diff options
Diffstat (limited to 'path.c')
| -rw-r--r-- | path.c | 288 |
1 files changed, 209 insertions, 79 deletions
@@ -1,17 +1,18 @@ /* - * I'm tired of doing "vsnprintf()" etc just to open a - * file, so here's a "return static buffer with printf" - * interface for paths. - * - * It's obviously not thread-safe. Sue me. But it's quite - * useful for doing things like - * - * f = open(mkpath("%s/%s.git", base, name), O_RDONLY); - * - * which is what it's designed for. + * Utilities for paths and pathnames */ #include "cache.h" #include "strbuf.h" +#include "string-list.h" + +static int get_st_mode_bits(const char *path, int *mode) +{ + struct stat st; + if (lstat(path, &st) < 0) + return -1; + *mode = st.st_mode; + return 0; +} static char bad_path[] = "/bad-path/"; @@ -264,12 +265,12 @@ static struct passwd *getpw_str(const char *username, size_t len) char *expand_user_path(const char *path) { struct strbuf user_path = STRBUF_INIT; - const char *first_slash = strchrnul(path, '/'); const char *to_copy = path; if (path == NULL) goto return_null; if (path[0] == '~') { + const char *first_slash = strchrnul(path, '/'); const char *username = path + 1; size_t username_len = first_slash - username; if (username_len == 0) { @@ -388,28 +389,14 @@ const char *enter_repo(const char *path, int strict) return NULL; } -int set_shared_perm(const char *path, int mode) +static int calc_shared_perm(int mode) { - struct stat st; - int tweak, shared, orig_mode; + int tweak; - if (!shared_repository) { - if (mode) - return chmod(path, mode & ~S_IFMT); - return 0; - } - if (!mode) { - if (lstat(path, &st) < 0) - return -1; - mode = st.st_mode; - orig_mode = mode; - } else - orig_mode = 0; if (shared_repository < 0) - shared = -shared_repository; + tweak = -shared_repository; else - shared = shared_repository; - tweak = shared; + tweak = shared_repository; if (!(mode & S_IWUSR)) tweak &= ~0222; @@ -421,55 +408,190 @@ int set_shared_perm(const char *path, int mode) else mode |= tweak; - if (S_ISDIR(mode)) { + return mode; +} + + +int adjust_shared_perm(const char *path) +{ + int old_mode, new_mode; + + if (!shared_repository) + return 0; + if (get_st_mode_bits(path, &old_mode) < 0) + return -1; + + new_mode = calc_shared_perm(old_mode); + if (S_ISDIR(old_mode)) { /* Copy read bits to execute bits */ - mode |= (shared & 0444) >> 2; - mode |= FORCE_DIR_SET_GID; + new_mode |= (new_mode & 0444) >> 2; + new_mode |= FORCE_DIR_SET_GID; } - if (((shared_repository < 0 - ? (orig_mode & (FORCE_DIR_SET_GID | 0777)) - : (orig_mode & mode)) != mode) && - chmod(path, (mode & ~S_IFMT)) < 0) + if (((old_mode ^ new_mode) & ~S_IFMT) && + chmod(path, (new_mode & ~S_IFMT)) < 0) return -2; return 0; } -const char *relative_path(const char *abs, const char *base) +static int have_same_root(const char *path1, const char *path2) +{ + int is_abs1, is_abs2; + + is_abs1 = is_absolute_path(path1); + is_abs2 = is_absolute_path(path2); + return (is_abs1 && is_abs2 && tolower(path1[0]) == tolower(path2[0])) || + (!is_abs1 && !is_abs2); +} + +/* + * Give path as relative to prefix. + * + * The strbuf may or may not be used, so do not assume it contains the + * returned path. + */ +const char *relative_path(const char *in, const char *prefix, + struct strbuf *sb) +{ + int in_len = in ? strlen(in) : 0; + int prefix_len = prefix ? strlen(prefix) : 0; + int in_off = 0; + int prefix_off = 0; + int i = 0, j = 0; + + if (!in_len) + return "./"; + else if (!prefix_len) + return in; + + if (have_same_root(in, prefix)) { + /* bypass dos_drive, for "c:" is identical to "C:" */ + if (has_dos_drive_prefix(in)) { + i = 2; + j = 2; + } + } else { + return in; + } + + while (i < prefix_len && j < in_len && prefix[i] == in[j]) { + if (is_dir_sep(prefix[i])) { + while (is_dir_sep(prefix[i])) + i++; + while (is_dir_sep(in[j])) + j++; + prefix_off = i; + in_off = j; + } else { + i++; + j++; + } + } + + if ( + /* "prefix" seems like prefix of "in" */ + i >= prefix_len && + /* + * but "/foo" is not a prefix of "/foobar" + * (i.e. prefix not end with '/') + */ + prefix_off < prefix_len) { + if (j >= in_len) { + /* in="/a/b", prefix="/a/b" */ + in_off = in_len; + } else if (is_dir_sep(in[j])) { + /* in="/a/b/c", prefix="/a/b" */ + while (is_dir_sep(in[j])) + j++; + in_off = j; + } else { + /* in="/a/bbb/c", prefix="/a/b" */ + i = prefix_off; + } + } else if ( + /* "in" is short than "prefix" */ + j >= in_len && + /* "in" not end with '/' */ + in_off < in_len) { + if (is_dir_sep(prefix[i])) { + /* in="/a/b", prefix="/a/b/c/" */ + while (is_dir_sep(prefix[i])) + i++; + in_off = in_len; + } + } + in += in_off; + in_len -= in_off; + + if (i >= prefix_len) { + if (!in_len) + return "./"; + else + return in; + } + + strbuf_reset(sb); + strbuf_grow(sb, in_len); + + while (i < prefix_len) { + if (is_dir_sep(prefix[i])) { + strbuf_addstr(sb, "../"); + while (is_dir_sep(prefix[i])) + i++; + continue; + } + i++; + } + if (!is_dir_sep(prefix[prefix_len - 1])) + strbuf_addstr(sb, "../"); + + strbuf_addstr(sb, in); + + return sb->buf; +} + +/* + * A simpler implementation of relative_path + * + * Get relative path by removing "prefix" from "in". This function + * first appears in v1.5.6-1-g044bbbc, and makes git_dir shorter + * to increase performance when traversing the path to work_tree. + */ +const char *remove_leading_path(const char *in, const char *prefix) { static char buf[PATH_MAX + 1]; int i = 0, j = 0; - if (!base || !base[0]) - return abs; - while (base[i]) { - if (is_dir_sep(base[i])) { - if (!is_dir_sep(abs[j])) - return abs; - while (is_dir_sep(base[i])) + if (!prefix || !prefix[0]) + return in; + while (prefix[i]) { + if (is_dir_sep(prefix[i])) { + if (!is_dir_sep(in[j])) + return in; + while (is_dir_sep(prefix[i])) i++; - while (is_dir_sep(abs[j])) + while (is_dir_sep(in[j])) j++; continue; - } else if (abs[j] != base[i]) { - return abs; + } else if (in[j] != prefix[i]) { + return in; } i++; j++; } if ( /* "/foo" is a prefix of "/foo" */ - abs[j] && + in[j] && /* "/foo" is not a prefix of "/foobar" */ - !is_dir_sep(base[i-1]) && !is_dir_sep(abs[j]) + !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j]) ) - return abs; - while (is_dir_sep(abs[j])) + return in; + while (is_dir_sep(in[j])) j++; - if (!abs[j]) + if (!in[j]) strcpy(buf, "."); else - strcpy(buf, abs + j); + strcpy(buf, in + j); return buf; } @@ -486,8 +608,14 @@ const char *relative_path(const char *abs, const char *base) * * Note that this function is purely textual. It does not follow symlinks, * verify the existence of the path, or make any system calls. + * + * prefix_len != NULL is for a specific case of prefix_pathspec(): + * assume that src == dst and src[0..prefix_len-1] is already + * normalized, any time "../" eats up to the prefix_len part, + * prefix_len is reduced. In the end prefix_len is the remaining + * prefix that has not been overridden by user pathspec. */ -int normalize_path_copy(char *dst, const char *src) +int normalize_path_copy_len(char *dst, const char *src, int *prefix_len) { char *dst0; @@ -562,50 +690,52 @@ int normalize_path_copy(char *dst, const char *src) /* Windows: dst[-1] cannot be backslash anymore */ while (dst0 < dst && dst[-1] != '/') dst--; + if (prefix_len && *prefix_len > dst - dst0) + *prefix_len = dst - dst0; } *dst = '\0'; return 0; } +int normalize_path_copy(char *dst, const char *src) +{ + return normalize_path_copy_len(dst, src, NULL); +} + /* * 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; |