diff options
Diffstat (limited to 'third_party/git/setup.c')
| -rw-r--r-- | third_party/git/setup.c | 1291 |
1 files changed, 0 insertions, 1291 deletions
diff --git a/third_party/git/setup.c b/third_party/git/setup.c deleted file mode 100644 index 8dcb4631f7..0000000000 --- a/third_party/git/setup.c +++ /dev/null @@ -1,1291 +0,0 @@ -#include "cache.h" -#include "repository.h" -#include "config.h" -#include "dir.h" -#include "string-list.h" -#include "chdir-notify.h" - -static int inside_git_dir = -1; -static int inside_work_tree = -1; -static int work_tree_config_is_bogus; - -static struct startup_info the_startup_info; -struct startup_info *startup_info = &the_startup_info; - -/* - * The input parameter must contain an absolute path, and it must already be - * normalized. - * - * Find the part of an absolute path that lies inside the work tree by - * dereferencing symlinks outside the work tree, for example: - * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file - * /dir/file (work tree is /) -> dir/file - * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2 - * /dir/repolink/file (repolink points to /dir/repo) -> file - * /dir/repo (exactly equal to work tree) -> (empty string) - */ -static int abspath_part_inside_repo(char *path) -{ - size_t len; - size_t wtlen; - char *path0; - int off; - const char *work_tree = get_git_work_tree(); - - if (!work_tree) - return -1; - wtlen = strlen(work_tree); - len = strlen(path); - off = offset_1st_component(path); - - /* check if work tree is already the prefix */ - if (wtlen <= len && !fspathncmp(path, work_tree, wtlen)) { - if (path[wtlen] == '/') { - memmove(path, path + wtlen + 1, len - wtlen); - return 0; - } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') { - /* work tree is the root, or the whole path */ - memmove(path, path + wtlen, len - wtlen + 1); - return 0; - } - /* work tree might match beginning of a symlink to work tree */ - off = wtlen; - } - path0 = path; - path += off; - - /* check each '/'-terminated level */ - while (*path) { - path++; - if (*path == '/') { - *path = '\0'; - if (fspathcmp(real_path(path0), work_tree) == 0) { - memmove(path0, path + 1, len - (path - path0)); - return 0; - } - *path = '/'; - } - } - - /* check whole path */ - if (fspathcmp(real_path(path0), work_tree) == 0) { - *path0 = '\0'; - return 0; - } - - return -1; -} - -/* - * Normalize "path", prepending the "prefix" for relative paths. If - * remaining_prefix is not NULL, return the actual prefix still - * remains in the path. For example, prefix = sub1/sub2/ and path is - * - * foo -> sub1/sub2/foo (full prefix) - * ../foo -> sub1/foo (remaining prefix is sub1/) - * ../../bar -> bar (no remaining prefix) - * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix) - * `pwd`/../bar -> sub1/bar (no remaining prefix) - */ -char *prefix_path_gently(const char *prefix, int len, - int *remaining_prefix, const char *path) -{ - const char *orig = path; - char *sanitized; - if (is_absolute_path(orig)) { - sanitized = xmallocz(strlen(path)); - if (remaining_prefix) - *remaining_prefix = 0; - if (normalize_path_copy_len(sanitized, path, remaining_prefix)) { - free(sanitized); - return NULL; - } - if (abspath_part_inside_repo(sanitized)) { - free(sanitized); - return NULL; - } - } else { - sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path); - if (remaining_prefix) - *remaining_prefix = len; - if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) { - free(sanitized); - return NULL; - } - } - return sanitized; -} - -char *prefix_path(const char *prefix, int len, const char *path) -{ - char *r = prefix_path_gently(prefix, len, NULL, path); - if (!r) - die(_("'%s' is outside repository"), path); - return r; -} - -int path_inside_repo(const char *prefix, const char *path) -{ - int len = prefix ? strlen(prefix) : 0; - char *r = prefix_path_gently(prefix, len, NULL, path); - if (r) { - free(r); - return 1; - } - return 0; -} - -int check_filename(const char *prefix, const char *arg) -{ - char *to_free = NULL; - struct stat st; - - if (skip_prefix(arg, ":/", &arg)) { - if (!*arg) /* ":/" is root dir, always exists */ - return 1; - prefix = NULL; - } else if (skip_prefix(arg, ":!", &arg) || - skip_prefix(arg, ":^", &arg)) { - if (!