diff options
Diffstat (limited to 'dir.c')
| -rw-r--r-- | dir.c | 2708 |
1 files changed, 2708 insertions, 0 deletions
@@ -0,0 +1,2708 @@ +/* + * This handles recursive filename detection with exclude + * files, index knowledge etc.. + * + * See Documentation/technical/api-directory-listing.txt + * + * Copyright (C) Linus Torvalds, 2005-2006 + * Junio Hamano, 2005-2006 + */ +#include "cache.h" +#include "dir.h" +#include "refs.h" +#include "wildmatch.h" +#include "pathspec.h" +#include "utf8.h" +#include "varint.h" +#include "ewah/ewok.h" + +struct path_simplify { + int len; + const char *path; +}; + +/* + * Tells read_directory_recursive how a file or directory should be treated. + * Values are ordered by significance, e.g. if a directory contains both + * excluded and untracked files, it is listed as untracked because + * path_untracked > path_excluded. + */ +enum path_treatment { + path_none = 0, + path_recurse, + path_excluded, + path_untracked +}; + +/* + * Support data structure for our opendir/readdir/closedir wrappers + */ +struct cached_dir { + DIR *fdir; + struct untracked_cache_dir *untracked; + int nr_files; + int nr_dirs; + + struct dirent *de; + const char *file; + struct untracked_cache_dir *ucd; +}; + +static enum path_treatment read_directory_recursive(struct dir_struct *dir, + const char *path, int len, struct untracked_cache_dir *untracked, + int check_only, const struct path_simplify *simplify); +static int get_dtype(struct dirent *de, const char *path, int len); + +int fspathcmp(const char *a, const char *b) +{ + return ignore_case ? strcasecmp(a, b) : strcmp(a, b); +} + +int fspathncmp(const char *a, const char *b, size_t count) +{ + return ignore_case ? strncasecmp(a, b, count) : strncmp(a, b, count); +} + +int git_fnmatch(const struct pathspec_item *item, + const char *pattern, const char *string, + int prefix) +{ + if (prefix > 0) { + if (ps_strncmp(item, pattern, string, prefix)) + return WM_NOMATCH; + pattern += prefix; + string += prefix; + } + if (item->flags & PATHSPEC_ONESTAR) { + int pattern_len = strlen(++pattern); + int string_len = strlen(string); + return string_len < pattern_len || + ps_strcmp(item, pattern, + string + string_len - pattern_len); + } + if (item->magic & PATHSPEC_GLOB) + return wildmatch(pattern, string, + WM_PATHNAME | + (item->magic & PATHSPEC_ICASE ? WM_CASEFOLD : 0), + NULL); + else + /* wildmatch has not learned no FNM_PATHNAME mode yet */ + return wildmatch(pattern, string, + item->magic & PATHSPEC_ICASE ? WM_CASEFOLD : 0, + NULL); +} + +static int fnmatch_icase_mem(const char *pattern, int patternlen, + const char *string, int stringlen, + int flags) +{ + int match_status; + struct strbuf pat_buf = STRBUF_INIT; + struct strbuf str_buf = STRBUF_INIT; + const char *use_pat = pattern; + const char *use_str = string; + + if (pattern[patternlen]) { + strbuf_add(&pat_buf, pattern, patternlen); + use_pat = pat_buf.buf; + } + if (string[stringlen]) { + strbuf_add(&str_buf, string, stringlen); + use_str = str_buf.buf; + } + + if (ignore_case) + flags |= WM_CASEFOLD; + match_status = wildmatch(use_pat, use_str, flags, NULL); + + strbuf_release(&pat_buf); + strbuf_release(&str_buf); + + return match_status; +} + +static size_t common_prefix_len(const struct pathspec *pathspec) +{ + int n; + size_t max = 0; + + /* + * ":(icase)path" is treated as a pathspec full of + * wildcard. In other words, only prefix is considered common + * prefix. If the pathspec is abc/foo abc/bar, running in + * subdir xyz, the common prefix is still xyz, not xuz/abc as + * in non-:(icase). + */ + GUARD_PATHSPEC(pathspec, + PATHSPEC_FROMTOP | + PATHSPEC_MAXDEPTH | + PATHSPEC_LITERAL | + PATHSPEC_GLOB | + PATHSPEC_ICASE | + PATHSPEC_EXCLUDE); + + for (n = 0; n < pathspec->nr; n++) { + size_t i = 0, len = 0, item_len; + if (pathspec->items[n].magic & PATHSPEC_EXCLUDE) + continue; + if (pathspec->items[n].magic & PATHSPEC_ICASE) + item_len = pathspec->items[n].prefix; + else + item_len = pathspec->items[n].nowildcard_len; + while (i < item_len && (n == 0 || i < max)) { + char c = pathspec->items[n].match[i]; + if (c != pathspec->items[0].match[i]) + break; + if (c == '/') + len = i + 1; + i++; + } + if (n == 0 || len < max) { + max = len; + if (!max) + break; + } + } + return max; +} + +/* + * Returns a copy of the longest leading path common among all + * pathspecs. + */ +char *common_prefix(const struct pathspec *pathspec) +{ + unsigned long len = common_prefix_len(pathspec); + + return len ? xmemdupz(pathspec->items[0].match, len) : NULL; +} + +int fill_directory(struct dir_struct *dir, const struct pathspec *pathspec) +{ + size_t len; + + /* + * Calculate common prefix for the pathspec, and + * use that to optimize the directory walk + */ + len = common_prefix_len(pathspec); + + /* Read the directory and prune it */ + read_directory(dir, pathspec->nr ? pathspec->_raw[0] : "", len, pathspec); + return len; +} + +int within_depth(const char *name, int namelen, + int depth, int max_depth) +{ + const char *cp = name, *cpe = name + namelen; + + while (cp < cpe) { + if (*cp++ != '/') + continue; + depth++; + if (depth > max_depth) + return 0; + } + return 1; +} + +#define DO_MATCH_EXCLUDE 1 +#define DO_MATCH_DIRECTORY 2 + +/* + * Does 'match' match the given name? + * A match is found if + * + * (1) the 'match' string is leading directory of 'name', or + * (2) the 'match' string is a wildcard and matches 'name', or + * (3) the 'match' string is exactly the same as 'name'. + * + * and the return value tells which case it was. + * + * It returns 0 when there is no match. + */ +static int match_pathspec_item(const struct pathspec_item *item, int prefix, + const char *name, int namelen, unsigned flags) +{ + /* name/namelen has prefix cut off by caller */ + const char *match = item->match + prefix; + int matchlen = item->len - prefix; + + /* + * The normal call pattern is: + * 1. prefix = common_prefix_len(ps); + * 2. prune something, or fill_directory + * 3. match_pathspec() + * + * 'prefix' at #1 may be shorter than the command's prefix and + * it's ok for #2 to match extra files. Those extras will be + * trimmed at #3. + * + * Suppose the pathspec is 'foo' and '../bar' running from + * subdir 'xyz'. The common prefix at #1 will be empty, thanks + * to "../". We may have xyz/foo _and_ XYZ/foo after #2. The + * user does not want XYZ/foo, only the "foo" part should be + * case-insensitive. We need to filter out XYZ/foo here. In + * other words, we do not trust the caller on comparing the + * prefix part when :(icase) is involved. We do exact + * comparison ourselves. + * + * Normally the caller (common_prefix_len() in fact) does + * _exact_ matching on name[-prefix+1..-1] and we do not need + * to check that part. Be defensive and check it anyway, in + * case common_prefix_len is changed, or a new caller is + * introduced that does not use common_prefix_len. + * + * If the penalty turns out too high when prefix is really + * long, maybe change it to + * strncmp(match, name, item->prefix - prefix) + */ + if (item->prefix && (item->magic & PATHSPEC_ICASE) && + strncmp(item->match, name - prefix, item->prefix)) + return 0; + + /* If the match was just the prefix, we matched */ + if (!*match) + return MATCHED_RECURSIVELY; + + if (matchlen <= namelen && !ps_strncmp(item, match, name, matchlen)) { + if (matchlen == namelen) + return MATCHED_EXACTLY; + + if (match[matchlen-1] == '/' || name[matchlen] == '/') + return MATCHED_RECURSIVELY; + } else if ((flags & DO_MATCH_DIRECTORY) && + match[matchlen - 1] == '/' && + namelen == matchlen - 1 && + !ps_strncmp(item, match, name, namelen)) + return MATCHED_EXACTLY; + + if (item->nowildcard_len < item->len && + !git_fnmatch(item, match, name, + item->nowildcard_len - prefix)) + return MATCHED_FNMATCH; + + return 0; +} + +/* + * Given a name and a list of pathspecs, returns the nature of the + * closest (i.e. most specific) match of the name to any of the + * pathspecs. + * + * The caller typically calls this multiple times with the same + * pathspec and seen[] array but with different name/namelen + * (e.g. entries from the index) and is interested in seeing if and + * how each pathspec matches all the names it calls this function + * with. A mark is left in the seen[] array for each pathspec element + * indicating the closest type of match that element achieved, so if + * seen[n] remains zero after multiple invocations, that means the nth + * pathspec did not match any names, which could indicate that the + * user mistyped the nth pathspec. + */ +static int do_match_pathspec(const struct pathspec *ps, + const char *name, int namelen, + int prefix, char *seen, + unsigned flags) +{ + int i, retval = 0, exclude = flags & DO_MATCH_EXCLUDE; + + GUARD_PATHSPEC(ps, + PATHSPEC_FROMTOP | + PATHSPEC_MAXDEPTH | + PATHSPEC_LITERAL | + PATHSPEC_GLOB | + PATHSPEC_ICASE | + PATHSPEC_EXCLUDE); + + if (!ps->nr) { + if (!ps->recursive || + !