diff options
Diffstat (limited to 'path.c')
| -rw-r--r-- | path.c | 903 |
1 files changed, 777 insertions, 126 deletions
@@ -1,24 +1,31 @@ /* - * 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" +#include "dir.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/"; -static char *get_pathname(void) +static struct strbuf *get_pathname(void) { - static char pathname_array[4][PATH_MAX]; + static struct strbuf pathname_array[4] = { + STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT + }; static int index; - return pathname_array[3 & ++index]; + struct strbuf *sb = &pathname_array[3 & ++index]; + strbuf_reset(sb); + return sb; } static char *cleanup_path(char *path) @@ -32,70 +39,238 @@ static char *cleanup_path(char *path) return path; } -char *mkpath(const char *fmt, ...) +static void strbuf_cleanup_path(struct strbuf *sb) +{ + char *path = cleanup_path(sb->buf); + if (path > sb->buf) + strbuf_remove(sb, 0, path - sb->buf); +} + +char *mksnpath(char *buf, size_t n, const char *fmt, ...) { va_list args; unsigned len; - char *pathname = get_pathname(); va_start(args, fmt); - len = vsnprintf(pathname, PATH_MAX, fmt, args); + len = vsnprintf(buf, n, fmt, args); va_end(args); - if (len >= PATH_MAX) - return bad_path; - return cleanup_path(pathname); + if (len >= n) { + strlcpy(buf, bad_path, n); + return buf; + } + return cleanup_path(buf); +} + +static int dir_prefix(const char *buf, const char *dir) +{ + int len = strlen(dir); + return !strncmp(buf, dir, len) && + (is_dir_sep(buf[len]) || buf[len] == '\0'); +} + +/* $buf =~ m|$dir/+$file| but without regex */ +static int is_dir_file(const char *buf, const char *dir, const char *file) +{ + int len = strlen(dir); + if (strncmp(buf, dir, len) || !is_dir_sep(buf[len])) + return 0; + while (is_dir_sep(buf[len])) + len++; + return !strcmp(buf + len, file); +} + +static void replace_dir(struct strbuf *buf, int len, const char *newdir) +{ + int newlen = strlen(newdir); + int need_sep = (buf->buf[len] && !is_dir_sep(buf->buf[len])) && + !is_dir_sep(newdir[newlen - 1]); + if (need_sep) + len--; /* keep one char, to be replaced with '/' */ + strbuf_splice(buf, 0, len, newdir, newlen); + if (need_sep) + buf->buf[newlen] = '/'; +} + +static const char *common_list[] = { + "/branches", "/hooks", "/info", "!/logs", "/lost-found", + "/objects", "/refs", "/remotes", "/worktrees", "/rr-cache", "/svn", + "config", "!gc.pid", "packed-refs", "shallow", + NULL +}; + +static void update_common_dir(struct strbuf *buf, int git_dir_len) +{ + char *base = buf->buf + git_dir_len; + const char **p; + + if (is_dir_file(base, "logs", "HEAD") || + is_dir_file(base, "info", "sparse-checkout")) + return; /* keep this in $GIT_DIR */ + for (p = common_list; *p; p++) { + const char *path = *p; + int is_dir = 0; + if (*path == '!') + path++; + if (*path == '/') { + path++; + is_dir = 1; + } + if (is_dir && dir_prefix(base, path)) { + replace_dir(buf, git_dir_len, get_git_common_dir()); + return; + } + if (!is_dir && !strcmp(base, path)) { + replace_dir(buf, git_dir_len, get_git_common_dir()); + return; + } + } +} + +void report_linked_checkout_garbage(void) +{ + struct strbuf sb = STRBUF_INIT; + const char **p; + int len; + + if (!git_common_dir_env) + return; + strbuf_addf(&sb, "%s/", get_git_dir()); + len = sb.len; + for (p = common_list; *p; p++) { + const char *path = *p; + if (*path == '!') + continue; + strbuf_setlen(&sb, len); + strbuf_addstr(&sb, path); + if (file_exists(sb.buf)) + report_garbage("unused in linked checkout", sb.buf); + } + strbuf_release(&sb); +} + +static void adjust_git_path(struct strbuf *buf, int git_dir_len) +{ + const char *base = buf->buf + git_dir_len; + if (git_graft_env && is_dir_file(base, "info", "grafts")) + strbuf_splice(buf, 0, buf->len, + get_graft_file(), strlen(get_graft_file())); + else if (git_index_env && !strcmp(base, "index")) + strbuf_splice(buf, 0, buf->len, + get_index_file(), strlen(get_index_file())); + else if (git_db_env && dir_prefix(base, "objects")) + replace_dir(buf, git_dir_len + 7, get_object_directory()); + else if (git_common_dir_env) + update_common_dir(buf, git_dir_len); +} + +static void do_git_path(struct strbuf *buf, const char *fmt, va_list args) +{ + int gitdir_len; + strbuf_addstr(buf, get_git_dir()); + if (buf->len && !is_dir_sep(buf->buf[buf->len - 1])) + strbuf_addch(buf, '/'); + gitdir_len = buf->len; + strbuf_vaddf(buf, fmt, args); + adjust_git_path(buf, gitdir_len); + strbuf_cleanup_path(buf); } -char *git_path(const char *fmt, ...) +void strbuf_git_path(struct strbuf *sb, const char *fmt, ...) { - const char *git_dir = get_git_dir(); - char *pathname = get_pathname(); va_list args; - unsigned len; + va_start(args, fmt); + do_git_path(sb, fmt, args); + va_end(args); +} - len = strlen(git_dir); - if (len > PATH_MAX-100) - return bad_path; - memcpy(pathname, git_dir, len); - if (len && git_dir[len-1] != '/') - pathname[len++] = '/'; +const char *git_path(const char *fmt, ...) +{ + struct strbuf *pathname = get_pathname(); + va_list args; va_start(args, fmt); - len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); + do_git_path(pathname, fmt, args); va_end(args); - if (len >= PATH_MAX) - return bad_path; - return cleanup_path(pathname); + return pathname->buf; } +char *git_pathdup(const char *fmt, ...) +{ + struct strbuf path = STRBUF_INIT; + va_list args; + va_start(args, fmt); + do_git_path(&path, fmt, args); + va_end(args); + return strbuf_detach(&path, NULL); +} -/* git_mkstemp() - create tmp file honoring TMPDIR variable */ -int git_mkstemp(char *path, size_t len, const char *template) +char *mkpathdup(const char *fmt, ...) { - char *env, *pch = path; + struct strbuf sb = STRBUF_INIT; + va_list args; + va_start(args, fmt); + strbuf_vaddf(&sb, fmt, args); + va_end(args); + strbuf_cleanup_path(&sb); + return strbuf_detach(&sb, NULL); +} - if ((env = getenv("TMPDIR")) == NULL) { - strcpy(pch, "/tmp/"); - len -= 5; - pch += 5; - } else { - size_t n = snprintf(pch, len, "%s/", env); +const char *mkpath(const char *fmt, ...) +{ + va_list args; + struct strbuf *pathname = get_pathname(); + va_start(args, fmt); + strbuf_vaddf(pathname, fmt, args); + va_end(args); + return cleanup_path(pathname->buf); +} - len -= n; - pch += n; +static void do_submodule_path(struct strbuf *buf, const char *path, + const char *fmt, va_list args) +{ + const char *git_dir; + + strbuf_addstr(buf, path); + if (buf->len && buf->buf[buf->len - 1] != '/') + strbuf_addch(buf, '/'); + strbuf_addstr(buf, ".git"); + + git_dir = read_gitfile(buf->buf); + if (git_dir) { + strbuf_reset(buf); + strbuf_addstr(buf, git_dir); } + strbuf_addch(buf, '/'); - strlcpy(pch, template, len); + strbuf_vaddf(buf, fmt, args); + strbuf_cleanup_path(buf); +} - return mkstemp(path); +char *git_pathdup_submodule(const char *path, const char *fmt, ...) +{ + va_list args; + struct strbuf buf = STRBUF_INIT; + va_start(args, fmt); + do_submodule_path(&buf, path, fmt, args); + va_end(args); + return strbuf_detach(&buf, NULL); } +void strbuf_git_path_submodule(struct strbuf *buf, const char *path, + const char *fmt, ...) +{ + va_list args; + va_start(args, fmt); + do_submodule_path(buf, path, fmt, args); + va_end(args); +} int validate_headref(const char *path) { struct stat st; char *buf, buffer[256]; unsigned char sha1[20]; - int len, fd; + int fd; + ssize_t len; if (lstat(path, &st) < 0) return -1; @@ -140,43 +315,49 @@ int validate_headref(const char *path) return -1; } -static char *user_path(char *buf, char *path, int sz) +static struct passwd *getpw_str(const char *username, size_t len) { struct passwd *pw; - char *slash; - int len, baselen; + char *username_z = xmemdupz(username, len); + pw = getpwnam(username_z); + free(username_z); + return pw; +} - if (!path || path[0] != '~') - return NULL; - path++; - slash = strchr(path, '/'); - if (path[0] == '/' || !path[0]) { - pw = getpwuid(getuid()); - } - else { - if (slash) { - *slash = 0; - pw = getpwnam(path); - *slash = '/'; +/* + * Return a string with ~ and ~user expanded