*arg) /* excluding everything is silly, but allowed */ - return 1; - } - - if (prefix) - arg = to_free = prefix_filename(prefix, arg); - - if (!lstat(arg, &st)) { - free(to_free); - return 1; /* file exists */ - } - if (is_missing_file_error(errno)) { - free(to_free); - return 0; /* file does not exist */ - } - die_errno(_("failed to stat '%s'"), arg); -} - -static void NORETURN die_verify_filename(struct repository *r, - const char *prefix, - const char *arg, - int diagnose_misspelt_rev) -{ - if (!diagnose_misspelt_rev) - die(_("%s: no such path in the working tree.\n" - "Use 'git <command> -- <path>...' to specify paths that do not exist locally."), - arg); - /* - * Saying "'(icase)foo' does not exist in the index" when the - * user gave us ":(icase)foo" is just stupid. A magic pathspec - * begins with a colon and is followed by a non-alnum; do not - * let maybe_die_on_misspelt_object_name() even trigger. - */ - if (!(arg[0] == ':' && !isalnum(arg[1]))) - maybe_die_on_misspelt_object_name(r, arg, prefix); - - /* ... or fall back the most general message. */ - die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n" - "Use '--' to separate paths from revisions, like this:\n" - "'git <command> [<revision>...] -- [<file>...]'"), arg); - -} - -/* - * Check for arguments that don't resolve as actual files, - * but which look sufficiently like pathspecs that we'll consider - * them such for the purposes of rev/pathspec DWIM parsing. - */ -static int looks_like_pathspec(const char *arg) -{ - /* anything with a wildcard character */ - if (!no_wildcard(arg)) - return 1; - - /* long-form pathspec magic */ - if (starts_with(arg, ":(")) - return 1; - - return 0; -} - -/* - * Verify a filename that we got as an argument for a pathspec - * entry. Note that a filename that begins with "-" never verifies - * as true, because even if such a filename were to exist, we want - * it to be preceded by the "--" marker (or we want the user to - * use a format like "./-filename") - * - * The "diagnose_misspelt_rev" is used to provide a user-friendly - * diagnosis when dying upon finding that "name" is not a pathname. - * If set to 1, the diagnosis will try to diagnose "name" as an - * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis - * will only complain about an inexisting file. - * - * This function is typically called to check that a "file or rev" - * argument is unambiguous. In this case, the caller will want - * diagnose_misspelt_rev == 1 when verifying the first non-rev - * argument (which could have been a revision), and - * diagnose_misspelt_rev == 0 for the next ones (because we already - * saw a filename, there's not ambiguity anymore). - */ -void verify_filename(const char *prefix, - const char *arg, - int diagnose_misspelt_rev) -{ - if (*arg == '-') - die(_("option '%s' must come before non-option arguments"), arg); - if (looks_like_pathspec(arg) || check_filename(prefix, arg)) - return; - die_verify_filename(the_repository, prefix, arg, diagnose_misspelt_rev); -} - -/* - * Opposite of the above: the command line did not have -- marker - * and we parsed the arg as a refname. It should not be interpretable - * as a filename. - */ -void verify_non_filename(const char *prefix, const char *arg) -{ - if (!is_inside_work_tree() || is_inside_git_dir()) - return; - if (*arg == '-') - return; /* flag */ - if (!check_filename(prefix, arg)) - return; - die(_("ambiguous argument '%s': both revision and filename\n" - "Use '--' to separate paths from revisions, like this:\n" - "'git <command> [<revision>...] -- [<file>...]'"), arg); -} - -int get_common_dir(struct strbuf *sb, const char *gitdir) -{ - const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT); - if (git_env_common_dir) { - strbuf_addstr(sb, git_env_common_dir); - return 1; - } else { - return get_common_dir_noenv(sb, gitdir); - } -} - -int get_common_dir_noenv(struct strbuf *sb, const char *gitdir) -{ - struct strbuf data = STRBUF_INIT; - struct strbuf path = STRBUF_INIT; - int ret = 0; - - strbuf_addf(&path, "%s/commondir", gitdir); - if (file_exists(path.buf)) { - if (strbuf_read_file(&data, path.buf, 0) <= 0) - die_errno(_("failed to read %s"), path.buf); - while (data.len && (data.buf[data.len - 1] == '\n' || - data.buf[data.len - 1] == '\r')) - data.len--; - data.buf[data.len] = '\0'; - strbuf_reset(&path); - if (!is_absolute_path(data.buf)) - strbuf_addf(&path, "%s/", gitdir); - strbuf_addbuf(&path, &data); - strbuf_add_real_path(sb, path.buf); - ret = 1; - } else { - strbuf_addstr(sb, gitdir); - } - - strbuf_release(&data); - strbuf_release(&path); - return ret; -} - -/* - * Test if it looks like we're at a git directory. - * We want to see: - * - * - either an