(ps->magic & PATHSPEC_MAXDEPTH) || + ps->max_depth == -1) + return MATCHED_RECURSIVELY; + + if (within_depth(name, namelen, 0, ps->max_depth)) + return MATCHED_EXACTLY; + else + return 0; + } + + name += prefix; + namelen -= prefix; + + for (i = ps->nr - 1; i >= 0; i--) { + int how; + + if ((!exclude && ps->items[i].magic & PATHSPEC_EXCLUDE) || + ( exclude && !(ps->items[i].magic & PATHSPEC_EXCLUDE))) + continue; + + if (seen && seen[i] == MATCHED_EXACTLY) + continue; + /* + * Make exclude patterns optional and never report + * "pathspec ':(exclude)foo' matches no files" + */ + if (seen && ps->items[i].magic & PATHSPEC_EXCLUDE) + seen[i] = MATCHED_FNMATCH; + how = match_pathspec_item(ps->items+i, prefix, name, + namelen, flags); + if (ps->recursive && + (ps->magic & PATHSPEC_MAXDEPTH) && + ps->max_depth != -1 && + how && how != MATCHED_FNMATCH) { + int len = ps->items[i].len; + if (name[len] == '/') + len++; + if (within_depth(name+len, namelen-len, 0, ps->max_depth)) + how = MATCHED_EXACTLY; + else + how = 0; + } + if (how) { + if (retval < how) + retval = how; + if (seen && seen[i] < how) + seen[i] = how; + } + } + return retval; +} + +int match_pathspec(const struct pathspec *ps, + const char *name, int namelen, + int prefix, char *seen, int is_dir) +{ + int positive, negative; + unsigned flags = is_dir ? DO_MATCH_DIRECTORY : 0; + positive = do_match_pathspec(ps, name, namelen, + prefix, seen, flags); + if (!(ps->magic & PATHSPEC_EXCLUDE) || !positive) + return positive; + negative = do_match_pathspec(ps, name, namelen, + prefix, seen, + flags | DO_MATCH_EXCLUDE); + return negative ? 0 : positive; +} + +int report_path_error(const char *ps_matched, + const struct pathspec *pathspec, + const char *prefix) +{ + /* + * Make sure all pathspec matched; otherwise it is an error. + */ + int num, errors = 0; + for (num = 0; num < pathspec->nr; num++) { + int other, found_dup; + + if (ps_matched[num]) + continue; + /* + * The caller might have fed identical pathspec + * twice. Do not barf on such a mistake. + * FIXME: parse_pathspec should have eliminated + * duplicate pathspec. + */ + for (found_dup = other = 0; + !found_dup && other < pathspec->nr; + other++) { + if (other == num || !ps_matched[other]) + continue; + if (!strcmp(pathspec->items[other].original, + pathspec->items[num].original)) + /* + * Ok, we have a match already. + */ + found_dup = 1; + } + if (found_dup) + continue; + + error("pathspec '%s' did not match any file(s) known to git.", + pathspec->items[num].original); + errors++; + } + return errors; +} + +/* + * Return the length of the "simple" part of a path match limiter. + */ +int simple_length(const char *match) +{ + int len = -1; + + for (;;) { + unsigned char c = *match++; + len++; + if (c == '\0' || is_glob_special(c)) + return len; + } +} + +int no_wildcard(const char *string) +{ + return string[simple_length(string)] == '\0'; +} + +void parse_exclude_pattern(const char **pattern, + int *patternlen, + unsigned *flags, + int *nowildcardlen) +{ + const char *p = *pattern; + size_t i, len; + + *flags = 0; + if (*p == '!') { + *flags |= EXC_FLAG_NEGATIVE; + p++; + } + len = strlen(p); + if (len && p[len - 1] == '/') { + len--; + *flags |= EXC_FLAG_MUSTBEDIR; + } + for (i = 0; i < len; i++) { + if (p[i] == '/') + break; + } + if (i == len) + *flags |= EXC_FLAG_NODIR; + *nowildcardlen = simple_length(p); + /* + * we should have excluded the trailing slash from 'p' too, + * but that's one more allocation. Instead just make sure + * nowildcardlen does not exceed real patternlen + */ + if (*nowildcardlen > len) + *nowildcardlen = len; + if (*p == '*' && no_wildcard(p + 1)) + *flags |= EXC_FLAG_ENDSWITH; + *pattern = p; + *patternlen = len; +} + +void add_exclude(const char *string, const char *base, + int baselen, struct exclude_list *el, int srcpos) +{ + struct exclude *x; + int patternlen; + unsigned flags; + int nowildcardlen; + + parse_exclude_pattern(&string, &patternlen, &flags, &nowildcardlen); + if (flags & EXC_FLAG_MUSTBEDIR) { + FLEXPTR_ALLOC_MEM(x, pattern, string, patternlen); + } else { + x = xmalloc(sizeof(*x)); + x->pattern = string; + } + x->patternlen = patternlen; + x->nowildcardlen = nowildcardlen; + x->base = base; + x->baselen = baselen; + x->flags = flags; + x->srcpos = srcpos; + ALLOC_GROW(el->excludes, el->nr + 1, el->alloc); + el->excludes[el->nr++] = x; + x->el = el; +} + +static void *read_skip_worktree_file_from_index(const char *path, size_t *size, + struct sha1_stat *sha1_stat) +{ + int pos, len; + unsigned long sz; + enum object_type type; + void *data; + + len = strlen(path); + pos = cache_name_pos(path, len); + if (pos < 0) + return NULL; + if (!ce_skip_worktree(active_cache[pos])) + return NULL; + data = read_sha1_file(active_cache[pos]->oid.hash, &type, &sz); + if (!data || type != OBJ_BLOB) { + free(data); + return NULL; + } + *size = xsize_t(sz); + if (sha1_stat) { + memset(&sha1_stat->stat, 0, sizeof(sha1_stat->stat)); + hashcpy(sha1_stat->sha1, active_cache[pos]->oid.hash); + } + return data; +} + +/* + * Frees memory within el which was allocated for exclude patterns and + * the file buffer. Does not free el itself. + */ +void clear_exclude_list(struct exclude_list *el) +{ + int i; + + for (i = 0; i < el->nr; i++) + free(el->excludes[i]); + free(el->excludes); + free(el->filebuf); + + memset(el, 0, sizeof(*el)); +} + +static void trim_trailing_spaces(char *buf) +{ + char *p, *last_space = NULL; + + for (p = buf; *p; p++) + switch (*p) { + case ' ': + if (!last_space) + last_space = p; + break; + case '\\': + p++; + if (!*p) + return; + /* fallthrough */ + default: + last_space = NULL; + } + + if (last_space) + *last_space = '\0'; +} + +/* + * Given a subdirectory name and "dir" of the current directory, + * search the subdir in "dir" and return it, or create a new one if it + * does not exist in "dir". + * + * If "name" has the trailing slash, it'll be excluded in the search. + */ +static struct untracked_cache_dir *lookup_untracked(struct untracked_cache *uc, + struct untracked_cache_dir *dir, + const char *name, int len) +{ + int first, last; + struct untracked_cache_dir *d; + if (!dir) + return NULL; + if (len && name[len - 1] == '/') + len--; + first = 0; + last = dir->dirs_nr; + while (last > first) { + int cmp, next = (last + first) >> 1; + d = dir->dirs[next]; + cmp = strncmp(name, d->name, len); + if (!cmp && strlen(d->name) > len) + cmp = -1; + if (!cmp) + return d; + if (cmp < 0) { + last = next; + continue; + } + first = next+1; + } + + uc->dir_created++; + FLEX_ALLOC_MEM(d, name, name, len); + + ALLOC_GROW(dir->dirs, dir->dirs_nr + 1, dir->dirs_alloc); + memmove(dir->dirs + first + 1, dir->dirs + first, + (dir->dirs_nr - first) * sizeof(*dir->dirs)); + dir->dirs_nr++; + dir->dirs[first] = d; + return d; +} + +static void do_invalidate_gitignore(struct untracked_cache_dir *dir) +{ + int i; + dir->valid = 0; + dir->untracked_nr = 0; + for (i = 0; i < dir->dirs_nr; i++) + do_invalidate_gitignore(dir->dirs[i]); +} + +static void invalidate_gitignore(struct untracked_cache *uc, + struct untracked_cache_dir *dir) +{ + uc->gitignore_invalidated++; + do_invalidate_gitignore(dir); +} + +static void invalidate_directory(struct untracked_cache *uc, + struct untracked_cache_dir *dir) +{ + int i; + uc->dir_invalidated++; + dir->valid = 0; + dir->untracked_nr = 0; + for (i = 0; i < dir->dirs_nr; i++) + dir->dirs[i]->recurse = 0; +} + +/* + * Given a file with name "fname", read it (either from disk, or from + * the index if "check_index" is non-zero), parse it and store the + * exclude rules in "el". + * + * If "ss" is not NULL, compute SHA-1 of the exclude file and fill + * stat data from disk (only valid if add_excludes returns zero). If + * ss_valid is non-zero, "ss" must contain good value as input. + */ +static int add_excludes(const char *fname, const char *base, int baselen, + struct exclude_list *el, int check_index, + struct sha1_stat *sha1_stat) +{ + struct stat st; + int fd, i, lineno = 1; + size_t size = 0; + char *buf, *entry; + + fd = open(fname, O_RDONLY); + if (fd < 0 || fstat(fd, &st) < 0) { + if (errno != ENOENT) + warn_on_inaccessible(fname); + if (0 <= fd) + close(fd); + if (!check_index || + (buf = read_skip_worktree_file_from_index(fname, &size, sha1_stat)) == NULL) + return -1; + if (size == 0) { + free(buf); + return 0; + } + if (buf[size-1] != '\n') { + buf = xrealloc(buf, st_add(size, 1)); + buf[size++] = '\n'; + } + } else { + size = xsize_t(st.st_size); + if (size == 0) { + if (sha1_stat) { + fill_stat_data(&sha1_stat->stat, &st); + hashcpy(sha1_stat->sha1, EMPTY_BLOB_SHA1_BIN); + sha1_stat->valid = 1; + } + close(fd); + return 0; + } + buf = xmallocz(size); + if (read_in_full(fd, buf, size) != size) { + free(buf); + close(fd); + return -1; + } + buf[size++] = '\n'; + close(fd); + if (sha1_stat) { + int pos; + if (sha1_stat->valid && + !match_stat_data_racy(&the_index, &sha1_stat->stat, &st)) + ; /* no