via getpw*. If buf != NULL, + * then it is a newly allocated string. Returns NULL on getpw failure or + * if path is NULL. + */ +char *expand_user_path(const char *path) +{ + struct strbuf user_path = STRBUF_INIT; + 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) { + const char *home = getenv("HOME"); + if (!home) + goto return_null; + strbuf_addstr(&user_path, home); + } else { + struct passwd *pw = getpw_str(username, username_len); + if (!pw) + goto return_null; + strbuf_addstr(&user_path, pw->pw_dir); } - else - pw = getpwnam(path); - } - if (!pw || !pw->pw_dir || sz <= strlen(pw->pw_dir)) - return NULL; - baselen = strlen(pw->pw_dir); - memcpy(buf, pw->pw_dir, baselen); - while ((1 < baselen) && (buf[baselen-1] == '/')) { - buf[baselen-1] = 0; - baselen--; + to_copy = first_slash; } - if (slash && slash[1]) { - len = strlen(slash); - if (sz <= baselen + len) - return NULL; - memcpy(buf + baselen, slash, len + 1); - } - return buf; + strbuf_addstr(&user_path, to_copy); + return strbuf_detach(&user_path, NULL); +return_null: + strbuf_release(&user_path); + return NULL; } /* @@ -189,21 +370,16 @@ static char *user_path(char *buf, char *path, int sz) * (3) "relative/path" to mean cwd relative directory; or * (4) "/absolute/path" to mean absolute directory. * - * Unless "strict" is given, we try access() for existence of "%s.git/.git", - * "%s/.git", "%s.git", "%s" in this order. The first one that exists is - * what we try. - * - * Second, we try chdir() to that. Upon failure, we return NULL. - * - * Then, we try if the current directory is a valid git repository. - * Upon failure, we return NULL. + * Unless "strict" is given, we check "%s/.git", "%s", "%s.git/.git", "%s.git" + * in this order. We select the first one that is a valid git repository, and + * chdir() to it. If none match, or we fail to chdir, we return NULL. * * If all goes well, we return the directory we used to chdir() (but * before ~user is expanded), avoiding getcwd() resolving symbolic * links. User relative paths are also returned as they are given, * except DWIM suffixing. */ -char *enter_repo(char *path, int strict) +const char *enter_repo(const char *path, int strict) { static char used_path[PATH_MAX]; static char validated_path[PATH_MAX]; @@ -213,37 +389,52 @@ char *enter_repo(char *path, int strict) if (!strict) { static const char *suffix[] = { - ".git/.git", "/.git", ".git", "", NULL, + "/.git", "", ".git/.git", ".git", NULL, }; + const char *gitfile; int len = strlen(path); int i; - while ((1 < len) && (path[len-1] == '/')) { - path[len-1] = 0; + while ((1 < len) && (path[len-1] == '/')) len--; - } + if (PATH_MAX <= len) return NULL; - if (path[0] == '~') { - if (!user_path(used_path, path, PATH_MAX)) + strncpy(used_path, path, len); used_path[len] = 0 ; + strcpy(validated_path, used_path); + + if (used_path[0] == '~') { + char *newpath = expand_user_path(used_path); + if (!newpath || (PATH_MAX - 10 < strlen(newpath))) { + free(newpath); return NULL; - strcpy(validated_path, path); - path = used_path; + } + /* + * Copy back into the static buffer. A pity + * since newpath was not bounded, but other + * branches of the if are limited by PATH_MAX + * anyway. + */ + strcpy(used_path, newpath); free(newpath); } else if (PATH_MAX - 10 < len) return NULL; - else { - path = strcpy(used_path, path); - strcpy(validated_path, path); - } - len = strlen(path); + len = strlen(used_path); for (i = 0; suffix[i]; i++) { - strcpy(path + len, suffix[i]); - if (!access(path, F_OK)) { + struct stat st; + strcpy(used_path + len, suffix[i]); + if (!stat(used_path, &st) && + (S_ISREG(st.st_mode) || + (S_ISDIR(st.st_mode) && is_git_directory(used_path)))) { strcat(validated_path, suffix[i]); break; } } - if (!suffix[i] || chdir(path)) + if (!suffix[i]) + return NULL; + gitfile = read_gitfile(used_path) ; + if (gitfile) + strcpy(used_path, gitfile); + if (chdir(used_path)) return NULL; path = validated_path; } @@ -252,7 +443,7 @@ char *enter_repo(char *path, int strict) if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 && validate_headref("HEAD") == 0) { - setenv(GIT_DIR_ENVIRONMENT, ".", 1); + set_git_dir("."); check_repository_format(); return path; } @@ -260,35 +451,495 @@ char *enter_repo(char *path, int strict) return NULL; } +static int calc_shared_perm(int mode) +{ + int tweak; + + if (shared_repository < 0) + tweak = -shared_repository; + else + tweak = shared_repository; + + if (!