diff options
Diffstat (limited to 'third_party/git/path.c')
| -rw-r--r-- | third_party/git/path.c | 1538 |
1 files changed, 0 insertions, 1538 deletions
diff --git a/third_party/git/path.c b/third_party/git/path.c deleted file mode 100644 index 7b385e5eb282..000000000000 --- a/third_party/git/path.c +++ /dev/null @@ -1,1538 +0,0 @@ -/* - * Utilities for paths and pathnames - */ -#include "cache.h" -#include "repository.h" -#include "strbuf.h" -#include "string-list.h" -#include "dir.h" -#include "worktree.h" -#include "submodule-config.h" -#include "path.h" -#include "packfile.h" -#include "object-store.h" -#include "lockfile.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 struct strbuf *get_pathname(void) -{ - static struct strbuf pathname_array[4] = { - STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT - }; - static int index; - struct strbuf *sb = &pathname_array[index]; - index = (index + 1) % ARRAY_SIZE(pathname_array); - strbuf_reset(sb); - return sb; -} - -static const char *cleanup_path(const char *path) -{ - /* Clean it up */ - if (skip_prefix(path, "./", &path)) { - while (*path == '/') - path++; - } - return path; -} - -static void strbuf_cleanup_path(struct strbuf *sb) -{ - const 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; - - va_start(args, fmt); - len = vsnprintf(buf, n, fmt, args); - va_end(args); - if (len >= n) { - strlcpy(buf, bad_path, n); - return buf; - } - return (char *)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] = '/'; -} - -struct common_dir { - /* Not considered garbage for report_linked_checkout_garbage */ - unsigned ignore_garbage:1; - unsigned is_dir:1; - /* Belongs to the common dir, though it may contain paths that don't */ - unsigned is_common:1; - const char *path; -}; - -static struct common_dir common_list[] = { - { 0, 1, 1, "branches" }, - { 0, 1, 1, "common" }, - { 0, 1, 1, "hooks" }, - { 0, 1, 1, "info" }, - { 0, 0, 0, "info/sparse-checkout" }, - { 1, 1, 1, "logs" }, - { 1, 0, 0, "logs/HEAD" }, - { 0, 1, 0, "logs/refs/bisect" }, - { 0, 1, 0, "logs/refs/rewritten" }, - { 0, 1, 0, "logs/refs/worktree" }, - { 0, 1, 1, "lost-found" }, - { 0, 1, 1, "objects" }, - { 0, 1, 1, "refs" }, - { 0, 1, 0, "refs/bisect" }, - { 0, 1, 0, "refs/rewritten" }, - { 0, 1, 0, "refs/worktree" }, - { 0, 1, 1, "remotes" }, - { 0, 1, 1, "worktrees" }, - { 0, 1, 1, "rr-cache" }, - { 0, 1, 1, "svn" }, - { 0, 0, 1, "config" }, - { 1, 0, 1, "gc.pid" }, - { 0, 0, 1, "packed-refs" }, - { 0, 0, 1, "shallow" }, - { 0, 0, 0, NULL } -}; - -/* - * A compressed trie. A trie node consists of zero or more characters that - * are common to all elements with this prefix, optionally followed by some - * children. If value is not NULL, the trie node is a terminal node. - * - * For example, consider the following set of strings: - * abc - * def - * definite - * definition - * - * The trie would look like: - * root: len = 0, children a and d non-NULL, value = NULL. - * a: len = 2, contents = bc, value = (data for "abc") - * d: len = 2, contents = ef, children i non-NULL, value = (data for "def") - * i: len = 3, contents = nit, children e and i non-NULL, value = NULL - * e: len = 0, children all NULL, value = (data for "definite") - * i: len = 2, contents = on, children all NULL, - * value = (data for "definition") - */ -struct trie { - struct trie *children[256]; - int len; - char *contents; - void *value; -}; - -static struct trie *make_trie_node(const char *key, void *value) -{ - struct trie *new_node = xcalloc(1, sizeof(*new_node)); - new_node->len = strlen(key); - if (new_node->len) { - new_node->contents = xmalloc(new_node->len); - memcpy(new_node->contents, key, new_node->len); - } - new_node->value = value; - return new_node; -} - -/* - * Add a key/value pair to a trie. The key is assumed to be \0-terminated. - * If there was an existing value for this key, return it. - */ -static void *add_to_trie(struct trie *root, const char *key, void *value) -{ - struct trie *child; - void *old; - int i; - - if (!