content change, ss->sha1 still good */ + else if (check_index && + (pos = cache_name_pos(fname, strlen(fname))) >= 0 && + !ce_stage(active_cache[pos]) && + ce_uptodate(active_cache[pos]) && + !would_convert_to_git(fname)) + hashcpy(sha1_stat->sha1, + active_cache[pos]->oid.hash); + else + hash_sha1_file(buf, size, "blob", sha1_stat->sha1); + fill_stat_data(&sha1_stat->stat, &st); + sha1_stat->valid = 1; + } + } + + el->filebuf = buf; + + if (skip_utf8_bom(&buf, size)) + size -= buf - el->filebuf; + + entry = buf; + + for (i = 0; i < size; i++) { + if (buf[i] == '\n') { + if (entry != buf + i && entry[0] != '#') { + buf[i - (i && buf[i-1] == '\r')] = 0; + trim_trailing_spaces(entry); + add_exclude(entry, base, baselen, el, lineno); + } + lineno++; + entry = buf + i + 1; + } + } + return 0; +} + +int add_excludes_from_file_to_list(const char *fname, const char *base, + int baselen, struct exclude_list *el, + int check_index) +{ + return add_excludes(fname, base, baselen, el, check_index, NULL); +} + +struct exclude_list *add_exclude_list(struct dir_struct *dir, + int group_type, const char *src) +{ + struct exclude_list *el; + struct exclude_list_group *group; + + group = &dir->exclude_list_group[group_type]; + ALLOC_GROW(group->el, group->nr + 1, group->alloc); + el = &group->el[group->nr++]; + memset(el, 0, sizeof(*el)); + el->src = src; + return el; +} + +/* + * Used to set up core.excludesfile and .git/info/exclude lists. + */ +static void add_excludes_from_file_1(struct dir_struct *dir, const char *fname, + struct sha1_stat *sha1_stat) +{ + struct exclude_list *el; + /* + * catch setup_standard_excludes() that's called before + * dir->untracked is assigned. That function behaves + * differently when dir->untracked is non-NULL. + */ + if (!dir->untracked) + dir->unmanaged_exclude_files++; + el = add_exclude_list(dir, EXC_FILE, fname); + if (add_excludes(fname, "", 0, el, 0, sha1_stat) < 0) + die("cannot use %s as an exclude file", fname); +} + +void add_excludes_from_file(struct dir_struct *dir, const char *fname) +{ + dir->unmanaged_exclude_files++; /* see validate_untracked_cache() */ + add_excludes_from_file_1(dir, fname, NULL); +} + +int match_basename(const char *basename, int basenamelen, + const char *pattern, int prefix, int patternlen, + unsigned flags) +{ + if (prefix == patternlen) { + if (patternlen == basenamelen && + !fspathncmp(pattern, basename, basenamelen)) + return 1; + } else if (flags & EXC_FLAG_ENDSWITH) { + /* "*literal" matching against "fooliteral" */ + if (patternlen - 1 <= basenamelen && + !fspathncmp(pattern + 1, + basename + basenamelen - (patternlen - 1), + patternlen - 1)) + return 1; + } else { + if (fnmatch_icase_mem(pattern, patternlen, + basename, basenamelen, + 0) == 0) + return 1; + } + return 0; +} + +int match_pathname(const char *pathname, int pathlen, + const char *base, int baselen, + const char *pattern, int prefix, int patternlen, + unsigned flags) +{ + const char *name; + int namelen; + + /* + * match with FNM_PATHNAME; the pattern has base implicitly + * in front of it. + */ + if (*pattern == '/') { + pattern++; + patternlen--; + prefix--; + } + + /* + * baselen does not count the trailing slash. base[] may or + * may not end with a trailing slash though. + */ + if (pathlen < baselen + 1 || + (baselen && pathname[baselen] != '/') || + fspathncmp(pathname, base, baselen)) + return 0; + + namelen = baselen ? pathlen - baselen - 1 : pathlen; + name = pathname + pathlen - namelen; + + if (prefix) { + /* + * if the non-wildcard part is longer than the + * remaining pathname, surely it cannot match. + */ + if (prefix > namelen) + return 0; + + if (fspathncmp(pattern, name, prefix)) + return 0; + pattern += prefix; + patternlen -= prefix; + name += prefix; + namelen -= prefix; + + /* + * If the whole pattern did not have a wildcard, + * then our prefix match is all we need; we + * do not need to call fnmatch at all. + */ + if (!patternlen && !namelen) + return 1; + } + + return fnmatch_icase_mem(pattern, patternlen, + name, namelen, + WM_PATHNAME) == 0; +} + +/* + * Scan the given exclude list in reverse to see whether pathname + * should be ignored. The first match (i.e. the last on the list), if + * any, determines the fate. Returns the exclude_list element which + * matched, or NULL for undecided. + */ +static struct exclude *last_exclude_matching_from_list(const char *pathname, + int pathlen, + const char *basename, + int *dtype, + struct exclude_list *el) +{ + struct exclude *exc = NULL; /* undecided */ + int i; + + if (!el->nr) + return NULL; /* undefined */ + + for (i = el->nr - 1; 0 <= i; i--) { + struct exclude *x = el->excludes[i]; + const char *exclude = x->pattern; + int prefix = x->nowildcardlen; + + if (x->flags & EXC_FLAG_MUSTBEDIR) { + if (*dtype == DT_UNKNOWN) + *dtype = get_dtype(NULL, pathname, pathlen); + if (*dtype != DT_DIR) + continue; + } + + if (x->flags & EXC_FLAG_NODIR) { + if (match_basename(basename, + pathlen - (basename - pathname), + exclude, prefix, x->patternlen, + x->flags)) { + exc = x; + break; + } + continue; + } + + assert(x->baselen == 0 || x->base[x->baselen - 1] == '/'); + if (match_pathname(pathname, pathlen, + x->base, x->baselen ? x->baselen - 1 : 0, + exclude, prefix, x->patternlen, x->flags)) { + exc = x; + break; + } + } + return exc; +} + +/* + * Scan the list and let the last match determine the fate. + * Return 1 for exclude, 0 for include and -1 for undecided. + */ +int is_excluded_from_list(const char *pathname, + int pathlen, const char *basename, int *dtype, + struct exclude_list *el) +{ + struct exclude *exclude; + exclude = last_exclude_matching_from_list(pathname, pathlen, basename, dtype, el); + if (exclude) + return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1; + return -1; /* undecided */ +} + +static struct exclude *last_exclude_matching_from_lists(struct dir_struct *dir, + const char *pathname, int pathlen, const char *basename, + int *dtype_p) +{ + int i, j; + struct exclude_list_group *group; + struct exclude *exclude; + for (i = EXC_CMDL; i <= EXC_FILE; i++) { + group = &dir->exclude_list_group[i]; + for (j = group->nr - 1; j >= 0; j--) { + exclude = last_exclude_matching_from_list( + pathname, pathlen, basename, dtype_p, + &group->el[j]); + if (exclude) + return exclude; + } + } + return NULL; +} + +/* + * Loads the per-directory exclude list for the substring of base + * which has a char length of baselen. + */ +static void prep_exclude(struct dir_struct *dir, const char *base, int baselen) +{ + struct exclude_list_group *group; + struct exclude_list *el; + struct exclude_stack *stk = NULL; + struct untracked_cache_dir *untracked; + int current; + + group = &dir->exclude_list_group[EXC_DIRS]; + + /* + * Pop the exclude lists from the EXCL_DIRS exclude_list_group + * which originate from directories not in the prefix of the + * path being checked. + */ + while ((stk = dir->exclude_stack) != NULL) { + if (stk->baselen <= baselen && + !strncmp(dir->basebuf.buf, base, stk->baselen)) + break; + el = &group->el[dir->exclude_stack->exclude_ix]; + dir->exclude_stack = stk->prev; + dir->exclude = NULL; + free((char *)el->src); /* see strbuf_detach() below */ + clear_exclude_list(el); + free(stk); + group->nr--; + } + + /* Skip traversing into sub directories if the parent is excluded */ + if (dir->exclude) + return; + + /* + * Lazy initialization. All call sites currently just + * memset(dir, 0, sizeof(*dir)) before use. Changing all of + * them seems lots of work for little benefit. + */ + if (!dir->basebuf.buf) + strbuf_init(&dir->basebuf, PATH_MAX); + + /* Read from the parent directories and push them down. */ + current = stk ? stk->baselen : -1; + strbuf_setlen(&dir->basebuf, current < 0 ? 