objects/ directory _or_ the proper - * GIT_OBJECT_DIRECTORY environment variable - * - a refs/ directory - * - either a HEAD symlink or a HEAD file that is formatted as - * a proper "ref:", or a regular file HEAD that has a properly - * formatted sha1 object name. - */ -int is_git_directory(const char *suspect) -{ - struct strbuf path = STRBUF_INIT; - int ret = 0; - size_t len; - - /* Check worktree-related signatures */ - strbuf_addstr(&path, suspect); - strbuf_complete(&path, '/'); - strbuf_addstr(&path, "HEAD"); - if (validate_headref(path.buf)) - goto done; - - strbuf_reset(&path); - get_common_dir(&path, suspect); - len = path.len; - - /* Check non-worktree-related signatures */ - if (getenv(DB_ENVIRONMENT)) { - if (access(getenv(DB_ENVIRONMENT), X_OK)) - goto done; - } - else { - strbuf_setlen(&path, len); - strbuf_addstr(&path, "/objects"); - if (access(path.buf, X_OK)) - goto done; - } - - strbuf_setlen(&path, len); - strbuf_addstr(&path, "/refs"); - if (access(path.buf, X_OK)) - goto done; - - ret = 1; -done: - strbuf_release(&path); - return ret; -} - -int is_nonbare_repository_dir(struct strbuf *path) -{ - int ret = 0; - int gitfile_error; - size_t orig_path_len = path->len; - assert(orig_path_len != 0); - strbuf_complete(path, '/'); - strbuf_addstr(path, ".git"); - if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf)) - ret = 1; - if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED || - gitfile_error == READ_GITFILE_ERR_READ_FAILED) - ret = 1; - strbuf_setlen(path, orig_path_len); - return ret; -} - -int is_inside_git_dir(void) -{ - if (inside_git_dir < 0) - inside_git_dir = is_inside_dir(get_git_dir()); - return inside_git_dir; -} - -int is_inside_work_tree(void) -{ - if (inside_work_tree < 0) - inside_work_tree = is_inside_dir(get_git_work_tree()); - return inside_work_tree; -} - -void setup_work_tree(void) -{ - const char *work_tree; - static int initialized = 0; - - if (initialized) - return; - - if (work_tree_config_is_bogus) - die(_("unable to set up work tree using invalid config")); - - work_tree = get_git_work_tree(); - if (!work_tree || chdir_notify(work_tree)) - die(_("this operation must be run in a work tree")); - - /* - * Make sure subsequent git processes find correct worktree - * if $GIT_WORK_TREE is set relative - */ - if (getenv(GIT_WORK_TREE_ENVIRONMENT)) - setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1); - - initialized = 1; -} - -static int read_worktree_config(const char *var, const char *value, void *vdata) -{ - struct repository_format *data = vdata; - - if (strcmp(var, "core.bare") == 0) { - data->is_bare = git_config_bool(var, value); - } else if (strcmp(var, "core.worktree") == 0) { - if (!value) - return config_error_nonbool(var); - free(data->work_tree); - data->work_tree = xstrdup(value); - } - return 0; -} - -static int check_repo_format(const char *var, const char *value, void *vdata) -{ - struct repository_format *data = vdata; - const char *ext; - - if (strcmp(var, "core.repositoryformatversion") == 0) - data->version = git_config_int(var, value); - else if (skip_prefix(var, "extensions.", &ext)) { - /* - * record any known extensions here; otherwise, - * we fall through to recording it as unknown, and - * check_repository_format will complain - */ - if (!strcmp(ext, "noop")) - ; - else if (!strcmp(ext, "preciousobjects")) - data->precious_objects = git_config_bool(var, value); - else if (!strcmp(ext, "partialclone")) { - if (!value) - return config_error_nonbool(var); - data->partial_clone = xstrdup(value); - } else if (!strcmp(ext, "worktreeconfig")) - data->worktree_config = git_config_bool(var, value); - else - string_list_append(&data->unknown_extensions, ext); - } - - return read_worktree_config(var, value, vdata); -} - -static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok) -{ - struct strbuf sb = STRBUF_INIT; - struct strbuf err = STRBUF_INIT; - int has_common; - - has_common = get_common_dir(&sb, gitdir); - strbuf_addstr(&sb, "/config"); - read_repository_format(candidate, sb.buf); - strbuf_release(&sb); - - /* - * For historical use of check_repository_format() in git-init, - * we treat a missing config as a silent "ok", even when nongit_ok - * is unset. - */ - if (candidate->version < 0) - return 0; - - if (verify_repository_format(candidate, &err) < 0) { - if (nongit_ok) { - warning("%s", err.buf); - strbuf_release(&err); - *nongit_ok = -1; - return -1; - } - die("%s", err.buf); - } - - repository_format_precious_objects = candidate->precious_objects; - repository_format_partial_clone = xstrdup_or_null(candidate->partial_clone); - repository_format_worktree_config = candidate->worktree_config; - string_list_clear(&candidate->unknown_extensions, 0); - - if (repository_format_worktree_config) { - /* - * pick up core.bare and core.worktree from per-worktree - * config if present - */ - strbuf_addf(&sb, "%s/config.worktree", gitdir); - git_config_from_file(read_worktree_config, sb.buf, candidate); - strbuf_release(&sb); - has_common = 0; - } - - if (!has_common) { - if (candidate->is_bare != -1) { - is_bare_repository_cfg = candidate->is_bare; - if (is_bare_repository_cfg == 1) - inside_work_tree = -1; - } - if (candidate->work_tree) { - free(git_work_tree_cfg); - git_work_tree_cfg = xstrdup(candidate->work_tree); - inside_work_tree = -1; - } - } - - return 0; -} - -static void init_repository_format(struct repository_format *format) -{ - const struct repository_format fresh = REPOSITORY_FORMAT_INIT; - - memcpy(format, &fresh, sizeof(fresh)); -} - -int read_repository_format(struct repository_format *format, const char *path) -{ - clear_repository_format(format); - git_config_from_file(check_repo_format, path, format); - if (format->version == -1) - clear_repository_format(format); - return format->version; -} - -void clear_repository_format(struct repository_format *format) -{ - string_list_clear(&format->unknown_extensions, 0); - free(format->work_tree); - free(format->partial_clone); - init_repository_format(format); -} - -int verify_repository_format(const struct repository_format *format, - struct strbuf *err) -{ - if (GIT_REPO_VERSION_READ < format->version) { - strbuf_addf(err, _("Expected git repo version <= %d, found %d"), - GIT_REPO_VERSION_READ, format->version); - return -1; - } - - if (format->version >= 1 && format->unknown_extensions.nr) { - int i; - - strbuf_addstr(err, _("unknown repository extensions found:")); - - for (i = 0; i < format->unknown_extensions.nr; i++) - strbuf_addf(err, "\n\t%s", - format->unknown_extensions.items[i].string); - return -1; - } - - return 0; -} - -void read_gitfile_error_die(int error_code, const char *path, const char *dir) -{ - switch (error_code) { - case READ_GITFILE_ERR_STAT_FAILED: - case READ_GITFILE_ERR_NOT_A_FILE: - /* non-fatal; follow return path */ - break; - case READ_GITFILE_ERR_OPEN_FAILED: - die_errno(_("error opening '%s'"), path); - case READ_GITFILE_ERR_TOO_LARGE: - die(_("too large to be a .git file: '%s'"), path); - case READ_GITFILE_ERR_READ_FAILED: - die(_("error reading %s"), path); - case READ_GITFILE_ERR_INVALID_FORMAT: - die(_("invalid gitfile format: %s"), path); - case READ_GITFILE_ERR_NO_PATH: - die(_("no path in gitfile: %s"), path); - case READ_GITFILE_ERR_NOT_A_REPO: - die(_("not a git repository: %s"), dir); - default: - BUG("unknown error code"); - } -} - -/* - * Try to read the location of the git directory from the .git file, - * return path to git directory if found. The return value comes from - * a shared buffer. - * - * On failure, if return_error_code is not NULL, return_error_code - * will be set to an error code and NULL will be returned. If - * return_error_code is NULL the function will die instead (for most - * cases). - */ -const char *read_gitfile_gently(const char *path, int *return_error_code) -{ - const int max_file_size = 1 << 20; /* 1MB */ - int error_code = 0; - char *buf = NULL; - char *dir = NULL; - const char *slash; - struct stat st; - int fd; - ssize_t len; - - if (stat(path, &st)) { - /* NEEDSWORK: discern between ENOENT vs other errors */ - error_code = READ_GITFILE_ERR_STAT_FAILED; - goto cleanup_return; - } - if (!S_ISREG(st.st_mode)) { - error_code = READ_GITFILE_ERR_NOT_A_FILE; - goto cleanup_return; - } - if (st.st_size > max_file_size) { - error_code = READ_GITFILE_ERR_TOO_LARGE; - goto cleanup_return; - } - fd = open(path, O_RDONLY); - if (fd < 0) { - error_code = READ_GITFILE_ERR_OPEN_FAILED; - goto cleanup_return; - } - buf = xmallocz(st.st_size); - len = read_in_full(fd, buf, st.st_size); - close(fd); - if (len != st.st_size) { - error_code = READ_GITFILE_ERR_READ_FAILED; - goto cleanup_return; - } - if (!starts_with(buf, "gitdir: ")) { - error_code = READ_GITFILE_ERR_INVALID_FORMAT; - goto cleanup_return; - } - while (buf[len - 1] == '\n' || buf[len - 1] == '\r') - len--; - if (len < 9) { - error_code = READ_GITFILE_ERR_NO_PATH; - goto cleanup_return; - } - buf[len] = '\0'; - dir = buf + 8; - - if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) { - size_t pathlen = slash+1 - path; - dir = xstrfmt("%.