*key) { - /* we have reached the end of the key */ - old = root->value; - root->value = value; - return old; - } - - for (i = 0; i < root->len; i++) { - if (root->contents[i] == key[i]) - continue; - - /* - * Split this node: child will contain this node's - * existing children. - */ - child = xmalloc(sizeof(*child)); - memcpy(child->children, root->children, sizeof(root->children)); - - child->len = root->len - i - 1; - if (child->len) { - child->contents = xstrndup(root->contents + i + 1, - child->len); - } - child->value = root->value; - root->value = NULL; - root->len = i; - - memset(root->children, 0, sizeof(root->children)); - root->children[(unsigned char)root->contents[i]] = child; - - /* This is the newly-added child. */ - root->children[(unsigned char)key[i]] = - make_trie_node(key + i + 1, value); - return NULL; - } - - /* We have matched the entire compressed section */ - if (key[i]) { - child = root->children[(unsigned char)key[root->len]]; - if (child) { - return add_to_trie(child, key + root->len + 1, value); - } else { - child = make_trie_node(key + root->len + 1, value); - root->children[(unsigned char)key[root->len]] = child; - return NULL; - } - } - - old = root->value; - root->value = value; - return old; -} - -typedef int (*match_fn)(const char *unmatched, void *value, void *baton); - -/* - * Search a trie for some key. Find the longest /-or-\0-terminated - * prefix of the key for which the trie contains a value. If there is - * no such prefix, return -1. Otherwise call fn with the unmatched - * portion of the key and the found value. If fn returns 0 or - * positive, then return its return value. If fn returns negative, - * then call fn with the next-longest /-terminated prefix of the key - * (i.e. a parent directory) for which the trie contains a value, and - * handle its return value the same way. If there is no shorter - * /-terminated prefix with a value left, then return the negative - * return value of the most recent fn invocation. - * - * The key is partially normalized: consecutive slashes are skipped. - * - * For example, consider the trie containing only [logs, - * logs/refs/bisect], both with values, but not logs/refs. - * - * | key | unmatched | prefix to node | return value | - * |--------------------|----------------|------------------|--------------| - * | a | not called | n/a | -1 | - * | logstore | not called | n/a | -1 | - * | logs | \0 | logs | as per fn | - * | logs/ | / | logs | as per fn | - * | logs/refs | /refs | logs | as per fn | - * | logs/refs/ | /refs/ | logs | as per fn | - * | logs/refs/b | /refs/b | logs | as per fn | - * | logs/refs/bisected | /refs/bisected | logs | as per fn | - * | logs/refs/bisect | \0 | logs/refs/bisect | as per fn | - * | logs/refs/bisect/ | / | logs/refs/bisect | as per fn | - * | logs/refs/bisect/a | /a | logs/refs/bisect | as per fn | - * | (If fn in the previous line returns -1, then fn is called once more:) | - * | logs/refs/bisect/a | /refs/bisect/a | logs | as per fn | - * |--------------------|----------------|------------------|--------------| - */ -static int trie_find(struct trie *root, const char *key, match_fn fn, - void *baton) -{ - int i; - int result; - struct trie *child; - - if (!