git/builtin/submodule--helper.c

#define USE_THE_INDEX_COMPATIBILITY_MACROS
#include "builtin.h"
#include "repository.h"
#include "cache.h"
#include "config.h"
#include "parse-options.h"
#include "quote.h"
#include "pathspec.h"
#include "dir.h"
#include "submodule.h"
#include "submodule-config.h"
#include "string-list.h"
#include "run-command.h"
#include "remote.h"
#include "refs.h"
#include "refspec.h"
#include "connect.h"
#include "revision.h"
#include "diffcore.h"
#include "diff.h"
#include "object-store.h"
#include "advice.h"
#include "branch.h"
#include "list-objects-filter-options.h"

#define OPT_QUIET (1 << 0)
#define OPT_CACHED (1 << 1)
#define OPT_RECURSIVE (1 << 2)
#define OPT_FORCE (1 << 3)

typedef void (*each_submodule_fn)(const struct cache_entry *list_item,
				  void *cb_data);

static char *repo_get_default_remote(struct repository *repo)
{
	char *dest = NULL, *ret;
	struct strbuf sb = STRBUF_INIT;
	struct ref_store *store = get_main_ref_store(repo);
	const char *refname = refs_resolve_ref_unsafe(store, "HEAD", 0, NULL,
						      NULL);

	if (!refname)
		die(_("No such ref: %s"), "HEAD");

	/* detached HEAD */
	if (!strcmp(refname, "HEAD"))
		return xstrdup("origin");

	if (!skip_prefix(refname, "refs/heads/", &refname))
		die(_("Expecting a full ref name, got %s"), refname);

	strbuf_addf(&sb, "branch.%s.remote", refname);
	if (repo_config_get_string(repo, sb.buf, &dest))
		ret = xstrdup("origin");
	else
		ret = dest;

	strbuf_release(&sb);
	return ret;
}

static char *get_default_remote_submodule(const char *module_path)
{
	struct repository subrepo;

	repo_submodule_init(&subrepo, the_repository, module_path, null_oid());
	return repo_get_default_remote(&subrepo);
}

static char *get_default_remote(void)
{
	return repo_get_default_remote(the_repository);
}

static int starts_with_dot_slash(const char *str)
{
	return str[0] == '.' && is_dir_sep(str[1]);
}

static int starts_with_dot_dot_slash(const char *str)
{
	return str[0] == '.' && str[1] == '.' && is_dir_sep(str[2]);
}

/*
 * Returns 1 if it was the last chop before ':'.
 */
static int chop_last_dir(char **remoteurl, int is_relative)
{
	char *rfind = find_last_dir_sep(*remoteurl);
	if (rfind) {
		*rfind = '\0';
		return 0;
	}

	rfind = strrchr(*remoteurl, ':');
	if (rfind) {
		*rfind = '\0';
		return 1;
	}

	if (is_relative || !strcmp(".", *remoteurl))
		die(_("cannot strip one component off url '%s'"),
			*remoteurl);

	free(*remoteurl);
	*remoteurl = xstrdup(".");
	return 0;
}

/*
 * The `url` argument is the URL that navigates to the submodule origin
 * repo. When relative, this URL is relative to the superproject origin
 * URL repo. The `up_path` argument, if specified, is the relative
 * path that navigates from the submodule working tree to the superproject
 * working tree. Returns the origin URL of the submodule.
 *
 * Return either an absolute URL or filesystem path (if the superproject
 * origin URL is an absolute URL or filesystem path, respectively) or a
 * relative file system path (if the superproject origin URL is a relative
 * file system path).
 *
 * When the output is a relative file system path, the path is either
 * relative to the submodule working tree, if up_path is specified, or to
 * the superproject working tree otherwise.
 *
 * NEEDSWORK: This works incorrectly on the domain and protocol part.
 * remote_url      url              outcome          expectation
 * http://a.com/b  ../c             http://a.com/c   as is
 * http://a.com/b/ ../c             http://a.com/c   same as previous line, but
 *                                                   ignore trailing slash in url
 * http://a.com/b  ../../c          http://c         error out
 * http://a.com/b  ../../../c       http:/c          error out
 * http://a.com/b  ../../../../c    http:c           error out
 * http://a.com/b  ../../../../../c    .:c           error out
 * NEEDSWORK: Given how chop_last_dir() works, this function is broken
 * when a local part has a colon in its path component, too.
 */
static char *relative_url(const char *remote_url,
				const char *url,
				const char *up_path)
{
	int is_relative = 0;
	int colonsep = 0;
	char *out;
	char *remoteurl = xstrdup(remote_url);
	struct strbuf sb = STRBUF_INIT;
	size_t len = strlen(remoteurl);

	if (is_dir_sep(remoteurl[len-1]))
		remoteurl[len-1] = '\0';

	if (!url_is_local_not_ssh(remoteurl) || is_absolute_path(remoteurl))
		is_relative = 0;
	else {
		is_relative = 1;
		/*
		 * Prepend a './' to ensure all relative
		 * remoteurls start with './' or '../'
		 */
		if (!starts_with_dot_slash(remoteurl) &&
		    !starts_with_dot_dot_slash(remoteurl)) {
			strbuf_reset(&sb);
			strbuf_addf(&sb, "./%s", remoteurl);
			free(remoteurl);
			remoteurl = strbuf_detach(&sb, NULL);
		}
	}
	/*
	 * When the url starts with '../', remove that and the
	 * last directory in remoteurl.
	 */
	while (url) {
		if (starts_with_dot_dot_slash(url)) {
			url += 3;
			colonsep |= chop_last_dir(&remoteurl, is_relative);
		} else if (starts_with_dot_slash(url))
			url += 2;
		else
			break;
	}
	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
	if (ends_with(url, "/"))
		strbuf_setlen(&sb, sb.len - 1);
	free(remoteurl);

	if (starts_with_dot_slash(sb.buf))
		out = xstrdup(sb.buf + 2);
	else
		out = xstrdup(sb.buf);

	if (!up_path || !is_relative) {
		strbuf_release(&sb);
		return out;
	}

	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s%s", up_path, out);
	free(out);
	return strbuf_detach(&sb, NULL);
}

static char *resolve_relative_url(const char *rel_url, const char *up_path, int quiet)
{
	char *remoteurl, *resolved_url;
	char *remote = get_default_remote();
	struct strbuf remotesb = STRBUF_INIT;

	strbuf_addf(&remotesb, "remote.%s.url", remote);
	if (git_config_get_string(remotesb.buf, &remoteurl)) {
		if (!quiet)
			warning(_("could not look up configuration '%s'. "
				  "Assuming this repository is its own "
				  "authoritative upstream."),
				remotesb.buf);
		remoteurl = xgetcwd();
	}
	resolved_url = relative_url(remoteurl, rel_url, up_path);

	free(remote);
	free(remoteurl);
	strbuf_release(&remotesb);

	return resolved_url;
}

static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
{
	char *remoteurl, *res;
	const char *up_path, *url;

	if (argc != 4)
		die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");

	up_path = argv[1];
	remoteurl = xstrdup(argv[2]);
	url = argv[3];

	if (!strcmp(up_path, "(null)"))
		up_path = NULL;

	res = relative_url(remoteurl, url, up_path);
	puts(res);
	free(res);
	free(remoteurl);
	return 0;
}

static char *do_get_submodule_displaypath(const char *path,
					  const char *prefix,
					  const char *super_prefix)
{
	if (prefix && super_prefix) {
		BUG("cannot have prefix '%s' and superprefix '%s'",
		    prefix, super_prefix);
	} else if (prefix) {
		struct strbuf sb = STRBUF_INIT;
		char *displaypath = xstrdup(relative_path(path, prefix, &sb));
		strbuf_release(&sb);
		return displaypath;
	} else if (super_prefix) {
		return xstrfmt("%s%s", super_prefix, path);
	} else {
		return xstrdup(path);
	}
}

/* the result should be freed by the caller. */
static char *get_submodule_displaypath(const char *path, const char *prefix)
{
	const char *super_prefix = get_super_prefix();
	return do_get_submodule_displaypath(path, prefix, super_prefix);
}

static char *compute_rev_name(const char *sub_path, const char* object_id)
{
	struct strbuf sb = STRBUF_INIT;
	const char ***d;

	static const char *describe_bare[] = { NULL };

	static const char *describe_tags[] = { "--tags", NULL };

	static const char *describe_contains[] = { "--contains", NULL };

	static const char *describe_all_always[] = { "--all", "--always", NULL };

	static const char **describe_argv[] = { describe_bare, describe_tags,
						describe_contains,
						describe_all_always, NULL };

	for (d = describe_argv; *d; d++) {
		struct child_process cp = CHILD_PROCESS_INIT;
		prepare_submodule_repo_env(&cp.env_array);
		cp.dir = sub_path;
		cp.git_cmd = 1;
		cp.no_stderr = 1;

		strvec_push(&cp.args, "describe");
		strvec_pushv(&cp.args, *d);
		strvec_push(&cp.args, object_id);

		if (!capture_command(&cp, &sb, 0)) {
			strbuf_strip_suffix(&sb, "\n");
			return strbuf_detach(&sb, NULL);
		}
	}

	strbuf_release(&sb);
	return NULL;
}

struct module_list {
	const struct cache_entry **entries;
	int alloc, nr;
};
#define MODULE_LIST_INIT { 0 }

static int module_list_compute(int argc, const char **argv,
			       const char *prefix,
			       struct pathspec *pathspec,
			       struct module_list *list)
{
	int i, result = 0;
	char *ps_matched = NULL;
	parse_pathspec(pathspec, 0,
		       PATHSPEC_PREFER_FULL,
		       prefix, argv);

	if (pathspec->nr)
		ps_matched = xcalloc(pathspec->nr, 1);

	if (read_cache() < 0)
		die(_("index file corrupt"));

	for (i = 0; i < active_nr; i++) {
		const struct cache_entry *ce = active_cache[i];

		if (!match_pathspec(&the_index, pathspec, ce->name, ce_namelen(ce),
				    0, ps_matched, 1) ||
		    !S_ISGITLINK(ce->ce_mode))
			continue;

		ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
		list->entries[list->nr++] = ce;
		while (i + 1 < active_nr &&
		       !strcmp(ce->name, active_cache[i + 1]->name))
			/*
			 * Skip entries with the same name in different stages
			 * to make sure an entry is returned only once.
			 */
			i++;
	}

	if (ps_matched && report_path_error(ps_matched, pathspec))
		result = -1;

	free(ps_matched);

	return result;
}

static void module_list_active(struct module_list *list)
{
	int i;
	struct module_list active_modules = MODULE_LIST_INIT;

	for (i = 0; i < list->nr; i++) {
		const struct cache_entry *ce = list->entries[i];

		if (!is_submodule_active(the_repository, ce->name))
			continue;

		ALLOC_GROW(active_modules.entries,
			   active_modules.nr + 1,
			   active_modules.alloc);
		active_modules.entries[active_modules.nr++] = ce;
	}

	free(list->entries);
	*list = active_modules;
}

static char *get_up_path(const char *path)
{
	int i;
	struct strbuf sb = STRBUF_INIT;

	for (i = count_slashes(path); i; i--)
		strbuf_addstr(&sb, "../");

	/*
	 * Check if 'path' ends with slash or not
	 * for having the same output for dir/sub_dir
	 * and dir/sub_dir/
	 */
	if (!is_dir_sep(path[strlen(path) - 1]))
		strbuf_addstr(&sb, "../");

	return strbuf_detach(&sb, NULL);
}

static int module_list(int argc, const char **argv, const char *prefix)
{
	int i;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;

	struct option module_list_options[] = {
		OPT_STRING(0, "prefix", &prefix,
			   N_("path"),
			   N_("alternative anchor for relative paths")),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_list_options,
			     git_submodule_helper_usage, 0);

	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;

	for (i = 0; i < list.nr; i++) {
		const struct cache_entry *ce = list.entries[i];

		if (ce_stage(ce))
			printf("%06o %s U\t", ce->ce_mode,
			       oid_to_hex(null_oid()));
		else
			printf("%06o %s %d\t", ce->ce_mode,
			       oid_to_hex(&ce->oid), ce_stage(ce));

		fprintf(stdout, "%s\n", ce->name);
	}
	return 0;
}

static void for_each_listed_submodule(const struct module_list *list,
				      each_submodule_fn fn, void *cb_data)
{
	int i;
	for (i = 0; i < list->nr; i++)
		fn(list->entries[i], cb_data);
}

struct foreach_cb {
	int argc;
	const char **argv;
	const char *prefix;
	int quiet;
	int recursive;
};
#define FOREACH_CB_INIT { 0 }

static void runcommand_in_submodule_cb(const struct cache_entry *list_item,
				       void *cb_data)
{
	struct foreach_cb *info = cb_data;
	const char *path = list_item->name;
	const struct object_id *ce_oid = &list_item->oid;

	const struct submodule *sub;
	struct child_process cp = CHILD_PROCESS_INIT;
	char *displaypath;

	displaypath = get_submodule_displaypath(path, info->prefix);

	sub = submodule_from_path(the_repository, null_oid(), path);

	if (!sub)
		die(_("No url found for submodule path '%s' in .gitmodules"),
			displaypath);

	if (!is_submodule_populated_gently(path, NULL))
		goto cleanup;

	prepare_submodule_repo_env(&cp.env_array);

	/*
	 * For the purpose of executing <command> in the submodule,
	 * separate shell is used for the purpose of running the
	 * child process.
	 */
	cp.use_shell = 1;
	cp.dir = path;

	/*
	 * NEEDSWORK: the command currently has access to the variables $name,
	 * $sm_path, $displaypath, $sha1 and $toplevel only when the command
	 * contains a single argument. This is done for maintaining a faithful
	 * translation from shell script.
	 */
	if (info->argc == 1) {
		char *toplevel = xgetcwd();
		struct strbuf sb = STRBUF_INIT;

		strvec_pushf(&cp.env_array, "name=%s", sub->name);
		strvec_pushf(&cp.env_array, "sm_path=%s", path);
		strvec_pushf(&cp.env_array, "displaypath=%s", displaypath);
		strvec_pushf(&cp.env_array, "sha1=%s",
			     oid_to_hex(ce_oid));
		strvec_pushf(&cp.env_array, "toplevel=%s", toplevel);

		/*
		 * Since the path variable was accessible from the script
		 * before porting, it is also made available after porting.
		 * The environment variable "PATH" has a very special purpose
		 * on windows. And since environment variables are
		 * case-insensitive in windows, it interferes with the
		 * existing PATH variable. Hence, to avoid that, we expose
		 * path via the args strvec and not via env_array.
		 */
		sq_quote_buf(&sb, path);
		strvec_pushf(&cp.args, "path=%s; %s",
			     sb.buf, info->argv[0]);
		strbuf_release(&sb);
		free(toplevel);
	} else {
		strvec_pushv(&cp.args, info->argv);
	}

	if (!info->quiet)
		printf(_("Entering '%s'\n"), displaypath);

	if (info->argv[0] && run_command(&cp))
		die(_("run_command returned non-zero status for %s\n."),
			displaypath);

	if (info->recursive) {
		struct child_process cpr = CHILD_PROCESS_INIT;

		cpr.git_cmd = 1;
		cpr.dir = path;
		prepare_submodule_repo_env(&cpr.env_array);

		strvec_pushl(&cpr.args, "--super-prefix", NULL);
		strvec_pushf(&cpr.args, "%s/", displaypath);
		strvec_pushl(&cpr.args, "submodule--helper", "foreach", "--recursive",
			     NULL);

		if (info->quiet)
			strvec_push(&cpr.args, "--quiet");

		strvec_push(&cpr.args, "--");
		strvec_pushv(&cpr.args, info->argv);

		if (run_command(&cpr))
			die(_("run_command returned non-zero status while "
				"recursing in the nested submodules of %s\n."),
				displaypath);
	}

cleanup:
	free(displaypath);
}

static int module_foreach(int argc, const char **argv, const char *prefix)
{
	struct foreach_cb info = FOREACH_CB_INIT;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;

	struct option module_foreach_options[] = {
		OPT__QUIET(&info.quiet, N_("suppress output of entering each submodule command")),
		OPT_BOOL(0, "recursive", &info.recursive,
			 N_("recurse into nested submodules")),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper foreach [--quiet] [--recursive] [--] <command>"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_foreach_options,
			     git_submodule_helper_usage, 0);

	if (module_list_compute(0, NULL, prefix, &pathspec, &list) < 0)
		return 1;

	info.argc = argc;
	info.argv = argv;
	info.prefix = prefix;

	for_each_listed_submodule(&list, runcommand_in_submodule_cb, &info);

	return 0;
}

struct init_cb {
	const char *prefix;
	const char *superprefix;
	unsigned int flags;
};
#define INIT_CB_INIT { 0 }

static void init_submodule(const char *path, const char *prefix,
			   const char *superprefix, unsigned int flags)
{
	const struct submodule *sub;
	struct strbuf sb = STRBUF_INIT;
	char *upd = NULL, *url = NULL, *displaypath;

	/* try superprefix from the environment, if it is not passed explicitly */
	if (!superprefix)
		superprefix = get_super_prefix();
	displaypath = do_get_submodule_displaypath(path, prefix, superprefix);

	sub = submodule_from_path(the_repository, null_oid(), path);

	if (!sub)
		die(_("No url found for submodule path '%s' in .gitmodules"),
			displaypath);

	/*
	 * NEEDSWORK: In a multi-working-tree world, this needs to be
	 * set in the per-worktree config.
	 *
	 * Set active flag for the submodule being initialized
	 */
	if (!is_submodule_active(the_repository, path)) {
		strbuf_addf(&sb, "submodule.%s.active", sub->name);
		git_config_set_gently(sb.buf, "true");
		strbuf_reset(&sb);
	}

