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git/setup.c
Junio C Hamano a8bf3c0cac Merge branch 'kl/allow-working-in-dot-git-in-non-bare-repository' 
The "disable repository discovery of a bare repository" check,
triggered by setting safe.bareRepository configuration variable to
'explicit', has been loosened to exclude the ".git/" directory inside
a non-bare repository from the check.  So you can do "cd .git &&
git cmd" to run a Git command that works on a bare repository without
explicitly specifying $GIT_DIR now.

* kl/allow-working-in-dot-git-in-non-bare-repository:
  setup: allow cwd=.git w/ bareRepository=explicit
2024-01-30 13:34:12 -08:00

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#include "git-compat-util.h"
#include "abspath.h"
#include "copy.h"
#include "environment.h"
#include "exec-cmd.h"
#include "gettext.h"
#include "object-name.h"
#include "refs.h"
#include "repository.h"
#include "config.h"
#include "dir.h"
#include "setup.h"
#include "string-list.h"
#include "chdir-notify.h"
#include "path.h"
#include "quote.h"
#include "trace2.h"
#include "worktree.h"
static int inside_git_dir = -1;
static int inside_work_tree = -1;
static int work_tree_config_is_bogus;
enum allowed_bare_repo {
ALLOWED_BARE_REPO_EXPLICIT = 0,
ALLOWED_BARE_REPO_ALL,
};
static struct startup_info the_startup_info;
struct startup_info *startup_info = &the_startup_info;
const char *tmp_original_cwd;
/*
* 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();
struct strbuf realpath = STRBUF_INIT;
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';
strbuf_realpath(&realpath, path0, 1);
if (fspathcmp(realpath.buf, work_tree) == 0) {
memmove(path0, path + 1, len - (path - path0));
strbuf_release(&realpath);
return 0;
}
*path = '/';
}
}
/* check whole path */
strbuf_realpath(&realpath, path0, 1);
if (fspathcmp(realpath.buf, work_tree) == 0) {
*path0 = '\0';
strbuf_release(&realpath);
return 0;
}
strbuf_release(&realpath);
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) {
const char *hint_path = get_git_work_tree();
if (!hint_path)
hint_path = get_git_dir();
die(_("'%s' is outside repository at '%s'"), path,
absolute_path(hint_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)
{
const char *p;
int escaped = 0;
/*
* Wildcard characters imply the user is looking to match pathspecs
* that aren't in the filesystem. Note that this doesn't include
* backslash even though it's a glob special; by itself it doesn't
* cause any increase in the match. Likewise ignore backslash-escaped
* wildcard characters.
*/
for (p = arg; *p; p++) {
if (escaped) {
escaped = 0;
} else if (is_glob_special(*p)) {
if (*p == '\\')
escaped = 1;
else
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 void setup_original_cwd(void)
{
struct strbuf tmp = STRBUF_INIT;
const char *worktree = NULL;
int offset = -1;
if (!tmp_original_cwd)
return;
/*
* startup_info->original_cwd points to the current working
* directory we inherited from our parent process, which is a
* directory we want to avoid removing.
*
* For convience, we would like to have the path relative to the
* worktree instead of an absolute path.
*
* Yes, startup_info->original_cwd is usually the same as 'prefix',
* but differs in two ways:
* - prefix has a trailing '/'
* - if the user passes '-C' to git, that modifies the prefix but
* not startup_info->original_cwd.
*/
/* Normalize the directory */
if (!strbuf_realpath(&tmp, tmp_original_cwd, 0)) {
trace2_data_string("setup", the_repository,
"realpath-path", tmp_original_cwd);
trace2_data_string("setup", the_repository,
"realpath-failure", strerror(errno));
free((char*)tmp_original_cwd);
tmp_original_cwd = NULL;
return;
}
free((char*)tmp_original_cwd);
tmp_original_cwd = NULL;
startup_info->original_cwd = strbuf_detach(&tmp, NULL);
/*
* Get our worktree; we only protect the current working directory
* if it's in the worktree.
*/
worktree = get_git_work_tree();
if (!worktree)
goto no_prevention_needed;
offset = dir_inside_of(startup_info->original_cwd, worktree);
if (offset >= 0) {
/*
* If startup_info->original_cwd == worktree, that is already
* protected and we don't need original_cwd as a secondary
* protection measure.
