[thirdparty/git.git] / builtin-clone.c

/*
 * Builtin "git clone"
 *
 * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
 *		 2008 Daniel Barkalow <barkalow@iabervon.org>
 * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
 *
 * Clone a repository into a different directory that does not yet exist.
 */

#include "cache.h"
#include "parse-options.h"
#include "fetch-pack.h"
#include "refs.h"
#include "tree.h"
#include "tree-walk.h"
#include "unpack-trees.h"
#include "transport.h"
#include "strbuf.h"
#include "dir.h"
#include "pack-refs.h"
#include "sigchain.h"
#include "branch.h"
#include "remote.h"
#include "run-command.h"

/*
 * Overall FIXMEs:
 *  - respect DB_ENVIRONMENT for .git/objects.
 *
 * Implementation notes:
 *  - dropping use-separate-remote and no-separate-remote compatibility
 *
 */
static const char * const builtin_clone_usage[] = {
	"git clone [options] [--] <repo> [<dir>]",
	NULL
};

static int option_quiet, option_no_checkout, option_bare, option_mirror;
static int option_local, option_no_hardlinks, option_shared, option_recursive;
static char *option_template, *option_reference, *option_depth;
static char *option_origin = NULL;
static char *option_upload_pack = "git-upload-pack";
static int option_verbose;

static struct option builtin_clone_options[] = {
	OPT__QUIET(&option_quiet),
	OPT__VERBOSE(&option_verbose),
	OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
		    "don't create a checkout"),
	OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
	OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
	OPT_BOOLEAN(0, "mirror", &option_mirror,
		    "create a mirror repository (implies bare)"),
	OPT_BOOLEAN('l', "local", &option_local,
		    "to clone from a local repository"),
	OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
		    "don't use local hardlinks, always copy"),
	OPT_BOOLEAN('s', "shared", &option_shared,
		    "setup as shared repository"),
	OPT_BOOLEAN(0, "recursive", &option_recursive,
		    "setup as shared repository"),
	OPT_STRING(0, "template", &option_template, "path",
		   "path the template repository"),
	OPT_STRING(0, "reference", &option_reference, "repo",
		   "reference repository"),
	OPT_STRING('o', "origin", &option_origin, "branch",
		   "use <branch> instead of 'origin' to track upstream"),
	OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
		   "path to git-upload-pack on the remote"),
	OPT_STRING(0, "depth", &option_depth, "depth",
		    "create a shallow clone of that depth"),

	OPT_END()
};

static const char *argv_submodule[] = {
	"submodule", "update", "--init", "--recursive", NULL
};

static char *get_repo_path(const char *repo, int *is_bundle)
{
	static char *suffix[] = { "/.git", ".git", "" };
	static char *bundle_suffix[] = { ".bundle", "" };
	struct stat st;
	int i;

	for (i = 0; i < ARRAY_SIZE(suffix); i++) {
		const char *path;
		path = mkpath("%s%s", repo, suffix[i]);
		if (is_directory(path)) {
			*is_bundle = 0;
			return xstrdup(make_nonrelative_path(path));
		}
	}

	for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
		const char *path;
		path = mkpath("%s%s", repo, bundle_suffix[i]);
		if (!stat(path, &st) && S_ISREG(st.st_mode)) {
			*is_bundle = 1;
			return xstrdup(make_nonrelative_path(path));
		}
	}

	return NULL;
}

static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
{
	const char *end = repo + strlen(repo), *start;
	char *dir;

	/*
	 * Strip trailing spaces, slashes and /.git
	 */
	while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
		end--;
	if (end - repo > 5 && is_dir_sep(end[-5]) &&
	    !strncmp(end - 4, ".git", 4)) {
		end -= 5;
		while (repo < end && is_dir_sep(end[-1]))
			end--;
	}

	/*
	 * Find last component, but be prepared that repo could have
	 * the form  "remote.example.com:foo.git", i.e. no slash
	 * in the directory part.
	 */
	start = end;
	while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
		start--;

	/*
	 * Strip .{bundle,git}.
	 */
	if (is_bundle) {
		if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
			end -= 7;
	} else {
		if (end - start > 4 && !strncmp(end - 4, ".git", 4))
			end -= 4;
	}

	if (is_bare) {
		struct strbuf result = STRBUF_INIT;
		strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
		dir = strbuf_detach(&result, NULL);
	} else
		dir = xstrndup(start, end - start);
	/*
	 * Replace sequences of 'control' characters and whitespace
	 * with one ascii space, remove leading and trailing spaces.
	 */
	if (*dir) {
		char *out = dir;
		int prev_space = 1 /* strip leading whitespace */;
		for (end = dir; *end; ++end) {
			char ch = *end;
			if ((unsigned char)ch < '\x20')
				ch = '\x20';
			if (isspace(ch)) {
				if (prev_space)
					continue;
				prev_space = 1;
			} else
				prev_space = 0;
			*out++ = ch;
		}
		*out = '\0';
		if (out > dir && prev_space)
			out[-1] = '\0';
	}
	return dir;
}

static void strip_trailing_slashes(char *dir)
{
	char *end = dir + strlen(dir);

	while (dir < end - 1 && is_dir_sep(end[-1]))
		end--;
	*end = '\0';
}

static void setup_reference(const char *repo)
{
	const char *ref_git;
	char *ref_git_copy;

	struct remote *remote;
	struct transport *transport;
	const struct ref *extra;

	ref_git = make_absolute_path(option_reference);