*key) { - /* we have reached the end of the key */ - if (root->value && !root->len) - return fn(key, root->value, baton); - else - return -1; - } - - for (i = 0; i < root->len; i++) { - /* Partial path normalization: skip consecutive slashes. */ - if (key[i] == '/' && key[i+1] == '/') { - key++; - continue; - } - if (root->contents[i] != key[i]) - return -1; - } - - /* Matched the entire compressed section */ - key += i; - if (!*key) { - /* End of key */ - if (root->value) - return fn(key, root->value, baton); - else - return -1; - } - - /* Partial path normalization: skip consecutive slashes */ - while (key[0] == '/' && key[1] == '/') - key++; - - child = root->children[(unsigned char)*key]; - if (child) - result = trie_find(child, key + 1, fn, baton); - else - result = -1; - - if (result >= 0 || (*key != '/' && *key != 0)) - return result; - if (root->value) - return fn(key, root->value, baton); - else - return -1; -} - -static struct trie common_trie; -static int common_trie_done_setup; - -static void init_common_trie(void) -{ - struct common_dir *p; - - if (common_trie_done_setup) - return; - - for (p = common_list; p->path; p++) - add_to_trie(&common_trie, p->path, p); - - common_trie_done_setup = 1; -} - -/* - * Helper function for update_common_dir: returns 1 if the dir - * prefix is common. - */ -static int check_common(const char *unmatched, void *value, void *baton) -{ - struct common_dir *dir = value; - - if (dir->is_dir && (unmatched[0] == 0 || unmatched[0] == '/')) - return dir->is_common; - - if (!dir->is_dir && unmatched[0] == 0) - return dir->is_common; - - return 0; -} - -static void update_common_dir(struct strbuf *buf, int git_dir_len, - const char *common_dir) -{ - char *base = buf->buf + git_dir_len; - int has_lock_suffix = strbuf_strip_suffix(buf, LOCK_SUFFIX); - - init_common_trie(); - if (trie_find(&common_trie, base, check_common, NULL) > 0) - replace_dir(buf, git_dir_len, common_dir); - - if (has_lock_suffix) - strbuf_addstr(buf, LOCK_SUFFIX); -} - -void report_linked_checkout_garbage(void) -{ - struct strbuf sb = STRBUF_INIT; - const struct common_dir *p; - int len; - - if (!the_repository->different_commondir) - return; - strbuf_addf(&sb, "%s/", get_git_dir()); - len = sb.len; - for (p = common_list; p->path; p++) { - const char *path = p->path; - if (p->ignore_garbage) - continue; - strbuf_setlen(&sb, len); - strbuf_addstr(&sb, path); - if (file_exists(sb.buf)) - report_garbage(PACKDIR_FILE_GARBAGE, sb.buf); - } - strbuf_release(&sb); -} - -static void adjust_git_path(const struct repository *repo, - struct strbuf *buf, int git_dir_len) -{ - const char *base = buf->buf + git_dir_len; - if (is_dir_file(base, "info", "grafts")) - strbuf_splice(buf, 0, buf->len, - repo->graft_file, strlen(repo->graft_file)); - else if (!strcmp(base, "index")) - strbuf_splice(buf, 0, buf->len, - repo->index_file, strlen(repo->index_file)); - else if (dir_prefix(base, "objects")) - replace_dir(buf, git_dir_len + 7, repo->objects->odb->path); - else if (git_hooks_path && dir_prefix(base, "hooks")) - replace_dir(buf, git_dir_len + 5, git_hooks_path); - else if (repo->different_commondir) - update_common_dir(buf, git_dir_len, repo->commondir); -} - -static void strbuf_worktree_gitdir(struct strbuf *buf, - const struct repository *repo, - const struct worktree *wt) -{ - if (!wt) - strbuf_addstr(buf, repo->gitdir); - else if (!wt->id) - strbuf_addstr(buf, repo->commondir); - else - strbuf_git_common_path(buf, repo, "worktrees/%s", wt->id); -} - -static void do_git_path(const struct repository *repo, - const struct worktree *wt, struct strbuf *buf, - const char *fmt, va_list args) -{ - int gitdir_len; - strbuf_worktree_gitdir(buf, repo, wt); - if (buf->len && !is_dir_sep(buf->buf[buf->len - 1])) - strbuf_addch(buf, '/'); - gitdir_len = buf->len; - strbuf_vaddf(buf, fmt, args); - if (!wt) - adjust_git_path(repo, buf, gitdir_len); - strbuf_cleanup_path(buf); -} - -char *repo_git_path(const struct repository *repo, - const char *fmt, ...) -{ - struct strbuf path = STRBUF_INIT; - va_list args; - va_start(args, fmt); - do_git_path(repo, NULL, &path, fmt, args); - va_end(args); - return strbuf_detach(&path, NULL); -} - -void strbuf_repo_git_path(struct strbuf *sb, - const struct repository *repo, - const char *fmt, ...) -{ - va_list args; - va_start(args, fmt); - do_git_path(repo, NULL, sb, fmt, args); - va_end(args); -} - -char *git_path_buf(struct strbuf *buf, const char *fmt, ...) -{ - va_list args; - strbuf_reset(buf); - va_start(args, fmt); - do_git_path(the_repository, NULL, buf, fmt, args); - va_end(args); - return buf->buf; -} - -void strbuf_git_path(struct strbuf *sb, const char *fmt, ...) -{ - va_list args; - va_start(args, fmt); - do_git_path(the_repository, NULL, sb, fmt, args); - va_end(args); -} - -const char *git_path(const char *fmt, ...) -{ - struct strbuf *pathname = get_pathname(); - va_list args; - va_start(args, fmt); - do_git_path(the_repository, NULL, pathname, fmt, args); - va_end(args); - return pathname->buf; -} - -char *git_pathdup(const char *fmt, ...) -{ - struct strbuf path = STRBUF_INIT; - va_list args; - va_start(args, fmt); - do_git_path(the_repository, NULL, &path, fmt, args); - va_end(args); - return strbuf_detach(&path, NULL); -} - -char *mkpathdup(const char *fmt, ...) -{ - 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); -} - -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); -} - -const char *worktree_git_path(const struct worktree *wt, const char *fmt, ...) -{ - struct strbuf *pathname = get_pathname(); - va_list args; - va_start(args, fmt); - do_git_path(the_repository, wt, pathname, fmt, args); - va_end(args); - return pathname->buf; -} - -static void do_worktree_path(const struct repository *repo, - struct strbuf *buf, - const char *fmt, va_list args) -{ - strbuf_addstr(buf, repo->worktree); - if(buf->len && !is_dir_sep(buf->buf[buf->len - 1])) - strbuf_addch(buf, '/'); - - strbuf_vaddf(buf, fmt, args); - strbuf_cleanup_path(buf); -} - -char *repo_worktree_path(const struct repository *repo, const char *fmt, ...) -{ - struct strbuf path = STRBUF_INIT; - va_list args; - - if (!repo->worktree) - return NULL; - - va_start(args, fmt); - do_worktree_path(repo, &path, fmt, args); - va_end(args); - - return strbuf_detach(&path, NULL); -} - -void strbuf_repo_worktree_path(struct strbuf *sb, - const struct repository *repo, - const char *fmt, ...) -{ - va_list args; - - if (!repo->worktree) - return; - - va_start(args, fmt); - do_worktree_path(repo, sb, fmt, args); - va_end(args); -} - -/* Returns 0 on success, negative on failure. */ -static int do_submodule_path(struct strbuf *buf, const char *path, - const char *fmt, va_list args) -{ - struct strbuf git_submodule_common_dir = STRBUF_INIT; - struct strbuf git_submodule_dir = STRBUF_INIT; - int ret; - - ret = submodule_to_gitdir(&git_submodule_dir, path); - if (ret) - goto cleanup; - - strbuf_complete(&git_submodule_dir, '/'); - strbuf_addbuf(buf, &git_submodule_dir); - strbuf_vaddf(buf, fmt, args); - - if (get_common_dir_noenv(&git_submodule_common_dir, git_submodule_dir.buf)) - update_common_dir(buf, git_submodule_dir.len, git_submodule_common_dir.buf); - - strbuf_cleanup_path(buf); - -cleanup: - strbuf_release(&git_submodule_dir); - strbuf_release(&git_submodule_common_dir); - return ret; -} - -char *git_pathdup_submodule(const char *path, const char *fmt, ...) -{ - int err; - va_list args; - struct strbuf buf = STRBUF_INIT; - va_start(args, fmt); - err = do_submodule_path(&buf, path, fmt, args); - va_end(args); - if (err) { - strbuf_release(&buf); - return NULL; - } - return strbuf_detach(&buf, NULL); -} - -int strbuf_git_path_submodule(struct strbuf *buf, const char *path, - const char *fmt, ...) -{ - int err; - va_list args; - va_start(args, fmt); - err = do_submodule_path(buf, path, fmt, args); - va_end(args); - - return err; -} - -static void do_git_common_path(const struct repository *repo, - struct strbuf *buf, - const char *fmt, - va_list args) -{ - strbuf_addstr(buf, repo->commondir); - if (buf->len && !is_dir_sep(buf->buf[buf->len - 1])) - strbuf_addch(buf, '/'); - strbuf_vaddf(buf, fmt, args); - strbuf_cleanup_path(buf); -} - -const char *git_common_path(const char *fmt, ...) -{ - struct strbuf *pathname = get_pathname(); - va_list args; - va_start(args, fmt); - do_git_common_path(the_repository, pathname, fmt, args); - va_end(args); - return pathname->buf; -} - -void strbuf_git_common_path(struct strbuf *sb, - const struct repository *repo, - const char *fmt, ...) -{ - va_list args; - va_start(args, fmt); - do_git_common_path(repo, sb, fmt, args); - va_end(args); -} - -int validate_headref(const char *path) -{ - struct stat st; - char buffer[256]; - const char *refname; - struct object_id oid; - int fd; - ssize_t len; - - if (lstat(path, &st) < 0) - return -1; - - /* Make sure it is a "refs/.." symlink */ - if (S_ISLNK(st.st_mode)) { - len = readlink(path, buffer, sizeof(buffer)-1); - if (len >= 5 && !memcmp("refs/", buffer, 5)) - return 0; - return -1; - } - - /* - * Anything else, just open it and try to see if it is a symbolic ref. - */ - fd = open(path, O_RDONLY); - if (fd < 0) - return -1; - len = read_in_full(fd, buffer, sizeof(buffer)-1); - close(fd); - - if (len < 0) - return -1; - buffer[len] = '\0'; - - /* - * Is it a symbolic ref? - */ - if (skip_prefix(buffer, "ref:", &refname)) { - while (isspace(*refname)) - refname++; - if (starts_with(refname, "refs/")) - return 0; - } - - /* - * Is this a detached HEAD? - */ - if (!get_oid_hex(buffer, &oid)) - return 0; - - return -1; -} - -static struct passwd *getpw_str(const char *username, size_t len) -{ - struct passwd *pw; - char *username_z = xmemdupz(username, len); - pw = getpwnam(username_z); - free(username_z); - return pw; -} - -/* - * 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. - * - * If real_home is true, strbuf_realpath($HOME) is used in the expansion. - */ -char *expand_user_path(const char *path, int real_home) -{ - 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; - if (real_home) - strbuf_add_real_path(&user_path, home); - else - strbuf_addstr(&user_path, home); -#ifdef GIT_WINDOWS_NATIVE - convert_slashes(user_path.buf); -#endif - } else { - struct passwd *pw = getpw_str(username, username_len); - if (!pw) - goto return_null; - strbuf_addstr(&user_path, pw->pw_dir); - } - to_copy = first_slash; - } - strbuf_addstr(&user_path, to_copy); - return strbuf_detach(&user_path, NULL); -return_null: - strbuf_release(&user_path); - return NULL; -} - -/* - * First, one directory to try is determined by the following algorithm. - * - * (0) If "strict" is given, the path is used as given and no DWIM is - * done. Otherwise: - * (1) "~/path" to mean path under the running user's home directory; - * (2) "~user/path" to mean path under named user's home directory; - * (3) "relative/path" to mean cwd relative directory; or - * (4) "/absolute/path" to mean absolute directory. - * - * 