*/
if (!*(startup_info->original_cwd + offset))
goto no_prevention_needed;
/*
* original_cwd was inside worktree; precompose it just as
* we do prefix so that built up paths will match
*/
startup_info->original_cwd = \
precompose_string_if_needed(startup_info->original_cwd
+ offset);
return;
}
no_prevention_needed:
free((char*)startup_info->original_cwd);
startup_info->original_cwd = NULL;
}
static int read_worktree_config(const char *var, const char *value,
const struct config_context *ctx UNUSED,
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;
}
enum extension_result {
EXTENSION_ERROR = -1, /* compatible with error(), etc */
EXTENSION_UNKNOWN = 0,
EXTENSION_OK = 1
};
/*
* Do not add new extensions to this function. It handles extensions which are
* respected even in v0-format repositories for historical compatibility.
*/
static enum extension_result handle_extension_v0(const char *var,
const char *value,
const char *ext,
struct repository_format *data)
{
if (!strcmp(ext, "noop")) {
return EXTENSION_OK;
} else if (!strcmp(ext, "preciousobjects")) {
data->precious_objects = git_config_bool(var, value);
return EXTENSION_OK;
} else if (!strcmp(ext, "partialclone")) {
if (!value)
return config_error_nonbool(var);
data->partial_clone = xstrdup(value);
return EXTENSION_OK;
} else if (!strcmp(ext, "worktreeconfig")) {
data->worktree_config = git_config_bool(var, value);
return EXTENSION_OK;
}
return EXTENSION_UNKNOWN;
}
/*
* Record any new extensions in this function.
*/
static enum extension_result handle_extension(const char *var,
const char *value,
const char *ext,
struct repository_format *data)
{
if (!strcmp(ext, "noop-v1")) {
return EXTENSION_OK;
} else if (!strcmp(ext, "objectformat")) {
int format;
if (!value)
return config_error_nonbool(var);
format = hash_algo_by_name(value);
if (format == GIT_HASH_UNKNOWN)
return error(_("invalid value for '%s': '%s'"),
"extensions.objectformat", value);
data->hash_algo = format;
return EXTENSION_OK;
} else if (!strcmp(ext, "refstorage")) {
unsigned int format;
if (!value)
return config_error_nonbool(var);
format = ref_storage_format_by_name(value);
if (format == REF_STORAGE_FORMAT_UNKNOWN)
return error(_("invalid value for '%s': '%s'"),
"extensions.refstorage", value);
data->ref_storage_format = format;
return EXTENSION_OK;
}
return EXTENSION_UNKNOWN;
}
static int check_repo_format(const char *var, const char *value,
const struct config_context *ctx, void *vdata)
{
struct repository_format *data = vdata;
const char *ext;
if (strcmp(var, "core.repositoryformatversion") == 0)
data->version = git_config_int(var, value, ctx->kvi);
else if (skip_prefix(var, "extensions.", &ext)) {
switch (handle_extension_v0(var, value, ext, data)) {
case EXTENSION_ERROR:
return -1;
case EXTENSION_OK:
return 0;
case EXTENSION_UNKNOWN:
break;
}
switch (handle_extension(var, value, ext, data)) {
case EXTENSION_ERROR:
return -1;
case EXTENSION_OK:
string_list_append(&data->v1_only_extensions, ext);
return 0;
case EXTENSION_UNKNOWN:
string_list_append(&data->unknown_extensions, ext);
return 0;
}
}
return read_worktree_config(var, value, ctx, 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;
string_list_clear(&candidate->unknown_extensions, 0);
string_list_clear(&candidate->v1_only_extensions, 0);
if (candidate->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;
}
int upgrade_repository_format(int target_version)
{
struct strbuf sb = STRBUF_INIT;
struct strbuf err = STRBUF_INIT;
struct strbuf repo_version = STRBUF_INIT;
struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
int ret;
strbuf_git_common_path(&sb, the_repository, "config");
read_repository_format(&repo_fmt, sb.buf);
strbuf_release(&sb);
if (repo_fmt.version >= target_version) {
ret = 0;
goto out;
}
if (verify_repository_format(&repo_fmt, &err) < 0) {
ret = error("cannot upgrade repository format from %d to %d: %s",
repo_fmt.version, target_version, err.buf);
goto out;
}
if (!repo_fmt.version && repo_fmt.unknown_extensions.nr) {
ret = error("cannot upgrade repository format: "
"unknown extension %s",
repo_fmt.unknown_extensions.items[0].string);
goto out;
}
strbuf_addf(&repo_version, "%d", target_version);
git_config_set("core.repositoryformatversion", repo_version.buf);
ret = 1;
out:
clear_repository_format(&repo_fmt);