	/*
	 * Copy url setting when it is not set yet.
	 * To look up the url in .git/config, we must not fall back to
	 * .gitmodules, so look it up directly.
	 */
	strbuf_addf(&sb, "submodule.%s.url", sub->name);
	if (git_config_get_string(sb.buf, &url)) {
		if (!sub->url)
			die(_("No url found for submodule path '%s' in .gitmodules"),
				displaypath);

		url = xstrdup(sub->url);

		/* Possibly a url relative to parent */
		if (starts_with_dot_dot_slash(url) ||
		    starts_with_dot_slash(url)) {
			char *oldurl = url;
			url = resolve_relative_url(oldurl, NULL, 0);
			free(oldurl);
		}

		if (git_config_set_gently(sb.buf, url))
			die(_("Failed to register url for submodule path '%s'"),
			    displaypath);
		if (!(flags & OPT_QUIET))
			fprintf(stderr,
				_("Submodule '%s' (%s) registered for path '%s'\n"),
				sub->name, url, displaypath);
	}
	strbuf_reset(&sb);

	/* Copy "update" setting when it is not set yet */
	strbuf_addf(&sb, "submodule.%s.update", sub->name);
	if (git_config_get_string(sb.buf, &upd) &&
	    sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
		if (sub->update_strategy.type == SM_UPDATE_COMMAND) {
			fprintf(stderr, _("warning: command update mode suggested for submodule '%s'\n"),
				sub->name);
			upd = xstrdup("none");
		} else
			upd = xstrdup(submodule_strategy_to_string(&sub->update_strategy));

		if (git_config_set_gently(sb.buf, upd))
			die(_("Failed to register update mode for submodule path '%s'"), displaypath);
	}
	strbuf_release(&sb);
	free(displaypath);
	free(url);
	free(upd);
}

static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
{
	struct init_cb *info = cb_data;
	init_submodule(list_item->name, info->prefix, info->superprefix, info->flags);
}

static int module_init(int argc, const char **argv, const char *prefix)
{
	struct init_cb info = INIT_CB_INIT;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;
	int quiet = 0;

	struct option module_init_options[] = {
		OPT__QUIET(&quiet, N_("suppress output for initializing a submodule")),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper init [<options>] [<path>]"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_init_options,
			     git_submodule_helper_usage, 0);

	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;

	/*
	 * If there are no path args and submodule.active is set then,
	 * by default, only initialize 'active' modules.
	 */
	if (!argc && git_config_get_value_multi("submodule.active"))
		module_list_active(&list);

	info.prefix = prefix;
	if (quiet)
		info.flags |= OPT_QUIET;

	for_each_listed_submodule(&list, init_submodule_cb, &info);

	return 0;
}

struct status_cb {
	const char *prefix;
	unsigned int flags;
};
#define STATUS_CB_INIT { 0 }

static void print_status(unsigned int flags, char state, const char *path,
			 const struct object_id *oid, const char *displaypath)
{
	if (flags & OPT_QUIET)
		return;

	printf("%c%s %s", state, oid_to_hex(oid), displaypath);

	if (state == ' ' || state == '+') {
		const char *name = compute_rev_name(path, oid_to_hex(oid));

		if (name)
			printf(" (%s)", name);
	}

	printf("\n");
}

static int handle_submodule_head_ref(const char *refname,
				     const struct object_id *oid, int flags,
				     void *cb_data)
{
	struct object_id *output = cb_data;
	if (oid)
		oidcpy(output, oid);

	return 0;
}

static void status_submodule(const char *path, const struct object_id *ce_oid,
			     unsigned int ce_flags, const char *prefix,
			     unsigned int flags)
{
	char *displaypath;
	struct strvec diff_files_args = STRVEC_INIT;
	struct rev_info rev;
	int diff_files_result;
	struct strbuf buf = STRBUF_INIT;
	const char *git_dir;

	if (!submodule_from_path(the_repository, null_oid(), path))
		die(_("no submodule mapping found in .gitmodules for path '%s'"),
		      path);

	displaypath = get_submodule_displaypath(path, prefix);

	if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
		print_status(flags, 'U', path, null_oid(), displaypath);
		goto cleanup;
	}

	strbuf_addf(&buf, "%s/.git", path);
	git_dir = read_gitfile(buf.buf);
	if (!git_dir)
		git_dir = buf.buf;

	if (!is_submodule_active(the_repository, path) ||
	    !is_git_directory(git_dir)) {
		print_status(flags, '-', path, ce_oid, displaypath);
		strbuf_release(&buf);
		goto cleanup;
	}
	strbuf_release(&buf);

	strvec_pushl(&diff_files_args, "diff-files",
		     "--ignore-submodules=dirty", "--quiet", "--",
		     path, NULL);

	git_config(git_diff_basic_config, NULL);

	repo_init_revisions(the_repository, &rev, NULL);
	rev.abbrev = 0;
	diff_files_args.nr = setup_revisions(diff_files_args.nr,
					     diff_files_args.v,
					     &rev, NULL);
	diff_files_result = run_diff_files(&rev, 0);

	if (!diff_result_code(&rev.diffopt, diff_files_result)) {
		print_status(flags, ' ', path, ce_oid,
			     displaypath);
	} else if (!(flags & OPT_CACHED)) {
		struct object_id oid;
		struct ref_store *refs = get_submodule_ref_store(path);

		if (!refs) {
			print_status(flags, '-', path, ce_oid, displaypath);
			goto cleanup;
		}
		if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
			die(_("could not resolve HEAD ref inside the "
			      "submodule '%s'"), path);

		print_status(flags, '+', path, &oid, displaypath);
	} else {
		print_status(flags, '+', path, ce_oid, displaypath);
	}

	if (flags & OPT_RECURSIVE) {
		struct child_process cpr = CHILD_PROCESS_INIT;

		cpr.git_cmd = 1;
		cpr.dir = path;
		prepare_submodule_repo_env(&cpr.env_array);

		strvec_push(&cpr.args, "--super-prefix");
		strvec_pushf(&cpr.args, "%s/", displaypath);
		strvec_pushl(&cpr.args, "submodule--helper", "status",
			     "--recursive", NULL);

		if (flags & OPT_CACHED)
			strvec_push(&cpr.args, "--cached");

		if (flags & OPT_QUIET)
			strvec_push(&cpr.args, "--quiet");

		if (run_command(&cpr))
			die(_("failed to recurse into submodule '%s'"), path);
	}

cleanup:
	strvec_clear(&diff_files_args);
	free(displaypath);
}

static void status_submodule_cb(const struct cache_entry *list_item,
				void *cb_data)
{
	struct status_cb *info = cb_data;
	status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
			 info->prefix, info->flags);
}

static int module_status(int argc, const char **argv, const char *prefix)
{
	struct status_cb info = STATUS_CB_INIT;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;
	int quiet = 0;

	struct option module_status_options[] = {
		OPT__QUIET(&quiet, N_("suppress submodule status output")),
		OPT_BIT(0, "cached", &info.flags, N_("use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
		OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_status_options,
			     git_submodule_helper_usage, 0);

	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;

	info.prefix = prefix;
	if (quiet)
		info.flags |= OPT_QUIET;

	for_each_listed_submodule(&list, status_submodule_cb, &info);

	return 0;
}

static int module_name(int argc, const char **argv, const char *prefix)
{
	const struct submodule *sub;

	if (argc != 2)
		usage(_("git submodule--helper name <path>"));

	sub = submodule_from_path(the_repository, null_oid(), argv[1]);

	if (!sub)
		die(_("no submodule mapping found in .gitmodules for path '%s'"),
		    argv[1]);

	printf("%s\n", sub->name);

	return 0;
}

struct module_cb {
	unsigned int mod_src;
	unsigned int mod_dst;
	struct object_id oid_src;
	struct object_id oid_dst;
	char status;
	const char *sm_path;
};
#define MODULE_CB_INIT { 0 }

struct module_cb_list {
	struct module_cb **entries;
	int alloc, nr;
};
#define MODULE_CB_LIST_INIT { 0 }

struct summary_cb {
	int argc;
	const char **argv;
	const char *prefix;
	unsigned int cached: 1;
	unsigned int for_status: 1;
	unsigned int files: 1;
	int summary_limit;
};
#define SUMMARY_CB_INIT { 0 }

enum diff_cmd {
	DIFF_INDEX,
	DIFF_FILES
};

static char *verify_submodule_committish(const char *sm_path,
					 const char *committish)
{
	struct child_process cp_rev_parse = CHILD_PROCESS_INIT;
	struct strbuf result = STRBUF_INIT;

	cp_rev_parse.git_cmd = 1;
	cp_rev_parse.dir = sm_path;
	prepare_submodule_repo_env(&cp_rev_parse.env_array);
	strvec_pushl(&cp_rev_parse.args, "rev-parse", "-q", "--short", NULL);
	strvec_pushf(&cp_rev_parse.args, "%s^0", committish);
	strvec_push(&cp_rev_parse.args, "--");

	if (capture_command(&cp_rev_parse, &result, 0))
		return NULL;

