/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
*/
const char *read_gitfile_gently(const char *path)
{
char *buf;
struct stat st;
int fd;
size_t len;
if (stat(path, &st))
return NULL;
if (!S_ISREG(st.st_mode))
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0)
die_errno("Error opening '%s'", path);
buf = xmalloc(st.st_size + 1);
len = read_in_full(fd, buf, st.st_size);
close(fd);
if (len != st.st_size)
die("Error reading %s", path);
buf[len] = '\0';
if (prefixcmp(buf, "gitdir: "))
die("Invalid gitfile format: %s", path);
while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
len--;
if (len < 9)
die("No path in gitfile: %s", path);
buf[len] = '\0';
if (!is_git_directory(buf + 8))
die("Not a git repository: %s", buf + 8);
path = make_absolute_path(buf + 8);
free(buf);
return path;
}
/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
*/
const char *read_gitfile(const char *path)
{
char *buf;
char *dir;
const char *slash;
struct stat st;
int fd;
ssize_t len;
if (stat(path, &st))
return NULL;
if (!S_ISREG(st.st_mode))
return NULL;
fd = open(path, O_RDONLY);
if (fd < 0)
die_errno("Error opening '%s'", path);
buf = xmalloc(st.st_size + 1);
len = read_in_full(fd, buf, st.st_size);
close(fd);
if (len != st.st_size)
die("Error reading %s", path);
buf[len] = '\0';
if (!starts_with(buf, "gitdir: "))
die("Invalid gitfile format: %s", path);
while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
len--;
if (len < 9)
die("No path in gitfile: %s", path);
buf[len] = '\0';
dir = buf + 8;
if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
size_t pathlen = slash+1 - path;
size_t dirlen = pathlen + len - 8;
dir = xmalloc(dirlen + 1);
strncpy(dir, path, pathlen);
strncpy(dir + pathlen, buf + 8, len - 8);
dir[dirlen] = '\0';
free(buf);
buf = dir;
}
if (!is_git_directory(dir))
die("Not a git repository: %s", dir);
update_linked_gitdir(path, dir);
path = real_path(dir);
free(buf);
return path;
}
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;
}
/*
* Prep grep structures for a submodule grep
* sha1: the sha1 of the submodule or NULL if using the working tree
* filename: name of the submodule including tree name of parent
* path: location of the submodule
*/
static int grep_submodule(struct grep_opt *opt, const unsigned char *sha1,
const char *filename, const char *path)
{
if (!is_submodule_initialized(path))
return 0;
if (!is_submodule_populated(path)) {
/*
* If searching history, check for the presense of the
* submodule's gitdir before skipping the submodule.
*/
if (sha1) {
const struct submodule *sub =
submodule_from_path(null_sha1, path);
if (sub)
path = git_path("modules/%s", sub->name);
if (!(is_directory(path) && is_git_directory(path)))
return 0;
} else {
return 0;
}
}
#ifndef NO_PTHREADS
if (num_threads) {
add_work(opt, GREP_SOURCE_SUBMODULE, filename, path, sha1);
return 0;
} else
#endif
{
struct work_item w;
int hit;
grep_source_init(&w.source, GREP_SOURCE_SUBMODULE,
filename, path, sha1);
strbuf_init(&w.out, 0);
opt->output_priv = &w;
hit = grep_submodule_launch(opt, &w.source);
write_or_die(1, w.out.buf, w.out.len);
grep_source_clear(&w.source);
strbuf_release(&w.out);
return hit;
}
}
static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
{
static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
static char *bundle_suffix[] = { ".bundle", "" };
size_t baselen = path->len;
struct stat st;
int i;
for (i = 0; i < ARRAY_SIZE(suffix); i++) {
strbuf_setlen(path, baselen);
strbuf_addstr(path, suffix[i]);
if (stat(path->buf, &st))
continue;
if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
*is_bundle = 0;
return path->buf;
} else if (S_ISREG(st.st_mode) && st.st_size > 8) {
/* Is it a "gitfile"? */
char signature[8];
const char *dst;
int len, fd = open(path->buf, O_RDONLY);
if (fd < 0)
continue;
len = read_in_full(fd, signature, 8);
close(fd);
if (len != 8 || strncmp(signature, "gitdir: ", 8))
continue;
dst = read_gitfile(path->buf);
if (dst) {
*is_bundle = 0;
return dst;
}
}
}
for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