strbuf_release(&repo_version);
strbuf_release(&err);
return ret;
}
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);
string_list_clear(&format->v1_only_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, Q_("unknown repository extension found:",
"unknown repository extensions found:",
format->unknown_extensions.nr));
for (i = 0; i < format->unknown_extensions.nr; i++)
strbuf_addf(err, "\n\t%s",
format->unknown_extensions.items[i].string);
return -1;
}
if (format->version == 0 && format->v1_only_extensions.nr) {
int i;
strbuf_addstr(err,
Q_("repo version is 0, but v1-only extension found:",
"repo version is 0, but v1-only extensions found:",
format->v1_only_extensions.nr));
for (i = 0; i < format->v1_only_extensions.nr; i++)
strbuf_addf(err, "\n\t%s",
format->v1_only_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;
static struct strbuf realpath = STRBUF_INIT;
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;
}
strbuf_realpath(&realpath, dir, 1);
path = realpath.buf;
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, 0);
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, 0);
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, 0);
free(gitfile);
return NULL;
}
offset = dir_inside_of(cwd->buf, worktree);
if (offset >= 0) { /* cwd inside worktree? */
set_git_dir(gitdirenv, 1);
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, 0);
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(gitdir, (offset != cwd->len));
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, 0);
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, 0);
}
else
set_git_dir(".", 0);
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_pathdup(), 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;
}
}
struct safe_directory_data {
const char *path;
int is_safe;
};
static int safe_directory_cb(const char *key, const char *value,
const struct config_context *ctx UNUSED, void *d)
{
struct safe_directory_data *data = d;
if (strcmp(key, "safe.directory"))
return 0;
if (!value || !*value) {
data->is_safe = 0;
} else if (!strcmp(value, "*")) {
data->is_safe = 1;
} else {
const char *interpolated = NULL;
if (!git_config_pathname(&interpolated, key, value) &&
!fspathcmp(data->path, interpolated ? interpolated : value))
data->is_safe = 1;
free((char *)interpolated);
}
return 0;
}
/*
* Check if a repository is safe, by verifying the ownership of the
* worktree (if any), the git directory, and the gitfile (if any).
*
* Exemptions for known-safe repositories can be added via `safe.directory`
* config settings; for non-bare repositories, their worktree needs to be
* added, for bare ones their git directory.
*/
static int ensure_valid_ownership(const char *gitfile,
const char *worktree, const char *gitdir,
struct strbuf *report)
{
struct safe_directory_data data = {
.path = worktree ? worktree : gitdir
};
if (!git_env_bool("GIT_TEST_ASSUME_DIFFERENT_OWNER", 0) &&
(!gitfile || is_path_owned_by_current_user(gitfile, report)) &&
(!worktree || is_path_owned_by_current_user(worktree, report)) &&
(!gitdir || is_path_owned_by_current_user(gitdir, report)))
return 1;
/*
* data.path is the "path" that identifies the repository and it is
* constant regardless of what failed above. data.is_safe should be
* initialized to false, and might be changed by the callback.
*/
git_protected_config(safe_directory_cb, &data);
return data.is_safe;
}
static int allowed_bare_repo_cb(const char *key, const char *value,
const struct config_context *ctx UNUSED,
void *d)
{
enum allowed_bare_repo *allowed_bare_repo = d;
if (strcasecmp(key, "safe.bareRepository"))
return 0;
if (!strcmp(value, "explicit")) {
*allowed_bare_repo = ALLOWED_BARE_REPO_EXPLICIT;
return 0;
}
if (!strcmp(value, "all")) {
*allowed_bare_repo = ALLOWED_BARE_REPO_ALL;
return 0;
}
return -1;
}
static enum allowed_bare_repo get_allowed_bare_repo(void)
{
enum allowed_bare_repo result = ALLOWED_BARE_REPO_ALL;
git_protected_config(allowed_bare_repo_cb, &result);
return result;
}
static const char *allowed_bare_repo_to_string(
enum allowed_bare_repo allowed_bare_repo)
{
switch (allowed_bare_repo) {
case ALLOWED_BARE_REPO_EXPLICIT:
return "explicit";
case ALLOWED_BARE_REPO_ALL:
return "all";
default:
BUG("invalid allowed_bare_repo %d",
allowed_bare_repo);
}
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.
