| /* |
| * 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" |
| |
| 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; |
| /* Not common even though its parent is */ |
| unsigned exclude:1; |
| const char *dirname; |
| }; |
| |
| static struct common_dir common_list[] = { |
| { 0, 1, 0, "branches" }, |
| { 0, 1, 0, "hooks" }, |
| { 0, 1, 0, "info" }, |
| { 0, 0, 1, "info/sparse-checkout" }, |
| { 1, 1, 0, "logs" }, |
| { 1, 1, 1, "logs/HEAD" }, |
| { 0, 1, 1, "logs/refs/bisect" }, |
| { 0, 1, 0, "lost-found" }, |
| { 0, 1, 0, "objects" }, |
| { 0, 1, 0, "refs" }, |
| { 0, 1, 1, "refs/bisect" }, |
| { 0, 1, 0, "remotes" }, |
| { 0, 1, 0, "worktrees" }, |
| { 0, 1, 0, "rr-cache" }, |
| { 0, 1, 0, "svn" }, |
| { 0, 0, 0, "config" }, |
| { 1, 0, 0, "gc.pid" }, |
| { 0, 0, 0, "packed-refs" }, |
| { 0, 0, 0, "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 *data, 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. Call fn |
| * with the unmatched portion of the key and the found value, and |
| * return its return value. If there is no such prefix, return -1. |
| * |
| * The key is partially normalized: consecutive slashes are skipped. |
| * |
| * For example, consider the trie containing only [refs, |
| * refs/worktree] (both with values). |
| * |
| * | key | unmatched | val from node | return value | |
| * |-----------------|------------|---------------|--------------| |
| * | a | not called | n/a | -1 | |
| * | refs | \0 | refs | as per fn | |
| * | refs/ | / | refs | as per fn | |
| * | refs/w | /w | refs | as per fn | |
| * | refs/worktree | \0 | refs/worktree | as per fn | |
| * | refs/worktree/ | / | refs/worktree | as per fn | |
| * | refs/worktree/a | /a | refs/worktree | 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 */ |
| return fn(key, root->value, baton); |
| |
| /* 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->dirname; p++) |
| add_to_trie(&common_trie, p->dirname, 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) |
| return 0; |
| |
| if (dir->is_dir && (unmatched[0] == 0 || unmatched[0] == '/')) |
| return !dir->exclude; |
| |
| if (!dir->is_dir && unmatched[0] == 0) |
| return !dir->exclude; |
| |
| 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; |
| init_common_trie(); |
| if (trie_find(&common_trie, base, check_common, NULL) > 0) |
| replace_dir(buf, git_dir_len, common_dir); |
| } |
| |
| 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->dirname; p++) { |
| const char *path = p->dirname; |
| 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->objectdir); |
| 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, real_path($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("."); |
| check_repository_format(); |
| 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. |
| * |
| * 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 |
| * 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; |
| } |
| } |
| } |
| |
| /* |
| * 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] < 0) { |
| /* |
| * 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; |
| } |
| |
| 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") |