	if (is_directory(mkpath("%s/.git/objects", ref_git)))
		ref_git = mkpath("%s/.git", ref_git);
	else if (!is_directory(mkpath("%s/objects", ref_git)))
		die("reference repository '%s' is not a local directory.",
		    option_reference);

	ref_git_copy = xstrdup(ref_git);

	add_to_alternates_file(ref_git_copy);

	remote = remote_get(ref_git_copy);
	transport = transport_get(remote, ref_git_copy);
	for (extra = transport_get_remote_refs(transport); extra;
	     extra = extra->next)
		add_extra_ref(extra->name, extra->old_sha1, 0);

	transport_disconnect(transport);

	free(ref_git_copy);
}

static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest)
{
	struct dirent *de;
	struct stat buf;
	int src_len, dest_len;
	DIR *dir;

	dir = opendir(src->buf);
	if (!dir)
		die_errno("failed to open '%s'", src->buf);

	if (mkdir(dest->buf, 0777)) {
		if (errno != EEXIST)
			die_errno("failed to create directory '%s'", dest->buf);
		else if (stat(dest->buf, &buf))
			die_errno("failed to stat '%s'", dest->buf);
		else if (!S_ISDIR(buf.st_mode))
			die("%s exists and is not a directory", dest->buf);
	}

	strbuf_addch(src, '/');
	src_len = src->len;
	strbuf_addch(dest, '/');
	dest_len = dest->len;

	while ((de = readdir(dir)) != NULL) {
		strbuf_setlen(src, src_len);
		strbuf_addstr(src, de->d_name);
		strbuf_setlen(dest, dest_len);
		strbuf_addstr(dest, de->d_name);
		if (stat(src->buf, &buf)) {
			warning ("failed to stat %s\n", src->buf);
			continue;
		}
		if (S_ISDIR(buf.st_mode)) {
			if (de->d_name[0] != '.')
				copy_or_link_directory(src, dest);
			continue;
		}

		if (unlink(dest->buf) && errno != ENOENT)
			die_errno("failed to unlink '%s'", dest->buf);
		if (!option_no_hardlinks) {
			if (!link(src->buf, dest->buf))
				continue;
			if (option_local)
				die_errno("failed to create link '%s'", dest->buf);
			option_no_hardlinks = 1;
		}
		if (copy_file(dest->buf, src->buf, 0666))
			die_errno("failed to copy file to '%s'", dest->buf);
	}
	closedir(dir);
}

static const struct ref *clone_local(const char *src_repo,
				     const char *dest_repo)
{
	const struct ref *ret;
	struct strbuf src = STRBUF_INIT;
	struct strbuf dest = STRBUF_INIT;
	struct remote *remote;
	struct transport *transport;

	if (option_shared)
		add_to_alternates_file(src_repo);
	else {
		strbuf_addf(&src, "%s/objects", src_repo);
		strbuf_addf(&dest, "%s/objects", dest_repo);
		copy_or_link_directory(&src, &dest);
		strbuf_release(&src);
		strbuf_release(&dest);
	}

	remote = remote_get(src_repo);
	transport = transport_get(remote, src_repo);
	ret = transport_get_remote_refs(transport);
	transport_disconnect(transport);
	return ret;
}

static const char *junk_work_tree;
static const char *junk_git_dir;
static pid_t junk_pid;

static void remove_junk(void)
{
	struct strbuf sb = STRBUF_INIT;
	if (getpid() != junk_pid)
		return;
	if (junk_git_dir) {
		strbuf_addstr(&sb, junk_git_dir);
		remove_dir_recursively(&sb, 0);
		strbuf_reset(&sb);
	}
	if (junk_work_tree) {
		strbuf_addstr(&sb, junk_work_tree);
		remove_dir_recursively(&sb, 0);
		strbuf_reset(&sb);
	}
}

static void remove_junk_on_signal(int signo)
{
	remove_junk();
	sigchain_pop(signo);
	raise(signo);
}

static struct ref *write_remote_refs(const struct ref *refs,
		struct refspec *refspec, const char *reflog)
{
	struct ref *local_refs = NULL;
	struct ref **tail = &local_refs;
	struct ref *r;

	get_fetch_map(refs, refspec, &tail, 0);
	if (!option_mirror)
		get_fetch_map(refs, tag_refspec, &tail, 0);

	for (r = local_refs; r; r = r->next)
		add_extra_ref(r->peer_ref->name, r->old_sha1, 0);

	pack_refs(PACK_REFS_ALL);
	clear_extra_refs();

	return local_refs;
}

int cmd_clone(int argc, const char **argv, const char *prefix)
{
	int is_bundle = 0;
	struct stat buf;
	const char *repo_name, *repo, *work_tree, *git_dir;
	char *path, *dir;
	int dest_exists;
	const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;
	struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
	struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
	struct transport *transport = NULL;
	char *src_ref_prefix = "refs/heads/";
	int err = 0;

	struct refspec *refspec;
	const char *fetch_pattern;

	junk_pid = getpid();

	argc = parse_options(argc, argv, prefix, builtin_clone_options,
			     builtin_clone_usage, 0);

	if (argc == 0)
		die("You must specify a repository to clone.");

	if (option_mirror)
		option_bare = 1;

	if (option_bare) {
		if (option_origin)
			die("--bare and --origin %s options are incompatible.",
			    option_origin);
		option_no_checkout = 1;
	}

	if (!option_origin)
		option_origin = "origin";

	repo_name = argv[0];