*s%.*s", (int)pathlen, path, - (int)(len - 8), buf + 8); - free(buf); - buf = dir; - } - if (!is_git_directory(dir)) { - error_code = READ_GITFILE_ERR_NOT_A_REPO; - goto cleanup_return; - } - path = real_path(dir); - -cleanup_return: - if (return_error_code) - *return_error_code = error_code; - else if (error_code) - read_gitfile_error_die(error_code, path, dir); - - free(buf); - return error_code ? NULL : path; -} - -static const char *setup_explicit_git_dir(const char *gitdirenv, - struct strbuf *cwd, - struct repository_format *repo_fmt, - int *nongit_ok) -{ - const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); - const char *worktree; - char *gitfile; - int offset; - - if (PATH_MAX - 40 < strlen(gitdirenv)) - die(_("'$%s' too big"), GIT_DIR_ENVIRONMENT); - - gitfile = (char*)read_gitfile(gitdirenv); - if (gitfile) { - gitfile = xstrdup(gitfile); - gitdirenv = gitfile; - } - - if (!is_git_directory(gitdirenv)) { - if (nongit_ok) { - *nongit_ok = 1; - free(gitfile); - return NULL; - } - die(_("not a git repository: '%s'"), gitdirenv); - } - - if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) { - free(gitfile); - return NULL; - } - - /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */ - if (work_tree_env) - set_git_work_tree(work_tree_env); - else if (is_bare_repository_cfg > 0) { - if (git_work_tree_cfg) { - /* #22.2, #30 */ - warning("core.bare and core.worktree do not make sense"); - work_tree_config_is_bogus = 1; - } - - /* #18, #26 */ - set_git_dir(gitdirenv); - free(gitfile); - return NULL; - } - else if (git_work_tree_cfg) { /* #6, #14 */ - if (is_absolute_path(git_work_tree_cfg)) - set_git_work_tree(git_work_tree_cfg); - else { - char *core_worktree; - if (chdir(gitdirenv)) - die_errno(_("cannot chdir to '%s'"), gitdirenv); - if (chdir(git_work_tree_cfg)) - die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg); - core_worktree = xgetcwd(); - if (chdir(cwd->buf)) - die_errno(_("cannot come back to cwd")); - set_git_work_tree(core_worktree); - free(core_worktree); - } - } - else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) { - /* #16d */ - set_git_dir(gitdirenv); - free(gitfile); - return NULL; - } - else /* #2, #10 */ - set_git_work_tree("."); - - /* set_git_work_tree() must have been called by now */ - worktree = get_git_work_tree(); - - /* both get_git_work_tree() and cwd are already normalized */ - if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */ - set_git_dir(gitdirenv); - free(gitfile); - return NULL; - } - - offset = dir_inside_of(cwd->buf, worktree); - if (offset >= 0) { /* cwd inside worktree? */ - set_git_dir(real_path(gitdirenv)); - if (chdir(worktree)) - die_errno(_("cannot chdir to '%s'"), worktree); - strbuf_addch(cwd, '/'); - free(gitfile); - return cwd->buf + offset; - } - - /* cwd outside worktree */ - set_git_dir(gitdirenv); - free(gitfile); - return NULL; -} - -static const char *setup_discovered_git_dir(const char *gitdir, - struct strbuf *cwd, int offset, - struct repository_format *repo_fmt, - int *nongit_ok) -{ - if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok)) - return NULL; - - /* --work-tree is set without --git-dir; use discovered one */ - if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { - char *to_free = NULL; - const char *ret; - - if (offset != cwd->len && !is_absolute_path(gitdir)) - gitdir = to_free = real_pathdup(gitdir, 1); - if (chdir(cwd->buf)) - die_errno(_("cannot come back to cwd")); - ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); - free(to_free); - return ret; - } - - /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */ - if (is_bare_repository_cfg > 0) { - set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir)); - if (chdir(cwd->buf)) - die_errno(_("cannot come back to cwd")); - return NULL; - } - - /* #0, #1, #5, #8, #9, #12, #13 */ - set_git_work_tree("."); - if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT)) - set_git_dir(gitdir); - inside_git_dir = 0; - inside_work_tree = 1; - if (offset == cwd->len) - return NULL; - - /* Make "offset" point past the '/' (already the case for root dirs) */ - if (offset != offset_1st_component(cwd->buf)) - offset++; - /* Add a '/' at the end */ - strbuf_addch(cwd, '/'); - return cwd->buf + offset; -} - -/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */ -static const char *setup_bare_git_dir(struct strbuf *cwd, int