	strbuf_trim_trailing_newline(&result);
	return strbuf_detach(&result, NULL);
}

static void print_submodule_summary(struct summary_cb *info, char *errmsg,
				    int total_commits, const char *displaypath,
				    const char *src_abbrev, const char *dst_abbrev,
				    struct module_cb *p)
{
	if (p->status == 'T') {
		if (S_ISGITLINK(p->mod_dst))
			printf(_("* %s %s(blob)->%s(submodule)"),
				 displaypath, src_abbrev, dst_abbrev);
		else
			printf(_("* %s %s(submodule)->%s(blob)"),
				 displaypath, src_abbrev, dst_abbrev);
	} else {
		printf("* %s %s...%s",
			displaypath, src_abbrev, dst_abbrev);
	}

	if (total_commits < 0)
		printf(":\n");
	else
		printf(" (%d):\n", total_commits);

	if (errmsg) {
		printf(_("%s"), errmsg);
	} else if (total_commits > 0) {
		struct child_process cp_log = CHILD_PROCESS_INIT;

		cp_log.git_cmd = 1;
		cp_log.dir = p->sm_path;
		prepare_submodule_repo_env(&cp_log.env_array);
		strvec_pushl(&cp_log.args, "log", NULL);

		if (S_ISGITLINK(p->mod_src) && S_ISGITLINK(p->mod_dst)) {
			if (info->summary_limit > 0)
				strvec_pushf(&cp_log.args, "-%d",
					     info->summary_limit);

			strvec_pushl(&cp_log.args, "--pretty=  %m %s",
				     "--first-parent", NULL);
			strvec_pushf(&cp_log.args, "%s...%s",
				     src_abbrev, dst_abbrev);
		} else if (S_ISGITLINK(p->mod_dst)) {
			strvec_pushl(&cp_log.args, "--pretty=  > %s",
				     "-1", dst_abbrev, NULL);
		} else {
			strvec_pushl(&cp_log.args, "--pretty=  < %s",
				     "-1", src_abbrev, NULL);
		}
		run_command(&cp_log);
	}
	printf("\n");
}

static void generate_submodule_summary(struct summary_cb *info,
				       struct module_cb *p)
{
	char *displaypath, *src_abbrev = NULL, *dst_abbrev;
	int missing_src = 0, missing_dst = 0;
	char *errmsg = NULL;
	int total_commits = -1;

	if (!info->cached && oideq(&p->oid_dst, null_oid())) {
		if (S_ISGITLINK(p->mod_dst)) {
			struct ref_store *refs = get_submodule_ref_store(p->sm_path);
			if (refs)
				refs_head_ref(refs, handle_submodule_head_ref, &p->oid_dst);
		} else if (S_ISLNK(p->mod_dst) || S_ISREG(p->mod_dst)) {
			struct stat st;
			int fd = open(p->sm_path, O_RDONLY);

			if (fd < 0 || fstat(fd, &st) < 0 ||
			    index_fd(&the_index, &p->oid_dst, fd, &st, OBJ_BLOB,
				     p->sm_path, 0))
				error(_("couldn't hash object from '%s'"), p->sm_path);
		} else {
			/* for a submodule removal (mode:0000000), don't warn */
			if (p->mod_dst)
				warning(_("unexpected mode %o\n"), p->mod_dst);
		}
	}

	if (S_ISGITLINK(p->mod_src)) {
		if (p->status != 'D')
			src_abbrev = verify_submodule_committish(p->sm_path,
								 oid_to_hex(&p->oid_src));
		if (!src_abbrev) {
			missing_src = 1;
			/*
			 * As `rev-parse` failed, we fallback to getting
			 * the abbreviated hash using oid_src. We do
			 * this as we might still need the abbreviated
			 * hash in cases like a submodule type change, etc.
			 */
			src_abbrev = xstrndup(oid_to_hex(&p->oid_src), 7);
		}
	} else {
		/*
		 * The source does not point to a submodule.
		 * So, we fallback to getting the abbreviation using
		 * oid_src as we might still need the abbreviated
		 * hash in cases like submodule add, etc.
		 */
		src_abbrev = xstrndup(oid_to_hex(&p->oid_src), 7);
	}

	if (S_ISGITLINK(p->mod_dst)) {
		dst_abbrev = verify_submodule_committish(p->sm_path,
							 oid_to_hex(&p->oid_dst));
		if (!dst_abbrev) {
			missing_dst = 1;
			/*
			 * As `rev-parse` failed, we fallback to getting
			 * the abbreviated hash using oid_dst. We do
			 * this as we might still need the abbreviated
			 * hash in cases like a submodule type change, etc.
			 */
			dst_abbrev = xstrndup(oid_to_hex(&p->oid_dst), 7);
		}
	} else {
		/*
		 * The destination does not point to a submodule.
		 * So, we fallback to getting the abbreviation using
		 * oid_dst as we might still need the abbreviated
		 * hash in cases like a submodule removal, etc.
		 */
		dst_abbrev = xstrndup(oid_to_hex(&p->oid_dst), 7);
	}

	displaypath = get_submodule_displaypath(p->sm_path, info->prefix);

	if (!missing_src && !missing_dst) {
		struct child_process cp_rev_list = CHILD_PROCESS_INIT;
		struct strbuf sb_rev_list = STRBUF_INIT;

		strvec_pushl(&cp_rev_list.args, "rev-list",
			     "--first-parent", "--count", NULL);
		if (S_ISGITLINK(p->mod_src) && S_ISGITLINK(p->mod_dst))
			strvec_pushf(&cp_rev_list.args, "%s...%s",
				     src_abbrev, dst_abbrev);
		else
			strvec_push(&cp_rev_list.args, S_ISGITLINK(p->mod_src) ?
				    src_abbrev : dst_abbrev);
		strvec_push(&cp_rev_list.args, "--");

		cp_rev_list.git_cmd = 1;
		cp_rev_list.dir = p->sm_path;
		prepare_submodule_repo_env(&cp_rev_list.env_array);

		if (!capture_command(&cp_rev_list, &sb_rev_list, 0))
			total_commits = atoi(sb_rev_list.buf);

		strbuf_release(&sb_rev_list);
	} else {
		/*
		 * Don't give error msg for modification whose dst is not
		 * submodule, i.e., deleted or changed to blob
		 */
		if (S_ISGITLINK(p->mod_dst)) {
			struct strbuf errmsg_str = STRBUF_INIT;
			if (missing_src && missing_dst) {
				strbuf_addf(&errmsg_str, "  Warn: %s doesn't contain commits %s and %s\n",
					    displaypath, oid_to_hex(&p->oid_src),
					    oid_to_hex(&p->oid_dst));
			} else {
				strbuf_addf(&errmsg_str, "  Warn: %s doesn't contain commit %s\n",
					    displaypath, missing_src ?
					    oid_to_hex(&p->oid_src) :
					    oid_to_hex(&p->oid_dst));
			}
			errmsg = strbuf_detach(&errmsg_str, NULL);
		}
	}

	print_submodule_summary(info, errmsg, total_commits,
				displaypath, src_abbrev,
				dst_abbrev, p);

	free(displaypath);
	free(src_abbrev);
	free(dst_abbrev);
}

static void prepare_submodule_summary(struct summary_cb *info,
				      struct module_cb_list *list)
{
	int i;
	for (i = 0; i < list->nr; i++) {
		const struct submodule *sub;
		struct module_cb *p = list->entries[i];
		struct strbuf sm_gitdir = STRBUF_INIT;

		if (p->status == 'D' || p->status == 'T') {
			generate_submodule_summary(info, p);
			continue;
		}

		if (info->for_status && p->status != 'A' &&
		    (sub = submodule_from_path(the_repository,
					       null_oid(), p->sm_path))) {
			char *config_key = NULL;
			const char *value;
			int ignore_all = 0;

			config_key = xstrfmt("submodule.%s.ignore",
					     sub->name);
			if (!git_config_get_string_tmp(config_key, &value))
				ignore_all = !strcmp(value, "all");
			else if (sub->ignore)
				ignore_all = !strcmp(sub->ignore, "all");

			free(config_key);
			if (ignore_all)
				continue;
		}

		/* Also show added or modified modules which are checked out */
		strbuf_addstr(&sm_gitdir, p->sm_path);
		if (is_nonbare_repository_dir(&sm_gitdir))
			generate_submodule_summary(info, p);
		strbuf_release(&sm_gitdir);
	}
}

static void submodule_summary_callback(struct diff_queue_struct *q,
				       struct diff_options *options,
				       void *data)
{
	int i;
	struct module_cb_list *list = data;
	for (i = 0; i < q->nr; i++) {
		struct diff_filepair *p = q->queue[i];
		struct module_cb *temp;

		if (!S_ISGITLINK(p->one->mode) && !S_ISGITLINK(p->two->mode))
			continue;
		temp = (struct module_cb*)malloc(sizeof(struct module_cb));
		temp->mod_src = p->one->mode;
		temp->mod_dst = p->two->mode;
		temp->oid_src = p->one->oid;
		temp->oid_dst = p->two->oid;
		temp->status = p->status;
		temp->sm_path = xstrdup(p->one->path);