	path = get_repo_path(repo_name, &is_bundle);
	if (path)
		repo = xstrdup(make_nonrelative_path(repo_name));
	else if (!strchr(repo_name, ':'))
		repo = xstrdup(make_absolute_path(repo_name));
	else
		repo = repo_name;

	if (argc == 2)
		dir = xstrdup(argv[1]);
	else
		dir = guess_dir_name(repo_name, is_bundle, option_bare);
	strip_trailing_slashes(dir);

	dest_exists = !stat(dir, &buf);
	if (dest_exists && !is_empty_dir(dir))
		die("destination path '%s' already exists and is not "
			"an empty directory.", dir);

	strbuf_addf(&reflog_msg, "clone: from %s", repo);

	if (option_bare)
		work_tree = NULL;
	else {
		work_tree = getenv("GIT_WORK_TREE");
		if (work_tree && !stat(work_tree, &buf))
			die("working tree '%s' already exists.", work_tree);
	}

	if (option_bare || work_tree)
		git_dir = xstrdup(dir);
	else {
		work_tree = dir;
		git_dir = xstrdup(mkpath("%s/.git", dir));
	}

	if (!option_bare) {
		junk_work_tree = work_tree;
		if (safe_create_leading_directories_const(work_tree) < 0)
			die_errno("could not create leading directories of '%s'",
				  work_tree);
		if (!dest_exists && mkdir(work_tree, 0755))
			die_errno("could not create work tree dir '%s'.",
				  work_tree);
		set_git_work_tree(work_tree);
	}
	junk_git_dir = git_dir;
	atexit(remove_junk);
	sigchain_push_common(remove_junk_on_signal);

	setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);

	if (safe_create_leading_directories_const(git_dir) < 0)
		die("could not create leading directories of '%s'", git_dir);
	set_git_dir(make_absolute_path(git_dir));

	init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);

	/*
	 * At this point, the config exists, so we do not need the
	 * environment variable.  We actually need to unset it, too, to
	 * re-enable parsing of the global configs.
	 */
	unsetenv(CONFIG_ENVIRONMENT);

	if (option_reference)
		setup_reference(git_dir);

	git_config(git_default_config, NULL);

	if (option_bare) {
		if (option_mirror)
			src_ref_prefix = "refs/";
		strbuf_addstr(&branch_top, src_ref_prefix);

		git_config_set("core.bare", "true");
	} else {
		strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
	}

	strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);

	if (option_mirror || !option_bare) {
		/* Configure the remote */
		strbuf_addf(&key, "remote.%s.fetch", option_origin);
		git_config_set_multivar(key.buf, value.buf, "^$", 0);
		strbuf_reset(&key);

		if (option_mirror) {
			strbuf_addf(&key, "remote.%s.mirror", option_origin);
			git_config_set(key.buf, "true");
			strbuf_reset(&key);
		}

		strbuf_addf(&key, "remote.%s.url", option_origin);
		git_config_set(key.buf, repo);
		strbuf_reset(&key);
	}

	fetch_pattern = value.buf;
	refspec = parse_fetch_refspec(1, &fetch_pattern);

	strbuf_reset(&value);

	if (path && !is_bundle)
		refs = clone_local(path, git_dir);
	else {
		struct remote *remote = remote_get(argv[0]);
		transport = transport_get(remote, remote->url[0]);

		if (!transport->get_refs_list || !transport->fetch)
			die("Don't know how to clone %s", transport->url);

		transport_set_option(transport, TRANS_OPT_KEEP, "yes");

		if (option_depth)
			transport_set_option(transport, TRANS_OPT_DEPTH,
					     option_depth);

		if (option_quiet)
			transport->verbose = -1;
		else if (option_verbose)
			transport->progress = 1;

		if (option_upload_pack)
			transport_set_option(transport, TRANS_OPT_UPLOADPACK,
					     option_upload_pack);

		refs = transport_get_remote_refs(transport);
		if (refs)
			transport_fetch_refs(transport, refs);
	}

	if (refs) {
		clear_extra_refs();

		mapped_refs = write_remote_refs(refs, refspec, reflog_msg.buf);

		remote_head = find_ref_by_name(refs, "HEAD");
		head_points_at = guess_remote_head(remote_head, mapped_refs, 0);
	}
	else {
		warning("You appear to have cloned an empty repository.");
		head_points_at = NULL;
		remote_head = NULL;
		option_no_checkout = 1;
		if (!option_bare)
			install_branch_config(0, "master", option_origin,
					      "refs/heads/master");
	}

	if (head_points_at) {
		/* Local default branch link */
		create_symref("HEAD", head_points_at->name, NULL);

		if (!option_bare) {
			struct strbuf head_ref = STRBUF_INIT;
			const char *head = head_points_at->name;

			if (!prefixcmp(head, "refs/heads/"))
				head += 11;

			/* Set up the initial local branch */

			/* Local branch initial value */
			update_ref(reflog_msg.buf, "HEAD",
				   head_points_at->old_sha1,
				   NULL, 0, DIE_ON_ERR);

			strbuf_addstr(&head_ref, branch_top.buf);
			strbuf_addstr(&head_ref, "HEAD");