0 : current); + if (dir->untracked) + untracked = stk ? stk->ucd : dir->untracked->root; + else + untracked = NULL; + + while (current < baselen) { + const char *cp; + struct sha1_stat sha1_stat; + + stk = xcalloc(1, sizeof(*stk)); + if (current < 0) { + cp = base; + current = 0; + } else { + cp = strchr(base + current + 1, '/'); + if (!cp) + die("oops in prep_exclude"); + cp++; + untracked = + lookup_untracked(dir->untracked, untracked, + base + current, + cp - base - current); + } + stk->prev = dir->exclude_stack; + stk->baselen = cp - base; + stk->exclude_ix = group->nr; + stk->ucd = untracked; + el = add_exclude_list(dir, EXC_DIRS, NULL); + strbuf_add(&dir->basebuf, base + current, stk->baselen - current); + assert(stk->baselen == dir->basebuf.len); + + /* Abort if the directory is excluded */ + if (stk->baselen) { + int dt = DT_DIR; + dir->basebuf.buf[stk->baselen - 1] = 0; + dir->exclude = last_exclude_matching_from_lists(dir, + dir->basebuf.buf, stk->baselen - 1, + dir->basebuf.buf + current, &dt); + dir->basebuf.buf[stk->baselen - 1] = '/'; + if (dir->exclude && + dir->exclude->flags & EXC_FLAG_NEGATIVE) + dir->exclude = NULL; + if (dir->exclude) { + dir->exclude_stack = stk; + return; + } + } + + /* Try to read per-directory file */ + hashclr(sha1_stat.sha1); + sha1_stat.valid = 0; + if (dir->exclude_per_dir && + /* + * If we know that no files have been added in + * this directory (i.e. valid_cached_dir() has + * been executed and set untracked->valid) .. + */ + (!untracked || !untracked->valid || + /* + * .. and .gitignore does not exist before + * (i.e. null exclude_sha1). Then we can skip + * loading .gitignore, which would result in + * ENOENT anyway. + */ + !is_null_sha1(untracked->exclude_sha1))) { + /* + * dir->basebuf gets reused by the traversal, but we + * need fname to remain unchanged to ensure the src + * member of each struct exclude correctly + * back-references its source file. Other invocations + * of add_exclude_list provide stable strings, so we + * strbuf_detach() and free() here in the caller. + */ + struct strbuf sb = STRBUF_INIT; + strbuf_addbuf(&sb, &dir->basebuf); + strbuf_addstr(&sb, dir->exclude_per_dir); + el->src = strbuf_detach(&sb, NULL); + add_excludes(el->src, el->src, stk->baselen, el, 1, + untracked ? &sha1_stat : NULL); + } + /* + * NEEDSWORK: when untracked cache is enabled, prep_exclude() + * will first be called in valid_cached_dir() then maybe many + * times more in last_exclude_matching(). When the cache is + * used, last_exclude_matching() will not be called and + * reading .gitignore content will be a waste. + * + * So when it's called by valid_cached_dir() and we can get + * .gitignore SHA-1 from the index (i.e. .gitignore is not + * modified on work tree), we could delay reading the + * .gitignore content until we absolutely need it in + * last_exclude_matching(). Be careful about ignore rule + * order, though, if you do that. + */ + if (untracked && + hashcmp(sha1_stat.sha1, untracked->exclude_sha1)) { + invalidate_gitignore(dir->untracked, untracked); + hashcpy(untracked->exclude_sha1, sha1_stat.sha1); + } + dir->exclude_stack = stk; + current = stk->baselen; + } + strbuf_setlen(&dir->basebuf, baselen); +} + +/* + * Loads the exclude lists for the directory containing pathname, then + * scans all exclude lists to determine whether pathname is excluded. + * Returns the exclude_list element which matched, or NULL for + * undecided. + */ +struct exclude *last_exclude_matching(struct dir_struct *dir, + const char *pathname, + int *dtype_p) +{ + int pathlen = strlen(pathname); + const char *basename = strrchr(pathname, '/'); + basename = (basename) ? basename+1 : pathname; + + prep_exclude(dir, pathname, basename-pathname); + + if (dir->exclude) + return dir->exclude; + + return last_exclude_matching_from_lists(dir, pathname, pathlen, + basename, dtype_p); +} + +/* + * Loads the exclude lists for the directory containing pathname, then + * scans all exclude lists to determine whether pathname is excluded. + * Returns 1 if true, otherwise 0. + */ +int is_excluded(struct dir_struct *dir, const char *pathname, int *dtype_p) +{ + struct exclude *exclude = + last_exclude_matching(dir, pathname, dtype_p); + if (exclude) + return exclude->flags & EXC_FLAG_NEGATIVE ? 0 : 1; + return 0; +} + +static struct dir_entry *dir_entry_new(const char *pathname, int len) +{ + struct dir_entry *ent; + + FLEX_ALLOC_MEM(ent, name, pathname, len); + ent->len = len; + return ent; +} + +static struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len) +{ + if (cache_file_exists(pathname, len, ignore_case)) + return NULL; + + ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc); + return dir->entries[dir->nr++] = dir_entry_new(pathname, len); +} + +struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len) +{ + if (!cache_name_is_other(pathname, len)) + return NULL; + + ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc); + return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len); +} + +enum exist_status { + index_nonexistent = 0, + index_directory, + index_gitdir +}; + +/* + * Do not use the alphabetically sorted index to look up + * the directory name; instead, use the case insensitive + * directory hash. + */ +static enum exist_status directory_exists_in_index_icase(const char *dirname, int len) +{ + struct cache_entry *ce; + + if (cache_dir_exists(dirname, len)) + return index_directory; + + ce = cache_file_exists(dirname, len, ignore_case); + if (ce && S_ISGITLINK(ce->ce_mode)) + return index_gitdir; + + return index_nonexistent; +} + +/* + * The index sorts alphabetically by entry name, which + * means that a gitlink sorts as '\0' at the end, while + * a directory (which is defined not as an entry, but as + * the files it contains) will sort with the '/' at the + * end. + */ +static enum exist_status directory_exists_in_index(const char *dirname, int len) +{ + int pos; + + if (ignore_case) + return directory_exists_in_index_icase(dirname, len); + + pos = cache_name_pos(dirname, len); + if (pos < 0) + pos = -pos-1; + while (pos < active_nr) { + const struct cache_entry *ce = active_cache[pos++]; + unsigned char endchar; + + if (strncmp(ce->name, dirname, len)) + break; + endchar = ce->name[len]; + if (endchar > '/') + break; + if (endchar == '/') + return index_directory; + if (!endchar && S_ISGITLINK(ce->ce_mode)) + return index_gitdir; + } + return index_nonexistent; +} + +/* + * When we find a directory when traversing the filesystem, we + * have three distinct cases: + * + * - ignore it + * - see it as a directory + * - recurse into it + * + * and which one we choose depends on a combination of existing + * git index contents and the flags passed into the directory + * traversal routine. + * + * Case 1: If we *already* have entries in the index under that + * directory name, we always recurse into the directory to see + * all the files. + * + * Case 2: If we *already* have that directory name as a gitlink, + * we always continue to see it as a gitlink, regardless of whether + * there is an actual git directory there or not (it might not + * be checked out as a subproject!) + * + * Case 3: if we didn't have it in the index previously, we + * have a few sub-cases: + * + * (a) if "show_other_directories" is true, we show it as + * just a directory, unless "hide_empty_directories" is + * also true, in which case we need to check if it contains any + * untracked and / or ignored files. + * (b) if it looks like a git directory, and we don't have + * 'no_gitlinks' set we treat it as a gitlink, and show it + * as a directory. + * (c) otherwise, we recurse into it. + */ +static enum path_treatment treat_directory(struct dir_struct *dir, + struct untracked_cache_dir *untracked, + const char *dirname, int len, int baselen, int exclude, + const struct path_simplify *simplify) +{ + /* The "len-1" is to strip the final '/' */ + switch (directory_exists_in_index(dirname, len-1)) { + case index_directory: + return path_recurse; + + case index_gitdir: + return path_none; + + case index_nonexistent: + if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES) + break; + if (!(dir->flags & DIR_NO_GITLINKS)) { + unsigned char sha1[20]; + if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0) + return path_untracked; + } + return path_recurse; + } + + /* This is the "show_other_directories" case */ + + if (!(dir->flags & DIR_HIDE_EMPTY_DIRECTORIES)) + return exclude ? path_excluded : path_untracked; + + untracked = lookup_untracked(dir->untracked, untracked, + dirname + baselen, len - baselen); + return read_directory_recursive(dir, dirname, len, + untracked, 1, simplify); +} + +/* + * This is an inexact early pruning of any recursive directory + * reading - if the path cannot possibly be in the pathspec, + * return true, and we'll skip it early. + */ +static int simplify_away(const char *path, int pathlen, const struct path_simplify *simplify) +{ + if (simplify) { + for (;;) { + const char *match = simplify->path; + int len = simplify->len; + + if (!match) + break; + if (len > pathlen) + len = pathlen; + if (!memcmp(path, match, len)) + return 0; + simplify++; + } + return 1; + } + return 0; +} + +/* + * This function tells us whether an excluded path matches a + * list of "interesting" pathspecs. That is, whether a path matched + * by any of the pathspecs could possibly be ignored by excluding + * the specified path. This can happen if: + * + * 1. the path is mentioned explicitly in the pathspec + * + * 2. the path is a directory prefix of some element in the + * pathspec + */ +static int exclude_matches_pathspec(const char *path, int len, + const struct path_simplify *simplify) +{ + if (simplify) { + for (; simplify->path; simplify++) { + if (len == simplify->len + && !memcmp(path, simplify->path, len)) + return 1; + if (len < simplify->len + && simplify->path[len] == '/' + && !memcmp(path, simplify->path, len)) + return 1; + } + } + return 0; +} + +static int get_index_dtype(const char *path, int len) +{ + int pos; + const struct cache_entry *ce; + + ce = cache_file_exists(path, len, 