) return offset; prefix_patch(state, patch); if (!use_patch(state, patch)) patch->ws_rule = 0; else patch->ws_rule = whitespace_rule(patch->new_name ? patch->new_name : patch->old_name); patchsize = parse_single_patch(state, buffer + offset + hdrsize, size - offset - hdrsize, patch); if (patchsize < 0) return -128; if (!patchsize) { static const char git_binary[] = "GIT binary patch\n"; int hd = hdrsize + offset; unsigned long llen = linelen(buffer + hd, size - hd); if (llen == sizeof(git_binary) - 1 && !memcmp(git_binary, buffer + hd, llen)) { int used; state->linenr++; used = parse_binary(state, buffer + hd + llen, size - hd - llen, patch); if (used < 0) return -1; if (used) patchsize = used + llen; else patchsize = 0; } else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) { static const char *binhdr[] = { "Binary files ", "Files ", NULL, }; int i; for (i = 0; binhdr[i]; i++) { int len = strlen(binhdr[i]); if (len < size - hd && !memcmp(binhdr[i], buffer + hd, len)) { state->linenr++; patch->is_binary = 1; patchsize = llen; break; } } } /* Empty patch cannot be applied if it is a text patch * without metadata change. A binary patch appears * empty to us here. */ if ((state->apply || state->check) && (!patch->is_binary && !metadata_changes(patch))) { error(_("patch with only garbage at line %d"), state->linenr); return -128; } } return offset + hdrsize + patchsize; } static void reverse_patches(struct patch *p) { for (; p; p = p->next) { struct fragment *frag = p->fragments; SWAP(p->new_name, p->old_name); SWAP(p->new_mode, p->old_mode); SWAP(p->is_new, p->is_delete); SWAP(p->lines_added, p->lines_deleted); SWAP(p->old_sha1_prefix, p->new_sha1_prefix); for (; frag; frag = frag->next) { SWAP(frag->newpos, frag->oldpos); SWAP(frag->newlines, frag->oldlines); } } } static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"; static const char minuses[]= "----------------------------------------------------------------------"; static void show_stats(struct apply_state *state, struct patch *patch) { struct strbuf qname = STRBUF_INIT; char *cp = patch->new_name ? patch->new_name : patch->old_name; int max, add, del; quote_c_style(cp, &qname, NULL, 0); /* * "scale" the filename */ max = state->max_len; if (max > 50) max = 50; if (qname.len > max) { cp = strchr(qname.buf + qname.len + 3 - max, '/'); if (!cp) cp = qname.buf + qname.len + 3 - max; strbuf_splice(&qname, 0, cp - qname.buf, "...", 3); } if (patch->is_binary) { printf(" %-*s | Bin\n", max, qname.buf); strbuf_release(&qname); return; } printf(" %-*s |", max, qname.buf); strbuf_release(&qname); /* * scale the add/delete */ max = max + state->max_change > 70 ? 70 - max : state->max_change; add = patch->lines_added; del = patch->lines_deleted; if (state->max_change > 0) { int total = ((add + del) * max + state->max_change / 2) / state->max_change; add = (add * max + state->max_change / 2) / state->max_change; del = total - add; } printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted, add, pluses, del, minuses); } static int read_old_data(struct stat *st, const char *path, struct strbuf *buf) { switch (st->st_mode & S_IFMT) { case S_IFLNK: if (strbuf_readlink(buf, path, st->st_size) < 0) return error(_("unable to read symlink %s"), path); return 0; case S_IFREG: if (strbuf_read_file(buf, path, st->st_size) != st->st_size) return error(_("unable to open or read %s"), path); convert_to_git(path, buf->buf, buf->len, buf, 0); return 0; default: return -1; } } /* * Update the preimage, and the common lines in postimage, * from buffer buf of length len. If postlen is 0 the postimage * is updated in place, otherwise it's updated on a new buffer * of length postlen */ static void update_pre_post_images(struct image *preimage, struct image *postimage, char *buf, size_t len, size_t postlen) { int i, ctx, reduced; char *new, *old, *fixed; struct image fixed_preimage; /* * Update the preimage with whitespace fixes. Note that we * are not losing preimage->buf -- apply_one_fragment() will * free "oldlines". */ prepare_image(&fixed_preimage, buf, len, 1); assert(postlen ? fixed_preimage.nr == preimage->nr : fixed_preimage.nr <= preimage->nr); for (i = 0; i < fixed_preimage.nr; i++) fixed_preimage.line[i].flag = preimage->line[i].flag; free(preimage->line_allocated); *preimage = fixed_preimage; /* * Adjust the common context lines in postimage. This can be * done in-place when we are shrinking it with whitespace * fixing, but needs a new buffer when ignoring whitespace or * expanding leading tabs to spaces. * * We trust the caller to tell us if the update can be done * in place (postlen==0) or not. */ old = postimage->buf; if (postlen) new = postimage->buf = xmalloc(postlen); else new = old; fixed = preimage->buf; for (i = reduced = ctx = 0; i < postimage->nr; i++) { size_t l_len = postimage->line[i].len; if (!(postimage->line[i].flag & LINE_COMMON)) { /* an added line -- no counterparts in preimage */ memmove(new, old, l_len); old += l_len; new += l_len; continue; } /* a common context -- skip it in the original postimage */ old += l_len; /* and find the corresponding one in the fixed preimage */ while (ctx < preimage->nr && !(preimage->line[ctx].flag & LINE_COMMON)) { fixed += preimage->line[ctx].len; ctx++; } /* * preimage is expected to run out, if the caller * fixed addition of trailing blank lines. */ if (preimage->nr <= ctx) { reduced++; continue; } /* and copy it in, while fixing the line length */ l_len = preimage->line[ctx].len; memcpy(new, fixed, l_len); new += l_len; fixed += l_len; postimage->line[i].len = l_len; ctx++; } if (postlen ? postlen < new - postimage->buf : postimage->len < new - postimage->buf) die("BUG: caller miscounted postlen: asked %d, orig = %d, used = %d", (int)postlen, (int) postimage->len, (int)(new - postimage->buf)); /* Fix the length of the whole thing */ postimage->len = new - postimage->buf; postimage->nr -= reduced; } static int line_by_line_fuzzy_match(struct image *img, struct image *preimage, struct image *postimage, unsigned long try, int try_lno, int preimage_limit) { int i; size_t imgoff = 0; size_t preoff = 0; size_t postlen = postimage->len; size_t extra_chars; char *buf; char *preimage_eof; char *preimage_end; struct strbuf fixed; char *fixed_buf; size_t fixed_len; for (i = 0; i < preimage_limit; i++) { size_t prelen = preimage->line[i].len; size_t imglen = img->line[try_lno+i].len; if (!fuzzy_matchlines(img->buf + try + imgoff, imglen, preimage->buf + preoff, prelen)) return 0; if (preimage->line[i].flag & LINE_COMMON) postlen += imglen - prelen; imgoff += imglen; preoff += prelen; } /* * Ok, the preimage matches with whitespace fuzz. * * imgoff now holds the true length of the target that * matches the preimage before the end of the file. * * Count the number of characters in the preimage that fall * beyond the end of the file and make sure that all of them * are whitespace characters. (This can only happen if * we are removing blank lines at the end of the file.) */ buf = preimage_eof = preimage->buf + preoff; for ( ; i < preimage->nr; i++) preoff += preimage->line[i].len; preimage_end = preimage->buf + preoff; for ( ; buf < preimage_end; buf++) if (!isspace(*buf)) return 0; /* * Update the preimage and the common postimage context * lines to use the same whitespace as the target. * If whitespace is missing in the target (i.e. * if the preimage extends beyond the end of the file), * use the whitespace from the preimage. */ extra_chars = preimage_end - preimage_eof; strbuf_init(&fixed, imgoff + extra_chars); strbuf_add(&fixed, img->buf + try, imgoff); strbuf_add(&fixed, preimage_eof, extra_chars); fixed_buf = strbuf_detach(&fixed, &fixed_len); update_pre_post_images(preimage, postimage, fixed_buf, fixed_len, postlen); return 1; } static int match_fragment(struct apply_state *state, struct image *img, struct image *preimage, struct image *postimage, unsigned long try, int try_lno, unsigned ws_rule, int match_beginning, int match_end) { int i; char *fixed_buf, *buf, *orig, *target; struct strbuf fixed; size_t fixed_len, postlen; int preimage_limit; if (preimage->nr + try_lno <= img->nr) { /* * The hunk falls within the boundaries of img. */ preimage_limit = preimage->nr; if (match_end && (preimage->nr + try_lno != img->nr)) return 0; } else if (state->ws_error_action == correct_ws_error && (ws_rule & WS_BLANK_AT_EOF)) { /* * This hunk extends beyond the end of img, and we are * removing blank lines at the end of the file. This * many lines from the beginning of the preimage must * match with img, and the remainder of the preimage * must be blank. */ preimage_limit = img->nr - try_lno; } else { /* * The hunk extends beyond the end of the img and * we are not removing blanks at the end, so we * should reject the hunk at this position. */ return 0; } if (match_beginning && try_lno) return 0; /* Quick hash check */ for (i = 0; i < preimage_limit; i++) if ((img->line[try_lno + i].flag & LINE_PATCHED) || (preimage->line[i].hash != img->line[try_lno + i].hash)) return 0; if (preimage_limit == preimage->nr) { /* * Do we have an exact match? If we were told to match * at the end, size must be exactly at try+fragsize, * otherwise try+fragsize must be still within the preimage, * and either case, the old piece should match the preimage * exactly. */ if ((match_end ? (try + preimage->len == img->len) : (try + preimage->len <= img->len)) && !memcmp(img->buf + try, preimage->buf, preimage->len)) return 1; } else { /* * The preimage extends beyond the end of img, so * there cannot be an exact match. * * There must be one non-blank context line that match * a line before the end of img. */ char *buf_end; buf = preimage->buf; buf_end = buf; for (i = 0; i < preimage_limit; i++) buf_end += preimage->line[i].len; for ( ; buf < buf_end; buf++) if (!isspace(*buf)) break; if (buf == buf_end) return 0; } /* * No exact match. If we are ignoring whitespace, run a line-by-line * fuzzy matching. We collect all the line length information because * we need it to adjust whitespace if we match. */ if (state->ws_ignore_action == ignore_ws_change) return line_by_line_fuzzy_match(img, preimage, postimage, try, try_lno, preimage_limit); if (state->ws_error_action != correct_ws_error) return 0; /* * The hunk does not apply byte-by-byte, but the hash says * it might with whitespace fuzz. We weren't asked to * ignore whitespace, we were asked to correct whitespace * errors, so let's try matching after whitespace correction. * * While checking the preimage against the target, whitespace * errors in both fixed, we count how large the corresponding * postimage needs to be. The postimage prepared by * apply_one_fragment() has whitespace errors fixed on added * lines already, but the common lines were propagated as-is, * which may become longer when their whitespace errors are * fixed. */ /* First count added lines in postimage */ postlen = 0; for (i = 0; i < postimage->nr; i++) { if (!(postimage->line[i].flag & LINE_COMMON)) postlen += postimage->line[i].len; } /* * The preimage may extend beyond the end of the file, * but in this loop we will only handle the part of the * preimage that falls within the file. */ strbuf_init(&fixed, preimage->len + 1); orig = preimage->buf; target = img->buf + try; for (i = 0; i < preimage_limit; i++) { size_t oldlen = preimage->line[i].len; size_t tgtlen = img->line[try_lno + i].len; size_t fixstart = fixed.len; struct strbuf tgtfix; int match; /* Try fixing the line in the preimage */ ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL); /* Try fixing the line in the target */ strbuf_init(&tgtfix, tgtlen); ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL); /* * If they match, either the preimage was based on * a version before our tree fixed whitespace breakage, * or we are lacking a whitespace-fix patch the tree * the preimage was based on already had (i.e. target * has whitespace breakage, the preimage doesn't). * In either case, we are fixing the whitespace breakages * so we might as well take the fix together with their * real change. */ match = (tgtfix.len == fixed.len - fixstart && !memcmp(tgtfix.buf, fixed.buf + fixstart, fixed.len - fixstart)); /* Add the length if this is common with the postimage */ if (preimage->line[i].flag & LINE_COMMON) postlen += tgtfix.len; strbuf_release(&tgtfix); if (!match) goto unmatch_exit; orig += oldlen; target += tgtlen; } /* * Now handle the lines in the preimage that falls beyond the * end of the file (if any). They will only match if they are * empty or only contain whitespace (if WS_BLANK_AT_EOL is * false). */ for ( ; i < preimage->nr; i++) { size_t fixstart = fixed.len; /* start of the fixed preimage */ size_t oldlen = preimage->line[i].len; int j; /* Try fixing the line in the preimage */ ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL); for (j = fixstart; j < fixed.len; j++) if (!isspace(fixed.buf[j])) goto unmatch_exit; orig += oldlen; } /* * Yes, the preimage is based on an older version that still * has whitespace breakages unfixed, and fixing them makes the * hunk match. Update the context lines in the postimage. */ fixed_buf = strbuf_detach(&fixed, &fixed_len); if (postlen < postimage->len) postlen = 0; update_pre_post_images(preimage, postimage, fixed_buf, fixed_len, postlen); return 1; unmatch_exit: strbuf_release(&fixed); return 0; } static int find_pos(struct apply_state *state, struct image *img, struct image *preimage, struct image *postimage, int line, unsigned ws_rule, int match_beginning, int match_end) { int i; unsigned long backwards, forwards, try; int backwards_lno, forwards_lno, try_lno; /* * If match_beginning or match_end is specified, there is no * point starting from a wrong line that will never match and * wander around and wait for a match at the specified end. */ if (match_beginning) line = 0; else if (match_end) line = img->nr - preimage->nr; /* * Because the comparison is unsigned, the following test * will also take care of a negative line number that can * result when match_end and preimage is larger than the target. */ if ((size_t) line > img->nr) line = img->nr; try = 0; for (i = 0; i < line; i++) try += img->line[i].len; /* * There's probably some smart way to do this, but I'll leave * that to the smart and beautiful people. I'm simple and stupid. */ backwards = try; backwards_lno = line; forwards = try; forwards_lno = line; try_lno = line; for (i = 0; ; i++) { if (match_fragment(state, img, preimage, postimage, try, try_lno, ws_rule, match_beginning, match_end)) return try_lno; again: if (backwards_lno == 0 && forwards_lno == img->nr) break; if (i & 1) { if (backwards_lno == 0) { i++; goto again; } backwards_lno--; backwards -= img->line[backwards_lno].len; try = backwards; try_lno = backwards_lno; } else { if (forwards_lno == img->nr) { i++; goto again; } forwards += img->line[forwards_lno].len; forwards_lno++; try = forwards; try_lno = forwards_lno; } } return -1; } static void remove_first_line(struct image *img) { img->buf += img->line[0].len; img->len -= img->line[0].len; img->line++; img->nr--; } static void remove_last_line(struct image *img) { img->len -= img->line[--img->nr].len; } /* * The change from "preimage" and "postimage" has been found to * apply at applied_pos (counts in line numbers) in "img". * Update "img" to remove "preimage" and replace it with "postimage". */ static void update_image(struct apply_state *state, struct image *img, int applied_pos, struct image *preimage, struct image *postimage) { /* * remove the copy of preimage at offset in img * and replace it with postimage */ int i, nr; size_t remove_count, insert_count, applied_at = 0; char *result; int preimage_limit; /* * If we are removing blank lines at the end of img, * the preimage may extend beyond the end. * If that is the case, we must be careful only to * remove the part of the preimage that falls within * the boundaries of img. Initialize preimage_limit * to the number of lines in the preimage that falls * within the boundaries. */ preimage_limit = preimage->nr; if (preimage_limit > img->nr - applied_pos) preimage_limit = img->nr - applied_pos; for (i = 0; i < applied_pos; i++) applied_at += img->line[i].len; remove_count = 0; for (i = 0; i < preimage_limit; i++) remove_count += img->line[applied_pos + i].len; insert_count = postimage->len; /* Adjust the contents */ result = xmalloc(st_add3(st_sub(img->len, remove_count), insert_count, 1)); memcpy(result, img->buf, applied_at); memcpy(result + applied_at, postimage->buf, postimage->len); memcpy(result + applied_at + postimage->len, img->buf + (applied_at + remove_count), img->len - (applied_at + remove_count)); free(img->buf); img->buf = result; img->len += insert_count - remove_count; result[img->len] = '\0'; /* Adjust the line table */ nr = img->nr + postimage->nr - preimage_limit; if (preimage_limit < postimage->nr) { /* * NOTE: this knows that we never call remove_first_line() * on anything other than pre/post image. */ REALLOC_ARRAY(img->line, nr); img->line_allocated = img->line; } if (preimage_limit != postimage->nr) memmove(img->line + applied_pos + postimage->nr, img->line + applied_pos + preimage_limit, (img->nr - (applied_pos + preimage_limit)) * sizeof(*img->line)); memcpy(img->line + applied_pos, postimage->line, postimage->nr * sizeof(*img->line)); if (!state->allow_overlap) for (i = 0; i < postimage->nr; i++) img->line[applied_pos + i].flag |= LINE_PATCHED; img->nr = nr; } /* * Use the patch-hunk text in "frag" to prepare two images (preimage and * postimage) for the hunk. Find lines that match "preimage" in "img" and * replace the part of "img" with "postimage" text. */ static int apply_one_fragment(struct apply_state *state, struct image *img, struct fragment *frag, int inaccurate_eof, unsigned ws_rule, int nth_fragment) { int match_beginning, match_end; const char *patch = frag->patch; int size = frag->size; char *old, *oldlines; struct strbuf newlines; int new_blank_lines_at_end = 0; int found_new_blank_lines_at_end = 0; int hunk_linenr = frag->linenr; unsigned long leading, trailing; int pos, applied_pos; struct image preimage; struct image postimage; memset(&preimage, 0, sizeof(preimage)); memset(&postimage, 0, sizeof(postimage)); oldlines = xmalloc(size); strbuf_init(&newlines, size); old = oldlines; while (size > 0) { char first; int len = linelen(patch, size); int plen; int added_blank_line = 0; int is_blank_context = 0; size_t start; if (!len) break; /* * "plen" is how much of the line we should use for * the actual patch data. Normally we just remove the * first character on the line, but if the line is * followed by "\ No newline", then we also remove the * last one (which is the newline, of course). */ plen = len - 1; if (len < size && patch[len] == '\\') plen--; first = *patch; if (state->apply_in_reverse) { if (first == '-') first = '+'; else if (first == '+') first = '-'; } switch (first) { case '\n': /* Newer GNU diff, empty context line */ if (plen < 0) /* ... followed by '\No newline'; nothing */ break; *old++ = '\n'; strbuf_addch(&newlines, '\n'); add_line_info(&preimage, "\n", 1, LINE_COMMON); add_line_info(&postimage, "\n", 1, LINE_COMMON); is_blank_context = 1; break; case ' ': if (plen && (ws_rule & WS_BLANK_AT_EOF) && ws_blank_line(patch + 1, plen, ws_rule)) is_blank_context = 1; case '-': memcpy(old, patch + 1, plen); add_line_info(&preimage, old, plen, (first == ' ' ? LINE_COMMON : 0)); old += plen; if (first == '-') break; /* Fall-through for ' ' */ case '+': /* --no-add does not add new lines */ if (first == '+' && state->no_add) break; start = newlines.len; if (first != '+' || !state->whitespace_error || state->ws_error_action != correct_ws_error) { strbuf_add(&newlines, patch + 1, plen); } else { ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &state->applied_after_fixing_ws); } add_line_info(&postimage, newlines.buf + start, newlines.len - start, (first == '+' ? 0 : LINE_COMMON)); if (first == '+' && (ws_rule & WS_BLANK_AT_EOF) && ws_blank_line(patch + 1, plen, ws_rule)) added_blank_line = 1; break; case '@': case '\\': /* Ignore it, we already handled it */ break; default: if (state->apply_verbosity > verbosity_normal) error(_("invalid start of line: '%c'"), first); applied_pos = -1; goto out; } if (added_blank_line) { if (!new_blank_lines_at_end) found_new_blank_lines_at_end = hunk_linenr; new_blank_lines_at_end++; } else if (is_blank_context) ; else new_blank_lines_at_end = 0; patch += len; size -= len; hunk_linenr++; } if (inaccurate_eof && old > oldlines && old[-1] == '\n' && newlines.len > 0 && newlines.buf[newlines.len - 1] == '\n') { old--; strbuf_setlen(&newlines, newlines.len - 1); } leading = frag->leading; trailing = frag->trailing; /* * A hunk to change lines at the beginning would begin with * @@ -1,L +N,M @@ * but we need to be careful. -U0 that inserts before the second * line also has this pattern. * * And a hunk to add to an empty file would begin with * @@ -0,0 +N,M @@ * * In other words, a hunk that is (frag->oldpos <= 1) with or * without leading context must match at the beginning. */ match_beginning = (!frag->oldpos || (frag->oldpos == 1 && !state->unidiff_zero)); /* * A hunk without trailing lines must match at the end. * However, we simply cannot tell if a hunk must match end * from the lack of trailing lines if the patch was generated * with unidiff without any context. */ match_end = !state->unidiff_zero && !trailing; pos = frag->newpos ? (frag->newpos - 1) : 0; preimage.buf = oldlines; preimage.len = old - oldlines; postimage.buf = newlines.buf; postimage.len = newlines.len; preimage.line = preimage.line_allocated; postimage.line = postimage.line_allocated; for (;;) { applied_pos = find_pos(state, img, &preimage, &postimage, pos, ws_rule, match_beginning, match_end); if (applied_pos >= 0) break; /* Am I at my context limits? */ if ((leading <= state->p_context) && (trailing <= state->p_context)) break; if (match_beginning || match_end) { match_beginning = match_end = 0; continue; } /* * Reduce the number of context lines; reduce both * leading and trailing if they are equal otherwise * just reduce the larger context. */ if (leading >= trailing) { remove_first_line(&preimage); remove_first_line(&postimage); pos--; leading--; } if (trailing > leading) { remove_last_line(&preimage); remove_last_line(&postimage); trailing--; } } if (applied_pos >= 0) { if (new_blank_lines_at_end && preimage.nr + applied_pos >= img->nr && (ws_rule & WS_BLANK_AT_EOF) && state->ws_error_action != nowarn_ws_error) { record_ws_error(state, WS_BLANK_AT_EOF, "+", 1, found_new_blank_lines_at_end); if (state->ws_error_action == correct_ws_error) { while (new_blank_lines_at_end--) remove_last_line(&postimage); } /* * We would want to prevent write_out_results() * from taking place in apply_patch() that follows * the callchain led us here, which is: * apply_patch->check_patch_list->check_patch-> * apply_data->apply_fragments->apply_one_fragment */ if (state->ws_error_action == die_on_ws_error) state->apply = 0; } if (state->apply_verbosity > verbosity_normal && applied_pos != pos) { int offset = applied_pos - pos; if (state->apply_in_reverse) offset = 0 - offset; fprintf_ln(stderr, Q_("Hunk #%d succeeded at %d (offset %d line).", "Hunk #%d succeeded at %d (offset %d lines).", offset), nth_fragment, applied_pos + 1, offset); } /* * Warn if it was necessary to reduce the number * of context lines. */ if ((leading != frag->leading || trailing != frag->trailing) && state->apply_verbosity > verbosity_silent) fprintf_ln(stderr, _("Context reduced to (%ld/%ld)" " to apply fragment at %d"), leading, trailing, applied_pos+1); update_image(state, img, applied_pos, &preimage, &postimage); } else { if (state->apply_verbosity > verbosity_normal) error(_("while searching for:\n%.*s"), (int)(old - oldlines), oldlines); } out: free(oldlines); strbuf_release(&newlines); free(preimage.line_allocated); free(postimage.line_allocated); return (applied_pos < 0); } static int apply_binary_fragment(struct apply_state *state, struct image *img, struct patch *patch) { struct fragment *fragment = patch->fragments; unsigned long len; void *dst; if (!fragment) return error(_("missing binary patch data for '%s'"), patch->new_name ? patch->new_name : patch->old_name); /* Binary patch is irreversible without the optional second hunk */ if (state->apply_in_reverse) { if (!fragment->next) return error(_("cannot reverse-apply a binary patch " "without the reverse hunk to '%s'"), patch->new_name ? patch->new_name : patch->old_name); fragment = fragment->next; } switch (fragment->binary_patch_method) { case BINARY_DELTA_DEFLATED: dst = patch_delta(img->buf, img->len, fragment->patch, fragment->size, &len); if (!dst) return -1; clear_image(img); img->buf = dst; img->len = len; return 0; case BINARY_LITERAL_DEFLATED: clear_image(img); img->len = fragment->size; img->buf = xmemdupz(fragment->patch, img->len); return 0; } return -1; } /* * Replace "img" with the result of applying the binary patch. * The binary patch data itself in patch->fragment is still kept * but the preimage prepared by the caller in "img" is freed here * or in the helper function apply_binary_fragment() this calls. */ static int apply_binary(struct apply_state *state, struct image *img, struct patch *patch) { const char *name = patch->old_name ? patch->old_name : patch->new_name; struct object_id oid; /* * For safety, we require patch index line to contain * full 40-byte textual SHA1 for old and new, at least for now. */ if (strlen(patch->old_sha1_prefix) != 40 || strlen(patch->new_sha1_prefix) != 40 || get_oid_hex(patch->old_sha1_prefix, &oid) || get_oid_hex(patch->new_sha1_prefix, &oid)) return error(_("cannot apply binary patch to '%s' " "without full index line"), name); if (patch->old_name) { /* * See if the old one matches what the patch * applies to. */ hash_sha1_file(img->buf, img->len, blob_type, oid.hash); if (strcmp(oid_to_hex(&oid), patch->old_sha1_prefix)) return error(_("the patch applies to '%s' (%s), " "which does not match the " "current contents."), name, oid_to_hex(&oid)); } else { /* Otherwise, the old one must be empty. */ if (img->len) return error(_("the patch applies to an empty " "'%s' but it is not empty"), name); } get_oid_hex(patch->new_sha1_prefix, &oid); if (is_null_oid(&oid)) { clear_image(img); return 0; /* deletion patch */ } if (has_sha1_file(oid.hash)) { /* We already have the postimage */ enum object_type type; unsigned long size; char *result; result = read_sha1_file(oid.hash, &type, &size); if (!result) return error(_("the necessary postimage %s for " "'%s' cannot be read"), patch->new_sha1_prefix, name); clear_image(img); img->buf = result; img->len = size; } else { /* * We have verified buf matches the preimage; * apply the patch data to it, which is stored * in the patch->fragments->{patch,size}. */ if (apply_binary_fragment(state, img, patch)) return error(_("binary patch does