mirror of
https://github.com/git/git
synced 2024-08-28 12:09:19 +00:00
![Johannes Schindelin](/assets/img/avatar_default.png)
For historical reasons, Git searches for the .git/ directory (or the .git file) by changing the working directory successively to the parent directory of the current directory, until either anything was found or until a ceiling or a mount point is hit. Further global state may be changed in case a .git/ directory was found. We do have a use case, though, where we would like to find the .git/ directory without having any global state touched, though: when we read the early config e.g. for the pager or for alias expansion. Let's just move all of code that changes any global state out of the function `setup_git_directory_gently_1()` into `setup_git_directory_gently()`. In subsequent patches, we will use the _1() function in a new `discover_git_directory()` function that we will then use for the early config code. Note: the new loop is a *little* tricky, as we have to handle the root directory specially: we cannot simply strip away the last component including the slash, as the root directory only has that slash. To remedy that, we introduce the `min_offset` variable that holds the minimal length of an absolute path, and using that to special-case the root directory, including an early exit before trying to find the parent of the root directory. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1113 lines
29 KiB
C
1113 lines
29 KiB
C
#include "cache.h"
|
|
#include "dir.h"
|
|
#include "string-list.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 && !strncmp(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 (strcmp(real_path(path0), work_tree) == 0) {
|
|
memmove(path0, path + 1, len - (path - path0));
|
|
return 0;
|
|
}
|
|
*path = '/';
|
|
}
|
|
}
|
|
|
|
/* check whole path */
|
|
if (strcmp(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)
|
|
{
|
|
const char *name;
|
|
struct stat st;
|
|
|
|
if (starts_with(arg, ":/")) {
|
|
if (arg[2] == '\0') /* ":/" is root dir, always exists */
|
|
return 1;
|
|
name = arg + 2;
|
|
} else if (prefix)
|
|
name = prefix_filename(prefix, strlen(prefix), arg);
|
|
else
|
|
name = arg;
|
|
if (!lstat(name, &st))
|
|
return 1; /* file exists */
|
|
if (errno == ENOENT || errno == ENOTDIR)
|
|
return 0; /* file does not exist */
|
|
die_errno("failed to stat '%s'", arg);
|
|
}
|
|
|
|
static void NORETURN die_verify_filename(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(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);
|
|
|
|
}
|
|
|
|
/*
|
|
* 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("bad flag '%s' used after filename", arg);
|
|
if (check_filename(prefix, arg) || !no_wildcard(arg))
|
|
return;
|
|
die_verify_filename(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_addstr(sb, real_path(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_addf(&path, "%s/HEAD", suspect);
|
|
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, *git_dir;
|
|
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();
|
|
git_dir = get_git_dir();
|
|
if (!is_absolute_path(git_dir))
|
|
git_dir = real_path(get_git_dir());
|
|
if (!work_tree || chdir(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);
|
|
|
|
set_git_dir(remove_leading_path(git_dir, work_tree));
|
|
initialized = 1;
|
|
}
|
|
|
|
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
|
|
string_list_append(&data->unknown_extensions, ext);
|
|
} else 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);
|
|
data->work_tree = xstrdup(value);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
|
|
{
|
|
struct strbuf sb = STRBUF_INIT;
|
|
struct strbuf err = STRBUF_INIT;
|
|
struct repository_format candidate;
|
|
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;
|
|
string_list_clear(&candidate.unknown_extensions, 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 = candidate.work_tree;
|
|
inside_work_tree = -1;
|
|
}
|
|
} else {
|
|
free(candidate.work_tree);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int read_repository_format(struct repository_format *format, const char *path)
|
|
{
|
|
memset(format, 0, sizeof(*format));
|
|
format->version = -1;
|
|
format->is_bare = -1;
|
|
string_list_init(&format->unknown_extensions, 1);
|
|
git_config_from_file(check_repo_format, path, format);
|
|
return format->version;
|
|
}
|
|
|
|
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:
|
|
die("BUG: unknown error code");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 = 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,
|
|
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;
|
|
}
|
|
|
|
static const char *setup_discovered_git_dir(const char *gitdir,
|
|
struct strbuf *cwd, int offset,
|
|
int *nongit_ok)
|
|
{
|
|
if (check_repository_format_gently(gitdir, nongit_ok))
|
|
return NULL;
|
|
|
|
/* --work-tree is set without --git-dir; use discovered one */
|
|
if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
|
|
if (offset != cwd->len && !is_absolute_path(gitdir))
|
|
gitdir = real_pathdup(gitdir);
|
|
if (chdir(cwd->buf))
|
|
die_errno("Could not come back to cwd");
|
|
return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
|
|
}
|
|
|
|
/* #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("Could not 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,
|
|
int *nongit_ok)
|
|
{
|
|
int root_len;
|
|
|
|
if (check_repository_format_gently(".", 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) {
|
|
const char *gitdir;
|
|
|
|
gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
|
|
if (chdir(cwd->buf))
|
|
die_errno("Could not come back to cwd");
|
|
return setup_explicit_git_dir(gitdir, cwd, 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 const char *setup_nongit(const char *cwd, int *nongit_ok)
|
|
{
|
|
if (!nongit_ok)
|
|
die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
|
|
if (chdir(cwd))
|
|
die_errno(_("Cannot come back to cwd"));
|
|
*nongit_ok = 1;
|
|
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);
|
|
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
|
|
};
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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;
|
|
|
|
if (offset > min_offset)
|
|
strbuf_addch(dir, '/');
|
|
strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
|
|
gitdirenv = read_gitfile(dir->buf);
|
|
if (!gitdirenv && is_git_directory(dir->buf))
|
|
gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
|
|
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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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)) {
|
|
case GIT_DIR_NONE:
|
|
prefix = NULL;
|
|
break;
|
|
case GIT_DIR_EXPLICIT:
|
|
prefix = setup_explicit_git_dir(gitdir.buf, &cwd, 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,
|
|
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, nongit_ok);
|
|
break;
|
|
case GIT_DIR_HIT_CEILING:
|
|
prefix = setup_nongit(cwd.buf, nongit_ok);
|
|
break;
|
|
case GIT_DIR_HIT_MOUNT_POINT:
|
|
if (nongit_ok) {
|
|
*nongit_ok = 1;
|
|
strbuf_release(&cwd);
|
|
strbuf_release(&dir);
|
|
return NULL;
|
|
}
|
|
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);
|
|
default:
|
|
die("BUG: unhandled setup_git_directory_1() result");
|
|
}
|
|
|
|
if (prefix)
|
|
setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
|
|
else
|
|
setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
|
|
|
|
startup_info->have_repository = !nongit_ok || !*nongit_ok;
|
|
startup_info->prefix = prefix;
|
|
|
|
strbuf_release(&dir);
|
|
strbuf_release(&gitdir);
|
|
|
|
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)
|
|
{
|
|
check_repository_format_gently(get_git_dir(), NULL);
|
|
startup_info->have_repository = 1;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
}
|