*
* 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,
struct strbuf *report,
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 = offset_1st_component(dir->buf);
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;
if (min_offset && min_offset == dir->len &&
!is_dir_sep(dir->buf[min_offset - 1])) {
strbuf_addch(dir, '/');
min_offset++;
}
/*
* 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;
char *gitdir_path = NULL;
char *gitfile = NULL;
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;
gitdir_path = xstrdup(dir->buf);
}
} else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
return GIT_DIR_INVALID_GITFILE;
} else
gitfile = xstrdup(dir->buf);
/*
* Earlier, we tentatively added DEFAULT_GIT_DIR_ENVIRONMENT
* to check that directory for a repository.
* Now trim that tentative addition away, because we want to
* focus on the real directory we are in.
*/
strbuf_setlen(dir, offset);
if (gitdirenv) {
enum discovery_result ret;
const char *gitdir_candidate =
gitdir_path ? gitdir_path : gitdirenv;
if (ensure_valid_ownership(gitfile, dir->buf,
gitdir_candidate, report)) {
strbuf_addstr(gitdir, gitdirenv);
ret = GIT_DIR_DISCOVERED;
} else
ret = GIT_DIR_INVALID_OWNERSHIP;
/*
* Earlier, during discovery, we might have allocated
* string copies for gitdir_path or gitfile so make
* sure we don't leak by freeing them now, before
* leaving the loop and function.
*
* Note: gitdirenv will be non-NULL whenever these are
* allocated, therefore we need not take care of releasing
* them outside of this conditional block.
*/
free(gitdir_path);
free(gitfile);
return ret;
}
if (is_git_directory(dir->buf)) {
trace2_data_string("setup", NULL, "implicit-bare-repository", dir->buf);
if (get_allowed_bare_repo() == ALLOWED_BARE_REPO_EXPLICIT &&
!ends_with_path_components(dir->buf, ".git"))
return GIT_DIR_DISALLOWED_BARE;
if (!ensure_valid_ownership(NULL, NULL, dir->buf, report))
return GIT_DIR_INVALID_OWNERSHIP;
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;
}
}
enum discovery_result discover_git_directory_reason(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;
enum discovery_result result;
if (strbuf_getcwd(&dir))
return GIT_DIR_CWD_FAILURE;
cwd_len = dir.len;
result = setup_git_directory_gently_1(&dir, gitdir, NULL, 0);
if (result <= 0) {
strbuf_release(&dir);
return result;
}
/*
* 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 GIT_DIR_INVALID_FORMAT;
}
clear_repository_format(&candidate);
return result;
}
const char *setup_git_directory_gently(int *nongit_ok)
{
static struct strbuf cwd = STRBUF_INIT;
struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT, report = 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, &report, 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_INVALID_OWNERSHIP:
if (!nongit_ok) {
struct strbuf quoted = STRBUF_INIT;
strbuf_complete(&report, '\n');
sq_quote_buf_pretty(&quoted, dir.buf);
die(_("detected dubious ownership in repository at '%s'\n"
"%s"
"To add an exception for this directory, call:\n"
"\n"
"\tgit config --global --add safe.directory %s"),
dir.buf, report.buf, quoted.buf);
}
*nongit_ok = 1;
break;
case GIT_DIR_DISALLOWED_BARE:
if (!nongit_ok) {
die(_("cannot use bare repository '%s' (safe.bareRepository is '%s')"),
dir.buf,
allowed_bare_repo_to_string(get_allowed_bare_repo()));
}
*nongit_ok = 1;
break;
case GIT_DIR_CWD_FAILURE:
case GIT_DIR_INVALID_FORMAT:
/*
* As a safeguard against setup_git_directory_gently_1 returning
* these values, 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_gently_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;
else
startup_info->have_repository = 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);
repo_set_ref_storage_format(the_repository,
repo_fmt.ref_storage_format);
the_repository->repository_format_worktree_config =
repo_fmt.worktree_config;
/* take ownership of repo_fmt.partial_clone */
the_repository->repository_format_partial_clone =
repo_fmt.partial_clone;
repo_fmt.partial_clone = NULL;
}
}
/*
* Since precompose_string_if_needed() needs to look at
* the core.precomposeunicode configuration, this
* has to happen after the above block that finds
* out where the repository is, i.e. a preparation
* for calling git_config_get_bool().