		ALLOC_GROW(list->entries, list->nr + 1, list->alloc);
		list->entries[list->nr++] = temp;
	}
}

static const char *get_diff_cmd(enum diff_cmd diff_cmd)
{
	switch (diff_cmd) {
	case DIFF_INDEX: return "diff-index";
	case DIFF_FILES: return "diff-files";
	default: BUG("bad diff_cmd value %d", diff_cmd);
	}
}

static int compute_summary_module_list(struct object_id *head_oid,
				       struct summary_cb *info,
				       enum diff_cmd diff_cmd)
{
	struct strvec diff_args = STRVEC_INIT;
	struct rev_info rev;
	struct module_cb_list list = MODULE_CB_LIST_INIT;

	strvec_push(&diff_args, get_diff_cmd(diff_cmd));
	if (info->cached)
		strvec_push(&diff_args, "--cached");
	strvec_pushl(&diff_args, "--ignore-submodules=dirty", "--raw", NULL);
	if (head_oid)
		strvec_push(&diff_args, oid_to_hex(head_oid));
	strvec_push(&diff_args, "--");
	if (info->argc)
		strvec_pushv(&diff_args, info->argv);

	git_config(git_diff_basic_config, NULL);
	init_revisions(&rev, info->prefix);
	rev.abbrev = 0;
	precompose_argv_prefix(diff_args.nr, diff_args.v, NULL);
	setup_revisions(diff_args.nr, diff_args.v, &rev, NULL);
	rev.diffopt.output_format = DIFF_FORMAT_NO_OUTPUT | DIFF_FORMAT_CALLBACK;
	rev.diffopt.format_callback = submodule_summary_callback;
	rev.diffopt.format_callback_data = &list;

	if (!info->cached) {
		if (diff_cmd == DIFF_INDEX)
			setup_work_tree();
		if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
			perror("read_cache_preload");
			return -1;
		}
	} else if (read_cache() < 0) {
		perror("read_cache");
		return -1;
	}

	if (diff_cmd == DIFF_INDEX)
		run_diff_index(&rev, info->cached);
	else
		run_diff_files(&rev, 0);
	prepare_submodule_summary(info, &list);
	strvec_clear(&diff_args);
	return 0;
}

static int module_summary(int argc, const char **argv, const char *prefix)
{
	struct summary_cb info = SUMMARY_CB_INIT;
	int cached = 0;
	int for_status = 0;
	int files = 0;
	int summary_limit = -1;
	enum diff_cmd diff_cmd = DIFF_INDEX;
	struct object_id head_oid;
	int ret;

	struct option module_summary_options[] = {
		OPT_BOOL(0, "cached", &cached,
			 N_("use the commit stored in the index instead of the submodule HEAD")),
		OPT_BOOL(0, "files", &files,
			 N_("compare the commit in the index with that in the submodule HEAD")),
		OPT_BOOL(0, "for-status", &for_status,
			 N_("skip submodules with 'ignore_config' value set to 'all'")),
		OPT_INTEGER('n', "summary-limit", &summary_limit,
			     N_("limit the summary size")),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper summary [<options>] [<commit>] [--] [<path>]"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_summary_options,
			     git_submodule_helper_usage, 0);

	if (!summary_limit)
		return 0;

	if (!get_oid(argc ? argv[0] : "HEAD", &head_oid)) {
		if (argc) {
			argv++;
			argc--;
		}
	} else if (!argc || !strcmp(argv[0], "HEAD")) {
		/* before the first commit: compare with an empty tree */
		oidcpy(&head_oid, the_hash_algo->empty_tree);
		if (argc) {
			argv++;
			argc--;
		}
	} else {
		if (get_oid("HEAD", &head_oid))
			die(_("could not fetch a revision for HEAD"));
	}

	if (files) {
		if (cached)
			die(_("options '%s' and '%s' cannot be used together"), "--cached", "--files");
		diff_cmd = DIFF_FILES;
	}

	info.argc = argc;
	info.argv = argv;
	info.prefix = prefix;
	info.cached = !!cached;
	info.files = !!files;
	info.for_status = !!for_status;
	info.summary_limit = summary_limit;

	ret = compute_summary_module_list((diff_cmd == DIFF_INDEX) ? &head_oid : NULL,
					  &info, diff_cmd);
	return ret;
}

struct sync_cb {
	const char *prefix;
	unsigned int flags;
};
#define SYNC_CB_INIT { 0 }

static void sync_submodule(const char *path, const char *prefix,
			   unsigned int flags)
{
	const struct submodule *sub;
	char *remote_key = NULL;
	char *sub_origin_url, *super_config_url, *displaypath, *default_remote;
	struct strbuf sb = STRBUF_INIT;
	char *sub_config_path = NULL;

	if (!is_submodule_active(the_repository, path))
		return;

	sub = submodule_from_path(the_repository, null_oid(), path);

	if (sub && sub->url) {
		if (starts_with_dot_dot_slash(sub->url) ||
		    starts_with_dot_slash(sub->url)) {
			char *up_path = get_up_path(path);
			sub_origin_url = resolve_relative_url(sub->url, up_path, 1);
			super_config_url = resolve_relative_url(sub->url, NULL, 1);
			free(up_path);
		} else {
			sub_origin_url = xstrdup(sub->url);
			super_config_url = xstrdup(sub->url);
		}
	} else {
		sub_origin_url = xstrdup("");
		super_config_url = xstrdup("");
	}

	displaypath = get_submodule_displaypath(path, prefix);

	if (!(flags & OPT_QUIET))
		printf(_("Synchronizing submodule url for '%s'\n"),
			 displaypath);

	strbuf_reset(&sb);
	strbuf_addf(&sb, "submodule.%s.url", sub->name);
	if (git_config_set_gently(sb.buf, super_config_url))
		die(_("failed to register url for submodule path '%s'"),
		      displaypath);

	if (!is_submodule_populated_gently(path, NULL))
		goto cleanup;

	strbuf_reset(&sb);
	default_remote = get_default_remote_submodule(path);
	if (!default_remote)
		die(_("failed to get the default remote for submodule '%s'"),
		      path);

	remote_key = xstrfmt("remote.%s.url", default_remote);
	free(default_remote);

	submodule_to_gitdir(&sb, path);
	strbuf_addstr(&sb, "/config");

	if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
		die(_("failed to update remote for submodule '%s'"),
		      path);

	if (flags & OPT_RECURSIVE) {
		struct child_process cpr = CHILD_PROCESS_INIT;

		cpr.git_cmd = 1;
		cpr.dir = path;
		prepare_submodule_repo_env(&cpr.env_array);

		strvec_push(&cpr.args, "--super-prefix");
		strvec_pushf(&cpr.args, "%s/", displaypath);
		strvec_pushl(&cpr.args, "submodule--helper", "sync",
			     "--recursive", NULL);

		if (flags & OPT_QUIET)
			strvec_push(&cpr.args, "--quiet");

		if (run_command(&cpr))
			die(_("failed to recurse into submodule '%s'"),
			      path);
	}

cleanup:
	free(super_config_url);
	free(sub_origin_url);
	strbuf_release(&sb);
	free(remote_key);
	free(displaypath);
	free(sub_config_path);
}

static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
{
	struct sync_cb *info = cb_data;
	sync_submodule(list_item->name, info->prefix, info->flags);
}

static int module_sync(int argc, const char **argv, const char *prefix)
{
	struct sync_cb info = SYNC_CB_INIT;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;
	int quiet = 0;
	int recursive = 0;

	struct option module_sync_options[] = {
		OPT__QUIET(&quiet, N_("suppress output of synchronizing submodule url")),
		OPT_BOOL(0, "recursive", &recursive,
			N_("recurse into nested submodules")),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_sync_options,
			     git_submodule_helper_usage, 0);

	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;

	info.prefix = prefix;
	if (quiet)
		info.flags |= OPT_QUIET;
	if (recursive)
		info.flags |= OPT_RECURSIVE;

	for_each_listed_submodule(&list, sync_submodule_cb, &info);

	return 0;
}

struct deinit_cb {
	const char *prefix;
	unsigned int flags;
};
#define DEINIT_CB_INIT { 0 }

static void deinit_submodule(const char *path, const char *prefix,
			     unsigned int flags)
{
	const struct submodule *sub;
	char *displaypath = NULL;
	struct child_process cp_config = CHILD_PROCESS_INIT;
	struct strbuf sb_config = STRBUF_INIT;
	char *sub_git_dir = xstrfmt("%s/.git", path);

	sub = submodule_from_path(the_repository, null_oid(), path);

	if (!sub || !sub->name)
		goto cleanup;

	displaypath = get_submodule_displaypath(path, prefix);

	/* remove the submodule work tree (unless the user already did it) */
	if (is_directory(path)) {
		struct strbuf sb_rm = STRBUF_INIT;
		const char *format;

		if (is_directory(sub_git_dir)) {
			if (!(flags & OPT_QUIET))
				warning(_("Submodule work tree '%s' contains a .git "
					  "directory. This will be replaced with a "
					  ".git file by using absorbgitdirs."),
					displaypath);

			absorb_git_dir_into_superproject(path,
							 ABSORB_GITDIR_RECURSE_SUBMODULES);