not apply to '%s'"), name); /* verify that the result matches */ hash_sha1_file(img->buf, img->len, blob_type, oid.hash); if (strcmp(oid_to_hex(&oid), patch->new_sha1_prefix)) return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"), name, patch->new_sha1_prefix, oid_to_hex(&oid)); } return 0; } static int apply_fragments(struct apply_state *state, struct image *img, struct patch *patch) { struct fragment *frag = patch->fragments; const char *name = patch->old_name ? patch->old_name : patch->new_name; unsigned ws_rule = patch->ws_rule; unsigned inaccurate_eof = patch->inaccurate_eof; int nth = 0; if (patch->is_binary) return apply_binary(state, img, patch); while (frag) { nth++; if (apply_one_fragment(state, img, frag, inaccurate_eof, ws_rule, nth)) { error(_("patch failed: %s:%ld"), name, frag->oldpos); if (!state->apply_with_reject) return -1; frag->rejected = 1; } frag = frag->next; } return 0; } static int read_blob_object(struct strbuf *buf, const struct object_id *oid, unsigned mode) { if (S_ISGITLINK(mode)) { strbuf_grow(buf, 100); strbuf_addf(buf, "Subproject commit %s\n", oid_to_hex(oid)); } else { enum object_type type; unsigned long sz; char *result; result = read_sha1_file(oid->hash, &type, &sz); if (!result) return -1; /* XXX read_sha1_file NUL-terminates */ strbuf_attach(buf, result, sz, sz + 1); } return 0; } static int read_file_or_gitlink(const struct cache_entry *ce, struct strbuf *buf) { if (!ce) return 0; return read_blob_object(buf, &ce->oid, ce->ce_mode); } static struct patch *in_fn_table(struct apply_state *state, const char *name) { struct string_list_item *item; if (name == NULL) return NULL; item = string_list_lookup(&state->fn_table, name); if (item != NULL) return (struct patch *)item->util; return NULL; } /* * item->util in the filename table records the status of the path. * Usually it points at a patch (whose result records the contents * of it after applying it), but it could be PATH_WAS_DELETED for a * path that a previously applied patch has already removed, or * PATH_TO_BE_DELETED for a path that a later patch would remove. * * The latter is needed to deal with a case where two paths A and B * are swapped by first renaming A to B and then renaming B to A; * moving A to B should not be prevented due to presence of B as we * will remove it in a later patch. */ #define PATH_TO_BE_DELETED ((struct patch *) -2) #define PATH_WAS_DELETED ((struct patch *) -1) static int to_be_deleted(struct patch *patch) { return patch == PATH_TO_BE_DELETED; } static int was_deleted(struct patch *patch) { return patch == PATH_WAS_DELETED; } static void add_to_fn_table(struct apply_state *state, struct patch *patch) { struct string_list_item *item; /* * Always add new_name unless patch is a deletion * This should cover the cases for normal diffs, * file creations and copies */ if (patch->new_name != NULL) { item = string_list_insert(&state->fn_table, patch->new_name); item->util = patch; } /* * store a failure on rename/deletion cases because * later chunks shouldn't patch old names */ if ((patch->new_name == NULL) || (patch->is_rename)) { item = string_list_insert(&state->fn_table, patch->old_name); item->util = PATH_WAS_DELETED; } } static void prepare_fn_table(struct apply_state *state, struct patch *patch) { /* * store information about incoming file deletion */ while (patch) { if ((patch->new_name == NULL) || (patch->is_rename)) { struct string_list_item *item; item = string_list_insert(&state->fn_table, patch->old_name); item->util = PATH_TO_BE_DELETED; } patch = patch->next; } } static int checkout_target(struct index_state *istate, struct cache_entry *ce, struct stat *st) { struct checkout costate = CHECKOUT_INIT; costate.refresh_cache = 1; costate.istate = istate; if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st)) return error(_("cannot checkout %s"), ce->name); return 0; } static struct patch *previous_patch(struct apply_state *state, struct patch *patch, int *gone) { struct patch *previous; *gone = 0; if (patch->is_copy || patch->is_rename) return NULL; /* "git" patches do not depend on the order */ previous = in_fn_table(state, patch->old_name); if (!previous) return NULL; if (to_be_deleted(previous)) return NULL; /* the deletion hasn't happened yet */ if (was_deleted(previous)) *gone = 1; return previous; } static int verify_index_match(const struct cache_entry *ce, struct stat *st) { if (S_ISGITLINK(ce->ce_mode)) { if (!S_ISDIR(st->st_mode)) return -1; return 0; } return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); } #define SUBMODULE_PATCH_WITHOUT_INDEX 1 static int load_patch_target(struct apply_state *state, struct strbuf *buf, const struct cache_entry *ce, struct stat *st, const char *name, unsigned expected_mode) { if (state->cached || state->check_index) { if (read_file_or_gitlink(ce, buf)) return error(_("failed to read %s"), name); } else if (name) { if (S_ISGITLINK(expected_mode)) { if (ce) return read_file_or_gitlink(ce, buf); else return SUBMODULE_PATCH_WITHOUT_INDEX; } else if (has_symlink_leading_path(name, strlen(name))) { return error(_("reading from '%s' beyond a symbolic link"), name); } else { if (read_old_data(st, name, buf)) return error(_("failed to read %s"), name); } } return 0; } /* * We are about to apply "patch"; populate the "image" with the * current version we have, from the working tree or from the index, * depending on the situation e.g. --cached/--index. If we are * applying a non-git patch that incrementally updates the tree, * we read from the result of a previous diff. */ static int load_preimage(struct apply_state *state, struct image *image, struct patch *patch, struct stat *st, const struct cache_entry *ce) { struct strbuf buf = STRBUF_INIT; size_t len; char *img; struct patch *previous; int status; previous = previous_patch(state, patch, &status); if (status) return error(_("path %s has been renamed/deleted"), patch->old_name); if (previous) { /* We have a patched copy in memory; use that. */ strbuf_add(&buf, previous->result, previous->resultsize); } else { status = load_patch_target(state, &buf, ce, st, patch->old_name, patch->old_mode); if (status < 0) return status; else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) { /* * There is no way to apply subproject * patch without looking at the index. * NEEDSWORK: shouldn't this be flagged * as an error??? */ free_fragment_list(patch->fragments); patch->fragments = NULL; } else if (status) { return error(_("failed to read %s"), patch->old_name); } } img = strbuf_detach(&buf, &len); prepare_image(image, img, len, !patch->is_binary); return 0; } static int three_way_merge(struct image *image, char *path, const struct object_id *base, const struct object_id *ours, const struct object_id *theirs) { mmfile_t base_file, our_file, their_file; mmbuffer_t result = { NULL }; int status; read_mmblob(&base_file, base); read_mmblob(&our_file, ours); read_mmblob(&their_file, theirs); status = ll_merge(&result, path, &base_file, "base", &our_file, "ours", &their_file, "theirs", NULL); free(base_file.ptr); free(our_file.ptr); free(their_file.ptr); if (status < 0 || !result.ptr) { free(result.ptr); return -1; } clear_image(image); image->buf = result.ptr; image->len = result.size; return status; } /* * When directly falling back to add/add three-way merge, we read from * the current contents of the new_name. In no cases other than that * this function will be called. */ static int load_current(struct apply_state *state, struct image *image, struct patch *patch) { struct strbuf buf = STRBUF_INIT; int status, pos; size_t len; char *img; struct stat st; struct cache_entry *ce; char *name = patch->new_name; unsigned mode = patch->new_mode; if (!patch->is_new) die("BUG: patch to %s is not a creation", patch->old_name); pos = cache_name_pos(name, strlen(name)); if (pos < 0) return error(_("%s: does not exist in index"), name); ce = active_cache[pos]; if (lstat(name, &st)) { if (errno != ENOENT) return error_errno("%s", name); if (checkout_target(&the_index, ce, &st)) return -1; } if (verify_index_match(ce, &st)) return error(_("%s: does not match index"), name); status = load_patch_target(state, &buf, ce, &st, name, mode); if (status < 0) return status; else if (status) return -1; img = strbuf_detach(&buf, &len); prepare_image(image, img, len, !patch->is_binary); return 0; } static int try_threeway(struct apply_state *state, struct image *image, struct patch *patch, struct stat *st, const struct cache_entry *ce) { struct object_id pre_oid, post_oid, our_oid; struct strbuf buf = STRBUF_INIT; size_t len; int status; char *img; struct image tmp_image; /* No point falling back to 3-way merge in these cases */ if (patch->is_delete || S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode)) return -1; /* Preimage the patch was prepared for */ if (patch->is_new) write_sha1_file("", 0, blob_type, pre_oid.hash); else if (get_sha1(patch->old_sha1_prefix, pre_oid.hash) || read_blob_object(&buf, &pre_oid, patch->old_mode)) return error(_("repository lacks the necessary blob to fall back on 3-way merge.")); if (state->apply_verbosity > verbosity_silent) fprintf(stderr, _("Falling back to three-way merge...