*/
if (prefix) {
prefix = precompose_string_if_needed(prefix);
startup_info->prefix = prefix;
setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
} else {
startup_info->prefix = NULL;
setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
}
setup_original_cwd();
strbuf_release(&dir);
strbuf_release(&gitdir);
strbuf_release(&report);
clear_repository_format(&repo_fmt);
return prefix;
}
int git_config_perm(const char *var, const char *value)
{
int i;
char *endptr;
if (!value)
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(struct repository_format *fmt)
{
struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
if (!fmt)
fmt = &repo_fmt;
check_repository_format_gently(get_git_dir(), fmt, NULL);
startup_info->have_repository = 1;
repo_set_hash_algo(the_repository, fmt->hash_algo);
repo_set_ref_storage_format(the_repository,
fmt->ref_storage_format);
the_repository->repository_format_worktree_config =
fmt->worktree_config;
the_repository->repository_format_partial_clone =
xstrdup_or_null(fmt->partial_clone);
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 = xopen("/dev/null", O_RDWR);
while (fd < 2)
fd = xdup(fd);
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
}
#ifdef NO_TRUSTABLE_FILEMODE
#define TEST_FILEMODE 0
#else
#define TEST_FILEMODE 1
#endif
#define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH"
static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
DIR *dir)
{
size_t path_baselen = path->len;
size_t template_baselen = template_path->len;
struct dirent *de;
/* Note: if ".git/hooks" file exists in the repository being
* re-initialized, /etc/core-git/templates/hooks/update would
* cause "git init" to fail here. I think this is sane but
* it means that the set of templates we ship by default, along
* with the way the namespace under .git/ is organized, should
* be really carefully chosen.
*/
safe_create_dir(path->buf, 1);
while ((de = readdir(dir)) != NULL) {
struct stat st_git, st_template;
int exists = 0;
strbuf_setlen(path, path_baselen);
strbuf_setlen(template_path, template_baselen);
if (de->d_name[0] == '.')
continue;
strbuf_addstr(path, de->d_name);
strbuf_addstr(template_path, de->d_name);
if (lstat(path->buf, &st_git)) {
if (errno != ENOENT)
die_errno(_("cannot stat '%s'"), path->buf);
}
else
exists = 1;
if (lstat(template_path->buf, &st_template))
die_errno(_("cannot stat template '%s'"), template_path->buf);
if (S_ISDIR(st_template.st_mode)) {
DIR *subdir = opendir(template_path->buf);
if (!subdir)
die_errno(_("cannot opendir '%s'"), template_path->buf);
strbuf_addch(path, '/');
strbuf_addch(template_path, '/');
copy_templates_1(path, template_path, subdir);
closedir(subdir);
}
else if (exists)
continue;
else if (S_ISLNK(st_template.st_mode)) {
struct strbuf lnk = STRBUF_INIT;
if (strbuf_readlink(&lnk, template_path->buf,
st_template.st_size) < 0)
die_errno(_("cannot readlink '%s'"), template_path->buf);
if (symlink(lnk.buf, path->buf))
die_errno(_("cannot symlink '%s' '%s'"),
lnk.buf, path->buf);
strbuf_release(&lnk);
}
else if (S_ISREG(st_template.st_mode)) {
if (copy_file(path->buf, template_path->buf, st_template.st_mode))
die_errno(_("cannot copy '%s' to '%s'"),
template_path->buf, path->buf);
}
else
error(_("ignoring template %s"), template_path->buf);
}
}
static void copy_templates(const char *template_dir, const char *init_template_dir)
{
struct strbuf path = STRBUF_INIT;
struct strbuf template_path = STRBUF_INIT;
size_t template_len;
struct repository_format template_format = REPOSITORY_FORMAT_INIT;
struct strbuf err = STRBUF_INIT;
DIR *dir;
char *to_free = NULL;
if (!template_dir)
template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
if (!template_dir)
template_dir = init_template_dir;
if (!template_dir)
template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
if (!template_dir[0]) {
free(to_free);
return;
}
strbuf_addstr(&template_path, template_dir);
strbuf_complete(&template_path, '/');
template_len = template_path.len;
dir = opendir(template_path.buf);
if (!dir) {
warning(_("templates not found in %s"), template_dir);
goto free_return;
}
/* Make sure that template is from the correct vintage */
strbuf_addstr(&template_path, "config");
read_repository_format(&template_format, template_path.buf);
strbuf_setlen(&template_path, template_len);
/*
* No mention of version at all is OK, but anything else should be
* verified.