strbuf_setlen(path, baselen);
strbuf_addstr(path, bundle_suffix[i]);
if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
*is_bundle = 1;
return path->buf;
}
}
return NULL;
}
static int do_submodule_path(struct strbuf *buf, const char *path,
const char *fmt, va_list args)
{
const char *git_dir;
struct strbuf git_submodule_common_dir = STRBUF_INIT;
struct strbuf git_submodule_dir = STRBUF_INIT;
const struct submodule *sub;
int err = 0;
strbuf_addstr(buf, path);
strbuf_complete(buf, '/');
strbuf_addstr(buf, ".git");
git_dir = read_gitfile(buf->buf);
if (git_dir) {
strbuf_reset(buf);
strbuf_addstr(buf, git_dir);
}
if (!is_git_directory(buf->buf)) {
gitmodules_config();
sub = submodule_from_path(null_sha1, path);
if (!sub) {
err = SUBMODULE_PATH_ERR_NOT_CONFIGURED;
goto cleanup;
}
strbuf_reset(buf);
strbuf_git_path(buf, "%s/%s", "modules", sub->name);
}
strbuf_addch(buf, '/');
strbuf_addbuf(&git_submodule_dir, buf);
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 err;
}
static char *get_repo_path(const char *repo, int *is_bundle)
{
static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
static char *bundle_suffix[] = { ".bundle", "" };
struct stat st;
int i;
for (i = 0; i < ARRAY_SIZE(suffix); i++) {
const char *path;
path = mkpath("%s%s", repo, suffix[i]);
if (stat(path, &st))
continue;
if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
*is_bundle = 0;
return xstrdup(absolute_path(path));
} else if (S_ISREG(st.st_mode) && st.st_size > 8) {
/* Is it a "gitfile"? */
char signature[8];
int len, fd = open(path, O_RDONLY);
if (fd < 0)
continue;
len = read_in_full(fd, signature, 8);
close(fd);
if (len != 8 || strncmp(signature, "gitdir: ", 8))
continue;
path = read_gitfile(path);
if (path) {
*is_bundle = 0;
return xstrdup(absolute_path(path));
}
}
}
for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
const char *path;
path = mkpath("%s%s", repo, bundle_suffix[i]);
if (!stat(path, &st) && S_ISREG(st.st_mode)) {
*is_bundle = 1;
return xstrdup(absolute_path(path));
}
}
return NULL;
}
int find_git_root_directory(char* cwd, size_t cwd_size)
{
int offset;
if (!getcwd(cwd, cwd_size - 1)) {
fprintf(stderr, "Unable to read cwd");
return 1;
}
offset = strlen(cwd);
while (offset > 1) {
if (is_git_directory(cwd)) {
printf(".git found: %s/.git\n", cwd);
return 0;
}
while (offset-- && cwd[offset] != '/') ;
cwd[offset] = '\0';
}
return 0;
}
/*
* 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);
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;
}
/*
* 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.
*/
const char *setup_git_directory_gently(int *nongit_ok)
{
const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
static char cwd[PATH_MAX+1];
const char *gitdirenv;
const char *gitfile_dir;
int len, offset, ceil_offset;
/*
* 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 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) {
if (PATH_MAX - 40 < strlen(gitdirenv))
die("'$%s' too big", GIT_DIR_ENVIRONMENT);
if (is_git_directory(gitdirenv)) {
static char buffer[1024 + 1];
const char *retval;
if (!work_tree_env) {
retval = set_work_tree(gitdirenv);
/* config may override worktree */
if (check_repository_format_gently(nongit_ok))
return NULL;
return retval;
}
if (check_repository_format_gently(nongit_ok))
return NULL;
retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
get_git_work_tree());
if (!retval || !*retval)
return NULL;
set_git_dir(make_absolute_path(gitdirenv));
if (chdir(work_tree_env) < 0)
die_errno ("Could not chdir to '%s'", work_tree_env);
strcat(buffer, "/");
return retval;
}
if (nongit_ok) {
*nongit_ok = 1;
return NULL;
}
die("Not a git repository: '%s'", gitdirenv);
}
if (!getcwd(cwd, sizeof(cwd)-1))
die_errno("Unable to read current working directory");
ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
ceil_offset = 1;
/*
* Test in the following order (relative to the cwd):
* - .git (file containing "gitdir: <path>")
* - .git/
* - ./ (bare)
* - ../.git
* - ../.git/
* - ../ (bare)
* - ../../.git/
* etc.