			/* Remote branch link */
			create_symref(head_ref.buf,
				      head_points_at->peer_ref->name,
				      reflog_msg.buf);

			install_branch_config(0, head, option_origin,
					      head_points_at->name);
		}
	} else if (remote_head) {
		/* Source had detached HEAD pointing somewhere. */
		if (!option_bare)
			update_ref(reflog_msg.buf, "HEAD",
				   remote_head->old_sha1,
				   NULL, REF_NODEREF, DIE_ON_ERR);
	} else {
		/* Nothing to checkout out */
		if (!option_no_checkout)
			warning("remote HEAD refers to nonexistent ref, "
				"unable to checkout.\n");
		option_no_checkout = 1;
	}

	if (transport)
		transport_unlock_pack(transport);

	if (!option_no_checkout) {
		struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
		struct unpack_trees_options opts;
		struct tree *tree;
		struct tree_desc t;
		int fd;

		/* We need to be in the new work tree for the checkout */
		setup_work_tree();

		fd = hold_locked_index(lock_file, 1);

		memset(&opts, 0, sizeof opts);
		opts.update = 1;
		opts.merge = 1;
		opts.fn = oneway_merge;
		opts.verbose_update = !option_quiet;
		opts.src_index = &the_index;
		opts.dst_index = &the_index;

		tree = parse_tree_indirect(remote_head->old_sha1);
		parse_tree(tree);
		init_tree_desc(&t, tree->buffer, tree->size);
		unpack_trees(1, &t, &opts);

		if (write_cache(fd, active_cache, active_nr) ||
		    commit_locked_index(lock_file))
			die("unable to write new index file");

		err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
				sha1_to_hex(remote_head->old_sha1), "1", NULL);

		if (!err && option_recursive)
			err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
	}