*/
if (template_format.version >= 0 &&
verify_repository_format(&template_format, &err) < 0) {
warning(_("not copying templates from '%s': %s"),
template_dir, err.buf);
strbuf_release(&err);
goto close_free_return;
}
strbuf_addstr(&path, get_git_common_dir());
strbuf_complete(&path, '/');
copy_templates_1(&path, &template_path, dir);
close_free_return:
closedir(dir);
free_return:
free(to_free);
strbuf_release(&path);
strbuf_release(&template_path);
clear_repository_format(&template_format);
}
/*
* If the git_dir is not directly inside the working tree, then git will not
* find it by default, and we need to set the worktree explicitly.
*/
static int needs_work_tree_config(const char *git_dir, const char *work_tree)
{
if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
return 0;
if (skip_prefix(git_dir, work_tree, &git_dir) &&
!strcmp(git_dir, "/.git"))
return 0;
return 1;
}
void initialize_repository_version(int hash_algo,
unsigned int ref_storage_format,
int reinit)
{
char repo_version_string[10];
int repo_version = GIT_REPO_VERSION;
if (hash_algo != GIT_HASH_SHA1 ||
ref_storage_format != REF_STORAGE_FORMAT_FILES)
repo_version = GIT_REPO_VERSION_READ;
/* This forces creation of new config file */
xsnprintf(repo_version_string, sizeof(repo_version_string),
"%d", repo_version);
git_config_set("core.repositoryformatversion", repo_version_string);
if (hash_algo != GIT_HASH_SHA1)
git_config_set("extensions.objectformat",
hash_algos[hash_algo].name);
else if (reinit)
git_config_set_gently("extensions.objectformat", NULL);
if (ref_storage_format != REF_STORAGE_FORMAT_FILES)
git_config_set("extensions.refstorage",
ref_storage_format_to_name(ref_storage_format));
}
static int is_reinit(void)
{
struct strbuf buf = STRBUF_INIT;
char junk[2];
int ret;
git_path_buf(&buf, "HEAD");
ret = !access(buf.buf, R_OK) || readlink(buf.buf, junk, sizeof(junk) - 1) != -1;
strbuf_release(&buf);
return ret;
}
void create_reference_database(unsigned int ref_storage_format,
const char *initial_branch, int quiet)
{
struct strbuf err = STRBUF_INIT;
int reinit = is_reinit();
repo_set_ref_storage_format(the_repository, ref_storage_format);
if (refs_init_db(get_main_ref_store(the_repository), 0, &err))
die("failed to set up refs db: %s", err.buf);
/*
* Point the HEAD symref to the initial branch with if HEAD does
* not yet exist.
*/
if (!reinit) {
char *ref;
if (!initial_branch)
initial_branch = git_default_branch_name(quiet);
ref = xstrfmt("refs/heads/%s", initial_branch);
if (check_refname_format(ref, 0) < 0)
die(_("invalid initial branch name: '%s'"),
initial_branch);
if (create_symref("HEAD", ref, NULL) < 0)
exit(1);
free(ref);
}
if (reinit && initial_branch)
warning(_("re-init: ignored --initial-branch=%s"),
initial_branch);
strbuf_release(&err);
}
static int create_default_files(const char *template_path,
const char *original_git_dir,
const struct repository_format *fmt,
int prev_bare_repository,
int init_shared_repository)
{
struct stat st1;
struct strbuf buf = STRBUF_INIT;
char *path;
int reinit;
int filemode;
const char *init_template_dir = NULL;
const char *work_tree = get_git_work_tree();
/*
* First copy the templates -- we might have the default
* config file there, in which case we would want to read
* from it after installing.
*
* Before reading that config, we also need to clear out any cached
* values (since we've just potentially changed what's available on
* disk).
*/
git_config_get_pathname("init.templatedir", &init_template_dir);
copy_templates(template_path, init_template_dir);
free((char *)init_template_dir);
git_config_clear();
reset_shared_repository();
git_config(git_default_config, NULL);
reinit = is_reinit();
/*
* We must make sure command-line options continue to override any
* values we might have just re-read from the config.