*/
offset = len = strlen(cwd);
for (;;) {
gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
if (gitfile_dir) {
if (set_git_dir(gitfile_dir))
die("Repository setup failed");
break;
}
if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
break;
if (is_git_directory(".")) {
inside_git_dir = 1;
if (!work_tree_env)
inside_work_tree = 0;
if (offset != len) {
cwd[offset] = '\0';
setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
} else
setenv(GIT_DIR_ENVIRONMENT, ".", 1);
check_repository_format_gently(nongit_ok);
return NULL;
}
while (--offset > ceil_offset && cwd[offset] != '/');
if (offset <= ceil_offset) {
if (nongit_ok) {
if (chdir(cwd))
die_errno("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
}
if (chdir(".."))
die_errno("Cannot change to '%s/..'", cwd);
}
inside_git_dir = 0;
if (!work_tree_env)
inside_work_tree = 1;
git_work_tree_cfg = xstrndup(cwd, offset);
if (check_repository_format_gently(nongit_ok))
return NULL;
if (offset == len)
return NULL;
/* Make "offset" point to past the '/', and add a '/' at the end */
offset++;
cwd[len++] = '/';
cwd[len] = 0;
return cwd + offset;
}
/*
* 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.
*/
static const char *setup_git_directory_gently_1(int *nongit_ok)
{
const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
static struct strbuf cwd = STRBUF_INIT;
const char *gitdirenv, *ret;
char *gitfile;
int offset, offset_parent, ceil_offset = -1;
dev_t current_device = 0;
int one_filesystem = 1;
/*
* 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");
offset = cwd.len;
/*
* 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)
return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
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(cwd.buf, &ceiling_dirs);
string_list_clear(&ceiling_dirs, 0);
}
if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
ceil_offset = 1;
/*
* Test in the following order (relative to the cwd):
* - .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(".", NULL, 0);
for (;;) {
gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
if (gitfile)
gitdirenv = gitfile = xstrdup(gitfile);
else {
if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
}
if (gitdirenv) {
ret = setup_discovered_git_dir(gitdirenv,
&cwd, offset,
nongit_ok);
free(gitfile);
return ret;
}
free(gitfile);
if (is_git_directory("."))
return setup_bare_git_dir(&cwd, offset, nongit_ok);
offset_parent = offset;
while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
if (offset_parent <= ceil_offset)
return setup_nongit(cwd.buf, nongit_ok);
if (one_filesystem) {
dev_t parent_device = get_device_or_die("..", cwd.buf,
offset);
if (parent_device != current_device) {
if (nongit_ok) {
if (chdir(cwd.buf))
die_errno("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
strbuf_setlen(&cwd, offset);
die("Not a git repository (or any parent up to mount point %s)\n"
"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
cwd.buf);
}
}
if (chdir("..")) {
strbuf_setlen(&cwd, offset);
die_errno("Cannot change to '%s/..'", cwd.buf);
}
offset = offset_parent;
}
}
static const char *setup_explicit_git_dir(const char *gitdirenv,
struct strbuf *cwd,
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, 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("Could not chdir to '%s'", gitdirenv);
if (chdir(git_work_tree_cfg))
die_errno("Could not chdir to '%s'", git_work_tree_cfg);
core_worktree = xgetcwd();
if (chdir(cwd->buf))
die_errno("Could not 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("Could not chdir to '%s'", worktree);
strbuf_addch(cwd, '/');
free(gitfile);
return cwd->buf + offset;
}
/* cwd outside worktree */
set_git_dir(gitdirenv);
free(gitfile);
return NULL;
}
/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
*
* 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)) {
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 = xmalloc(st.st_size + 1);
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;
}
buf[len] = '\0';
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;
}
update_linked_gitdir(path, dir);
path = real_path(dir);
cleanup_return:
if (return_error_code)
*return_error_code = error_code;
else if (error_code) {
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:
assert(0);
}
}
free(buf);
return error_code ? NULL : path;
}
const char *resolve_gitdir(const char *suspect)
{
if (is_git_directory(suspect))
return suspect;
return read_gitfile(suspect);
}
/*
* 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 try access() for existence of "%s.git/.git",
* "%s/.git", "%s.git", "%s" in this order. The first one that exists is
* what we try.
*
* Second, we try chdir() to that. Upon failure, we return NULL.
*
* Then, we try if the current directory is a valid git repository.
* Upon failure, we return NULL.