(mode & S_IWUSR)) + tweak &= ~0222; + if (mode & S_IXUSR) + /* Copy read bits to execute bits */ + tweak |= (tweak & 0444) >> 2; + if (shared_repository < 0) + mode = (mode & ~0777) | tweak; + else + mode |= tweak; + + return mode; +} + + int adjust_shared_perm(const char *path) { - struct stat st; - int mode; + int old_mode, new_mode; if (!shared_repository) return 0; - if (lstat(path, &st) < 0) + if (get_st_mode_bits(path, &old_mode) < 0) return -1; - mode = st.st_mode; - if (mode & S_IRUSR) - mode |= (shared_repository == PERM_GROUP - ? S_IRGRP - : (shared_repository == PERM_EVERYBODY - ? (S_IRGRP|S_IROTH) - : 0)); - if (mode & S_IWUSR) - mode |= S_IWGRP; + new_mode = calc_shared_perm(old_mode); + if (S_ISDIR(old_mode)) { + /* Copy read bits to execute bits */ + new_mode |= (new_mode & 0444) >> 2; + new_mode |= FORCE_DIR_SET_GID; + } - if (mode & S_IXUSR) - mode |= (shared_repository == PERM_GROUP - ? S_IXGRP - : (shared_repository == PERM_EVERYBODY - ? (S_IXGRP|S_IXOTH) - : 0)); - if (S_ISDIR(mode)) - mode |= S_ISGID; - if ((mode & st.st_mode) != mode && chmod(path, mode) < 0) + if (((old_mode ^ new_mode) & ~S_IFMT) && + chmod(path, (new_mode & ~S_IFMT)) < 0) return -2; return 0; } + +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 (!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(in[j])) + j++; + continue; + } else if (in[j] != prefix[i]) { + return in; + } + i++; + j++; + } + if ( + /* "/foo" is a prefix of "/foo" */ + in[j] && + /* "/foo" is not a prefix of "/foobar" */ + !is_dir_sep(prefix[i-1]) && !is_dir_sep(in[j]) + ) + return in; + while (is_dir_sep(in[j])) + j++; + if (!in[j]) + strcpy(buf, "."); + else + strcpy(buf, in + j); + return buf; +} + +/* + * It is okay if dst == src, but they should not overlap otherwise. + * + * Performs the following normalizations on src, storing the result in dst: + * - Ensures that components are separated by '/' (Windows only) + * - Squashes sequences of '/'. + * - Removes "." components. + * - Removes ".." components, and the components the precede them. + * Returns failure (non-zero) if a ".." component appears as first path + * component anytime during the normalization. Otherwise, returns success (0). + * + * 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_len(char *dst, const char *src, int *prefix_len) +{ + char *dst0; + + if (has_dos_drive_prefix(src)) { + *dst++ = *src++; + *dst++ = *src++; + } + dst0 = dst; + + if (is_dir_sep(*src)) { + *dst++ = '/'; + while (is_dir_sep(*src)) + src++; + } + + for (;;) { + char c = *src; + + /* + * A path component that begins with . could be + * special: + * (1) "." and ends -- ignore and terminate. + * (2) "./" -- ignore them, eat slash and continue. + * (3) ".." and ends -- strip one and terminate. + * (4) "../" -- strip one, eat slash and continue. + */ + if (c == '.') { + if (!src[1]) { + /* (1) */ + src++; + } else if (is_dir_sep(src[1])) { + /* (2) */ + src += 2; + while (is_dir_sep(*src)) + src++; + continue; + } else if (src[1] == '.') { + if (!src[2]) { + /* (3) */ + src += 2; + goto up_one; + } else if (is_dir_sep(src[2])) { + /* (4) */ + src += 3; + while (is_dir_sep(*src)) + src++; + goto up_one; + } + } + } + + /* copy up to the next '/', and eat all '/' */ + while ((c = *src++) != '\0' && !is_dir_sep(c)) + *dst++ = c; + if (is_dir_sep(c)) { + *dst++ = '/'; + while (is_dir_sep(c)) + c = *src++; + src--; + } else if (!c) + break; + continue; + + up_one: + /* + * dst0..dst is prefix portion, and dst[-1] is '/'; + * go up one level. + */ + dst--; /* go to trailing '/' */ + if (dst <= dst0) + return -1; + /* 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 + * prefixes = string_list containing normalized, absolute paths without + * trailing slashes (except for the root directory, which is denoted by "/"). + * + * 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 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. + */ +int longest_ancestor_length(const char *path, struct string_list *prefixes) +{ + int i, max_len = -1; + + if (!strcmp(path, "/")) + return -1; + + for (i = 0; i < prefixes->nr; i++) { + const char *ceil = prefixes->items[i].string; + int len = strlen(ceil); + + 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; +} + +/* strip arbitrary amount of directory separators at end of path */ +static inline int chomp_trailing_dir_sep(const char *path, int len) +{ + while (len && is_dir_sep(path[len - 1])) + len--; + return len; +} + +/* + * If path ends with suffix (complete path components), returns the + * part before suffix (sans trailing directory separators). + * Otherwise returns NULL. + */ +char *strip_path_suffix(const char *path, const char *suffix) +{ + int path_len = strlen(path), suffix_len = strlen(suffix); + + while (suffix_len) { + if (!path_len) + return NULL; + + if (is_dir_sep(path[path_len - 1])) { + if (!is_dir_sep(suffix[suffix_len - 1])) + return NULL; + path_len = chomp_trailing_dir_sep(path, path_len); + suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); + } + else if (path[--path_len] != suffix[--suffix_len]) + return NULL; + } + + if (path_len && !is_dir_sep(path[path_len - 1])) + return NULL; + return xstrndup(path, chomp_trailing_dir_sep(path, path_len)); +} + +int daemon_avoid_alias(const char *p) +{ + int sl, ndot; + + /* + * This resurrects the belts and suspenders paranoia check by HPA + * done in <435560F7.4080006@zytor.com> thread, now enter_repo() + * does not do getcwd() based path canonicalization. + * + * sl becomes true immediately after seeing '/' and continues to + * be true as long as dots continue after that without intervening + * non-dot character. + */ + if (!p || (*p != '/' && *p != '~')) + return -1; + sl = 1; ndot = 0; + p++; + + while (1) { + char ch = *p++; + if (sl) { + if (ch == '.') + ndot++; + else if (ch == '/') { + if (ndot < 3) + /* reject //, /./ and /../ */ + return -1; + ndot = 0; + } + else if (ch == 0) { + if (0 < ndot && ndot < 3) + /* reject /.$ and /..$ */ + return -1; + return 0; + } + else + sl = ndot = 0; + } + else if (ch == 0) + return 0; + else if (ch == '/') { + sl = 1; + ndot = 0; + } + } +} + +static int only_spaces_and_periods(const char *path, size_t len, size_t skip) +{ + if (len < skip) + return 0; + len -= skip; + path += skip; + while (len-- > 0) { + char c = *(path++); + if (c != ' ' && c != '.') + return 0; + } + return 1; +} + +int is_ntfs_dotgit(const char *name) +{ + int len; + + for (len = 0; ; len++) + if (!name[len] || name[len] == '\\' || is_dir_sep(name[len])) { + if (only_spaces_and_periods(name, len, 4) && + !strncasecmp(name, ".git", 4)) + return 1; + if (only_spaces_and_periods(name, len, 5) && + !strncasecmp(name, "git~1", 5)) + return 1; + if (name[len] != '\\') + return 0; + name += len + 1; + len = -1; + } +} + +char *xdg_config_home(const char *filename) +{ + const char *home, *config_home; + + assert(filename); + config_home = getenv("XDG_CONFIG_HOME"); + if (config_home && *config_home) + return mkpathdup("%s/git/%s", config_home, filename); + + home = getenv("HOME"); + if (home) + return mkpathdup("%s/.config/git/%s", home, filename); + return NULL; +} + +GIT_PATH_FUNC(git_path_cherry_pick_head, "CHERRY_PICK_HEAD") +GIT_PATH_FUNC(git_path_revert_head, "REVERT_HEAD") +GIT_PATH_FUNC(git_path_squash_msg, "SQUASH_MSG") +GIT_PATH_FUNC(git_path_merge_msg, "MERGE_MSG") +GIT_PATH_FUNC(git_path_merge_rr, "MERGE_RR") +GIT_PATH_FUNC(git_path_merge_mode, "MERGE_MODE") +GIT_PATH_FUNC(git_path_merge_head, "MERGE_HEAD") +GIT_PATH_FUNC(git_path_fetch_head, "FETCH_HEAD") +GIT_PATH_FUNC(git_path_shallow, "shallow") |