	strbuf_release(&reflog_msg);
	strbuf_release(&branch_top);
	strbuf_release(&key);
	strbuf_release(&value);
	junk_pid = 0;
	return err;
}
Commit	Line	Data
8434c2f1 DB	1	/*
	2	* Builtin "git clone"
	3	*
	4	* Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
	5	* 2008 Daniel Barkalow <barkalow@iabervon.org>
	6	* Based on git-commit.sh by Junio C Hamano and Linus Torvalds
	7	*
	8	* Clone a repository into a different directory that does not yet exist.
	9	*/
	10
	11	#include "cache.h"
	12	#include "parse-options.h"
	13	#include "fetch-pack.h"
	14	#include "refs.h"
	15	#include "tree.h"
	16	#include "tree-walk.h"
	17	#include "unpack-trees.h"
	18	#include "transport.h"
	19	#include "strbuf.h"
	20	#include "dir.h"
3e8aded2	21	#include "pack-refs.h"
4a16d072	22	#include "sigchain.h"
a9f2c136	23	#include "branch.h"
8ef51733	24	#include "remote.h"
dfa7a6c5	25	#include "run-command.h"
8434c2f1 DB	26
	27	/*
	28	* Overall FIXMEs:
	29	* - respect DB_ENVIRONMENT for .git/objects.
	30	*
	31	* Implementation notes:
	32	* - dropping use-separate-remote and no-separate-remote compatibility
	33	*
	34	*/
	35	static const char * const builtin_clone_usage[] = {
1b1dd23f	36	"git clone [options] [--] <repo> [<dir>]",
8434c2f1 DB	37	NULL
	38	};
	39
bc699afc	40	static int option_quiet, option_no_checkout, option_bare, option_mirror;
e7fed18a	41	static int option_local, option_no_hardlinks, option_shared, option_recursive;
8434c2f1 DB	42	static char option_template, option_reference, *option_depth;
	43	static char *option_origin = NULL;
	44	static char *option_upload_pack = "git-upload-pack";
21188b1e	45	static int option_verbose;
8434c2f1 DB	46
	47	static struct option builtin_clone_options[] = {
	48	OPT__QUIET(&option_quiet),
21188b1e	49	OPT__VERBOSE(&option_verbose),
8434c2f1 DB	50	OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
	51	"don't create a checkout"),
	52	OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
	53	OPT_BOOLEAN(0, "naked", &option_bare, "create a bare repository"),
bc699afc JS	54	OPT_BOOLEAN(0, "mirror", &option_mirror,
bc699afc JS	55	"create a mirror repository (implies bare)"),
8434c2f1 DB	56	OPT_BOOLEAN('l', "local", &option_local,
	57	"to clone from a local repository"),
	58	OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
	59	"don't use local hardlinks, always copy"),
	60	OPT_BOOLEAN('s', "shared", &option_shared,
	61	"setup as shared repository"),
e7fed18a JH	62	OPT_BOOLEAN(0, "recursive", &option_recursive,
e7fed18a JH	63	"setup as shared repository"),
8434c2f1 DB	64	OPT_STRING(0, "template", &option_template, "path",
	65	"path the template repository"),
	66	OPT_STRING(0, "reference", &option_reference, "repo",
	67	"reference repository"),
	68	OPT_STRING('o', "origin", &option_origin, "branch",
02ed2458	69	"use <branch> instead of 'origin' to track upstream"),
8434c2f1 DB	70	OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
	71	"path to git-upload-pack on the remote"),
	72	OPT_STRING(0, "depth", &option_depth, "depth",
	73	"create a shallow clone of that depth"),
	74
	75	OPT_END()
	76	};
	77
e7fed18a JH	78	static const char *argv_submodule[] = {
	79	"submodule", "update", "--init", "--recursive", NULL
	80	};
	81
8434c2f1 DB	82	static char get_repo_path(const char repo, int *is_bundle)
	83	{
	84	static char *suffix[] = { "/.git", ".git", "" };
	85	static char *bundle_suffix[] = { ".bundle", "" };
	86	struct stat st;
	87	int i;
	88
	89	for (i = 0; i < ARRAY_SIZE(suffix); i++) {
	90	const char *path;
	91	path = mkpath("%s%s", repo, suffix[i]);
90b4a71c	92	if (is_directory(path)) {
8434c2f1	93	*is_bundle = 0;
1b9a9467	94	return xstrdup(make_nonrelative_path(path));
8434c2f1 DB	95	}
	96	}
	97
	98	for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
	99	const char *path;
	100	path = mkpath("%s%s", repo, bundle_suffix[i]);
	101	if (!stat(path, &st) && S_ISREG(st.st_mode)) {
	102	*is_bundle = 1;
1b9a9467	103	return xstrdup(make_nonrelative_path(path));
8434c2f1 DB	104	}
	105	}
	106
	107	return NULL;
	108	}
	109
6612f877	110	static char guess_dir_name(const char repo, int is_bundle, int is_bare)
8434c2f1	111	{
b8c5db35	112	const char end = repo + strlen(repo), start;
8a94bc7b	113	char *dir;
b8c5db35 JS	114
b8c5db35 JS	115	/*
8a94bc7b	116	* Strip trailing spaces, slashes and /.git
b8c5db35	117	*/
8a94bc7b	118	while (repo < end && (is_dir_sep(end[-1]) \|\| isspace(end[-1])))
b8c5db35 JS	119	end--;
	120	if (end - repo > 5 && is_dir_sep(end[-5]) &&
	121	!strncmp(end - 4, ".git", 4)) {
	122	end -= 5;
	123	while (repo < end && is_dir_sep(end[-1]))
	124	end--;
	125	}
	126
	127	/*
	128	* Find last component, but be prepared that repo could have
	129	* the form "remote.example.com:foo.git", i.e. no slash
	130	* in the directory part.
	131	*/
	132	start = end;
	133	while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
	134	start--;
	135
	136	/*
	137	* Strip .{bundle,git}.
	138	*/
	139	if (is_bundle) {
	140	if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
	141	end -= 7;
	142	} else {
	143	if (end - start > 4 && !strncmp(end - 4, ".git", 4))
	144	end -= 4;
8434c2f1 DB	145	}
8434c2f1 DB	146
6612f877	147	if (is_bare) {