offset, - struct repository_format *repo_fmt, - int *nongit_ok) -{ - int root_len; - - if (check_repository_format_gently(".", repo_fmt, nongit_ok)) - return NULL; - - setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); - - /* --work-tree is set without --git-dir; use discovered one */ - if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) { - static const char *gitdir; - - gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset); - if (chdir(cwd->buf)) - die_errno(_("cannot come back to cwd")); - return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok); - } - - inside_git_dir = 1; - inside_work_tree = 0; - if (offset != cwd->len) { - if (chdir(cwd->buf)) - die_errno(_("cannot come back to cwd")); - root_len = offset_1st_component(cwd->buf); - strbuf_setlen(cwd, offset > root_len ? offset : root_len); - set_git_dir(cwd->buf); - } - else - set_git_dir("."); - return NULL; -} - -static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len) -{ - struct stat buf; - if (stat(path, &buf)) { - die_errno(_("failed to stat '%*s%s%s'"), - prefix_len, - prefix ? prefix : "", - prefix ? "/" : "", path); - } - return buf.st_dev; -} - -/* - * A "string_list_each_func_t" function that canonicalizes an entry - * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or - * discards it if unusable. The presence of an empty entry in - * GIT_CEILING_DIRECTORIES turns off canonicalization for all - * subsequent entries. - */ -static int canonicalize_ceiling_entry(struct string_list_item *item, - void *cb_data) -{ - int *empty_entry_found = cb_data; - char *ceil = item->string; - - if (!*ceil) { - *empty_entry_found = 1; - return 0; - } else if (!is_absolute_path(ceil)) { - return 0; - } else if (*empty_entry_found) { - /* Keep entry but do not canonicalize it */ - return 1; - } else { - char *real_path = real_pathdup(ceil, 0); - if (!real_path) { - return 0; - } - free(item->string); - item->string = real_path; - return 1; - } -} - -enum discovery_result { - GIT_DIR_NONE = 0, - GIT_DIR_EXPLICIT, - GIT_DIR_DISCOVERED, - GIT_DIR_BARE, - /* these are errors */ - GIT_DIR_HIT_CEILING = -1, - GIT_DIR_HIT_MOUNT_POINT = -2, - GIT_DIR_INVALID_GITFILE = -3 -}; - -/* - * We cannot decide in this function whether we are in the work tree or - * not, since the config can only be read _after_ this function was called. - * - * Also, we avoid changing any global state (such as the current working - * directory) to allow early callers. - * - * The directory where the search should start needs to be passed in via the - * `dir` parameter; upon return, the `dir` buffer will contain the path of - * the directory where the search ended, and `gitdir` will contain the path of - * the discovered .git/ directory, if any. If `gitdir` is not absolute, it - * is relative to `dir` (i.e. *not* necessarily the cwd). - */ -static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir, - struct strbuf *gitdir, - int die_on_error) -{ - const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); - struct string_list ceiling_dirs = STRING_LIST_INIT_DUP; - const char *gitdirenv; - int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1; - dev_t current_device = 0; - int one_filesystem = 1; - - /* - * If GIT_DIR is set explicitly, we're not going - * to do any discovery, but we still do repository - * validation. - */ - gitdirenv = getenv(GIT_DIR_ENVIRONMENT); - if (gitdirenv) { - strbuf_addstr(gitdir, gitdirenv); - return GIT_DIR_EXPLICIT; - } - - if (env_ceiling_dirs) { - int empty_entry_found = 0; - - string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1); - filter_string_list(&ceiling_dirs, 0, - canonicalize_ceiling_entry, &empty_entry_found); - ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs); - string_list_clear(&ceiling_dirs, 0); - } - - if (ceil_offset < 0) - ceil_offset = min_offset - 2; - - /* - * Test in the following order (relative to the dir): - * - .git (file containing "gitdir: <path>") - * - .git/ - * - ./ (bare) - * - ../.git - * - ../.git/ - * - ../ (bare) - * - ../../.git - * etc. - */ - one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0); - if (one_filesystem) - current_device = get_device_or_die(dir->buf, NULL, 0); - for (;;) { - int offset = dir->len, error_code = 0; - - if (offset > min_offset) - strbuf_addch(dir, '/'); - strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT); - gitdirenv = read_gitfile_gently(dir->buf, die_on_error ? - NULL : &error_code); - if (!gitdirenv) { - if (die_on_error || - error_code == READ_GITFILE_ERR_NOT_A_FILE) { - /* NEEDSWORK: fail if .git is not file nor dir */ - if (is_git_directory(dir->buf)) - gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT; - } else if (error_code != READ_GITFILE_ERR_STAT_FAILED) - return GIT_DIR_INVALID_GITFILE; - } - strbuf_setlen(dir, offset); - if (gitdirenv) { - strbuf_addstr(gitdir, gitdirenv); - return GIT_DIR_DISCOVERED; - } - - if (is_git_directory(dir->buf)) { - strbuf_addstr(gitdir, "."); - return GIT_DIR_BARE; - } - - if (offset <= min_offset) - return GIT_DIR_HIT_CEILING; - - while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset])) - ; /* continue */ - if (offset <= ceil_offset) - return GIT_DIR_HIT_CEILING; - - strbuf_setlen(dir, offset > min_offset ? offset : min_offset); - if (one_filesystem && - current_device != get_device_or_die(dir->buf, NULL, offset)) - return GIT_DIR_HIT_MOUNT_POINT; - } -} - -int discover_git_directory(struct strbuf *commondir, - struct strbuf *gitdir) -{ - struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; - size_t gitdir_offset = gitdir->len, cwd_len; - size_t commondir_offset = commondir->len; - struct repository_format candidate = REPOSITORY_FORMAT_INIT; - - if (strbuf_getcwd(&dir)) - return -1; - - cwd_len = dir.len; - if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) { - strbuf_release(&dir); - return -1; - } - - /* - * The returned gitdir is relative to dir, and if dir does not reflect - * the current working directory, we simply make the gitdir absolute. - */ - if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) { - /* Avoid a trailing "/." */ - if (!strcmp(".", gitdir->buf + gitdir_offset)) - strbuf_setlen(gitdir, gitdir_offset); - else - strbuf_addch(&dir, '/'); - strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len); - } - - get_common_dir(commondir, gitdir->buf + gitdir_offset); - - strbuf_reset(&dir); - strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset); - read_repository_format(&candidate, dir.buf); - strbuf_release(&dir); - - if (verify_repository_format(&candidate, &err) < 0) { - warning("ignoring git dir '%s': %s", - gitdir->buf + gitdir_offset, err.buf); - strbuf_release(&err); - strbuf_setlen(commondir, commondir_offset); - strbuf_setlen(gitdir, gitdir_offset); - clear_repository_format(&candidate); - return -1; - } - - clear_repository_format(&candidate); - return 0; -} - -const char *setup_git_directory_gently(int *nongit_ok) -{ - static struct strbuf cwd = STRBUF_INIT; - struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT; - const char *prefix = NULL; - struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; - - /* - * We may have read an incomplete configuration before - * setting-up the git directory. If so, clear the cache so - * that the next queries to the configuration reload complete - * configuration (including the per-repo config file that we - * ignored previously). - */ - git_config_clear(); - - /* - * Let's assume that we are in a git repository. - * If it turns out later that we are somewhere else, the value will be - * updated accordingly. - */ - if (nongit_ok) - *nongit_ok = 0; - - if (strbuf_getcwd(&cwd)) - die_errno(_("Unable to read current working directory")); - strbuf_addbuf(&dir, &cwd); - - switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) { - case GIT_DIR_EXPLICIT: - prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok); - break; - case GIT_DIR_DISCOVERED: - if (dir.len < cwd.len && chdir(dir.buf)) - die(_("cannot change to '%s'"), dir.buf); - prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len, - &repo_fmt, nongit_ok); - break; - case GIT_DIR_BARE: - if (dir.len < cwd.len && chdir(dir.buf)) - die(_("cannot change to '%s'"), dir.buf); - prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok); - break; - case GIT_DIR_HIT_CEILING: - if (!nongit_ok) - die(_("not a git repository (or any of the parent directories): %s"), - DEFAULT_GIT_DIR_ENVIRONMENT); - *nongit_ok = 1; - break; - case GIT_DIR_HIT_MOUNT_POINT: - if (!nongit_ok) - die(_("not a git repository (or any parent up to mount point %s)\n" - "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."), - dir.buf); - *nongit_ok = 1; - break; - case GIT_DIR_NONE: - /* - * As a safeguard against setup_git_directory_gently_1 returning - * this value, fallthrough to BUG. Otherwise it is possible to - * set startup_info->have_repository to 1 when we did nothing to - * find a repository. - */ - default: - BUG("unhandled