\n")); img = strbuf_detach(&buf, &len); prepare_image(&tmp_image, img, len, 1); /* Apply the patch to get the post image */ if (apply_fragments(state, &tmp_image, patch) < 0) { clear_image(&tmp_image); return -1; } /* post_oid is theirs */ write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_oid.hash); clear_image(&tmp_image); /* our_oid is ours */ if (patch->is_new) { if (load_current(state, &tmp_image, patch)) return error(_("cannot read the current contents of '%s'"), patch->new_name); } else { if (load_preimage(state, &tmp_image, patch, st, ce)) return error(_("cannot read the current contents of '%s'"), patch->old_name); } write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_oid.hash); clear_image(&tmp_image); /* in-core three-way merge between post and our using pre as base */ status = three_way_merge(image, patch->new_name, &pre_oid, &our_oid, &post_oid); if (status < 0) { if (state->apply_verbosity > verbosity_silent) fprintf(stderr, _("Failed to fall back on three-way merge...\n")); return status; } if (status) { patch->conflicted_threeway = 1; if (patch->is_new) oidclr(&patch->threeway_stage[0]); else oidcpy(&patch->threeway_stage[0], &pre_oid); oidcpy(&patch->threeway_stage[1], &our_oid); oidcpy(&patch->threeway_stage[2], &post_oid); if (state->apply_verbosity > verbosity_silent) fprintf(stderr, _("Applied patch to '%s' with conflicts.\n"), patch->new_name); } else { if (state->apply_verbosity > verbosity_silent) fprintf(stderr, _("Applied patch to '%s' cleanly.\n"), patch->new_name); } return 0; } static int apply_data(struct apply_state *state, struct patch *patch, struct stat *st, const struct cache_entry *ce) { struct image image; if (load_preimage(state, &image, patch, st, ce) < 0) return -1; if (patch->direct_to_threeway || apply_fragments(state, &image, patch) < 0) { /* Note: with --reject, apply_fragments() returns 0 */ if (!state->threeway || try_threeway(state, &image, patch, st, ce) < 0) return -1; } patch->result = image.buf; patch->resultsize = image.len; add_to_fn_table(state, patch); free(image.line_allocated); if (0 < patch->is_delete && patch->resultsize) return error(_("removal patch leaves file contents")); return 0; } /* * If "patch" that we are looking at modifies or deletes what we have, * we would want it not to lose any local modification we have, either * in the working tree or in the index. * * This also decides if a non-git patch is a creation patch or a * modification to an existing empty file. We do not check the state * of the current tree for a creation patch in this function; the caller * check_patch() separately makes sure (and errors out otherwise) that * the path the patch creates does not exist in the current tree. */ static int check_preimage(struct apply_state *state, struct patch *patch, struct cache_entry **ce, struct stat *st) { const char *old_name = patch->old_name; struct patch *previous = NULL; int stat_ret = 0, status; unsigned st_mode = 0; if (!old_name) return 0; assert(patch->is_new <= 0); previous = previous_patch(state, patch, &status); if (status) return error(_("path %s has been renamed/deleted"), old_name); if (previous) { st_mode = previous->new_mode; } else if (!state->cached) { stat_ret = lstat(old_name, st); if (stat_ret && errno != ENOENT) return error_errno("%s", old_name); } if (state->check_index && !previous) { int pos = cache_name_pos(old_name, strlen(old_name)); if (pos < 0) { if (patch->is_new < 0) goto is_new; return error(_("%s: does not exist in index"), old_name); } *ce = active_cache[pos]; if (stat_ret < 0) { if (checkout_target(&the_index, *ce, st)) return -1; } if (!state->cached && verify_index_match(*ce, st)) return error(_("%s: does not match index"), old_name); if (state->cached) st_mode = (*ce)->ce_mode; } else if (stat_ret < 0) { if (patch->is_new < 0) goto is_new; return error_errno("%s", old_name); } if (!state->cached && !previous) st_mode = ce_mode_from_stat(*ce, st->st_mode); if (patch->is_new < 0) patch->is_new = 0; if (!patch->old_mode) patch->old_mode = st_mode; if ((st_mode ^ patch->old_mode) & S_IFMT) return error(_("%s: wrong type"), old_name); if (st_mode != patch->old_mode) warning(_("%s has type %o, expected %o"), old_name, st_mode, patch->old_mode); if (!patch->new_mode && !patch->is_delete) patch->new_mode = st_mode; return 0; is_new: patch->is_new = 1; patch->is_delete = 0; free(patch->old_name); patch->old_name = NULL; return 0; } #define EXISTS_IN_INDEX 1 #define EXISTS_IN_WORKTREE 2 static int check_to_create(struct apply_state *state, const char *new_name, int ok_if_exists) { struct stat nst; if (state->check_index && cache_name_pos(new_name, strlen(new_name)) >= 0 && !ok_if_exists) return EXISTS_IN_INDEX; if (state->cached) return 0; if (!lstat(new_name, &nst)) { if (S_ISDIR(nst.st_mode) || ok_if_exists) return 0; /* * A leading component of new_name might be a symlink * that is going to be removed with this patch, but * still pointing at somewhere that has the path. * In such a case, path "new_name" does not exist as * far as git is concerned. */ if (has_symlink_leading_path(new_name, strlen(new_name))) return 0; return EXISTS_IN_WORKTREE; } else if ((errno != ENOENT) && (errno != ENOTDIR)) { return error_errno("%s", new_name); } return 0; } static uintptr_t register_symlink_changes(struct apply_state *state, const char *path, uintptr_t what) { struct string_list_item *ent; ent = string_list_lookup(&state->symlink_changes, path); if (!ent) { ent = string_list_insert(&state->symlink_changes, path); ent->util = (void *)0; } ent->util = (void *)(what | ((uintptr_t)ent->util)); return (uintptr_t)ent->util; } static uintptr_t check_symlink_changes(struct apply_state *state, const char *path) { struct string_list_item *ent; ent = string_list_lookup(&state->symlink_changes, path); if (!ent) return 0; return (uintptr_t)ent->util; } static void prepare_symlink_changes(struct apply_state *state, struct patch *patch) { for ( ; patch; patch = patch->next) { if ((patch->old_name && S_ISLNK(patch->old_mode)) && (patch->is_rename || patch->is_delete)) /* the symlink at patch->old_name is removed */ register_symlink_changes(state, patch->old_name, APPLY_SYMLINK_GOES_AWAY); if (patch->new_name && S_ISLNK(patch->new_mode)) /* the symlink at patch->new_name is created or remains */ register_symlink_changes(state, patch->new_name, APPLY_SYMLINK_IN_RESULT); } } static int path_is_beyond_symlink_1(struct apply_state *state, struct strbuf *name) { do { unsigned int change; while (--name->len && name->buf[name->len] != '/') ; /* scan backwards */ if (!name->len) break; name->buf[name->len] = '\0'; change = check_symlink_changes(state, name->buf); if (change & APPLY_SYMLINK_IN_RESULT) return 1; if (change & APPLY_SYMLINK_GOES_AWAY) /* * This cannot be "return 0", because we may * see a new one created at a higher level. */ continue; /* otherwise, check the preimage */ if (state->check_index) { struct cache_entry *ce; ce = cache_file_exists(name->buf, name->len, ignore_case); if (ce && S_ISLNK(ce->ce_mode)) return 1; } else { struct stat st; if (!lstat(name->buf, &st) && S_ISLNK(st.st_mode)) return 1; } } while (1); return 0; } static int path_is_beyond_symlink(struct apply_state *state, const char *name_) { int ret; struct strbuf name = STRBUF_INIT; assert(*name_ != '\0'); strbuf_addstr(&name, name_); ret = path_is_beyond_symlink_1(state, &name); strbuf_release(&name); return ret; } static int check_unsafe_path(struct patch *patch) { const char *old_name = NULL; const char *new_name = NULL; if (patch->is_delete) old_name = patch->old_name; else if (!patch->is_new && !patch->is_copy) old_name = patch->old_name; if (!patch->is_delete) new_name = patch->new_name; if (old_name && !verify_path(old_name, patch->old_mode)) return error(_("invalid path '%s'"), old_name); if (new_name && !verify_path(new_name, patch->new_mode)) return error(_("invalid path '%s'"), new_name); return 0; } /* * Check and apply the patch in-core; leave the result in patch->result * for the caller to write it out to the final destination. */ static int check_patch(struct apply_state *state, struct patch *patch) { struct stat st; const char *old_name = patch->old_name; const char *new_name = patch->new_name; const char *name = old_name ? old_name : new_name; struct cache_entry *ce = NULL; struct patch *tpatch; int ok_if_exists; int status; patch->rejected = 1; /* we will drop this after we succeed */ status = check_preimage(state, patch, &ce, &st); if (status) return status; old_name = patch->old_name; /* * A type-change diff is always split into a patch to delete * old, immediately followed by a patch to create new (see * diff.c::run_diff()); in such a case it is Ok that the entry * to be deleted by the previous patch is still in the