32716a2c MV	148	struct strbuf result = STRBUF_INIT;
32716a2c MV	149	strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
2af202be	150	dir = strbuf_detach(&result, NULL);
8a94bc7b AR	151	} else
	152	dir = xstrndup(start, end - start);
	153	/*
	154	* Replace sequences of 'control' characters and whitespace
	155	* with one ascii space, remove leading and trailing spaces.
	156	*/
	157	if (*dir) {
	158	char *out = dir;
	159	int prev_space = 1 /* strip leading whitespace */;
	160	for (end = dir; *end; ++end) {
	161	char ch = *end;
	162	if ((unsigned char)ch < '\x20')
	163	ch = '\x20';
	164	if (isspace(ch)) {
	165	if (prev_space)
	166	continue;
	167	prev_space = 1;
	168	} else
	169	prev_space = 0;
	170	*out++ = ch;
	171	}
	172	*out = '\0';
	173	if (out > dir && prev_space)
	174	out[-1] = '\0';
6612f877	175	}
8a94bc7b	176	return dir;
8434c2f1 DB	177	}
8434c2f1 DB	178
44a68fd5 CB	179	static void strip_trailing_slashes(char *dir)
	180	{
	181	char *end = dir + strlen(dir);
	182
	183	while (dir < end - 1 && is_dir_sep(end[-1]))
	184	end--;
	185	*end = '\0';
	186	}
	187
8434c2f1 DB	188	static void setup_reference(const char *repo)
	189	{
	190	const char *ref_git;
	191	char *ref_git_copy;
	192
	193	struct remote *remote;
	194	struct transport *transport;
	195	const struct ref *extra;
	196
	197	ref_git = make_absolute_path(option_reference);
	198
	199	if (is_directory(mkpath("%s/.git/objects", ref_git)))
	200	ref_git = mkpath("%s/.git", ref_git);
	201	else if (!is_directory(mkpath("%s/objects", ref_git)))
	202	die("reference repository '%s' is not a local directory.",
	203	option_reference);
	204
	205	ref_git_copy = xstrdup(ref_git);
	206
	207	add_to_alternates_file(ref_git_copy);
	208
	209	remote = remote_get(ref_git_copy);
	210	transport = transport_get(remote, ref_git_copy);
	211	for (extra = transport_get_remote_refs(transport); extra;
	212	extra = extra->next)
	213	add_extra_ref(extra->name, extra->old_sha1, 0);
	214
	215	transport_disconnect(transport);
	216
	217	free(ref_git_copy);
	218	}
	219
b9e125e0	220	static void copy_or_link_directory(struct strbuf src, struct strbuf dest)
8434c2f1 DB	221	{
	222	struct dirent *de;
	223	struct stat buf;
	224	int src_len, dest_len;
	225	DIR *dir;
	226
b9e125e0	227	dir = opendir(src->buf);
8434c2f1	228	if (!dir)
0721c314	229	die_errno("failed to open '%s'", src->buf);
8434c2f1	230
b9e125e0	231	if (mkdir(dest->buf, 0777)) {
8434c2f1	232	if (errno != EEXIST)
0721c314	233	die_errno("failed to create directory '%s'", dest->buf);
b9e125e0	234	else if (stat(dest->buf, &buf))
0721c314	235	die_errno("failed to stat '%s'", dest->buf);
8434c2f1	236	else if (!S_ISDIR(buf.st_mode))
d7530708	237	die("%s exists and is not a directory", dest->buf);
8434c2f1 DB	238	}
8434c2f1 DB	239
b9e125e0 MV	240	strbuf_addch(src, '/');
	241	src_len = src->len;
	242	strbuf_addch(dest, '/');
	243	dest_len = dest->len;
8434c2f1 DB	244
8434c2f1 DB	245	while ((de = readdir(dir)) != NULL) {
b9e125e0 MV	246	strbuf_setlen(src, src_len);
	247	strbuf_addstr(src, de->d_name);
	248	strbuf_setlen(dest, dest_len);
	249	strbuf_addstr(dest, de->d_name);
	250	if (stat(src->buf, &buf)) {
	251	warning ("failed to stat %s\n", src->buf);
8434c2f1 DB	252	continue;
	253	}
	254	if (S_ISDIR(buf.st_mode)) {
	255	if (de->d_name[0] != '.')
	256	copy_or_link_directory(src, dest);
	257	continue;
	258	}
	259
b9e125e0	260	if (unlink(dest->buf) && errno != ENOENT)
d824cbba	261	die_errno("failed to unlink '%s'", dest->buf);
fdabc242	262	if (!option_no_hardlinks) {
b9e125e0	263	if (!link(src->buf, dest->buf))
fdabc242 DB	264	continue;
fdabc242 DB	265	if (option_local)
0721c314	266	die_errno("failed to create link '%s'", dest->buf);
fdabc242	267	option_no_hardlinks = 1;
8434c2f1	268	}
b9e125e0	269	if (copy_file(dest->buf, src->buf, 0666))
0721c314	270	die_errno("failed to copy file to '%s'", dest->buf);
8434c2f1	271	}
689ef4d4	272	closedir(dir);
8434c2f1 DB	273	}
	274
	275	static const struct ref clone_local(const char src_repo,
	276	const char *dest_repo)
	277	{
	278	const struct ref *ret;
b9e125e0 MV	279	struct strbuf src = STRBUF_INIT;
b9e125e0 MV	280	struct strbuf dest = STRBUF_INIT;
8434c2f1 DB	281	struct remote *remote;
	282	struct transport *transport;
	283
	284	if (option_shared)
	285	add_to_alternates_file(src_repo);
	286	else {
b9e125e0 MV	287	strbuf_addf(&src, "%s/objects", src_repo);
	288	strbuf_addf(&dest, "%s/objects", dest_repo);
	289	copy_or_link_directory(&src, &dest);
	290	strbuf_release(&src);
	291	strbuf_release(&dest);
8434c2f1 DB	292	}
	293
	294	remote = remote_get(src_repo);
	295	transport = transport_get(remote, src_repo);
	296	ret = transport_get_remote_refs(transport);
	297	transport_disconnect(transport);
	298	return ret;
	299	}
	300
	301	static const char *junk_work_tree;
	302	static const char *junk_git_dir;
e161acd1	303	static pid_t junk_pid;
8434c2f1 DB	304
	305	static void remove_junk(void)
	306	{
f285a2d7	307	struct strbuf sb = STRBUF_INIT;
8434c2f1 DB	308	if (getpid() != junk_pid)
8434c2f1 DB	309	return;
8434c2f1 DB	310	if (junk_git_dir) {
	311	strbuf_addstr(&sb, junk_git_dir);
	312	remove_dir_recursively(&sb, 0);