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. - */ -const char *enter_repo(const char *path, int strict) -{ - static struct strbuf validated_path = STRBUF_INIT; - static struct strbuf used_path = STRBUF_INIT; - - if (!path) - return NULL; - - if (!strict) { - static const char *suffix[] = { - "/.git", "", ".git/.git", ".git", NULL, - }; - const char *gitfile; - int len = strlen(path); - int i; - while ((1 < len) && (path[len-1] == '/')) - len--; - - /* - * We can handle arbitrary-sized buffers, but this remains as a - * sanity check on untrusted input. - */ - if (PATH_MAX <= len) - return NULL; - - strbuf_reset(&used_path); - strbuf_reset(&validated_path); - strbuf_add(&used_path, path, len); - strbuf_add(&validated_path, path, len); - - if (used_path.buf[0] == '~') { - char *newpath = expand_user_path(used_path.buf, 0); - if (!newpath) - return NULL; - strbuf_attach(&used_path, newpath, strlen(newpath), - strlen(newpath)); - } - for (i = 0; suffix[i]; i++) { - struct stat st; - size_t baselen = used_path.len; - strbuf_addstr(&used_path, suffix[i]); - if (!stat(used_path.buf, &st) && - (S_ISREG(st.st_mode) || - (S_ISDIR(st.st_mode) && is_git_directory(used_path.buf)))) { - strbuf_addstr(&validated_path, suffix[i]); - break; - } - strbuf_setlen(&used_path, baselen); - } - if (!suffix[i]) - return NULL; - gitfile = read_gitfile(used_path.buf); - if (gitfile) { - strbuf_reset(&used_path); - strbuf_addstr(&used_path, gitfile); - } - if (chdir(used_path.buf)) - return NULL; - path = validated_path.buf; - } - else { - const char *gitfile = read_gitfile(path); - if (gitfile) - path = gitfile; - if (chdir(path)) - return NULL; - } - - if (is_git_directory(".")) { - set_git_dir(".", 0); - check_repository_format(NULL); - return path; - } - - return NULL; -} - -static int calc_shared_perm(int mode) -{ - int tweak; - - if (get_shared_repository() < 0) - tweak = -get_shared_repository(); - else - tweak = get_shared_repository(); - - if (!(mode & S_IWUSR)) - tweak &= ~0222; - if (mode & S_IXUSR) - /* Copy read bits to execute bits */ - tweak |= (tweak & 0444) >> 2; - if (get_shared_repository() < 0) - mode = (mode & ~0777) | tweak; - else - mode |= tweak; - - return mode; -} - - -int adjust_shared_perm(const char *path) -{ - int old_mode, new_mode; - - if (!get_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 */ - new_mode |= (new_mode & 0444) >> 2; - new_mode |= FORCE_DIR_SET_GID; - } - - if (((old_mode ^ new_mode) & ~S_IFMT) && - chmod(path, (new_mode & ~S_IFMT)) < 0) - return -2; - return 0; -} - -void safe_create_dir(const char *dir, int share) -{ - if (mkdir(dir, 0777) < 0) { - if (errno != EEXIST) { - perror(dir); - exit(1); - } - } - else if (share && adjust_shared_perm(dir)) - die(_("Could not make %s writable by group"), dir); -} - -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:" */ - i = j = has_dos_drive_prefix(in); - 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 struct strbuf buf = STRBUF_INIT; - 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++; - - strbuf_reset(&buf); - if (!in[j]) - strbuf_addstr(&buf, "."); - else - strbuf_addstr(&buf, in + j); - return buf.buf; -} - -/* - * It is okay if dst == src, but they should not overlap otherwise. - * The "dst" buffer must be at least as long as "src"; normalizing may shrink - * the size of the path, but will never grow it. - * - * Performs the following normalizations on src, storing the result in dst: - * - Ensures that components are separated by '/' (Windows only) - * - Squashes sequences of '/' except "//server/share" on Windows - * - 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. - * - * NEEDSWORK: This function