working * tree and in the index. * * A patch to swap-rename between A and B would first rename A * to B and then rename B to A. While applying the first one, * the presence of B should not stop A from getting renamed to * B; ask to_be_deleted() about the later rename. Removal of * B and rename from A to B is handled the same way by asking * was_deleted(). */ if ((tpatch = in_fn_table(state, new_name)) && (was_deleted(tpatch) || to_be_deleted(tpatch))) ok_if_exists = 1; else ok_if_exists = 0; if (new_name && ((0 < patch->is_new) || patch->is_rename || patch->is_copy)) { int err = check_to_create(state, new_name, ok_if_exists); if (err && state->threeway) { patch->direct_to_threeway = 1; } else switch (err) { case 0: break; /* happy */ case EXISTS_IN_INDEX: return error(_("%s: already exists in index"), new_name); break; case EXISTS_IN_WORKTREE: return error(_("%s: already exists in working directory"), new_name); default: return err; } if (!patch->new_mode) { if (0 < patch->is_new) patch->new_mode = S_IFREG | 0644; else patch->new_mode = patch->old_mode; } } if (new_name && old_name) { int same = !strcmp(old_name, new_name); if (!patch->new_mode) patch->new_mode = patch->old_mode; if ((patch->old_mode ^ patch->new_mode) & S_IFMT) { if (same) return error(_("new mode (%o) of %s does not " "match old mode (%o)"), patch->new_mode, new_name, patch->old_mode); else return error(_("new mode (%o) of %s does not " "match old mode (%o) of %s"), patch->new_mode, new_name, patch->old_mode, old_name); } } if (!state->unsafe_paths && check_unsafe_path(patch)) return -128; /* * An attempt to read from or delete a path that is beyond a * symbolic link will be prevented by load_patch_target() that * is called at the beginning of apply_data() so we do not * have to worry about a patch marked with "is_delete" bit * here. We however need to make sure that the patch result * is not deposited to a path that is beyond a symbolic link * here. */ if (!patch->is_delete && path_is_beyond_symlink(state, patch->new_name)) return error(_("affected file '%s' is beyond a symbolic link"), patch->new_name); if (apply_data(state, patch, &st, ce) < 0) return error(_("%s: patch does not apply"), name); patch->rejected = 0; return 0; } static int check_patch_list(struct apply_state *state, struct patch *patch) { int err = 0; prepare_symlink_changes(state, patch); prepare_fn_table(state, patch); while (patch) { int res; if (state->apply_verbosity > verbosity_normal) say_patch_name(stderr, _("Checking patch %s..."), patch); res = check_patch(state, patch); if (res == -128) return -128; err |= res; patch = patch->next; } return err; } static int read_apply_cache(struct apply_state *state) { if (state->index_file) return read_cache_from(state->index_file); else return read_cache(); } /* This function tries to read the object name from the current index */ static int get_current_oid(struct apply_state *state, const char *path, struct object_id *oid) { int pos; if (read_apply_cache(state) < 0) return -1; pos = cache_name_pos(path, strlen(path)); if (pos < 0) return -1; oidcpy(oid, &active_cache[pos]->oid); return 0; } static int preimage_oid_in_gitlink_patch(struct patch *p, struct object_id *oid) { /* * A usable gitlink patch has only one fragment (hunk) that looks like: * @@ -1 +1 @@ * -Subproject commit * +Subproject commit * or * @@ -1 +0,0 @@ * -Subproject commit * for a removal patch. */ struct fragment *hunk = p->fragments; static const char heading[] = "-Subproject commit "; char *preimage; if (/* does the patch have only one hunk? */ hunk && !hunk->next && /* is its preimage one line? */ hunk->oldpos == 1 && hunk->oldlines == 1 && /* does preimage begin with the heading? */ (preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL && starts_with(++preimage, heading) && /* does it record full SHA-1? */ !get_oid_hex(preimage + sizeof(heading) - 1, oid) && preimage[sizeof(heading) + GIT_SHA1_HEXSZ - 1] == '\n' && /* does the abbreviated name on the index line agree with it? */ starts_with(preimage + sizeof(heading) - 1, p->old_sha1_prefix)) return 0; /* it all looks fine */ /* we may have full object name on the index line */ return get_oid_hex(p->old_sha1_prefix, oid); } /* Build an index that contains the just the files needed for a 3way merge */ static int build_fake_ancestor(struct apply_state *state, struct patch *list) { struct patch *patch; struct index_state result = { NULL }; static struct lock_file lock; int res; /* Once we start supporting the reverse patch, it may be * worth showing the new sha1 prefix, but until then... */ for (patch = list; patch; patch = patch->next) { struct object_id oid; struct cache_entry *ce; const char *name; name = patch->old_name ? patch->old_name : patch->new_name; if (0 < patch->is_new) continue; if (S_ISGITLINK(patch->old_mode)) { if (!preimage_oid_in_gitlink_patch(patch, &oid)) ; /* ok, the textual part looks sane */ else return error(_("sha1 information is lacking or " "useless for submodule %s"), name); } else if (!get_sha1_blob(patch->old_sha1_prefix, oid.hash)) { ; /* ok */ } else if (!patch->lines_added && !patch->lines_deleted) { /* mode-only change: update the current */ if (get_current_oid(state, patch->old_name, &oid)) return error(_("mode change for %s, which is not " "in current HEAD"), name); } else return error(_("sha1 information is lacking or useless " "(%s)."), name); ce = make_cache_entry(patch->old_mode, oid.hash, name, 0, 0); if (!ce) return error(_("make_cache_entry failed for path '%s'"), name); if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD)) { free(ce); return error(_("could not add %s to temporary index"), name); } } hold_lock_file_for_update(&lock, state->fake_ancestor, LOCK_DIE_ON_ERROR); res = write_locked_index(&result, &lock, COMMIT_LOCK); discard_index(&result); if (res) return error(_("could not write temporary index to %s"), state->fake_ancestor); return 0; } static void stat_patch_list(struct apply_state *state, struct patch *patch) { int files, adds, dels; for (files = adds = dels = 0 ; patch ; patch = patch->next) { files++; adds += patch->lines_added; dels += patch->lines_deleted; show_stats(state, patch); } print_stat_summary(stdout, files, adds, dels); } static void numstat_patch_list(struct apply_state *state, struct patch *patch) { for ( ; patch; patch = patch->next) { const char *name; name = patch->new_name ? patch->new_name : patch->old_name; if (patch->is_binary) printf("-\t-\t"); else printf("%d\t%d\t", patch->lines_added, patch->lines_deleted); write_name_quoted(name, stdout, state->line_termination); } } static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name) { if (mode) printf(" %s mode %06o %s\n", newdelete, mode, name); else printf(" %s %s\n", newdelete, name); } static void show_mode_change(struct patch *p, int show_name) { if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) { if (show_name) printf(" mode change %06o => %06o %s\n", p->old_mode, p->new_mode, p->new_name); else printf(" mode change %06o => %06o\n", p->old_mode, p->new_mode); } } static void show_rename_copy(struct patch *p) { const char *renamecopy = p->is_rename ? "rename" : "copy"; const char *old, *new; /* Find common prefix */ old = p->old_name; new = p->new_name; while (1) { const char *slash_old, *slash_new; slash_old = strchr(old, '/'); slash_new = strchr(new, '/'); if (!slash_old || !slash_new || slash_old - old != slash_new - new || memcmp(old, new, slash_new - new)) break; old = slash_old + 1; new = slash_new + 1; } /* p->old_name thru old is the common prefix, and old and new * through the end of names are renames */ if (old != p->old_name) printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy, (int)(old - p->old_name), p->old_name, old, new, p->score); else printf(" %s %s => %s (%d%%)\n", renamecopy, p->old_name, p->new_name, p->score); show_mode_change(p, 0); } static void summary_patch_list(struct patch *patch) { struct patch *p; for (p = patch; p; p = p->next) { if (p->is_new) show_file_mode_name("create", p->new_mode, p->new_name); else if (p->is_delete) show_file_mode_name("delete", p->old_mode, p->old_name); else { if (p->is_rename || p->is_copy) show_rename_copy(p); else { if (p->score) { printf(" rewrite %s (%d%%)\n", p->new_name, p->score); show_mode_change(p, 0); } else show_mode_change(p, 1); } } } } static void patch_stats(struct apply_state *state, struct patch *patch) { int lines = patch->lines_added + patch->lines_deleted; if (lines > state->max_change) state->max_change = lines; if (patch->old_name) { int len = quote_c_style(patch->old_name, NULL, NULL, 0); if (!len) len = strlen(patch->old_name); if (len > state->max_len) state->max_len = len; } if (patch->new_name) { int len = quote_c_style(patch->new_name, NULL, NULL, 0); if (!len) len = strlen(patch->new_name); if (len > state->max_len) state->max_len = len; } } static int remove_file(struct apply_state *state, struct patch *patch, int rmdir_empty) { if (state->update_index) { if (remove_file_from_cache(patch->old_name) < 0) return error(_("unable to remove %s from index"), patch->old_name); } if (!state->cached) { if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) { remove_path(patch->old_name); } } return 0; } static int add_index_file(struct apply_state *state, const char *path, unsigned mode, void *buf, unsigned long size) { struct stat st; struct cache_entry *ce; int namelen = strlen(path); unsigned ce_size = cache_entry_size(namelen); if (!state->update_index) return 0; ce = xcalloc(1, ce_size); memcpy(ce->name, path, namelen); ce->ce_mode = create_ce_mode(mode); ce->ce_flags = create_ce_flags(0); ce->ce_namelen = namelen; if (S_ISGITLINK(mode)) { const char *s; if (!skip_prefix(buf, "Subproject commit ", &s) || get_oid_hex(s, &ce->oid)) { free(ce); return error(_("corrupt patch for submodule %s"), path); } } else { if (!state->cached) { if (lstat(path, &st) < 0) { free(ce); return error_errno(_("unable to stat newly " "created file '%s'"), path); } fill_stat_cache_info(ce, &st); } if (write_sha1_file(buf, size, blob_type, ce->oid.hash) < 0) { free(ce); return error(_("unable to create backing store " "for newly created file %s"), path); } } if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0) { free(ce); return error(_("unable to add cache entry for %s"), path); } return 0; } /* * Returns: * -1 if an unrecoverable error happened * 0 if everything went well * 1 if a recoverable error happened */ static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size) { int fd, res; struct strbuf nbuf = STRBUF_INIT; if (S_ISGITLINK(mode)) { struct stat st; if (!lstat(path, &st) && S_ISDIR(st.st_mode)) return 0; return !!mkdir(path, 0777); } if (has_symlinks && S_ISLNK(mode)) /* Although buf:size is counted string, it also is NUL * terminated. */ return !!symlink(buf, path); fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666); if (fd < 0) return 1; if (convert_to_working_tree(path, buf, size, &nbuf)) { size = nbuf.len; buf = nbuf.buf; } res = write_in_full(fd, buf, size) < 0; if (res) error_errno(_("failed to write to '%s'"), path); strbuf_release(&nbuf); if (close(fd) < 0 && !res) return error_errno(_("closing file '%s'"), path); return res ? -1 : 0; } /* * We optimistically assume that the directories exist, * which is true 99% of the time anyway. If they don't, * we create them and try again. * * Returns: * -1 on error * 0 otherwise */ static int create_one_file(struct apply_state *state, char *path, unsigned mode, const char *buf, unsigned long size) { int res; if (state->cached) return 0; res = try_create_file(path, mode, buf, size); if (res < 0) return -1; if (!res) return 0; if (errno == ENOENT) { if (safe_create_leading_directories(path)) return 0; res = try_create_file(path, mode, buf, size); if (res < 0) return -1; if (!res) return 0; } if (errno == EEXIST || errno == EACCES) { /* We may be trying to create a file where a directory * used to be. */ struct stat st; if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path))) errno = EEXIST; } if (errno == EEXIST) { unsigned int nr = getpid(); for (;;) { char newpath[PATH_MAX]; mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr); res = try_create_file(newpath, mode, buf, size); if (res < 0) return -1; if (!res) { if (!rename(newpath, path)) return 0; unlink_or_warn(newpath); break; } if (errno != EEXIST) break; ++nr; } } return error_errno(_("unable to write file '%s' mode %o"), path, mode); } static int add_conflicted_stages_file(struct apply_state *state, struct patch *patch) { int stage, namelen; unsigned ce_size, mode; struct cache_entry *ce; if (!state->update_index) return 0; namelen = strlen(patch->new_name); ce_size = cache_entry_size(namelen); mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644); remove_file_from_cache(patch->new_name); for (stage = 1; stage < 4; stage++) { if (is_null_oid(&patch->threeway_stage[stage - 1])) continue; ce = xcalloc(1, ce_size); memcpy(ce->name, patch->new_name, namelen); ce->ce_mode = create_ce_mode(mode); ce->ce_flags = create_ce_flags(stage); ce->ce_namelen = namelen; oidcpy(&ce->oid, &patch->threeway_stage[stage - 1]); if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0) { free(ce); return error(_("unable to add cache entry for %s"), patch->new_name); } } return 0; } static int create_file(struct apply_state *state, struct patch *patch) { char *path = patch->new_name; unsigned mode = patch->new_mode; unsigned long size = patch->resultsize; char *buf = patch->result; if (!mode) mode = S_IFREG | 0644; if (create_one_file(state, path, mode, buf, size)) return -1; if (patch->conflicted_threeway) return add_conflicted_stages_file(state, patch); else return add_index_file(state, path, mode, buf, size); } /* phase zero is to remove, phase one is to create */ static int write_out_one_result(struct apply_state *state, struct patch *patch, int phase) { if (patch->is_delete > 0) { if (phase == 0) return remove_file(state, patch, 1); return 0; } if (patch->is_new > 0 || patch->is_copy) { if (phase == 1) return create_file(state, patch); return 0; } /* * Rename or modification boils down to the same * thing: remove the old, write the new */ if (phase == 0) return remove_file(state, patch, patch->is_rename); if (phase == 1) return create_file(state, patch); return 0; } static int write_out_one_reject(struct apply_state *state, struct patch *patch) { FILE *rej; char namebuf[PATH_MAX]; struct fragment *frag; int cnt = 0; struct strbuf sb = STRBUF_INIT; for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) { if (!frag->rejected) continue; cnt++; } if (!cnt) { if (state->apply_verbosity > verbosity_normal) say_patch_name(stderr, _("Applied patch %s cleanly."), patch); return 0; } /* This should not happen, because a removal patch that leaves * contents are marked "rejected" at the patch level. */ if (!patch->new_name) die(_("internal error")); /* Say this even without --verbose */ strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...", "Applying patch %%s with %d rejects...", cnt), cnt); if (state->apply_verbosity > verbosity_silent) say_patch_name(stderr, sb.buf, patch); strbuf_release(&sb); cnt = strlen(patch->new_name); if (ARRAY_SIZE(namebuf) <= cnt + 5) { cnt = ARRAY_SIZE(namebuf) - 5; warning(_("truncating .rej filename to %.*s.rej"), cnt - 1, patch->new_name); } memcpy(namebuf, patch->new_name, cnt); memcpy(namebuf + cnt, ".rej", 5); rej = fopen(namebuf, "w"); if (!rej) return error_errno(_("cannot open %s"), namebuf); /* Normal git tools never deal with .rej, so do not pretend * this is a git patch by saying --git or giving extended * headers. While at it, maybe please "kompare" that wants * the trailing TAB and some garbage at the end of line ;-). */ fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n", patch->new_name, patch->new_name); for (cnt = 1, frag = patch->fragments; frag; cnt++, frag = frag->next) { if (!frag->rejected) { if (state->apply_verbosity > verbosity_silent) fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt); continue; } if (state->apply_verbosity > verbosity_silent) fprintf_ln(stderr, _("Rejected hunk #%d."), cnt); fprintf(rej, "%.*s", frag->size, frag->patch); if (frag->patch[frag->size-1] != '\n') fputc('\n', rej); } fclose(rej); return -1; } /* * Returns: * -1 if an error happened * 0 if the patch applied cleanly * 1 if the patch did not apply cleanly */ static int write_out_results(struct apply_state *state, struct patch *list) { int phase; int errs = 0; struct patch *l; struct string_list cpath = STRING_LIST_INIT_DUP; for (phase = 0; phase < 2; phase++) { l = list; while (l) { if (l->rejected) errs = 1; else { if (write_out_one_result(state, l, phase)) { string_list_clear(&cpath, 0); return -1; } if (phase == 1) { if (write_out_one_reject(state, l)) errs = 1; if (l->conflicted_threeway) { string_list_append(&cpath, l->new_name); errs = 1; } } } l = l->next; } } if (cpath.nr) { struct string_list_item *item; string_list_sort(&cpath); if (state->apply_verbosity > verbosity_silent) { for_each_string_list_item(item, &cpath) fprintf(stderr, "U %s\n", item->string); } string_list_clear(&cpath, 0); rerere(0); } return errs; } /* * Try to apply a patch. * * Returns: * -128 if a bad error happened (like patch unreadable) * -1 if patch did not apply and user cannot deal with it * 0 if the patch applied * 1 if the patch did not apply but user might fix it */ static int apply_patch(struct apply_state *state, int fd, const char *filename, int options) { size_t offset; struct strbuf buf = STRBUF_INIT; /* owns the patch text */ struct patch *list = NULL, **listp = &list; int skipped_patch = 0; int res = 0; state->patch_input_file = filename; if (read_patch_file(&buf, fd) < 0) return -128; offset = 0; while (offset < buf.len) { struct patch *patch; int nr; patch = xcalloc(1, sizeof(*patch)); patch->inaccurate_eof = !!(options & APPLY_OPT_INACCURATE_EOF); patch->recount = !!