	313	strbuf_reset(&sb);
	314	}
	315	if (junk_work_tree) {
	316	strbuf_addstr(&sb, junk_work_tree);
	317	remove_dir_recursively(&sb, 0);
	318	strbuf_reset(&sb);
	319	}
	320	}
	321
	322	static void remove_junk_on_signal(int signo)
	323	{
	324	remove_junk();
4a16d072	325	sigchain_pop(signo);
8434c2f1 DB	326	raise(signo);
	327	}
	328
8434c2f1 DB	329	static struct ref write_remote_refs(const struct ref refs,
	330	struct refspec refspec, const char reflog)
	331	{
	332	struct ref *local_refs = NULL;
	333	struct ref **tail = &local_refs;
	334	struct ref *r;
	335
	336	get_fetch_map(refs, refspec, &tail, 0);
468386a9 JS	337	if (!option_mirror)
468386a9 JS	338	get_fetch_map(refs, tag_refspec, &tail, 0);
8434c2f1 DB	339
8434c2f1 DB	340	for (r = local_refs; r; r = r->next)
3e8aded2 JH	341	add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
	342
	343	pack_refs(PACK_REFS_ALL);
	344	clear_extra_refs();
	345
8434c2f1 DB	346	return local_refs;
	347	}
	348
	349	int cmd_clone(int argc, const char *argv, const char prefix)
	350	{
8434c2f1 DB	351	int is_bundle = 0;
	352	struct stat buf;
	353	const char repo_name, repo, work_tree, git_dir;
	354	char path, dir;
55892d23	355	int dest_exists;
8434c2f1	356	const struct ref refs, head_points_at, remote_head, mapped_refs;
b5ff37ac MV	357	struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
b5ff37ac MV	358	struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
1db4a75c	359	struct transport *transport = NULL;
bc699afc	360	char *src_ref_prefix = "refs/heads/";
dfa7a6c5	361	int err = 0;
8434c2f1	362
689f0396 DB	363	struct refspec *refspec;
689f0396 DB	364	const char *fetch_pattern;
8434c2f1 DB	365
	366	junk_pid = getpid();
	367
37782920	368	argc = parse_options(argc, argv, prefix, builtin_clone_options,
8434c2f1 DB	369	builtin_clone_usage, 0);
	370
	371	if (argc == 0)
	372	die("You must specify a repository to clone.");
	373
bc699afc JS	374	if (option_mirror)
	375	option_bare = 1;
	376
8434c2f1 DB	377	if (option_bare) {
	378	if (option_origin)
	379	die("--bare and --origin %s options are incompatible.",
	380	option_origin);
	381	option_no_checkout = 1;
8434c2f1 DB	382	}
	383
	384	if (!option_origin)
	385	option_origin = "origin";
	386
	387	repo_name = argv[0];
	388
	389	path = get_repo_path(repo_name, &is_bundle);
	390	if (path)
86521aca	391	repo = xstrdup(make_nonrelative_path(repo_name));
8434c2f1 DB	392	else if (!strchr(repo_name, ':'))
	393	repo = xstrdup(make_absolute_path(repo_name));
	394	else
	395	repo = repo_name;
	396
	397	if (argc == 2)
	398	dir = xstrdup(argv[1]);
	399	else
6612f877	400	dir = guess_dir_name(repo_name, is_bundle, option_bare);
44a68fd5	401	strip_trailing_slashes(dir);
8434c2f1	402
55892d23 AP	403	dest_exists = !stat(dir, &buf);
	404	if (dest_exists && !is_empty_dir(dir))
	405	die("destination path '%s' already exists and is not "
	406	"an empty directory.", dir);
8434c2f1	407
8434c2f1 DB	408	strbuf_addf(&reflog_msg, "clone: from %s", repo);
	409
	410	if (option_bare)
	411	work_tree = NULL;
	412	else {
	413	work_tree = getenv("GIT_WORK_TREE");
	414	if (work_tree && !stat(work_tree, &buf))
	415	die("working tree '%s' already exists.", work_tree);
	416	}
	417
	418	if (option_bare \|\| work_tree)
	419	git_dir = xstrdup(dir);
	420	else {
	421	work_tree = dir;
	422	git_dir = xstrdup(mkpath("%s/.git", dir));
	423	}
	424
	425	if (!option_bare) {
	426	junk_work_tree = work_tree;
8e21d63b	427	if (safe_create_leading_directories_const(work_tree) < 0)
d824cbba TR	428	die_errno("could not create leading directories of '%s'",
d824cbba TR	429	work_tree);
55892d23	430	if (!dest_exists && mkdir(work_tree, 0755))
d824cbba TR	431	die_errno("could not create work tree dir '%s'.",
d824cbba TR	432	work_tree);
8434c2f1 DB	433	set_git_work_tree(work_tree);
	434	}
	435	junk_git_dir = git_dir;
	436	atexit(remove_junk);
57b235a4	437	sigchain_push_common(remove_junk_on_signal);
8434c2f1	438
50b5f420	439	setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
8434c2f1	440
8e21d63b JK	441	if (safe_create_leading_directories_const(git_dir) < 0)
8e21d63b JK	442	die("could not create leading directories of '%s'", git_dir);
8434c2f1 DB	443	set_git_dir(make_absolute_path(git_dir));
8434c2f1 DB	444
8434c2f1 DB	445	init_db(option_template, option_quiet ? INIT_DB_QUIET : 0);
8434c2f1 DB	446
5b8063b5 JS	447	/*
	448	* At this point, the config exists, so we do not need the
	449	* environment variable. We actually need to unset it, too, to
	450	* re-enable parsing of the global configs.
	451	*/
	452	unsetenv(CONFIG_ENVIRONMENT);
	453
8434c2f1 DB	454	if (option_reference)
	455	setup_reference(git_dir);
	456
9bd81e42	457	git_config(git_default_config, NULL);
8434c2f1 DB	458
8434c2f1 DB	459	if (option_bare) {
bc699afc JS	460	if (option_mirror)
bc699afc JS	461	src_ref_prefix = "refs/";
b5ff37ac	462	strbuf_addstr(&branch_top, src_ref_prefix);
8434c2f1 DB	463
	464	git_config_set("core.bare", "true");
	465	} else {
b5ff37ac	466	strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
bc699afc	467	}
8434c2f1	468
689f0396 DB	469	strbuf_addf(&value, "+%s:%s", src_ref_prefix, branch_top.buf);
689f0396 DB	470