0); + if (ce) { + if (!ce_uptodate(ce)) + return DT_UNKNOWN; + if (S_ISGITLINK(ce->ce_mode)) + return DT_DIR; + /* + * Nobody actually cares about the + * difference between DT_LNK and DT_REG + */ + return DT_REG; + } + + /* Try to look it up as a directory */ + pos = cache_name_pos(path, len); + if (pos >= 0) + return DT_UNKNOWN; + pos = -pos-1; + while (pos < active_nr) { + ce = active_cache[pos++]; + if (strncmp(ce->name, path, len)) + break; + if (ce->name[len] > '/') + break; + if (ce->name[len] < '/') + continue; + if (!ce_uptodate(ce)) + break; /* continue? */ + return DT_DIR; + } + return DT_UNKNOWN; +} + +static int get_dtype(struct dirent *de, const char *path, int len) +{ + int dtype = de ? DTYPE(de) : DT_UNKNOWN; + struct stat st; + + if (dtype != DT_UNKNOWN) + return dtype; + dtype = get_index_dtype(path, len); + if (dtype != DT_UNKNOWN) + return dtype; + if (lstat(path, &st)) + return dtype; + if (S_ISREG(st.st_mode)) + return DT_REG; + if (S_ISDIR(st.st_mode)) + return DT_DIR; + if (S_ISLNK(st.st_mode)) + return DT_LNK; + return dtype; +} + +static enum path_treatment treat_one_path(struct dir_struct *dir, + struct untracked_cache_dir *untracked, + struct strbuf *path, + int baselen, + const struct path_simplify *simplify, + int dtype, struct dirent *de) +{ + int exclude; + int has_path_in_index = !!cache_file_exists(path->buf, path->len, ignore_case); + + if (dtype == DT_UNKNOWN) + dtype = get_dtype(de, path->buf, path->len); + + /* Always exclude indexed files */ + if (dtype != DT_DIR && has_path_in_index) + return path_none; + + /* + * When we are looking at a directory P in the working tree, + * there are three cases: + * + * (1) P exists in the index. Everything inside the directory P in + * the working tree needs to go when P is checked out from the + * index. + * + * (2) P does not exist in the index, but there is P/Q in the index. + * We know P will stay a directory when we check out the contents + * of the index, but we do not know yet if there is a directory + * P/Q in the working tree to be killed, so we need to recurse. + * + * (3) P does not exist in the index, and there is no P/Q in the index + * to require P to be a directory, either. Only in this case, we + * know that everything inside P will not be killed without + * recursing. + */ + if ((dir->flags & DIR_COLLECT_KILLED_ONLY) && + (dtype == DT_DIR) && + !has_path_in_index && + (directory_exists_in_index(path->buf, path->len) == index_nonexistent)) + return path_none; + + exclude = is_excluded(dir, path->buf, &dtype); + + /* + * Excluded? If we don't explicitly want to show + * ignored files, ignore it + */ + if (exclude && !(dir->flags & (DIR_SHOW_IGNORED|DIR_SHOW_IGNORED_TOO))) + return path_excluded; + + switch (dtype) { + default: + return path_none; + case DT_DIR: + strbuf_addch(path, '/'); + return treat_directory(dir, untracked, path->buf, path->len, + baselen, exclude, simplify); + case DT_REG: + case DT_LNK: + return exclude ? path_excluded : path_untracked; + } +} + +static enum path_treatment treat_path_fast(struct dir_struct *dir, + struct untracked_cache_dir *untracked, + struct cached_dir *cdir, + struct strbuf *path, + int baselen, + const struct path_simplify *simplify) +{ + strbuf_setlen(path, baselen); + if (!cdir->ucd) { + strbuf_addstr(path, cdir->file); + return path_untracked; + } + strbuf_addstr(path, cdir->ucd->name); + /* treat_one_path() does this before it calls treat_directory() */ + strbuf_complete(path, '/'); + if (cdir->ucd->check_only) + /* + * check_only is set as a result of treat_directory() getting + * to its bottom. Verify again the same set of directories + * with check_only set. + */ + return read_directory_recursive(dir, path->buf, path->len, + cdir->ucd, 1, simplify); + /* + * We get path_recurse in the first run when + * directory_exists_in_index() returns index_nonexistent. We + * are sure that new changes in the index does not impact the + * outcome. Return now. + */ + return path_recurse; +} + +static enum path_treatment treat_path(struct dir_struct *dir, + struct untracked_cache_dir *untracked, + struct cached_dir *cdir, + struct strbuf *path, + int baselen, + const struct path_simplify *simplify) +{ + int dtype; + struct dirent *de = cdir->de; + + if (!de) + return treat_path_fast(dir, untracked, cdir, path, + baselen, simplify); + if (is_dot_or_dotdot(de->d_name) || !strcmp(de->d_name, ".git")) + return path_none; + strbuf_setlen(path, baselen); + strbuf_addstr(path, de->d_name); + if (simplify_away(path->buf, path->len, simplify)) + return path_none; + + dtype = DTYPE(de); + return treat_one_path(dir, untracked, path, baselen, simplify, dtype, de); +} + +static void add_untracked(struct untracked_cache_dir *dir, const char *name) +{ + if (!dir) + return; + ALLOC_GROW(dir->untracked, dir->untracked_nr + 1, + dir->untracked_alloc); + dir->untracked[dir->untracked_nr++] = xstrdup(name); +} + +static int valid_cached_dir(struct dir_struct *dir, + struct untracked_cache_dir *untracked, + struct strbuf *path, + int check_only) +{ + struct stat st; + + if (!untracked) + return 0; + + if (stat(path->len ? path->buf : ".", &st)) { + invalidate_directory(dir->untracked, untracked); + memset(&untracked->stat_data, 0, sizeof(untracked->stat_data)); + return 0; + } + if (!untracked->valid || + match_stat_data_racy(&the_index, &untracked->stat_data, &st)) { + if (untracked->valid) + invalidate_directory(dir->untracked, untracked); + fill_stat_data(&untracked->stat_data, &st); + return 0; + } + + if (untracked->check_only != !!check_only) { + invalidate_directory(dir->untracked, untracked); + return 0; + } + + /* + * prep_exclude will be called eventually on this directory, + * but it's called much later in last_exclude_matching(). We + * need it now to determine the validity of the cache for this + * path. The next calls will be nearly no-op, the way + * prep_exclude() is designed. + */ + if (path->len && path->buf[path->len - 1] != '/') { + strbuf_addch(path, '/'); + prep_exclude(dir, path->buf, path->len); + strbuf_setlen(path, path->len - 1); + } else + prep_exclude(dir, path->buf, path->len); + + /* hopefully prep_exclude() haven't invalidated this entry... */ + return untracked->valid; +} + +static int open_cached_dir(struct cached_dir *cdir, + struct dir_struct *dir, + struct untracked_cache_dir *untracked, + struct strbuf *path, + int check_only) +{ + memset(cdir, 0, sizeof(*cdir)); + cdir->untracked = untracked; + if (valid_cached_dir(dir, untracked, path, check_only)) + return 0; + cdir->fdir = opendir(path->len ? path->buf : "."); + if (dir->untracked) + dir->untracked->dir_opened++; + if (!cdir->fdir) + return -1; + return 0; +} + +static int read_cached_dir(struct cached_dir *cdir) +{ + if (cdir->fdir) { + cdir->de = readdir(cdir->fdir); + if (!cdir->de) + return -1; + return 0; + } + while (cdir->nr_dirs < cdir->untracked->dirs_nr) { + struct untracked_cache_dir *d = cdir->untracked->dirs[cdir->nr_dirs]; + if (!d->recurse) { + cdir->nr_dirs++; + continue; + } + cdir->ucd = d; + cdir->nr_dirs++; + return 0; + } + cdir->ucd = NULL; + if (cdir->nr_files < cdir->untracked->untracked_nr) { + struct untracked_cache_dir *d = cdir->untracked; + cdir->file = d->untracked[cdir->nr_files++]; + return 0; + } + return -1; +} + +static void close_cached_dir(struct cached_dir *cdir) +{ + if (cdir->fdir) + closedir(cdir->fdir); + /* + * We have gone through this directory and found no untracked + * entries. Mark it valid. + */ + if (cdir->untracked) { + cdir->untracked->valid = 1; + cdir->untracked->recurse = 1; + } +} + +/* + * Read a directory tree. We currently ignore anything but + * directories, regular files and symlinks. That's because git + * doesn't handle them at all yet. Maybe that will change some + * day. + * + * Also, we ignore the name ".git" (even if it is not a directory). + * That likely will not change. + * + * Returns the most significant path_treatment value encountered in the scan. + */ +static enum path_treatment read_directory_recursive(struct dir_struct *dir, + const char *base, int baselen, + struct untracked_cache_dir *untracked, int check_only, + const struct path_simplify *simplify) +{ + struct cached_dir cdir; + enum path_treatment state, subdir_state, dir_state = path_none; + struct strbuf path = STRBUF_INIT; + + strbuf_add(&path, base, baselen); + + if (open_cached_dir(&cdir, dir, untracked, &path, check_only)) + goto out; + + if (untracked) + untracked->check_only = !!check_only; + + while (!read_cached_dir(&cdir)) { + /* check how the file or directory should be treated */ + state = treat_path(dir, untracked, &cdir, &path, baselen, simplify); + + if (state > dir_state) + dir_state = state; + + /* recurse into subdir if instructed by treat_path */ + if (state == path_recurse) { + struct untracked_cache_dir *ud; + ud = lookup_untracked(dir->untracked, untracked, + path.buf + baselen, + path.len - baselen); + subdir_state = + read_directory_recursive(dir, path.buf, path.len, + ud, check_only, simplify); + if (subdir_state > dir_state) + dir_state = subdir_state; + } + + if (check_only) { + /* abort early if maximum state has been reached */ + if (dir_state == path_untracked) { + if (cdir.fdir) + add_untracked(untracked, path.buf + baselen); + break; + } + /* skip the dir_add_* part */ + continue; + } + + /* add the path to the appropriate result list */ + switch (state) { + case path_excluded: + if (dir->flags & DIR_SHOW_IGNORED) + dir_add_name(dir, path.buf, path.len); + else if ((dir->flags & DIR_SHOW_IGNORED_TOO) || + ((dir->flags & DIR_COLLECT_IGNORED) && + exclude_matches_pathspec(path.buf, path.len, + simplify))) + dir_add_ignored(dir, path.buf, path.len); + break; + + case path_untracked: + if (dir->flags & DIR_SHOW_IGNORED) + break; + dir_add_name(dir, path.buf, path.len); + if (cdir.fdir) + add_untracked(untracked, path.buf + baselen); + break; + + default: + break; + } + } + close_cached_dir(&cdir); + out: + strbuf_release(&path); + + return dir_state; +} + +static int cmp_name(const void *p1, const void *p2) +{ + const struct dir_entry *e1 = *(const struct dir_entry **)p1; + const struct dir_entry *e2 = *(const struct dir_entry **)p2; + + return name_compare(e1->name, e1->len, e2->name, e2->len); +} + +static struct path_simplify *create_simplify(const char **pathspec) +{ + int nr, alloc = 0; + struct path_simplify *simplify = NULL; + + if (!pathspec) + return NULL; + + for (nr = 0 ; ; nr++) { + const char *match; + ALLOC_GROW(simplify, nr + 1, alloc); + match = *pathspec++; + if (!match) + break; + simplify[nr].path = match; + simplify[nr].len = simple_length(match); + } + simplify[nr].path = NULL; + simplify[nr].len = 0; + return simplify; +} + +static void free_simplify(struct path_simplify *simplify) +{ + free(simplify); +} + +static int treat_leading_path(struct dir_struct *dir, + const char *path, int len, + const struct path_simplify *simplify) +{ + struct strbuf sb = STRBUF_INIT; + int baselen, rc = 0; + const char *cp; + int old_flags = dir->flags; + + while (len && path[len - 1] == '/') + len--; + if (!len) + return 1; + baselen = 0; + dir->flags &= ~DIR_SHOW_OTHER_DIRECTORIES; + while (1) { + cp = path + baselen + !!baselen; + cp = memchr(cp, '/', path + len - cp); + if (!cp) + baselen = len; + else + baselen = cp - path; + strbuf_setlen(&sb, 0); + strbuf_add(&sb, path, baselen); + if (!is_directory(sb.buf)) + break; + if (simplify_away(sb.buf, sb.len, simplify)) + break; + if (treat_one_path(dir, NULL, &sb, baselen, simplify, + DT_DIR, NULL) == path_none) + break; /* do not recurse into it */ + if (len <= baselen) { + rc = 1; + break; /* finished checking */ + } + } + strbuf_release(&sb); + dir->flags = old_flags; + return rc; +} + +static const char *get_ident_string(void) +{ + static struct strbuf sb = STRBUF_INIT; + struct utsname uts; + + if (sb.len) + return sb.buf; + if (uname(&uts) < 0) + die_errno(_("failed to get kernel name and information")); + strbuf_addf(&sb, "Location %s, system %s", get_git_work_tree(), + uts.sysname); + return sb.buf; +} + +static int ident_in_untracked(const struct untracked_cache *uc) +{ + /* + * Previous git versions may have saved many NUL separated + * strings in the "ident" field, but it is insane to manage + * many locations, so just take care of the first one. + */ + + return !strcmp(uc->ident.buf, get_ident_string()); +} + +static void set_untracked_ident(struct untracked_cache *uc) +{ + strbuf_reset(&uc->ident); + strbuf_addstr(&uc->ident, get_ident_string()); + + /* + * This strbuf used to contain a list of NUL separated + * strings, so save NUL too for backward compatibility. + */ + strbuf_addch(&uc->ident, 0); +} + +static void new_untracked_cache(struct index_state *istate) +{ + struct untracked_cache *uc = xcalloc(1, sizeof(*uc)); + strbuf_init(&uc->ident, 100); + uc->exclude_per_dir = ".gitignore"; + /* should be the same flags used by git-status */ + uc->dir_flags = DIR_SHOW_OTHER_DIRECTORIES | DIR_HIDE_EMPTY_DIRECTORIES; + set_untracked_ident(uc); + istate->untracked = uc; + istate->cache_changed |= UNTRACKED_CHANGED; +} + +void add_untracked_cache(struct index_state *istate) +{ + if (!istate->untracked) { + new_untracked_cache(istate); + } else { + if (!ident_in_untracked(istate->untracked)) { + free_untracked_cache(istate->untracked); + new_untracked_cache(istate); + } + } +} + +void remove_untracked_cache(struct index_state *istate) +{ + if (istate->untracked) { + free_untracked_cache(istate->untracked); + istate->untracked = NULL; + istate->cache_changed |= UNTRACKED_CHANGED; + } +} + +static struct untracked_cache_dir *validate_untracked_cache(struct dir_struct *dir, + int base_len, + const struct pathspec *pathspec) +{ + struct untracked_cache_dir *root; + + if (!dir->untracked || getenv("GIT_DISABLE_UNTRACKED_CACHE")) + return NULL; + + /* + * We only support $GIT_DIR/info/exclude and core.excludesfile + * as the global ignore rule files. Any other additions + * (e.g. from command line) invalidate the cache. This + * condition also catches running setup_standard_excludes() + * before setting dir->untracked! + */ + if (dir->unmanaged_exclude_files) + return NULL; + + /* + * Optimize for the main use case only: whole-tree git + * status. More work involved in treat_leading_path() if we + * use cache on just a subset of the worktree. pathspec + * support could make the matter even worse. + */ + if (base_len || (pathspec && pathspec->nr)) + return NULL; + + /* Different set of flags may produce different results */ + if (dir->flags != dir->untracked->dir_flags || + /* + * See treat_directory(), case index_nonexistent. Without + * this flag, we may need to also cache .git file content + * for the resolve_gitlink_ref() call, which we don't. + */ + !(dir->flags & DIR_SHOW_OTHER_DIRECTORIES) || + /* We don't support collecting ignore files */ + (dir->flags & (DIR_SHOW_IGNORED | DIR_SHOW_IGNORED_TOO | + DIR_COLLECT_IGNORED))) + return NULL; + + /* + * If we use .gitignore in the cache and now you change it to + * .gitexclude, everything will go wrong. + */ + if (dir->exclude_per_dir != dir->untracked->exclude_per_dir && + strcmp(dir->exclude_per_dir, dir->untracked->exclude_per_dir)) + return NULL; + + /* + * EXC_CMDL is not considered in the cache. If people set it, + * skip the cache. + */ + if (dir->exclude_list_group[EXC_CMDL].nr) + return NULL; + + if (!ident_in_untracked(dir->untracked)) { + warning(_("Untracked cache is disabled on this system or location.")); + return NULL; + } + + if (!dir->untracked->root) { + const int len = sizeof(*dir->untracked->root); + dir->untracked->root = xmalloc(len); + memset(dir->untracked->root, 0, len); + } + + /* Validate $GIT_DIR/info/exclude and core.excludesfile */ + root = dir->untracked->root; + if (hashcmp(dir->ss_info_exclude.sha1, + dir->untracked->ss_info_exclude.sha1)) { + invalidate_gitignore(dir->untracked, root); + dir->untracked->ss_info_exclude = dir->ss_info_exclude; + } + if (hashcmp(dir->ss_excludes_file.sha1, + dir->untracked->ss_excludes_file.sha1)) { + invalidate_gitignore(dir->untracked, root); + dir->untracked->ss_excludes_file = dir->ss_excludes_file; + } + + /* Make sure this directory is not dropped out at saving phase */ + root->recurse = 1; + return root; +} + +int read_directory(struct dir_struct *dir, const char *path, int len, const struct pathspec *pathspec) +{ + struct path_simplify *simplify; + struct untracked_cache_dir *untracked; + + /* + * Check out create_simplify() + */ + if (pathspec) + GUARD_PATHSPEC(pathspec, + PATHSPEC_FROMTOP | + PATHSPEC_MAXDEPTH | + PATHSPEC_LITERAL | + PATHSPEC_GLOB | + PATHSPEC_ICASE | + PATHSPEC_EXCLUDE); + + if (has_symlink_leading_path(path, len)) + return dir->nr; + + /* + * exclude patterns are treated like positive ones in + * create_simplify. Usually exclude patterns should be a + * subset of positive ones, which has no impacts on + * create_simplify(). + */ + simplify = create_simplify(pathspec ? pathspec->_raw : NULL); + untracked = validate_untracked_cache(dir, len, pathspec); + if (!untracked) + /* + * make sure untracked cache code path is disabled, + * e.g. prep_exclude() + */ + dir->untracked = NULL; + if (!len || treat_leading_path(dir, path, len, simplify)) + read_directory_recursive(dir, path, len, untracked, 0, simplify); + free_simplify(simplify); + qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name); + qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name); + if (dir->untracked) { + static struct trace_key trace_untracked_stats = TRACE_KEY_INIT(UNTRACKED_STATS); + trace_printf_key(&trace_untracked_stats, + "node creation: %u\n" + "gitignore invalidation: %u\n" + "directory invalidation: %u\n" + "opendir: %u\n", + dir->untracked->dir_created, + dir->untracked->gitignore_invalidated, + dir->untracked->dir_invalidated, + dir->untracked->dir_opened); + if (dir->untracked == the_index.untracked && + (dir->untracked->dir_opened || + dir->untracked->gitignore_invalidated || + dir->untracked->dir_invalidated)) + the_index.cache_changed |= UNTRACKED_CHANGED; + if (dir->untracked != the_index.untracked) { + free(dir->untracked); + dir->untracked = NULL; + } + } + return dir->nr; +} + +int file_exists(const char *f) +{ + struct stat sb; + return lstat(f, &sb) == 0; +} + +static int cmp_icase(char a, char b) +{ + if (a == b) + return 0; + if (ignore_case) + return toupper(a) - toupper(b); + return a - b; +} + +/* + * Given two normalized paths (a trailing slash is ok), if subdir is + * outside dir, return -1. Otherwise return the offset in subdir that + * can be used as relative path to dir. + */ +int dir_inside_of(const char *subdir, const char *dir) +{ + int offset = 0; + + assert(dir && subdir && *dir && *subdir); + + while (*dir && *subdir && !cmp_icase(*dir, *subdir)) { + dir++; + subdir++; + offset++; + } + + /* hel[p]/me vs hel[l]/yeah */ + if (*dir && *subdir) + return -1; + + if (!