setup_git_directory_1() result"); - } - - /* - * At this point, nongit_ok is stable. If it is non-NULL and points - * to a non-zero value, then this means that we haven't found a - * repository and that the caller expects startup_info to reflect - * this. - * - * Regardless of the state of nongit_ok, startup_info->prefix and - * the GIT_PREFIX environment variable must always match. For details - * see Documentation/config/alias.txt. - */ - if (nongit_ok && *nongit_ok) { - startup_info->have_repository = 0; - startup_info->prefix = NULL; - setenv(GIT_PREFIX_ENVIRONMENT, "", 1); - } else { - startup_info->have_repository = 1; - startup_info->prefix = prefix; - if (prefix) - setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1); - else - setenv(GIT_PREFIX_ENVIRONMENT, "", 1); - } - - /* - * Not all paths through the setup code will call 'set_git_dir()' (which - * directly sets up the environment) so in order to guarantee that the - * environment is in a consistent state after setup, explicitly setup - * the environment if we have a repository. - * - * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some - * code paths so we also need to explicitly setup the environment if - * the user has set GIT_DIR. It may be beneficial to disallow bogus - * GIT_DIR values at some point in the future. - */ - if (/* GIT_DIR_EXPLICIT, GIT_DIR_DISCOVERED, GIT_DIR_BARE */ - startup_info->have_repository || - /* GIT_DIR_EXPLICIT */ - getenv(GIT_DIR_ENVIRONMENT)) { - if (!the_repository->gitdir) { - const char *gitdir = getenv(GIT_DIR_ENVIRONMENT); - if (!gitdir) - gitdir = DEFAULT_GIT_DIR_ENVIRONMENT; - setup_git_env(gitdir); - } - if (startup_info->have_repository) - repo_set_hash_algo(the_repository, repo_fmt.hash_algo); - } - - strbuf_release(&dir); - strbuf_release(&gitdir); - clear_repository_format(&repo_fmt); - - return prefix; -} - -int git_config_perm(const char *var, const char *value) -{ - int i; - char *endptr; - - if (value == NULL) - return PERM_GROUP; - - if (!strcmp(value, "umask")) - return PERM_UMASK; - if (!strcmp(value, "group")) - return PERM_GROUP; - if (!strcmp(value, "all") || - !strcmp(value, "world") || - !strcmp(value, "everybody")) - return PERM_EVERYBODY; - - /* Parse octal numbers */ - i = strtol(value, &endptr, 8); - - /* If not an octal number, maybe true/false? */ - if (*endptr != 0) - return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; - - /* - * Treat values 0, 1 and 2 as compatibility cases, otherwise it is - * a chmod value to restrict to. - */ - switch (i) { - case PERM_UMASK: /* 0 */ - return PERM_UMASK; - case OLD_PERM_GROUP: /* 1 */ - return PERM_GROUP; - case OLD_PERM_EVERYBODY: /* 2 */ - return PERM_EVERYBODY; - } - - /* A filemode value was given: 0xxx */ - - if ((i & 0600) != 0600) - die(_("problem with core.sharedRepository filemode value " - "(0%.3o).\nThe owner of files must always have " - "read and write permissions."), i); - - /* - * Mask filemode value. Others can not get write permission. - * x flags for directories are handled separately. - */ - return -(i & 0666); -} - -void check_repository_format(void) -{ - struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; - check_repository_format_gently(get_git_dir(), &repo_fmt, NULL); - startup_info->have_repository = 1; - clear_repository_format(&repo_fmt); -} - -/* - * Returns the "prefix", a path to the current working directory - * relative to the work tree root, or NULL, if the current working - * directory is not a strict subdirectory of the work tree root. The - * prefix always ends with a '/' character. - */ -const char *setup_git_directory(void) -{ - return setup_git_directory_gently(NULL); -} - -const char *resolve_gitdir_gently(const char *suspect, int *return_error_code) -{ - if (is_git_directory(suspect)) - return suspect; - return read_gitfile_gently(suspect, return_error_code); -} - -/* if any standard file descriptor is missing open it to /dev/null */ -void sanitize_stdfds(void) -{ - int fd = open("/dev/null", O_RDWR, 0); - while (fd != -1 && fd < 2) - fd = dup(fd); - if (fd == -1) - die_errno(_("open /dev/null or dup failed")); - if (fd > 2) - close(fd); -} - -int daemonize(void) -{ -#ifdef NO_POSIX_GOODIES - errno = ENOSYS; - return -1; -#else - switch (fork()) { - case 0: - break; - case -1: - die_errno(_("fork failed")); - default: - exit(0); - } - if (setsid() == -1) - die_errno(_("setsid failed")); - close(0); - close(1); - close(2); - sanitize_stdfds(); - return 0; -#endif -} |