bc699afc	471	if (option_mirror \|\| !option_bare) {
8434c2f1	472	/* Configure the remote */
689f0396 DB	473	strbuf_addf(&key, "remote.%s.fetch", option_origin);
	474	git_config_set_multivar(key.buf, value.buf, "^$", 0);
	475	strbuf_reset(&key);
	476
bc699afc	477	if (option_mirror) {
b5ff37ac MV	478	strbuf_addf(&key, "remote.%s.mirror", option_origin);
	479	git_config_set(key.buf, "true");
	480	strbuf_reset(&key);
bc699afc JS	481	}
bc699afc JS	482
b5ff37ac MV	483	strbuf_addf(&key, "remote.%s.url", option_origin);
b5ff37ac MV	484	git_config_set(key.buf, repo);
b5ff37ac	485	strbuf_reset(&key);
8434c2f1 DB	486	}
8434c2f1 DB	487
689f0396 DB	488	fetch_pattern = value.buf;
	489	refspec = parse_fetch_refspec(1, &fetch_pattern);
	490
	491	strbuf_reset(&value);
8434c2f1 DB	492
	493	if (path && !is_bundle)
	494	refs = clone_local(path, git_dir);
	495	else {
	496	struct remote *remote = remote_get(argv[0]);
1db4a75c	497	transport = transport_get(remote, remote->url[0]);
8434c2f1	498
37b78c25 JK	499	if (!transport->get_refs_list \|\| !transport->fetch)
	500	die("Don't know how to clone %s", transport->url);
	501
8434c2f1 DB	502	transport_set_option(transport, TRANS_OPT_KEEP, "yes");
	503
	504	if (option_depth)
	505	transport_set_option(transport, TRANS_OPT_DEPTH,
	506	option_depth);
	507
	508	if (option_quiet)
	509	transport->verbose = -1;
21188b1e MV	510	else if (option_verbose)
21188b1e MV	511	transport->progress = 1;
8434c2f1	512
837c8767 SH	513	if (option_upload_pack)
	514	transport_set_option(transport, TRANS_OPT_UPLOADPACK,
	515	option_upload_pack);
	516
8434c2f1	517	refs = transport_get_remote_refs(transport);
eeefa7c9	518	if (refs)
86ac7518	519	transport_fetch_refs(transport, refs);
8434c2f1 DB	520	}
8434c2f1 DB	521
86ac7518 SR	522	if (refs) {
86ac7518 SR	523	clear_extra_refs();
8434c2f1	524
689f0396	525	mapped_refs = write_remote_refs(refs, refspec, reflog_msg.buf);
8434c2f1	526
6cb4e6cc	527	remote_head = find_ref_by_name(refs, "HEAD");
4229f1fa	528	head_points_at = guess_remote_head(remote_head, mapped_refs, 0);
86ac7518 SR	529	}
	530	else {
	531	warning("You appear to have cloned an empty repository.");
	532	head_points_at = NULL;
	533	remote_head = NULL;
	534	option_no_checkout = 1;
5cd12b85	535	if (!option_bare)
a9f2c136	536	install_branch_config(0, "master", option_origin,
5cd12b85	537	"refs/heads/master");
86ac7518	538	}
8434c2f1 DB	539
	540	if (head_points_at) {
	541	/* Local default branch link */
	542	create_symref("HEAD", head_points_at->name, NULL);
	543
	544	if (!option_bare) {
f285a2d7	545	struct strbuf head_ref = STRBUF_INIT;
8434c2f1 DB	546	const char *head = head_points_at->name;
	547
	548	if (!prefixcmp(head, "refs/heads/"))
	549	head += 11;
	550
	551	/* Set up the initial local branch */
	552
	553	/* Local branch initial value */
	554	update_ref(reflog_msg.buf, "HEAD",
	555	head_points_at->old_sha1,
	556	NULL, 0, DIE_ON_ERR);
	557
b5ff37ac	558	strbuf_addstr(&head_ref, branch_top.buf);
8434c2f1 DB	559	strbuf_addstr(&head_ref, "HEAD");
	560
	561	/* Remote branch link */
	562	create_symref(head_ref.buf,
	563	head_points_at->peer_ref->name,
	564	reflog_msg.buf);
	565
a9f2c136	566	install_branch_config(0, head, option_origin,
5cd12b85	567	head_points_at->name);
8434c2f1 DB	568	}
	569	} else if (remote_head) {
	570	/* Source had detached HEAD pointing somewhere. */
	571	if (!option_bare)
	572	update_ref(reflog_msg.buf, "HEAD",
	573	remote_head->old_sha1,
	574	NULL, REF_NODEREF, DIE_ON_ERR);
	575	} else {
	576	/* Nothing to checkout out */
	577	if (!option_no_checkout)
	578	warning("remote HEAD refers to nonexistent ref, "
	579	"unable to checkout.\n");
	580	option_no_checkout = 1;
	581	}
	582
1db4a75c SP	583	if (transport)
	584	transport_unlock_pack(transport);
	585
8434c2f1 DB	586	if (!option_no_checkout) {
	587	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
	588	struct unpack_trees_options opts;
	589	struct tree *tree;
	590	struct tree_desc t;
	591	int fd;
	592
	593	/* We need to be in the new work tree for the checkout */
	594	setup_work_tree();
	595
	596	fd = hold_locked_index(lock_file, 1);
	597
	598	memset(&opts, 0, sizeof opts);
	599	opts.update = 1;
a73bc127 JS	600	opts.merge = 1;
a73bc127 JS	601	opts.fn = oneway_merge;
8434c2f1	602	opts.verbose_update = !option_quiet;
a73bc127	603	opts.src_index = &the_index;
8434c2f1 DB	604	opts.dst_index = &the_index;
	605
	606	tree = parse_tree_indirect(remote_head->old_sha1);
	607	parse_tree(tree);
	608	init_tree_desc(&t, tree->buffer, tree->size);
	609	unpack_trees(1, &t, &opts);
	610
	611	if (write_cache(fd, active_cache, active_nr) \|\|
	612	commit_locked_index(lock_file))
	613	die("unable to write new index file");
dfa7a6c5 JK	614
	615	err \|= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
	616	sha1_to_hex(remote_head->old_sha1), "1", NULL);
e7fed18a JH	617
	618	if (!err && option_recursive)
	619	err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
8434c2f1 DB	620	}
	621
	622	strbuf_release(&reflog_msg);
b5ff37ac MV	623	strbuf_release(&branch_top);
	624	strbuf_release(&key);
	625	strbuf_release(&value);
8434c2f1	626	junk_pid = 0;
dfa7a6c5	627	return err;
8434c2f1	628	}