		}

		if (!(flags & OPT_FORCE)) {
			struct child_process cp_rm = CHILD_PROCESS_INIT;
			cp_rm.git_cmd = 1;
			strvec_pushl(&cp_rm.args, "rm", "-qn",
				     path, NULL);

			if (run_command(&cp_rm))
				die(_("Submodule work tree '%s' contains local "
				      "modifications; use '-f' to discard them"),
				      displaypath);
		}

		strbuf_addstr(&sb_rm, path);

		if (!remove_dir_recursively(&sb_rm, 0))
			format = _("Cleared directory '%s'\n");
		else
			format = _("Could not remove submodule work tree '%s'\n");

		if (!(flags & OPT_QUIET))
			printf(format, displaypath);

		submodule_unset_core_worktree(sub);

		strbuf_release(&sb_rm);
	}

	if (mkdir(path, 0777))
		printf(_("could not create empty submodule directory %s"),
		      displaypath);

	cp_config.git_cmd = 1;
	strvec_pushl(&cp_config.args, "config", "--get-regexp", NULL);
	strvec_pushf(&cp_config.args, "submodule.%s\\.", sub->name);

	/* remove the .git/config entries (unless the user already did it) */
	if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
		char *sub_key = xstrfmt("submodule.%s", sub->name);
		/*
		 * remove the whole section so we have a clean state when
		 * the user later decides to init this submodule again
		 */
		git_config_rename_section_in_file(NULL, sub_key, NULL);
		if (!(flags & OPT_QUIET))
			printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
				 sub->name, sub->url, displaypath);
		free(sub_key);
	}

cleanup:
	free(displaypath);
	free(sub_git_dir);
	strbuf_release(&sb_config);
}

static void deinit_submodule_cb(const struct cache_entry *list_item,
				void *cb_data)
{
	struct deinit_cb *info = cb_data;
	deinit_submodule(list_item->name, info->prefix, info->flags);
}

static int module_deinit(int argc, const char **argv, const char *prefix)
{
	struct deinit_cb info = DEINIT_CB_INIT;
	struct pathspec pathspec;
	struct module_list list = MODULE_LIST_INIT;
	int quiet = 0;
	int force = 0;
	int all = 0;

	struct option module_deinit_options[] = {
		OPT__QUIET(&quiet, N_("suppress submodule status output")),
		OPT__FORCE(&force, N_("remove submodule working trees even if they contain local changes"), 0),
		OPT_BOOL(0, "all", &all, N_("unregister all submodules")),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
		NULL
	};

	argc = parse_options(argc, argv, prefix, module_deinit_options,
			     git_submodule_helper_usage, 0);

	if (all && argc) {
		error("pathspec and --all are incompatible");
		usage_with_options(git_submodule_helper_usage,
				   module_deinit_options);
	}

	if (!argc && !all)
		die(_("Use '--all' if you really want to deinitialize all submodules"));

	if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
		return 1;

	info.prefix = prefix;
	if (quiet)
		info.flags |= OPT_QUIET;
	if (force)
		info.flags |= OPT_FORCE;

	for_each_listed_submodule(&list, deinit_submodule_cb, &info);

	return 0;
}

struct module_clone_data {
	const char *prefix;
	const char *path;
	const char *name;
	const char *url;
	const char *depth;
	struct list_objects_filter_options *filter_options;
	struct string_list reference;
	unsigned int quiet: 1;
	unsigned int progress: 1;
	unsigned int dissociate: 1;
	unsigned int require_init: 1;
	int single_branch;
};
#define MODULE_CLONE_DATA_INIT { \
	.reference = STRING_LIST_INIT_NODUP, \
	.single_branch = -1, \
}

struct submodule_alternate_setup {
	const char *submodule_name;
	enum SUBMODULE_ALTERNATE_ERROR_MODE {
		SUBMODULE_ALTERNATE_ERROR_DIE,
		SUBMODULE_ALTERNATE_ERROR_INFO,
		SUBMODULE_ALTERNATE_ERROR_IGNORE
	} error_mode;
	struct string_list *reference;
};
#define SUBMODULE_ALTERNATE_SETUP_INIT { \
	.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE, \
}

static const char alternate_error_advice[] = N_(
"An alternate computed from a superproject's alternate is invalid.\n"
"To allow Git to clone without an alternate in such a case, set\n"
"submodule.alternateErrorStrategy to 'info' or, equivalently, clone with\n"
"'--reference-if-able' instead of '--reference'."
);

static int add_possible_reference_from_superproject(
		struct object_directory *odb, void *sas_cb)
{
	struct submodule_alternate_setup *sas = sas_cb;
	size_t len;

	/*
	 * If the alternate object store is another repository, try the
	 * standard layout with .git/(modules/<name>)+/objects
	 */
	if (strip_suffix(odb->path, "/objects", &len)) {
		struct repository alternate;
		char *sm_alternate;
		struct strbuf sb = STRBUF_INIT;
		struct strbuf err = STRBUF_INIT;
		strbuf_add(&sb, odb->path, len);

		repo_init(&alternate, sb.buf, NULL);

		/*
		 * We need to end the new path with '/' to mark it as a dir,
		 * otherwise a submodule name containing '/' will be broken
		 * as the last part of a missing submodule reference would
		 * be taken as a file name.
		 */
		strbuf_reset(&sb);
		submodule_name_to_gitdir(&sb, &alternate, sas->submodule_name);
		strbuf_addch(&sb, '/');
		repo_clear(&alternate);

		sm_alternate = compute_alternate_path(sb.buf, &err);
		if (sm_alternate) {
			string_list_append(sas->reference, xstrdup(sb.buf));
			free(sm_alternate);
		} else {
			switch (sas->error_mode) {
			case SUBMODULE_ALTERNATE_ERROR_DIE:
				if (advice_enabled(ADVICE_SUBMODULE_ALTERNATE_ERROR_STRATEGY_DIE))
					advise(_(alternate_error_advice));
				die(_("submodule '%s' cannot add alternate: %s"),
				    sas->submodule_name, err.buf);
			case SUBMODULE_ALTERNATE_ERROR_INFO:
				fprintf_ln(stderr, _("submodule '%s' cannot add alternate: %s"),
					sas->submodule_name, err.buf);
			case SUBMODULE_ALTERNATE_ERROR_IGNORE:
				; /* nothing */
			}
		}
		strbuf_release(&sb);
	}

	return 0;
}

static void prepare_possible_alternates(const char *sm_name,
		struct string_list *reference)
{
	char *sm_alternate = NULL, *error_strategy = NULL;
	struct submodule_alternate_setup sas = SUBMODULE_ALTERNATE_SETUP_INIT;

	git_config_get_string("submodule.alternateLocation", &sm_alternate);
	if (!sm_alternate)
		return;

	git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);

	if (!error_strategy)
		error_strategy = xstrdup("die");

	sas.submodule_name = sm_name;
	sas.reference = reference;
	if (!strcmp(error_strategy, "die"))
		sas.error_mode = SUBMODULE_ALTERNATE_ERROR_DIE;
	else if (!strcmp(error_strategy, "info"))
		sas.error_mode = SUBMODULE_ALTERNATE_ERROR_INFO;
	else if (!strcmp(error_strategy, "ignore"))
		sas.error_mode = SUBMODULE_ALTERNATE_ERROR_IGNORE;
	else
		die(_("Value '%s' for submodule.alternateErrorStrategy is not recognized"), error_strategy);

	if (!strcmp(sm_alternate, "superproject"))
		foreach_alt_odb(add_possible_reference_from_superproject, &sas);
	else if (!strcmp(sm_alternate, "no"))
		; /* do nothing */
	else
		die(_("Value '%s' for submodule.alternateLocation is not recognized"), sm_alternate);

	free(sm_alternate);
	free(error_strategy);
}

static int clone_submodule(struct module_clone_data *clone_data)
{
	char *p, *sm_gitdir;
	char *sm_alternate = NULL, *error_strategy = NULL;
	struct strbuf sb = STRBUF_INIT;
	struct child_process cp = CHILD_PROCESS_INIT;

	submodule_name_to_gitdir(&sb, the_repository, clone_data->name);
	sm_gitdir = absolute_pathdup(sb.buf);
	strbuf_reset(&sb);

	if (!is_absolute_path(clone_data->path)) {
		strbuf_addf(&sb, "%s/%s", get_git_work_tree(), clone_data->path);
		clone_data->path = strbuf_detach(&sb, NULL);
	} else {
		clone_data->path = xstrdup(clone_data->path);
	}

	if (validate_submodule_git_dir(sm_gitdir, clone_data->name) < 0)
		die(_("refusing to create/use '%s' in another submodule's "
		      "git dir"), sm_gitdir);

	if (!file_exists(sm_gitdir)) {
		if (safe_create_leading_directories_const(sm_gitdir) < 0)
			die(_("could not create directory '%s'"), sm_gitdir);

		prepare_possible_alternates(clone_data->name, &clone_data->reference);