*/
if (init_shared_repository != -1)
set_shared_repository(init_shared_repository);
/*
* TODO: heed core.bare from config file in templates if no
* command-line override given
*/
is_bare_repository_cfg = prev_bare_repository || !work_tree;
/* TODO (continued):
*
* Unfortunately, the line above is equivalent to
* is_bare_repository_cfg = !work_tree;
* which ignores the config entirely even if no `--[no-]bare`
* command line option was present.
*
* To see why, note that before this function, there was this call:
* prev_bare_repository = is_bare_repository()
* expanding the right hand side:
* = is_bare_repository_cfg && !get_git_work_tree()
* = is_bare_repository_cfg && !work_tree
* note that the last simplification above is valid because nothing
* calls repo_init() or set_git_work_tree() between any of the
* relevant calls in the code, and thus the !get_git_work_tree()
* calls will return the same result each time. So, what we are
* interested in computing is the right hand side of the line of
* code just above this comment:
* prev_bare_repository || !work_tree
* = is_bare_repository_cfg && !work_tree || !work_tree
* = !work_tree
* because "A && !B || !B == !B" for all boolean values of A & B.
*/
/*
* We would have created the above under user's umask -- under
* shared-repository settings, we would need to fix them up.
*/
if (get_shared_repository()) {
adjust_shared_perm(get_git_dir());
}
initialize_repository_version(fmt->hash_algo, fmt->ref_storage_format, 0);
/* Check filemode trustability */
path = git_path_buf(&buf, "config");
filemode = TEST_FILEMODE;
if (TEST_FILEMODE && !lstat(path, &st1)) {
struct stat st2;
filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
!lstat(path, &st2) &&
st1.st_mode != st2.st_mode &&
!chmod(path, st1.st_mode));
if (filemode && !reinit && (st1.st_mode & S_IXUSR))
filemode = 0;
}
git_config_set("core.filemode", filemode ? "true" : "false");
if (is_bare_repository())
git_config_set("core.bare", "true");
else {
git_config_set("core.bare", "false");
/* allow template config file to override the default */
if (log_all_ref_updates == LOG_REFS_UNSET)
git_config_set("core.logallrefupdates", "true");
if (needs_work_tree_config(original_git_dir, work_tree))
git_config_set("core.worktree", work_tree);
}
if (!reinit) {
/* Check if symlink is supported in the work tree */
path = git_path_buf(&buf, "tXXXXXX");
if (!close(xmkstemp(path)) &&
!unlink(path) &&
!symlink("testing", path) &&
!lstat(path, &st1) &&
S_ISLNK(st1.st_mode))
unlink(path); /* good */
else
git_config_set("core.symlinks", "false");
/* Check if the filesystem is case-insensitive */
path = git_path_buf(&buf, "CoNfIg");
if (!access(path, F_OK))
git_config_set("core.ignorecase", "true");
probe_utf8_pathname_composition();
}
strbuf_release(&buf);
return reinit;
}
static void create_object_directory(void)
{
struct strbuf path = STRBUF_INIT;
size_t baselen;
strbuf_addstr(&path, get_object_directory());
baselen = path.len;
safe_create_dir(path.buf, 1);
strbuf_setlen(&path, baselen);
strbuf_addstr(&path, "/pack");
safe_create_dir(path.buf, 1);
strbuf_setlen(&path, baselen);
strbuf_addstr(&path, "/info");
safe_create_dir(path.buf, 1);
strbuf_release(&path);
}
static void separate_git_dir(const char *git_dir, const char *git_link)
{
struct stat st;
if (!stat(git_link, &st)) {
const char *src;
if (S_ISREG(st.st_mode))
src = read_gitfile(git_link);
else if (S_ISDIR(st.st_mode))
src = git_link;
else
die(_("unable to handle file type %d"), (int)st.st_mode);
if (rename(src, git_dir))
die_errno(_("unable to move %s to %s"), src, git_dir);
repair_worktrees(NULL, NULL);
}
write_file(git_link, "gitdir: %s", git_dir);
}
static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
{
const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
/*
* If we already have an initialized repo, don't allow the user to
* specify a different algorithm, as that could cause corruption.
* Otherwise, if the user has specified one on the command line, use it.
