diff options
| -rw-r--r-- | Documentation/technical/api-string-list.txt | 8 | ||||
| -rw-r--r-- | abspath.c | 105 | ||||
| -rw-r--r-- | cache.h | 3 | ||||
| -rw-r--r-- | path.c | 46 | ||||
| -rw-r--r-- | setup.c | 34 | ||||
| -rw-r--r-- | string-list.c | 20 | ||||
| -rw-r--r-- | string-list.h | 9 | ||||
| -rwxr-xr-x | t/t0060-path-utils.sh | 41 | ||||
| -rwxr-xr-x | t/t0063-string-list.sh | 30 | ||||
| -rw-r--r-- | test-path-utils.c | 51 | ||||
| -rw-r--r-- | test-string-list.c | 20 |
11 files changed, 202 insertions, 165 deletions
diff --git a/Documentation/technical/api-string-list.txt b/Documentation/technical/api-string-list.txt index 7386bca..20be348 100644 --- a/Documentation/technical/api-string-list.txt +++ b/Documentation/technical/api-string-list.txt @@ -82,14 +82,6 @@ Functions call free() on the util members of any items that have to be deleted. Preserve the order of the items that are retained. -`string_list_longest_prefix`:: - - Return the longest string within a string_list that is a - prefix (in the sense of prefixcmp()) of the specified string, - or NULL if no such prefix exists. This function does not - require the string_list to be sorted (it does a linear - search). - `print_string_list`:: Dump a string_list to stdout, useful mainly for debugging purposes. It @@ -15,16 +15,34 @@ int is_directory(const char *path) #define MAXDEPTH 5 /* - * Use this to get the real path, i.e. resolve links. If you want an - * absolute path but don't mind links, use absolute_path. + * Return the real path (i.e., absolute path, with symlinks resolved + * and extra slashes removed) equivalent to the specified path. (If + * you want an absolute path but don't mind links, use + * absolute_path().) The return value is a pointer to a static + * buffer. + * + * The input and all intermediate paths must be shorter than MAX_PATH. + * The directory part of path (i.e., everything up to the last + * dir_sep) must denote a valid, existing directory, but the last + * component need not exist. If die_on_error is set, then die with an + * informative error message if there is a problem. Otherwise, return + * NULL on errors (without generating any output). * * If path is our buffer, then return path, as it's already what the * user wants. */ -const char *real_path(const char *path) +static const char *real_path_internal(const char *path, int die_on_error) { static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; + char *retval = NULL; + + /* + * If we have to temporarily chdir(), store the original CWD + * here so that we can chdir() back to it at the end of the + * function: + */ char cwd[1024] = ""; + int buf_index = 1; int depth = MAXDEPTH; @@ -35,11 +53,19 @@ const char *real_path(const char *path) if (path == buf || path == next_buf) return path; - if (!*path) - die("The empty string is not a valid path"); + if (!*path) { + if (die_on_error) + die("The empty string is not a valid path"); + else + goto error_out; + } - if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) - die ("Too long path: %.*s", 60, path); + if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) { + if (die_on_error) + die("Too long path: %.*s", 60, path); + else + goto error_out; + } while (depth--) { if (!is_directory(buf)) { @@ -54,20 +80,36 @@ const char *real_path(const char *path) } if (*buf) { - if (!*cwd && !getcwd(cwd, sizeof(cwd))) - die_errno ("Could not get current working directory"); + if (!