		strvec_push(&cp.args, "clone");
		strvec_push(&cp.args, "--no-checkout");
		if (clone_data->quiet)
			strvec_push(&cp.args, "--quiet");
		if (clone_data->progress)
			strvec_push(&cp.args, "--progress");
		if (clone_data->depth && *(clone_data->depth))
			strvec_pushl(&cp.args, "--depth", clone_data->depth, NULL);
		if (clone_data->reference.nr) {
			struct string_list_item *item;
			for_each_string_list_item(item, &clone_data->reference)
				strvec_pushl(&cp.args, "--reference",
					     item->string, NULL);
		}
		if (clone_data->dissociate)
			strvec_push(&cp.args, "--dissociate");
		if (sm_gitdir && *sm_gitdir)
			strvec_pushl(&cp.args, "--separate-git-dir", sm_gitdir, NULL);
		if (clone_data->filter_options && clone_data->filter_options->choice)
			strvec_pushf(&cp.args, "--filter=%s",
				     expand_list_objects_filter_spec(
					     clone_data->filter_options));
		if (clone_data->single_branch >= 0)
			strvec_push(&cp.args, clone_data->single_branch ?
				    "--single-branch" :
				    "--no-single-branch");

		strvec_push(&cp.args, "--");
		strvec_push(&cp.args, clone_data->url);
		strvec_push(&cp.args, clone_data->path);

		cp.git_cmd = 1;
		prepare_submodule_repo_env(&cp.env_array);
		cp.no_stdin = 1;

		if(run_command(&cp))
			die(_("clone of '%s' into submodule path '%s' failed"),
			    clone_data->url, clone_data->path);
	} else {
		if (clone_data->require_init && !access(clone_data->path, X_OK) &&
		    !is_empty_dir(clone_data->path))
			die(_("directory not empty: '%s'"), clone_data->path);
		if (safe_create_leading_directories_const(clone_data->path) < 0)
			die(_("could not create directory '%s'"), clone_data->path);
		strbuf_addf(&sb, "%s/index", sm_gitdir);
		unlink_or_warn(sb.buf);
		strbuf_reset(&sb);
	}

	connect_work_tree_and_git_dir(clone_data->path, sm_gitdir, 0);

	p = git_pathdup_submodule(clone_data->path, "config");
	if (!p)
		die(_("could not get submodule directory for '%s'"), clone_data->path);

	/* setup alternateLocation and alternateErrorStrategy in the cloned submodule if needed */
	git_config_get_string("submodule.alternateLocation", &sm_alternate);
	if (sm_alternate)
		git_config_set_in_file(p, "submodule.alternateLocation",
				       sm_alternate);
	git_config_get_string("submodule.alternateErrorStrategy", &error_strategy);
	if (error_strategy)
		git_config_set_in_file(p, "submodule.alternateErrorStrategy",
				       error_strategy);

	free(sm_alternate);
	free(error_strategy);

	strbuf_release(&sb);
	free(sm_gitdir);
	free(p);
	return 0;
}

static int module_clone(int argc, const char **argv, const char *prefix)
{
	int dissociate = 0, quiet = 0, progress = 0, require_init = 0;
	struct module_clone_data clone_data = MODULE_CLONE_DATA_INIT;
	struct list_objects_filter_options filter_options;

	struct option module_clone_options[] = {
		OPT_STRING(0, "prefix", &clone_data.prefix,
			   N_("path"),
			   N_("alternative anchor for relative paths")),
		OPT_STRING(0, "path", &clone_data.path,
			   N_("path"),
			   N_("where the new submodule will be cloned to")),
		OPT_STRING(0, "name", &clone_data.name,
			   N_("string"),
			   N_("name of the new submodule")),
		OPT_STRING(0, "url", &clone_data.url,
			   N_("string"),
			   N_("url where to clone the submodule from")),
		OPT_STRING_LIST(0, "reference", &clone_data.reference,
			   N_("repo"),
			   N_("reference repository")),
		OPT_BOOL(0, "dissociate", &dissociate,
			   N_("use --reference only while cloning")),
		OPT_STRING(0, "depth", &clone_data.depth,
			   N_("string"),
			   N_("depth for shallow clones")),
		OPT__QUIET(&quiet, "suppress output for cloning a submodule"),
		OPT_BOOL(0, "progress", &progress,
			   N_("force cloning progress")),
		OPT_BOOL(0, "require-init", &require_init,
			   N_("disallow cloning into non-empty directory")),
		OPT_BOOL(0, "single-branch", &clone_data.single_branch,
			 N_("clone only one branch, HEAD or --branch")),
		OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
		OPT_END()
	};

	const char *const git_submodule_helper_usage[] = {
		N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
		   "[--reference <repository>] [--name <name>] [--depth <depth>] "
		   "[--single-branch] [--filter <filter-spec>] "
		   "--url <url> --path <path>"),
		NULL
	};

	memset(&filter_options, 0, sizeof(filter_options));
	argc = parse_options(argc, argv, prefix, module_clone_options,
			     git_submodule_helper_usage, 0);

	clone_data.dissociate = !!dissociate;
	clone_data.quiet = !!quiet;
	clone_data.progress = !!progress;
	clone_data.require_init = !!require_init;
	clone_data.filter_options = &filter_options;

	if (argc || !clone_data.url || !clone_data.path || !*(clone_data.path))
		usage_with_options(git_submodule_helper_usage,
				   module_clone_options);

	clone_submodule(&clone_data);
	list_objects_filter_release(&filter_options);
	return 0;
}

static void determine_submodule_update_strategy(struct repository *r,
						int just_cloned,
						const char *path,
						const char *update,
						struct submodule_update_strategy *out)
{
	const struct submodule *sub = submodule_from_path(r, null_oid(), path);
	char *key;
	const char *val;

	key = xstrfmt("submodule.%s.update", sub->name);

	if (update) {
		if (parse_submodule_update_strategy(update, out) < 0)
			die(_("Invalid update mode '%s' for submodule path '%s'"),
				update, path);
	} else if (!repo_config_get_string_tmp(r, key, &val)) {
		if (parse_submodule_update_strategy(val, out) < 0)
			die(_("Invalid update mode '%s' configured for submodule path '%s'"),
				val, path);
	} else if (sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
		if (sub->update_strategy.type == SM_UPDATE_COMMAND)
			BUG("how did we read update = !command from .gitmodules?");
		out->type = sub->update_strategy.type;
		out->command = sub->update_strategy.command;
	} else
		out->type = SM_UPDATE_CHECKOUT;

	if (just_cloned &&
	    (out->type == SM_UPDATE_MERGE ||
	     out->type == SM_UPDATE_REBASE ||
	     out->type == SM_UPDATE_NONE))
		out->type = SM_UPDATE_CHECKOUT;

	free(key);
}

struct update_clone_data {
	const struct submodule *sub;
	struct object_id oid;
	unsigned just_cloned;
};

struct submodule_update_clone {
	/* index into 'update_data.list', the list of submodules to look into for cloning */
	int current;

	/* configuration parameters which are passed on to the children */
	struct update_data *update_data;

	/* to be consumed by update_submodule() */
	struct update_clone_data *update_clone;
	int update_clone_nr; int update_clone_alloc;

	/* If we want to stop as fast as possible and return an error */
	unsigned quickstop : 1;

	/* failed clones to be retried again */
	const struct cache_entry **failed_clones;
	int failed_clones_nr, failed_clones_alloc;
};
#define SUBMODULE_UPDATE_CLONE_INIT { 0 }

struct update_data {
	const char *prefix;
	const char *recursive_prefix;
	const char *displaypath;
	const char *update_default;
	struct object_id suboid;
	struct string_list references;
	struct submodule_update_strategy update_strategy;
	struct list_objects_filter_options *filter_options;
	struct module_list list;
	int depth;
	int max_jobs;
	int single_branch;
	int recommend_shallow;
	unsigned int require_init;
	unsigned int force;
	unsigned int quiet;
	unsigned int nofetch;
	unsigned int remote;
	unsigned int progress;
	unsigned int dissociate;
	unsigned int init;
	unsigned int warn_if_uninitialized;
	unsigned int recursive;

	/* copied over from update_clone_data */
	struct object_id oid;
	unsigned int just_cloned;
	const char *sm_path;
};
#define UPDATE_DATA_INIT { \
	.update_strategy = SUBMODULE_UPDATE_STRATEGY_INIT, \
	.list = MODULE_LIST_INIT, \
	.recommend_shallow = -1, \
	.references = STRING_LIST_INIT_DUP, \
	.single_branch = -1, \
	.max_jobs = 1, \
	.warn_if_uninitialized = 1, \
}

static void next_submodule_warn_missing(struct submodule_update_clone *suc,
		struct strbuf *out, const char *displaypath)
{
	/*
	 * Only mention uninitialized submodules when their
	 * paths have been specified.
	 */
	if (suc->update_data->warn_if_uninitialized) {
		strbuf_addf(out,
			_("Submodule path '%s' not initialized"),
			displaypath);
		strbuf_addch(out, '\n');
		strbuf_addstr(out,
			_("Maybe you want to use 'update --init'?"));
		strbuf_addch(out, '\n');
	}
}