*
* 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 char used_path[PATH_MAX];
static char validated_path[PATH_MAX];
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--;
if (PATH_MAX <= len)
return NULL;
strncpy(used_path, path, len); used_path[len] = 0 ;
strcpy(validated_path, used_path);
if (used_path[0] == '~') {
char *newpath = expand_user_path(used_path);
if (!newpath || (PATH_MAX - 10 < strlen(newpath))) {
free(newpath);
return NULL;
}
/*
* Copy back into the static buffer. A pity
* since newpath was not bounded, but other
* branches of the if are limited by PATH_MAX
* anyway.
*/
strcpy(used_path, newpath); free(newpath);
}
else if (PATH_MAX - 10 < len)
return NULL;
len = strlen(used_path);
for (i = 0; suffix[i]; i++) {
struct stat st;
strcpy(used_path + len, suffix[i]);
if (!stat(used_path, &st) &&
(S_ISREG(st.st_mode) ||
(S_ISDIR(st.st_mode) && is_git_directory(used_path)))) {
strcat(validated_path, suffix[i]);
break;
}
}
if (!suffix[i])
return NULL;
gitfile = read_gitfile(used_path) ;
if (gitfile)
strcpy(used_path, gitfile);
if (chdir(used_path))
return NULL;
path = validated_path;
}
else if (chdir(path))
return NULL;
if (access("objects", X_OK) == 0 && access("refs", X_OK) == 0 &&
validate_headref("HEAD") == 0) {
set_git_dir(".");
check_repository_format();
return path;
}
return NULL;
}
static const char *setup_explicit_git_dir(const char *gitdirenv,
char *cwd, int len,
int *nongit_ok)
{
const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
const char *worktree;
char *gitfile;
if (PATH_MAX - 40 < strlen(gitdirenv))
die("'$%s' too big", GIT_DIR_ENVIRONMENT);
gitfile = (char*)read_gitfile_gently(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, 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 */
die("core.bare and core.worktree do not make sense");
/* #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[PATH_MAX];
if (chdir(gitdirenv))
die_errno("Could not chdir to '%s'", gitdirenv);
if (chdir(git_work_tree_cfg))
die_errno("Could not chdir to '%s'", git_work_tree_cfg);
if (!getcwd(core_worktree, PATH_MAX))
die_errno("Could not get directory '%s'", git_work_tree_cfg);
if (chdir(cwd))
die_errno("Could not come back to cwd");
set_git_work_tree(core_worktree);
}
}
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, worktree)) { /* cwd == worktree */
set_git_dir(gitdirenv);
free(gitfile);
return NULL;
}
if (!prefixcmp(cwd, worktree) &&
cwd[strlen(worktree)] == '/') { /* cwd inside worktree */
set_git_dir(real_path(gitdirenv));
if (chdir(worktree))
die_errno("Could not chdir to '%s'", worktree);
cwd[len++] = '/';
cwd[len] = '\0';
free(gitfile);
return cwd + strlen(worktree) + 1;
}
/* cwd outside worktree */
set_git_dir(gitdirenv);
free(gitfile);
return NULL;
}
/*
* 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.
*/
static const char *setup_git_directory_gently_1(int *nongit_ok)
{
const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
static char cwd[PATH_MAX+1];
const char *gitdirenv, *ret;
char *gitfile;
int len, offset, ceil_offset;
dev_t current_device = 0;
int one_filesystem = 1;
/*
* 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 (!getcwd(cwd, sizeof(cwd)-1))
die_errno("Unable to read current working directory");
offset = len = strlen(cwd);
/*
* 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)
return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
ceil_offset = 1;
/*
* Test in the following order (relative to the cwd):
* - .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(".", NULL);
for (;;) {
gitfile = (char*)read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
if (gitfile)
gitdirenv = gitfile = xstrdup(gitfile);
else {
if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
}
if (gitdirenv) {
ret = setup_discovered_git_dir(gitdirenv,
cwd, offset, len,
nongit_ok);
free(gitfile);
return ret;
}
free(gitfile);
if (is_git_directory("."))
return setup_bare_git_dir(cwd, offset, len, nongit_ok);
while (--offset > ceil_offset && cwd[offset] != '/');
if (offset <= ceil_offset)
return setup_nongit(cwd, nongit_ok);
if (one_filesystem) {
dev_t parent_device = get_device_or_die("..", cwd);
if (parent_device != current_device) {
if (nongit_ok) {
if (chdir(cwd))
die_errno("Cannot come back to cwd");
*nongit_ok = 1;
return NULL;
}
cwd[offset] = '\0';
die("Not a git repository (or any parent up to mount parent %s)\n"
"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
}
}
if (chdir("..")) {
cwd[offset] = '\0';
die_errno("Cannot change to '%s/..'", cwd);
}
}
}