*subdir) + return !*dir ? offset : -1; /* same dir */ + + /* foo/[b]ar vs foo/[] */ + if (is_dir_sep(dir[-1])) + return is_dir_sep(subdir[-1]) ? offset : -1; + + /* foo[/]bar vs foo[] */ + return is_dir_sep(*subdir) ? offset + 1 : -1; +} + +int is_inside_dir(const char *dir) +{ + char *cwd; + int rc; + + if (!dir) + return 0; + + cwd = xgetcwd(); + rc = (dir_inside_of(cwd, dir) >= 0); + free(cwd); + return rc; +} + +int is_empty_dir(const char *path) +{ + DIR *dir = opendir(path); + struct dirent *e; + int ret = 1; + + if (!dir) + return 0; + + while ((e = readdir(dir)) != NULL) + if (!is_dot_or_dotdot(e->d_name)) { + ret = 0; + break; + } + + closedir(dir); + return ret; +} + +static int remove_dir_recurse(struct strbuf *path, int flag, int *kept_up) +{ + DIR *dir; + struct dirent *e; + int ret = 0, original_len = path->len, len, kept_down = 0; + int only_empty = (flag & REMOVE_DIR_EMPTY_ONLY); + int keep_toplevel = (flag & REMOVE_DIR_KEEP_TOPLEVEL); + unsigned char submodule_head[20]; + + if ((flag & REMOVE_DIR_KEEP_NESTED_GIT) && + !resolve_gitlink_ref(path->buf, "HEAD", submodule_head)) { + /* Do not descend and nuke a nested git work tree. */ + if (kept_up) + *kept_up = 1; + return 0; + } + + flag &= ~REMOVE_DIR_KEEP_TOPLEVEL; + dir = opendir(path->buf); + if (!dir) { + if (errno == ENOENT) + return keep_toplevel ? -1 : 0; + else if (errno == EACCES && !keep_toplevel) + /* + * An empty dir could be removable even if it + * is unreadable: + */ + return rmdir(path->buf); + else + return -1; + } + strbuf_complete(path, '/'); + + len = path->len; + while ((e = readdir(dir)) != NULL) { + struct stat st; + if (is_dot_or_dotdot(e->d_name)) + continue; + + strbuf_setlen(path, len); + strbuf_addstr(path, e->d_name); + if (lstat(path->buf, &st)) { + if (errno == ENOENT) + /* + * file disappeared, which is what we + * wanted anyway + */ + continue; + /* fall thru */ + } else if (S_ISDIR(st.st_mode)) { + if (!remove_dir_recurse(path, flag, &kept_down)) + continue; /* happy */ + } else if (!only_empty && + (!unlink(path->buf) || errno == ENOENT)) { + continue; /* happy, too */ + } + + /* path too long, stat fails, or non-directory still exists */ + ret = -1; + break; + } + closedir(dir); + + strbuf_setlen(path, original_len); + if (!ret && !keep_toplevel && !kept_down) + ret = (!rmdir(path->buf) || errno == ENOENT) ? 0 : -1; + else if (kept_up) + /* + * report the uplevel that it is not an error that we + * did not rmdir() our directory. + */ + *kept_up = !ret; + return ret; +} + +int remove_dir_recursively(struct strbuf *path, int flag) +{ + return remove_dir_recurse(path, flag, NULL); +} + +static GIT_PATH_FUNC(git_path_info_exclude, "info/exclude") + +void setup_standard_excludes(struct dir_struct *dir) +{ + const char *path; + + dir->exclude_per_dir = ".gitignore"; + + /* core.excludefile defaulting to $XDG_HOME/git/ignore */ + if (!excludes_file) + excludes_file = xdg_config_home("ignore"); + if (excludes_file && !access_or_warn(excludes_file, R_OK, 0)) + add_excludes_from_file_1(dir, excludes_file, + dir->untracked ? &dir->ss_excludes_file : NULL); + + /* per repository user preference */ + path = git_path_info_exclude(); + if (!access_or_warn(path, R_OK, 0)) + add_excludes_from_file_1(dir, path, + dir->untracked ? &dir->ss_info_exclude : NULL); +} + +int remove_path(const char *name) +{ + char *slash; + + if (unlink(name) && errno != ENOENT && errno != ENOTDIR) + return -1; + + slash = strrchr(name, '/'); + if (slash) { + char *dirs = xstrdup(name); + slash = dirs + (slash - name); + do { + *slash = '\0'; + } while (rmdir(dirs) == 0 && (slash = strrchr(dirs, '/'))); + free(dirs); + } + return 0; +} + +/* + * Frees memory within dir which was allocated for exclude lists and + * the exclude_stack. Does not free dir itself. + */ +void clear_directory(struct dir_struct *dir) +{ + int i, j; + struct exclude_list_group *group; + struct exclude_list *el; + struct exclude_stack *stk; + + for (i = EXC_CMDL; i <= EXC_FILE; i++) { + group = &dir->exclude_list_group[i]; + for (j = 0; j < group->nr; j++) { + el = &group->el[j]; + if (i == EXC_DIRS) + free((char *)el->src); + clear_exclude_list(el); + } + free(group->el); + } + + stk = dir->exclude_stack; + while (stk) { + struct exclude_stack *prev = stk->prev; + free(stk); + stk = prev; + } + strbuf_release(&dir->basebuf); +} + +struct ondisk_untracked_cache { + struct stat_data info_exclude_stat; + struct stat_data excludes_file_stat; + uint32_t dir_flags; + unsigned char info_exclude_sha1[20]; + unsigned char excludes_file_sha1[20]; + char exclude_per_dir[FLEX_ARRAY]; +}; + +#define ouc_size(len) (offsetof(struct ondisk_untracked_cache, exclude_per_dir) + len + 1) + +struct write_data { + int index; /* number of written untracked_cache_dir */ + struct ewah_bitmap *check_only; /* from untracked_cache_dir */ + struct ewah_bitmap *valid; /* from untracked_cache_dir */ + struct ewah_bitmap *sha1_valid; /* set if exclude_sha1 is not null */ + struct strbuf out; + struct strbuf sb_stat; + struct strbuf sb_sha1; +}; + +static void stat_data_to_disk(struct stat_data *to, const struct stat_data *from) +{ + to->sd_ctime.sec = htonl(from->sd_ctime.sec); + to->sd_ctime.nsec = htonl(from->sd_ctime.nsec); + to->sd_mtime.sec = htonl(from->sd_mtime.sec); + to->sd_mtime.nsec = htonl(from->sd_mtime.nsec); + to->sd_dev = htonl(from->sd_dev); + to->sd_ino = htonl(from->sd_ino); + to->sd_uid = htonl(from->sd_uid); + to->sd_gid = htonl(from->sd_gid); + to->sd_size = htonl(from->sd_size); +} + +static void write_one_dir(struct untracked_cache_dir *untracked, + struct write_data *wd) +{ + struct stat_data stat_data; + struct strbuf *out = &wd->out; + unsigned char intbuf[16]; + unsigned int intlen, value; + int i = wd->index++; + + /* + * untracked_nr should be reset whenever valid is clear, but + * for safety.. + */ + if (!untracked->valid) { + untracked->untracked_nr = 0; + untracked->check_only = 0; + } + + if (untracked->check_only) + ewah_set(wd->check_only, i); + if (untracked->valid) { + ewah_set(wd->valid, i); + stat_data_to_disk(&stat_data, &untracked->stat_data); + strbuf_add(&wd->sb_stat, &stat_data, sizeof(stat_data)); + } + if (!is_null_sha1(untracked->exclude_sha1)) { + ewah_set(wd->sha1_valid, i); + strbuf_add(&wd->sb_sha1, untracked->exclude_sha1, 20); + } + + intlen = encode_varint(untracked->untracked_nr, intbuf); + strbuf_add(out, intbuf, intlen); + + /* skip non-recurse directories */ + for (i = 0, value = 0; i < untracked->dirs_nr; i++) + if (untracked->dirs[i]->recurse) + value++; + intlen = encode_varint(value, intbuf); + strbuf_add(out, intbuf, intlen); + + strbuf_add(out, untracked->name, strlen(untracked->name) + 1); + + for (i = 0; i < untracked->untracked_nr; i++) + strbuf_add(out, untracked->untracked[i], + strlen(untracked->untracked[i]) + 1); + + for (i = 0; i < untracked->dirs_nr; i++) + if (untracked->dirs[i]->recurse) + write_one_dir(untracked->dirs[i], wd); +} + +void write_untracked_extension(struct strbuf *out, struct untracked_cache *untracked) +{ + struct ondisk_untracked_cache *ouc; + struct write_data wd; + unsigned char varbuf[16]; + int varint_len; + size_t len = strlen(untracked->exclude_per_dir); + + FLEX_ALLOC_MEM(ouc, exclude_per_dir, untracked->exclude_per_dir, len); + stat_data_to_disk(&ouc->info_exclude_stat, &untracked->ss_info_exclude.stat); + stat_data_to_disk(&ouc->excludes_file_stat, &untracked->ss_excludes_file.stat); + hashcpy(ouc->info_exclude_sha1, untracked->ss_info_exclude.sha1); + hashcpy(ouc->excludes_file_sha1, untracked->ss_excludes_file.sha1); + ouc->dir_flags = htonl(untracked->dir_flags); + + varint_len = encode_varint(untracked->ident.len, varbuf); + strbuf_add(out, varbuf, varint_len); + strbuf_addbuf(out, &untracked->ident); + + strbuf_add(out, ouc, ouc_size(len)); + free(ouc); + ouc = NULL; + + if (!untracked->root) { + varint_len = encode_varint(0, varbuf); + strbuf_add(out, varbuf, varint_len); + return; + } + + wd.index = 0; + wd.check_only = ewah_new(); + wd.valid = ewah_new(); + wd.sha1_valid = ewah_new(); + strbuf_init(&wd.out, 1024); + strbuf_init(&wd.sb_stat, 1024); + strbuf_init(&wd.sb_sha1, 1024); + write_one_dir(untracked->root, &wd); + + varint_len = encode_varint(wd.index, varbuf); + strbuf_add(out, varbuf, varint_len); + strbuf_addbuf(out, &wd.out); + ewah_serialize_strbuf(wd.valid, out); + ewah_serialize_strbuf(wd.check_only, out); + ewah_serialize_strbuf(wd.sha1_valid, out); + strbuf_addbuf(out, &wd.sb_stat); + strbuf_addbuf(out, &wd.sb_sha1); + strbuf_addch(out, '\0'); /* safe guard for string lists */ + + ewah_free(wd.valid); + ewah_free(wd.check_only); + ewah_free(wd.sha1_valid); + strbuf_release(&wd.out); + strbuf_release(&wd.sb_stat); + strbuf_release(&wd.sb_sha1); +} + +static void free_untracked(struct untracked_cache_dir *ucd) +{ + int i; + if (!ucd) + return; + for (i = 0; i < ucd->dirs_nr; i++) + free_untracked(ucd->dirs[i]); + for (i = 0; i < ucd->untracked_nr; i++) + free(ucd->untracked[i]); + free(ucd->untracked); + free(ucd->dirs); + free(ucd); +} + +void free_untracked_cache(struct untracked_cache *uc) +{ + if (uc) + free_untracked(uc->root); + free(uc); +} + +struct read_data { + int index; + struct untracked_cache_dir **ucd; + struct ewah_bitmap *check_only; + struct ewah_bitmap *valid; + struct ewah_bitmap *sha1_valid; + const unsigned char *data; + const unsigned char *end; +}; + +static void stat_data_from_disk(struct stat_data *to, const struct stat_data *from) +{ + to->sd_ctime.sec = get_be32(&from->sd_ctime.sec); + to->sd_ctime.nsec = get_be32(&from->sd_ctime.nsec); + to->sd_mtime.sec = get_be32(&from->sd_mtime.sec); + to->sd_mtime.nsec = get_be32(&from->sd_mtime.nsec); + to->sd_dev = get_be32(&from->sd_dev); + to->sd_ino = get_be32(&from->sd_ino); + to->sd_uid = get_be32(&from->sd_uid); + to->sd_gid = get_be32(&from->sd_gid); + to->sd_size = get_be32(&from->sd_size); +} + +static int read_one_dir(struct untracked_cache_dir **untracked_, + struct read_data *rd) +{ + struct untracked_cache_dir ud, *untracked; + const unsigned char *next, *data = rd->data, *end = rd->end; + unsigned int value; + int i, len; + + memset(&ud, 0, sizeof(ud)); + + next = data; + value = decode_varint(&next); + if (next > end) + return -1; + ud.recurse = 1; + ud.untracked_alloc = value; + ud.untracked_nr = value; + if (ud.untracked_nr) + ALLOC_ARRAY(ud.untracked, ud.untracked_nr); + data = next; + + next = data; + ud.dirs_alloc = ud.dirs_nr = decode_varint(&next); + if (next > end) + return -1; + ALLOC_ARRAY(ud.dirs, ud.dirs_nr); + data = next; + + len = strlen((const char *)data); + next = data + len + 1; + if (next > rd->end) + return -1; + *untracked_ = untracked = xmalloc(st_add(sizeof(*untracked), len)); + memcpy(untracked, &ud, sizeof(ud)); + memcpy(untracked->name, data, len + 1); + data = next; + + for (i = 0; i < untracked->untracked_nr; i++) { + len = strlen((const char *)data); + next = data + len + 1; + if (next > rd->end) + return -1; + untracked->untracked[i] = xstrdup((const char*)data); + data = next; + } + + rd->ucd[rd->index++] = untracked; + rd->data = data; + + for (i = 0; i < untracked->dirs_nr; i++) { + len = read_one_dir(untracked->dirs + i, rd); + if (len < 0) + return -1; + } + return 0; +} + +static void set_check_only(size_t pos, void *cb) +{ + struct read_data *rd = cb; + struct untracked_cache_dir *ud = rd->ucd[pos]; + ud->check_only = 1; +} + +static void read_stat(size_t pos, void *cb) +{ + struct read_data *rd = cb; + struct untracked_cache_dir *ud = rd->ucd[pos]; + if (rd->data + sizeof(struct stat_data) > rd->end) { + rd->data = rd->end + 1; + return; + } + stat_data_from_disk(&ud->stat_data, (struct stat_data *)rd->data); + rd->data += sizeof(struct stat_data); + ud->valid = 1; +} + +static void read_sha1(size_t pos, void *cb) +{ + struct read_data *rd = cb; + struct untracked_cache_dir *ud = rd->ucd[pos]; + if (rd->data + 20 > rd->end) { + rd->data = rd->end + 1; + return; + } + hashcpy(ud->exclude_sha1, rd->data); + rd->data += 20; +} + +static void load_sha1_stat(struct sha1_stat *sha1_stat, + const struct stat_data *stat, + const unsigned char *sha1) +{ + stat_data_from_disk(&sha1_stat->stat, stat); + hashcpy(sha1_stat->sha1, sha1); + sha1_stat->valid = 1; +} + +struct untracked_cache *read_untracked_extension(const void *data, unsigned long sz) +{ + const struct ondisk_untracked_cache *ouc; + struct untracked_cache *uc; + struct read_data rd; + const unsigned char *next = data, *end = (const unsigned char *)data + sz; + const char *ident; + int ident_len, len; + + if (sz <= 1 || end[-1] != '\0') + return NULL; + end--; + + ident_len = decode_varint(&next); + if (next + ident_len > end) + return NULL; + ident = (const char *)next; + next += ident_len; + + ouc = (const struct ondisk_untracked_cache *)next; + if (next + ouc_size(0) > end) + return NULL; + + uc = xcalloc(1, sizeof(*uc)); + strbuf_init(&uc->ident, ident_len); + strbuf_add(&uc->ident, ident, ident_len); + load_sha1_stat(&uc->ss_info_exclude, &ouc->info_exclude_stat, + ouc->info_exclude_sha1); + load_sha1_stat(&uc->ss_excludes_file, &ouc->excludes_file_stat, + ouc->excludes_file_sha1); + uc->dir_flags = get_be32(&ouc->dir_flags); + uc->exclude_per_dir = xstrdup(ouc->exclude_per_dir); + /* NUL after exclude_per_dir is covered by sizeof(*ouc) */ + next += ouc_size(strlen(ouc->exclude_per_dir)); + if (next >= end) + goto done2; + + len = decode_varint(&next); + if (next > end || len == 0) + goto done2; + + rd.valid = ewah_new(); + rd.check_only = ewah_new(); + rd.sha1_valid = ewah_new(); + rd.data = next; + rd.end = end; + rd.index = 0; + ALLOC_ARRAY(rd.ucd, len); + + if (read_one_dir(&uc->root, &rd) || rd.index != len) + goto done; + + next = rd.data; + len = ewah_read_mmap(rd.valid, next, end - next); + if (len < 0) + goto done; + + next += len; + len = ewah_read_mmap(rd.check_only, next, end - next); + if (len < 0) + goto done; + + next += len; + len = ewah_read_mmap(rd.sha1_valid, next, end - next); + if (len < 0) + goto done; + + ewah_each_bit(rd.check_only, set_check_only, &rd); + rd.data = next + len; + ewah_each_bit(rd.valid, read_stat, &rd); + ewah_each_bit(rd.sha1_valid, read_sha1, &rd); + next = rd.data; + +done: + free(rd.ucd); + ewah_free(rd.valid); + ewah_free(rd.check_only); + ewah_free(rd.sha1_valid); +done2: + if (next != end) { + free_untracked_cache(uc); + uc = NULL; + } + return uc; +} + +static void invalidate_one_directory(struct untracked_cache *uc, + struct untracked_cache_dir *ucd) +{ + uc->dir_invalidated++; + ucd->valid = 0; + ucd->untracked_nr = 0; +} + +/* + * Normally when an entry is added or removed from a directory, + * invalidating that directory is enough. No need to touch its + * ancestors. When a directory is shown as "foo/bar/" in git-status + * however, deleting or adding an entry may have cascading effect. + * + * Say the "foo/bar/file" has become untracked, we need to tell the + * untracked_cache_dir of "foo" that "bar/" is not an untracked + * directory any more (because "bar" is managed by foo as an untracked + * "file"). + * + * Similarly, if "foo/bar/file" moves from untracked to tracked and it + * was the last untracked entry in the entire "foo", we should show + * "foo/" instead. Which means we have to invalidate past "bar" up to + * "foo". + * + * This function traverses all directories from root to leaf. If there + * is a chance of one of the above cases happening, we invalidate back + * to root. Otherwise we just invalidate the leaf. There may be a more + * sophisticated way than checking for SHOW_OTHER_DIRECTORIES to + * detect these cases and avoid unnecessary invalidation, for example, + * checking for the untracked entry named "bar/" in "foo", but for now + * stick to something safe and simple. + */ +static int invalidate_one_component(struct untracked_cache *uc, + struct untracked_cache_dir *dir, + const char *path, int len) +{ + const char *rest = strchr(path, '/'); + + if (rest) { + int component_len = rest - path; + struct untracked_cache_dir *d = + lookup_untracked(uc, dir, path, component_len); + int ret = + invalidate_one_component(uc, d, rest + 1, + len - (component_len + 1)); + if (ret) + invalidate_one_directory(uc, dir); + return ret; + } + + invalidate_one_directory(uc, dir); + return uc->dir_flags & DIR_SHOW_OTHER_DIRECTORIES; +} + +void untracked_cache_invalidate_path(struct index_state *istate, + const char *path) +{ + if (!istate->untracked || !istate->untracked->root) + return; + invalidate_one_component(istate->untracked, istate->untracked->root, + path, strlen(path)); +} + +void untracked_cache_remove_from_index(struct index_state *istate, + const char *path) +{ + untracked_cache_invalidate_path(istate, path); +} + +void untracked_cache_add_to_index(struct index_state *istate, + const char *path) +{ + untracked_cache_invalidate_path(istate, path); +} |