/**
 * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
 * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
 */
static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
					   struct child_process *child,
					   struct submodule_update_clone *suc,
					   struct strbuf *out)
{
	const struct submodule *sub = NULL;
	const char *url = NULL;
	const char *update_string;
	enum submodule_update_type update_type;
	char *key;
	struct strbuf displaypath_sb = STRBUF_INIT;
	struct strbuf sb = STRBUF_INIT;
	const char *displaypath = NULL;
	int needs_cloning = 0;
	int need_free_url = 0;

	if (ce_stage(ce)) {
		if (suc->update_data->recursive_prefix)
			strbuf_addf(&sb, "%s/%s", suc->update_data->recursive_prefix, ce->name);
		else
			strbuf_addstr(&sb, ce->name);
		strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
		strbuf_addch(out, '\n');
		goto cleanup;
	}

	sub = submodule_from_path(the_repository, null_oid(), ce->name);

	if (suc->update_data->recursive_prefix)
		displaypath = relative_path(suc->update_data->recursive_prefix,
					    ce->name, &displaypath_sb);
	else
		displaypath = ce->name;

	if (!sub) {
		next_submodule_warn_missing(suc, out, displaypath);
		goto cleanup;
	}

	key = xstrfmt("submodule.%s.update", sub->name);
	if (!repo_config_get_string_tmp(the_repository, key, &update_string)) {
		update_type = parse_submodule_update_type(update_string);
	} else {
		update_type = sub->update_strategy.type;
	}
	free(key);

	if (suc->update_data->update_strategy.type == SM_UPDATE_NONE
	    || (suc->update_data->update_strategy.type == SM_UPDATE_UNSPECIFIED
		&& update_type == SM_UPDATE_NONE)) {
		strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
		strbuf_addch(out, '\n');
		goto cleanup;
	}

	/* Check if the submodule has been initialized. */
	if (!is_submodule_active(the_repository, ce->name)) {
		next_submodule_warn_missing(suc, out, displaypath);
		goto cleanup;
	}

	strbuf_reset(&sb);
	strbuf_addf(&sb, "submodule.%s.url", sub->name);
	if (repo_config_get_string_tmp(the_repository, sb.buf, &url)) {
		if (starts_with_dot_slash(sub->url) ||
		    starts_with_dot_dot_slash(sub->url)) {
			url = resolve_relative_url(sub->url, NULL, 0);
			need_free_url = 1;
		} else
			url = sub->url;
	}

	strbuf_reset(&sb);
	strbuf_addf(&sb, "%s/.git", ce->name);
	needs_cloning = !file_exists(sb.buf);

	ALLOC_GROW(suc->update_clone, suc->update_clone_nr + 1,
		   suc->update_clone_alloc);
	oidcpy(&suc->update_clone[suc->update_clone_nr].oid, &ce->oid);
	suc->update_clone[suc->update_clone_nr].just_cloned = needs_cloning;
	suc->update_clone[suc->update_clone_nr].sub = sub;
	suc->update_clone_nr++;

	if (!needs_cloning)
		goto cleanup;

	child->git_cmd = 1;
	child->no_stdin = 1;
	child->stdout_to_stderr = 1;
	child->err = -1;
	strvec_push(&child->args, "submodule--helper");
	strvec_push(&child->args, "clone");
	if (suc->update_data->progress)
		strvec_push(&child->args, "--progress");
	if (suc->update_data->quiet)
		strvec_push(&child->args, "--quiet");
	if (suc->update_data->prefix)
		strvec_pushl(&child->args, "--prefix", suc->update_data->prefix, NULL);
	if (suc->update_data->recommend_shallow && sub->recommend_shallow == 1)
		strvec_push(&child->args, "--depth=1");
	else if (suc->update_data->depth)
		strvec_pushf(&child->args, "--depth=%d", suc->update_data->depth);
	if (suc->update_data->filter_options && suc->update_data->filter_options->choice)
		strvec_pushf(&child->args, "--filter=%s",
			     expand_list_objects_filter_spec(suc->update_data->filter_options));
	if (suc->update_data->require_init)
		strvec_push(&child->args, "--require-init");
	strvec_pushl(&child->args, "--path", sub->path, NULL);
	strvec_pushl(&child->args, "--name", sub->name, NULL);
	strvec_pushl(&child->args, "--url", url, NULL);
	if (suc->update_data->references.nr) {
		struct string_list_item *item;
		for_each_string_list_item(item, &suc->update_data->references)
			strvec_pushl(&child->args, "--reference", item->string, NULL);
	}
	if (suc->update_data->dissociate)
		strvec_push(&child->args, "--dissociate");
	if (suc->update_data->single_branch >= 0)
		strvec_push(&child->args, suc->update_data->single_branch ?
					      "--single-branch" :
					      "--no-single-branch");

cleanup:
	strbuf_release(&displaypath_sb);
	strbuf_release(&sb);
	if (need_free_url)
		free((void*)url);

	return needs_cloning;
}

static int update_clone_get_next_task(struct child_process *child,
				      struct strbuf *err,
				      void *suc_cb,
				      void **idx_task_cb)
{
	struct submodule_update_clone *suc = suc_cb;
	const struct cache_entry *ce;
	int index;

	for (; suc->current < suc->update_data->list.nr; suc->current++) {
		ce = suc->update_data->list.entries[suc->current];
		if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
			int *p = xmalloc(sizeof(*p));
			*p = suc->current;
			*idx_task_cb = p;
			suc->current++;
			return 1;
		}
	}

	/*
	 * The loop above tried cloning each submodule once, now try the
	 * stragglers again, which we can imagine as an extension of the
	 * entry list.
	 */
	index = suc->current - suc->update_data->list.nr;
	if (index < suc->failed_clones_nr) {
		int *p;
		ce = suc->failed_clones[index];
		if (!prepare_to_clone_next_submodule(ce, child, suc, err)) {
			suc->current ++;
			strbuf_addstr(err, "BUG: submodule considered for "
					   "cloning, doesn't need cloning "
					   "any more?\n");
			return 0;
		}
		p = xmalloc(sizeof(*p));
		*p = suc->current;
		*idx_task_cb = p;
		suc->current ++;
		return 1;
	}

	return 0;
}

static int update_clone_start_failure(struct strbuf *err,
				      void *suc_cb,
				      void *idx_task_cb)
{
	struct submodule_update_clone *suc = suc_cb;
	suc->quickstop = 1;
	return 1;
}

static int update_clone_task_finished(int result,
				      struct strbuf *err,
				      void *suc_cb,
				      void *idx_task_cb)
{
	const struct cache_entry *ce;
	struct submodule_update_clone *suc = suc_cb;

	int *idxP = idx_task_cb;
	int idx = *idxP;
	free(idxP);

	if (!result)
		return 0;

	if (idx < suc->update_data->list.nr) {
		ce  = suc->update_data->list.entries[idx];
		strbuf_addf(err, _("Failed to clone '%s'. Retry scheduled"),
			    ce->name);
		strbuf_addch(err, '\n');
		ALLOC_GROW(suc->failed_clones,
			   suc->failed_clones_nr + 1,
			   suc->failed_clones_alloc);
		suc->failed_clones[suc->failed_clones_nr++] = ce;
		return 0;
	} else {
		idx -= suc->update_data->list.nr;
		ce  = suc->failed_clones[idx];
		strbuf_addf(err, _("Failed to clone '%s' a second time, aborting"),
			    ce->name);
		strbuf_addch(err, '\n');
		suc->quickstop = 1;
		return 1;
	}

	return 0;
}

static int git_update_clone_config(const char *var, const char *value,
				   void *cb)
{
	int *max_jobs = cb;
	if (!strcmp(var, "submodule.fetchjobs"))
		*max_jobs = parse_submodule_fetchjobs(var, value);
	return 0;
}

static int is_tip_reachable(const char *path, struct object_id *oid)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	struct strbuf rev = STRBUF_INIT;
	char *hex = oid_to_hex(oid);

	cp.git_cmd = 1;
	cp.dir = xstrdup(path);
	cp.no_stderr = 1;
	strvec_pushl(&cp.args, "rev-list", "-n", "1", hex, "--not", "--all", NULL);

	prepare_submodule_repo_env(&cp.env_array);

	if (capture_command(&cp, &rev, GIT_MAX_HEXSZ + 1) || rev.len)
		return 0;

	return 1;
}

static int fetch_in_submodule(const char *module_path, int depth, int quiet, struct object_id *oid)
{
	struct child_process cp = CHILD_PROCESS_INIT;

	prepare_submodule_repo_env(&cp.env_array);
	cp.git_cmd = 1;
	cp.dir = xstrdup(module_path);

	strvec_push(&cp.args, "fetch");
	if (quiet)
		strvec_push(&cp.args, "--quiet");
	if (depth)
		strvec_pushf(&cp.args, "--depth=%d", depth);
	if (oid) {
		char *hex = oid_to_hex(oid);
		char *remote = get_default_remote();