*cwd && !getcwd(cwd, sizeof(cwd))) { + if (die_on_error) + die_errno("Could not get current working directory"); + else + goto error_out; + } - if (chdir(buf)) - die_errno ("Could not switch to '%s'", buf); + if (chdir(buf)) { + if (die_on_error) + die_errno("Could not switch to '%s'", buf); + else + goto error_out; + } + } + if (!getcwd(buf, PATH_MAX)) { + if (die_on_error) + die_errno("Could not get current working directory"); + else + goto error_out; } - if (!getcwd(buf, PATH_MAX)) - die_errno ("Could not get current working directory"); if (last_elem) { size_t len = strlen(buf); - if (len + strlen(last_elem) + 2 > PATH_MAX) - die ("Too long path name: '%s/%s'", - buf, last_elem); + if (len + strlen(last_elem) + 2 > PATH_MAX) { + if (die_on_error) + die("Too long path name: '%s/%s'", + buf, last_elem); + else + goto error_out; + } if (len && !is_dir_sep(buf[len-1])) buf[len++] = '/'; strcpy(buf + len, last_elem); @@ -77,10 +119,18 @@ const char *real_path(const char *path) if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) { ssize_t len = readlink(buf, next_buf, PATH_MAX); - if (len < 0) - die_errno ("Invalid symlink '%s'", buf); - if (PATH_MAX <= len) - die("symbolic link too long: %s", buf); + if (len < 0) { + if (die_on_error) + die_errno("Invalid symlink '%s'", buf); + else + goto error_out; + } + if (PATH_MAX <= len) { + if (die_on_error) + die("symbolic link too long: %s", buf); + else + goto error_out; + } next_buf[len] = '\0'; buf = next_buf; buf_index = 1 - buf_index; @@ -89,10 +139,23 @@ const char *real_path(const char *path) break; } + retval = buf; +error_out: + free(last_elem); if (*cwd && chdir(cwd)) die_errno ("Could not change back to '%s'", cwd); - return buf; + return retval; +} + +const char *real_path(const char *path) +{ + return real_path_internal(path, 1); +} + +const char *real_path_if_valid(const char *path) +{ + return real_path_internal(path, 0); } static const char *get_pwd_cwd(void) @@ -714,10 +714,11 @@ static inline int is_absolute_path(const char *path) } int is_directory(const char *); const char *real_path(const char *path); +const char *real_path_if_valid(const char *path); const char *absolute_path(const char *path); const char *relative_path(const char *abs, const char *base); int normalize_path_copy(char *dst, const char *src); -int longest_ancestor_length(const char *path, const char *prefix_list); +int longest_ancestor_length(const char *path, struct string_list *prefixes); char *strip_path_suffix(const char *path, const char *suffix); int daemon_avoid_alias(const char *path); int offset_1st_component(const char *path); @@ -12,6 +12,7 @@ */ #include "cache.h" #include "strbuf.h" +#include "string-list.h" static char bad_path[] = "/bad-path/"; @@ -569,43 +570,38 @@ int normalize_path_copy(char *dst, const char *src) /* * path = Canonical absolute path - * prefix_list = Colon-separated list of absolute paths + * prefixes = string_list containing normalized, absolute paths without + * trailing slashes (except for the root directory, which is denoted by "/"). * - * Determines, for each path in prefix_list, whether the "prefix" really + * Determines, for each path in prefixes, whether the "prefix" * is an ancestor directory of path. Returns the length of the longest * ancestor directory, excluding any trailing slashes, or -1 if no prefix - * is an ancestor. (Note that this means 0 is returned if prefix_list is - * "/".) "/foo" is not considered an ancestor of "/foobar". Directories + * is an ancestor. (Note that this means 0 is returned if prefixes is + * ["/"].) "/foo" is not considered an ancestor of "/foobar". Directories * are not considered to be their own ancestors. path must be in a * canonical form: empty components, or "." or ".." components are not - * allowed. prefix_list may be null, which is like "". + * allowed. */ -int longest_ancestor_length(const char *path, const char *prefix_list) +int longest_ancestor_length(const char *path, struct string_list *prefixes) { - char buf[PATH_MAX+1]; - const char *ceil, *colon; - int len, max_len = -1; + int i, max_len = -1; - if (prefix_list == NULL || !strcmp(path, "/")) + if (!strcmp(path, "/")) return -1; - for (colon = ceil = prefix_list; *colon; ceil = colon+1) { - for (colon = ceil; *colon && *colon != PATH_SEP; colon++); - len = colon - ceil; - if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil)) - continue; - strlcpy(buf, ceil, len+1); - if (normalize_path_copy(buf, buf) < 0) - continue; - len = strlen(buf); - if (len > 0 && buf[len-1] == '/') - buf[--len] = '\0'; + for (i = 0; i < prefixes->nr; i++) { + const char *ceil = prefixes->items[i].string; + int len = strlen(ceil); - if (!strncmp(path, buf, len) && - path[len] == '/' && - len > max_len) { + if (len == 1 && ceil[0] == '/') + len = 0; /* root matches anything, with length 0 */ + else if (!strncmp(path, ceil, len) && path[len] == '/') + ; /* match of length len */ + else + continue; /* no match */ + + if (len > max_len) max_len = len; - } } return max_len; @@ -1,5 +1,6 @@ #include "cache.h" #include "dir.h" +#include "string-list.h" static int inside_git_dir = -1; static int inside_work_tree = -1; @@ -621,16 +622,38 @@ static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_ } /* + * A "string_list_each_func_t" function that canonicalizes an entry + * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or + * discards it if unusable. + */ +static int canonicalize_ceiling_entry(struct string_list_item *item, + void *unused) +{ + char *ceil = item->string; + const char *real_path; + + if (!*ceil || !is_absolute_path(ceil)) + return 0; + real_path = real_path_if_valid(ceil); + if (!real_path) + return 0; + free(item->string); + item->string = xstrdup(real_path); + return 1; +} + +/* * We cannot decide in this function whether we are in the work tree or * not, since the config can only be read _after_ this function was called. */ static const char *setup_git_directory_gently_1(int *nongit_ok) { const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); + struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; static char cwd[PATH_MAX+1]; const char *gitdirenv, *ret; char *gitfile; - int len, offset, offset_parent, ceil_offset; + int len, offset, offset_parent, ceil_offset = -1; dev_t current_device = 0; int one_filesystem = 1; @@ -655,7 +678,14 @@ static const char *setup_git_directory_gently_1(int *nongit_ok) if (gitdirenv) return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok); - ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs); + if (env_ceiling_dirs) { + string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); + filter_string_list(&ceiling_dirs, 0, + canonicalize_ceiling_entry, NULL); + ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs); + string_list_clear(&ceiling_dirs, 0); + } + if (ceil_offset < 0 && has_dos_drive_prefix(cwd)) ceil_offset = 1; diff --git a/string-list.c b/string-list.c index 397e6cf..480173f 100644 --- a/string-list.c +++ b/string-list.c @@ -145,26 +145,6 @@ void string_list_remove_empty_items(struct string_list *list, int free_util) { filter_string_list(list, free_util, item_is_not_empty, NULL); } -char *string_list_longest_prefix(const struct string_list *prefixes, - const char *string) -{ - int i, max_len = -1; - char *retval = NULL; - - for (i = 0; i < prefixes->nr; i++) { - char *prefix = prefixes->items[i].string; - if (!prefixcmp(string, prefix)) { - int len = strlen(prefix); - if (len > max_len) { - retval = prefix; - max_len = len; - } - } - } - - return retval; -} - void string_list_clear(struct string_list *list, int free_util) { if (list->items) { diff --git a/string-list.h b/string-list.h index c50b0d0..db12848 100644 --- a/string-list.h +++ b/string-list.h @@ -45,15 +45,6 @@ void filter_string_list(struct string_list *list, int free_util, */ void string_list_remove_empty_items(struct string_list *list, int free_util); -/* - * Return the longest string in prefixes that is a prefix (in the - * sense of prefixcmp()) of string, or NULL if no such prefix exists. - * This function does not require the string_list to be sorted (it - * does a linear search). - */ -char *string_list_longest_prefix(const struct string_list *prefixes, const char *string); - - /* Use these functions only on sorted lists: */ int string_list_has_string(const struct string_list *list, const char *string); int string_list_find_insert_index(const struct string_list *list, const char *string, diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh index 4ef2345..09a42a4 100755 --- a/t/t0060-path-utils.sh +++ b/t/t0060-path-utils.sh @@ -93,47 +93,32 @@ norm_path /d1/s1//../s2/../../d2 /d2 POSIX norm_path /d1/.../d2 /d1/.../d2 POSIX norm_path /d1/..././../d2 /d1/d2 POSIX -ancestor / "" -1 ancestor / / -1 -ancestor /foo "" -1 -ancestor /foo : -1 -ancestor /foo ::. -1 -ancestor /foo ::..:: -1 ancestor /foo / 0 ancestor /foo /fo -1 ancestor /foo /foo -1 -ancestor /foo /foo/ -1 ancestor /foo /bar -1 -ancestor /foo /bar/ -1 ancestor /foo /foo/bar -1 -ancestor /foo /foo:/bar/ -1 -ancestor /foo /foo/:/bar/ -1 -ancestor /foo /foo::/bar/ -1 -ancestor /foo /:/foo:/bar/ 0 -ancestor /foo /foo:/:/bar/ 0 -ancestor /foo /:/bar/:/foo 0 -ancestor /foo/bar "" -1 +ancestor /foo /foo:/bar -1 +ancestor /foo /:/foo:/bar 0 +ancestor /foo /foo:/:/bar 0 +ancestor /foo /:/bar:/foo 0 ancestor /foo/bar / 0 ancestor /foo/bar /fo -1 -ancestor /foo/bar foo -1 ancestor /foo/bar /foo 4 -ancestor /foo/bar /foo/ 4 ancestor /foo/bar /foo/ba -1 ancestor /foo/bar /:/fo 0 ancestor /foo/bar /foo:/foo/ba 4 ancestor /foo/bar /bar -1 -ancestor /foo/bar /bar/ -1 -ancestor /foo/bar /fo: -1 -ancestor /foo/bar :/fo -1 -ancestor /foo/bar /foo:/bar/ 4 -ancestor /foo/bar /:/foo:/bar/ 4 -ancestor /foo/bar /foo:/:/bar/ 4 -ancestor /foo/bar /:/bar/:/fo 0 -ancestor /foo/bar /:/bar/ 0 -ancestor /foo/bar .:/foo/. 4 -ancestor /foo/bar .:/foo/.:.: 4 -ancestor /foo/bar /foo/./:.:/bar 4 -ancestor /foo/bar .:/bar -1 +ancestor /foo/bar /fo -1 +ancestor /foo/bar /foo:/bar 4 +ancestor /foo/bar /:/foo:/bar 4 +ancestor /foo/bar /foo:/:/bar 4 +ancestor /foo/bar /:/bar:/fo 0 +ancestor /foo/bar /:/bar 0 +ancestor /foo/bar /foo 4 +ancestor /foo/bar /foo:/bar 4 +ancestor /foo/bar /bar -1 test_expect_success 'strip_path_suffix' ' test c:/msysgit = $(test-path-utils strip_path_suffix \ diff --git a/t/t0063-string-list.sh b/t/t0063-string-list.sh index 41c8826..dbfc05e 100755 --- a/t/t0063-string-list.sh +++ b/t/t0063-string-list.sh @@ -17,14 +17,6 @@ test_split () { " } -test_longest_prefix () { - test "$(test-string-list longest_prefix "$1" "$2")" = "$3" -} - -test_no_longest_prefix () { - test_must_fail test-string-list longest_prefix "$1" "$2" -} - test_split "foo:bar:baz" ":" "-1" <<EOF 3 [0]: "foo" @@ -96,26 +88,4 @@ test_expect_success "test remove_duplicates" ' test a:b:c = "$(test-string-list remove_duplicates a:a:a:b:b:b:c:c:c)" ' -test_expect_success "test longest_prefix" ' - test_no_longest_prefix - '' && - test_no_longest_prefix - x && - test_longest_prefix "" x "" && - test_longest_prefix x x x && - test_longest_prefix "" foo "" && - test_longest_prefix : foo "" && - test_longest_prefix f foo f && - test_longest_prefix foo foobar foo && - test_longest_prefix foo foo foo && - test_no_longest_prefix bar foo && - test_no_longest_prefix bar:bar foo && - test_no_longest_prefix foobar foo && - test_longest_prefix foo:bar foo foo && - test_longest_prefix foo:bar bar bar && - test_longest_prefix foo::bar foo foo && - test_longest_prefix foo:foobar foo foo && - test_longest_prefix foobar:foo foo foo && - test_longest_prefix foo: bar "" && - test_longest_prefix :foo bar "" -' - test_done diff --git a/test-path-utils.c b/test-path-utils.c index 3bc20e9..0092cbf 100644 --- a/test-path-utils.c +++ b/test-path-utils.c @@ -1,4 +1,32 @@ #include "cache.h" +#include "string-list.h" + +/* + * A "string_list_each_func_t" function that normalizes an entry from + * GIT_CEILING_DIRECTORIES. If the path is unusable for some reason, + * die with an explanation. + */ +static int normalize_ceiling_entry(struct string_list_item *item, void *unused) +{ + const char *ceil = item->string; + int len = strlen(ceil); + char buf[PATH_MAX+1]; + + if (len == 0) + die("Empty path is not supported"); + if (len > PATH_MAX) + die("Path \"%s\" is too long", ceil); + if (!is_absolute_path(ceil)) + die("Path \"%s\" is not absolute", ceil); + if (normalize_path_copy(buf, ceil) < 0) + die("Path \"%s\" could not be normalized", ceil); + len = strlen(buf); + if (len > 1 && buf[len-1] == '/') + die("Normalized path \"%s\" ended with slash", buf); + free(item->string); + item->string = xstrdup(buf); + return 1; +} int main(int argc, char **argv) { @@ -30,7 +58,28 @@ int main(int argc, char **argv) } if (argc == 4 && !strcmp(argv[1], "longest_ancestor_length")) { - int len = longest_ancestor_length(argv[2], argv[3]); + int len; + struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; + char *path = xstrdup(argv[2]); + + /* + * We have to normalize the arguments because under + * Windows, bash mangles arguments that look like + * absolute POSIX paths or colon-separate lists of + * absolute POSIX paths into DOS paths (e.g., + * "/foo:/foo/bar" might be converted to + * "D:\Src\msysgit\foo;D:\Src\msysgit\foo\bar"), + * whereas longest_ancestor_length() requires paths + * that use forward slashes. + */ + if (normalize_path_copy(path, path)) + die("Path \"%s\" could not be normalized", argv[2]); + string_list_split(&ceiling_dirs, argv[3], PATH_SEP, -1); + filter_string_list(&ceiling_dirs, 0, + normalize_ceiling_entry, NULL); + len = longest_ancestor_length(path, &ceiling_dirs); + string_list_clear(&ceiling_dirs, 0); + free(path); printf("%d\n", len); return 0; } diff --git a/test-string-list.c b/test-string-list.c index 4693295..00ce6c9 100644 --- a/test-string-list.c +++ b/test-string-list.c @@ -97,26 +97,6 @@ int main(int argc, char **argv) return 0; } - if (argc == 4 && !strcmp(argv[1], "longest_prefix")) { - /* arguments: <colon-separated-prefixes>|- <string> */ - struct string_list prefixes = STRING_LIST_INIT_DUP; - int retval; - const char *prefix_string = argv[2]; - const char *string = argv[3]; - const char *match; - - parse_string_list(&prefixes, prefix_string); - match = string_list_longest_prefix(&prefixes, string); - if (match) { - printf("%s\n", match); - retval = 0; - } - else - retval = 1; - string_list_clear(&prefixes, 0); - return retval; - } - fprintf(stderr, "%s: unknown function name: %s\n", argv[0], argv[1] ? argv[1] : "(there was none)"); return 1; |