*/
if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
die(_("attempt to reinitialize repository with different hash"));
else if (hash != GIT_HASH_UNKNOWN)
repo_fmt->hash_algo = hash;
else if (env) {
int env_algo = hash_algo_by_name(env);
if (env_algo == GIT_HASH_UNKNOWN)
die(_("unknown hash algorithm '%s'"), env);
repo_fmt->hash_algo = env_algo;
}
}
static void validate_ref_storage_format(struct repository_format *repo_fmt,
unsigned int format)
{
const char *name = getenv("GIT_DEFAULT_REF_FORMAT");
if (repo_fmt->version >= 0 &&
format != REF_STORAGE_FORMAT_UNKNOWN &&
format != repo_fmt->ref_storage_format) {
die(_("attempt to reinitialize repository with different reference storage format"));
} else if (format != REF_STORAGE_FORMAT_UNKNOWN) {
repo_fmt->ref_storage_format = format;
} else if (name) {
format = ref_storage_format_by_name(name);
if (format == REF_STORAGE_FORMAT_UNKNOWN)
die(_("unknown ref storage format '%s'"), name);
repo_fmt->ref_storage_format = format;
}
}
int init_db(const char *git_dir, const char *real_git_dir,
const char *template_dir, int hash,
unsigned int ref_storage_format,
const char *initial_branch,
int init_shared_repository, unsigned int flags)
{
int reinit;
int exist_ok = flags & INIT_DB_EXIST_OK;
char *original_git_dir = real_pathdup(git_dir, 1);
struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
int prev_bare_repository;
if (real_git_dir) {
struct stat st;
if (!exist_ok && !stat(git_dir, &st))
die(_("%s already exists"), git_dir);
if (!exist_ok && !stat(real_git_dir, &st))
die(_("%s already exists"), real_git_dir);
set_git_dir(real_git_dir, 1);
git_dir = get_git_dir();
separate_git_dir(git_dir, original_git_dir);
}
else {
set_git_dir(git_dir, 1);
git_dir = get_git_dir();
}
startup_info->have_repository = 1;
/* Ensure `core.hidedotfiles` is processed */
git_config(platform_core_config, NULL);
safe_create_dir(git_dir, 0);
prev_bare_repository = is_bare_repository();
/* Check to see if the repository version is right.
* Note that a newly created repository does not have
* config file, so this will not fail. What we are catching
* is an attempt to reinitialize new repository with an old tool.
*/
check_repository_format(&repo_fmt);
validate_hash_algorithm(&repo_fmt, hash);
validate_ref_storage_format(&repo_fmt, ref_storage_format);
reinit = create_default_files(template_dir, original_git_dir,
&repo_fmt, prev_bare_repository,
init_shared_repository);
/*
* Now that we have set up both the hash algorithm and the ref storage
* format we can update the repository's settings accordingly.
*/
repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
repo_set_ref_storage_format(the_repository, repo_fmt.ref_storage_format);
if (!(flags & INIT_DB_SKIP_REFDB))
create_reference_database(repo_fmt.ref_storage_format,
initial_branch, flags & INIT_DB_QUIET);
create_object_directory();
if (get_shared_repository()) {
char buf[10];
/* We do not spell "group" and such, so that
* the configuration can be read by older version
* of git. Note, we use octal numbers for new share modes,
* and compatibility values for PERM_GROUP and
* PERM_EVERYBODY.
*/
if (get_shared_repository() < 0)
/* force to the mode value */
xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
else if (get_shared_repository() == PERM_GROUP)
xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
else if (get_shared_repository() == PERM_EVERYBODY)
xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
else
BUG("invalid value for shared_repository");
git_config_set("core.sharedrepository", buf);
git_config_set("receive.denyNonFastforwards", "true");
}
if (!(flags & INIT_DB_QUIET)) {
int len = strlen(git_dir);
if (reinit)
printf(get_shared_repository()
? _("Reinitialized existing shared Git repository in %s%s\n")
: _("Reinitialized existing Git repository in %s%s\n"),
git_dir, len && git_dir[len-1] != '/' ? "/" : "");
else
printf(get_shared_repository()
? _("Initialized empty shared Git repository in %s%s\n")
: _("Initialized empty Git repository in %s%s\n"),
git_dir, len && git_dir[len-1] != '/' ? "/" : "");
}
clear_repository_format(&repo_fmt);
free(original_git_dir);
return 0;
}
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