doesn't perform normalization w.r.t. trailing '/'. - * For everything but the root folder itself, the normalized path should not - * end with a '/', then the callers need to be fixed up accordingly. - * - */ -int normalize_path_copy_len(char *dst, const char *src, int *prefix_len) -{ - char *dst0; - const char *end; - - /* - * Copy initial part of absolute path: "/", "C:/", "//server/share/". - */ - end = src + offset_1st_component(src); - while (src < end) { - char c = *src++; - if (is_dir_sep(c)) - c = '/'; - *dst++ = c; - } - dst0 = 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 offset of - * the last character in the path before the suffix (sans trailing directory - * separators), and -1 otherwise. - */ -static ssize_t stripped_path_suffix_offset(const char *path, const char *suffix) -{ - int path_len = strlen(path), suffix_len = strlen(suffix); - - while (suffix_len) { - if (!path_len) - return -1; - - if (is_dir_sep(path[path_len - 1])) { - if (!is_dir_sep(suffix[suffix_len - 1])) - return -1; - 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 -1; - } - - if (path_len && !is_dir_sep(path[path_len - 1])) - return -1; - return chomp_trailing_dir_sep(path, path_len); -} - -/* - * Returns true if the path ends with components, considering only complete path - * components, and false otherwise. - */ -int ends_with_path_components(const char *path, const char *components) -{ - return stripped_path_suffix_offset(path, components) != -1; -} - -/* - * 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) -{ - ssize_t offset = stripped_path_suffix_offset(path, suffix); - - return offset == -1 ? NULL : xstrndup(path, offset); -} - -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; - } - } -} - -/* - * On NTFS, we need to be careful to disallow certain synonyms of the `.git/` - * directory: - * - * - For historical reasons, file names that end in spaces or periods are - * automatically trimmed. Therefore, `.git . . ./` is a valid way to refer - * to `.git/`. - * - * - For other historical reasons, file names that do not conform to the 8.3 - * format (up to eight characters for the basename, three for the file - * extension, certain characters not allowed such as `+`, etc) are associated - * with a so-called "short name", at least on the `C:` drive by default. - * Which means that `git~1/` is a valid way to refer to `.git/`. - * - * Note: Technically, `.git/` could receive the short name `git~2` if the - * short name `git~1` were already used. In Git, however, we guarantee that - * `.git` is the first item in a directory, therefore it will be associated - * with the short name `git~1` (unless short names are disabled). - * - * - For yet other historical reasons, NTFS supports so-called "Alternate Data - * Streams", i.e. metadata associated with a given file, referred to via - * `<filename>:<stream-name>:<stream-type>`. There exists a default stream - * type for directories, allowing `.git/` to be accessed via - * `.git::$INDEX_ALLOCATION/`. - * - * When this function returns 1, it indicates that the specified file/directory - * name refers to a `.git` file or directory, or to any of these synonyms, and - * Git should therefore not track it. - * - * For performance reasons, _all_ Alternate Data Streams of `.git/` are - * forbidden, not just `::$INDEX_ALLOCATION`. - * - * This function is intended to be used by `git fsck` even on platforms where - * the backslash is a regular filename character, therefore it needs to handle - * backlash characters in the provided `name` specially: they are interpreted - * as directory separators. - */ -int is_ntfs_dotgit(const char *name) -{ - char c; - - /* - * Note that when we don't find `.git` or `git~1` we end up with `name` - * advanced partway through the string. That's okay, though, as we - * return immediately in those cases, without looking at `name` any - * further. - */ - c = *(name++); - if (c == '.') { - /* .git */ - if (((c = *(name++)) != 'g' && c != 'G') || - ((c = *(name++)) != 'i' && c != 'I') || - ((c = *(name++)) != 't' && c != 'T')) - return 0; - } else if (c == 'g' || c == 'G') { - /* git ~1 */ - if (((c = *(name++)) != 'i' && c != 'I') || - ((c = *(name++)) != 't' && c != 'T') || - *(name++) != '~' || - *(name++) != '1') - return 0; - } else - return 0; - - for (;;) { - c = *(name++); - if (!c || c == '\\' || c == '/' || c == ':') - return 1; - if (c != '.' && c != ' ') - return 0; - } -} - -static int is_ntfs_dot_generic(const char *name, - const char *dotgit_name, - size_t len, - const char *dotgit_ntfs_shortname_prefix) -{ - int saw_tilde; - size_t i; - - if ((name[0] == '.' && !strncasecmp(name + 1, dotgit_name, len))) { - i = len + 1; -only_spaces_and_periods: - for (;;) { - char c = name[i++]; - if (!c || c == ':') - return 1; - if (c != ' ' && c != '.') - return 0; - } - } - - /* - * Is it a regular NTFS short name, i.e. shortened to 6 characters, - * followed by ~1, ... ~4? - */ - if (!strncasecmp(name, dotgit_name, 6) && name[6] == '~' && - name[7] >= '1' && name[7] <= '4') { - i = 8; - goto only_spaces_and_periods; - } - - /* - * Is it a fall-back NTFS short name (for details, see - * https://en.wikipedia.org/wiki/8.3_filename? - */ - for (i = 0, saw_tilde = 0; i < 8; i++) - if (name[i] == '\0') - return 0; - else if (saw_tilde) { - if (name[i] < '0' || name[i] > '9') - return 0; - } else if (name[i] == '~') { - if (name[++i] < '1' || name[i] > '9') - return 0; - saw_tilde = 1; - } else if (i >= 6) - return 0; - else if (name[i] & 0x80) { - /* - * We know our needles contain only ASCII, so we clamp - * here to make the results of tolower() sane. - */ - return 0; - } else if (tolower(name[i]) != dotgit_ntfs_shortname_prefix[i]) - return 0; - - goto only_spaces_and_periods; -} - -/* - * Inline helper to make sure compiler resolves strlen() on literals at - * compile time. - */ -static inline int is_ntfs_dot_str(const char *name, const char *dotgit_name, - const char *dotgit_ntfs_shortname_prefix) -{ - return is_ntfs_dot_generic(name, dotgit_name, strlen(dotgit_name), - dotgit_ntfs_shortname_prefix); -} - -int is_ntfs_dotgitmodules(const char *name) -{ - return is_ntfs_dot_str(name, "gitmodules", "gi7eba"); -} - -int is_ntfs_dotgitignore(const char *name) -{ - return is_ntfs_dot_str(name, "gitignore", "gi250a"); -} - -int is_ntfs_dotgitattributes(const char *name) -{ - return is_ntfs_dot_str(name, "gitattributes", "gi7d29"); -} - -int looks_like_command_line_option(const char *str) -{ - return str && str[0] == '-'; -} - -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; -} - -char *xdg_cache_home(const char *filename) -{ - const char *home, *cache_home; - - assert(filename); - cache_home = getenv("XDG_CACHE_HOME"); - if (cache_home && *cache_home) - return mkpathdup("%s/git/%s", cache_home, filename); - - home = getenv("HOME"); - if (home) - return mkpathdup("%s/.cache/git/%s", home, filename); - return NULL; -} - -REPO_GIT_PATH_FUNC(squash_msg, "SQUASH_MSG") -REPO_GIT_PATH_FUNC(merge_msg, "MERGE_MSG") -REPO_GIT_PATH_FUNC(merge_rr, "MERGE_RR") -REPO_GIT_PATH_FUNC(merge_mode, "MERGE_MODE") -REPO_GIT_PATH_FUNC(merge_head, "MERGE_HEAD") -REPO_GIT_PATH_FUNC(merge_autostash, "MERGE_AUTOSTASH") -REPO_GIT_PATH_FUNC(fetch_head, "FETCH_HEAD") -REPO_GIT_PATH_FUNC(shallow, "shallow") |