(options & APPLY_OPT_RECOUNT); nr = parse_chunk(state, buf.buf + offset, buf.len - offset, patch); if (nr < 0) { free_patch(patch); if (nr == -128) { res = -128; goto end; } break; } if (state->apply_in_reverse) reverse_patches(patch); if (use_patch(state, patch)) { patch_stats(state, patch); *listp = patch; listp = &patch->next; } else { if (state->apply_verbosity > verbosity_normal) say_patch_name(stderr, _("Skipped patch '%s'."), patch); free_patch(patch); skipped_patch++; } offset += nr; } if (!list && !skipped_patch) { error(_("unrecognized input")); res = -128; goto end; } if (state->whitespace_error && (state->ws_error_action == die_on_ws_error)) state->apply = 0; state->update_index = state->check_index && state->apply; if (state->update_index && state->newfd < 0) { if (state->index_file) state->newfd = hold_lock_file_for_update(state->lock_file, state->index_file, LOCK_DIE_ON_ERROR); else state->newfd = hold_locked_index(state->lock_file, LOCK_DIE_ON_ERROR); } if (state->check_index && read_apply_cache(state) < 0) { error(_("unable to read index file")); res = -128; goto end; } if (state->check || state->apply) { int r = check_patch_list(state, list); if (r == -128) { res = -128; goto end; } if (r < 0 && !state->apply_with_reject) { res = -1; goto end; } } if (state->apply) { int write_res = write_out_results(state, list); if (write_res < 0) { res = -128; goto end; } if (write_res > 0) { /* with --3way, we still need to write the index out */ res = state->apply_with_reject ? -1 : 1; goto end; } } if (state->fake_ancestor && build_fake_ancestor(state, list)) { res = -128; goto end; } if (state->diffstat && state->apply_verbosity > verbosity_silent) stat_patch_list(state, list); if (state->numstat && state->apply_verbosity > verbosity_silent) numstat_patch_list(state, list); if (state->summary && state->apply_verbosity > verbosity_silent) summary_patch_list(list); end: free_patch_list(list); strbuf_release(&buf); string_list_clear(&state->fn_table, 0); return res; } static int apply_option_parse_exclude(const struct option *opt, const char *arg, int unset) { struct apply_state *state = opt->value; add_name_limit(state, arg, 1); return 0; } static int apply_option_parse_include(const struct option *opt, const char *arg, int unset) { struct apply_state *state = opt->value; add_name_limit(state, arg, 0); state->has_include = 1; return 0; } static int apply_option_parse_p(const struct option *opt, const char *arg, int unset) { struct apply_state *state = opt->value; state->p_value = atoi(arg); state->p_value_known = 1; return 0; } static int apply_option_parse_space_change(const struct option *opt, const char *arg, int unset) { struct apply_state *state = opt->value; if (unset) state->ws_ignore_action = ignore_ws_none; else state->ws_ignore_action = ignore_ws_change; return 0; } static int apply_option_parse_whitespace(const struct option *opt, const char *arg, int unset) { struct apply_state *state = opt->value; state->whitespace_option = arg; if (parse_whitespace_option(state, arg)) exit(1); return 0; } static int apply_option_parse_directory(const struct option *opt, const char *arg, int unset) { struct apply_state *state = opt->value; strbuf_reset(&state->root); strbuf_addstr(&state->root, arg); strbuf_complete(&state->root, '/'); return 0; } int apply_all_patches(struct apply_state *state, int argc, const char **argv, int options) { int i; int res; int errs = 0; int read_stdin = 1; for (i = 0; i < argc; i++) { const char *arg = argv[i]; char *to_free = NULL; int fd; if (!strcmp(arg, "-")) { res = apply_patch(state, 0, "", options); if (res < 0) goto end; errs |= res; read_stdin = 0; continue; } else arg = to_free = prefix_filename(state->prefix, arg); fd = open(arg, O_RDONLY); if (fd < 0) { error(_("can't open patch '%s': %s"), arg, strerror(errno)); res = -128; free(to_free); goto end; } read_stdin = 0; set_default_whitespace_mode(state); res = apply_patch(state, fd, arg, options); close(fd); free(to_free); if (res < 0) goto end; errs |= res; } set_default_whitespace_mode(state); if (read_stdin) { res = apply_patch(state, 0, "", options); if (res < 0) goto end; errs |= res; } if (state->whitespace_error) { if (state->squelch_whitespace_errors && state->squelch_whitespace_errors < state->whitespace_error) { int squelched = state->whitespace_error - state->squelch_whitespace_errors; warning(Q_("squelched %d whitespace error", "squelched %d whitespace errors", squelched), squelched); } if (state->ws_error_action == die_on_ws_error) { error(Q_("%d line adds whitespace errors.", "%d lines add whitespace errors.", state->whitespace_error), state->whitespace_error); res = -128; goto end; } if (state->applied_after_fixing_ws && state->apply) warning(Q_("%d line applied after" " fixing whitespace errors.", "%d lines applied after" " fixing whitespace errors.", state->applied_after_fixing_ws), state->applied_after_fixing_ws); else if (state->whitespace_error) warning(Q_("%d line adds whitespace errors.", "%d lines add whitespace errors.", state->whitespace_error), state->whitespace_error); } if (state->update_index) { res = write_locked_index(&the_index, state->lock_file, COMMIT_LOCK); if (res) { error(_("Unable to write new index file")); res = -128; goto end; } state->newfd = -1; } res = !!errs; end: if (state->newfd >= 0) { rollback_lock_file(state->lock_file); state->newfd = -1; } if (state->apply_verbosity <= verbosity_silent) { set_error_routine(state->saved_error_routine); set_warn_routine(state->saved_warn_routine); } if (res > -1) return res; return (res == -1 ? 1 : 128); } int apply_parse_options(int argc, const char **argv, struct apply_state *state, int *force_apply, int *options, const char * const *apply_usage) { struct option builtin_apply_options[] = { { OPTION_CALLBACK, 0, "exclude", state, N_("path"), N_("don't apply changes matching the given path"), 0, apply_option_parse_exclude }, { OPTION_CALLBACK, 0, "include", state, N_("path"), N_("apply changes matching the given path"), 0, apply_option_parse_include }, { OPTION_CALLBACK, 'p', NULL, state, N_("num"), N_("remove leading slashes from traditional diff paths"), 0, apply_option_parse_p }, OPT_BOOL(0, "no-add", &state->no_add, N_("ignore additions made by the patch")), OPT_BOOL(0, "stat", &state->diffstat, N_("instead of applying the patch, output diffstat for the input")), OPT_NOOP_NOARG(0, "allow-binary-replacement"), OPT_NOOP_NOARG(0, "binary"), OPT_BOOL(0, "numstat", &state->numstat, N_("show number of added and deleted lines in decimal notation")), OPT_BOOL(0, "summary", &state->summary, N_("instead of applying the patch, output a summary for the input")), OPT_BOOL(0, "check", &state->check, N_("instead of applying the patch, see if the patch is applicable")), OPT_BOOL(0, "index", &state->check_index, N_("make sure the patch is applicable to the current index")), OPT_BOOL(0, "cached", &state->cached, N_("apply a patch without touching the working tree")), OPT_BOOL(0, "unsafe-paths", &state->unsafe_paths, N_("accept a patch that touches outside the working area")), OPT_BOOL(0, "apply", force_apply, N_("also apply the patch (use with --stat/--summary/--check)")), OPT_BOOL('3', "3way", &state->threeway, N_( "attempt three-way merge if a patch does not apply")), OPT_FILENAME(0, "build-fake-ancestor", &state->fake_ancestor, N_("build a temporary index based on embedded index information")), /* Think twice before adding "--nul" synonym to this */ OPT_SET_INT('z', NULL, &state->line_termination, N_("paths are separated with NUL character"), '\0'), OPT_INTEGER('C', NULL, &state->p_context, N_("ensure at least lines of context match")), { OPTION_CALLBACK, 0, "whitespace", state, N_("action"), N_("detect new or modified lines that have whitespace errors"), 0, apply_option_parse_whitespace }, { OPTION_CALLBACK, 0, "ignore-space-change", state, NULL, N_("ignore changes in whitespace when finding context"), PARSE_OPT_NOARG, apply_option_parse_space_change }, { OPTION_CALLBACK, 0, "ignore-whitespace", state, NULL, N_("ignore changes in whitespace when finding context"), PARSE_OPT_NOARG, apply_option_parse_space_change }, OPT_BOOL('R', "reverse", &state->apply_in_reverse, N_("apply the patch in reverse")), OPT_BOOL(0, "unidiff-zero", &state->unidiff_zero, N_("don't expect at least one line of context")), OPT_BOOL(0, "reject", &state->apply_with_reject, N_("leave the rejected hunks in corresponding *.rej files")), OPT_BOOL(0, "allow-overlap", &state->allow_overlap, N_("allow overlapping hunks")), OPT__VERBOSE(&state->apply_verbosity, N_("be verbose")), OPT_BIT(0, "inaccurate-eof", options, N_("tolerate incorrectly detected missing new-line at the end of file"), APPLY_OPT_INACCURATE_EOF), OPT_BIT(0, "recount", options, N_("do not trust the line counts in the hunk headers"), APPLY_OPT_RECOUNT), { OPTION_CALLBACK, 0, "directory", state, N_("root"), N_("prepend to all filenames"), 0, apply_option_parse_directory }, OPT_END() }; return parse_options(argc, argv, state->prefix, builtin_apply_options, apply_usage, 0); }