chore(3p/git): Unvendor git and track patches instead r/2903

This was vendored a long time ago under the expectation that keeping
it in sync with cgit would be easier this way, but it has proven not
to be a big issue.

On the other hand, a vendored copy of git is an annoying maintenance
burden. It is much easier to rebase the single (dottime) patch that we
have.

This removes the vendored copy of git and instead passes the git
source code to cgit via `pkgs.srcOnly`, which includes the applied
patch so that cgit can continue rendering dottime.

Change-Id: If31f62dea7ce688fd1b9050204e9378019775f2b

1 files changed, 0 insertions, 1337 deletions

diff --git a/third_party/git/builtin/clone.c b/third_party/git/builtin/clone.c
deleted file mode 100644
index 391aa41075ee..000000000000
--- a/third_party/git/builtin/clone.c
+++ /dev/null
@@ -1,1337 +0,0 @@
-/*
- * 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.
- */
-
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
-#include "builtin.h"
-#include "config.h"
-#include "lockfile.h"
-#include "parse-options.h"
-#include "fetch-pack.h"
-#include "refs.h"
-#include "refspec.h"
-#include "object-store.h"
-#include "tree.h"
-#include "tree-walk.h"
-#include "unpack-trees.h"
-#include "transport.h"
-#include "strbuf.h"
-#include "dir.h"
-#include "dir-iterator.h"
-#include "iterator.h"
-#include "sigchain.h"
-#include "branch.h"
-#include "remote.h"
-#include "run-command.h"
-#include "connected.h"
-#include "packfile.h"
-#include "list-objects-filter-options.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[] = {
-	N_("git clone [<options>] [--] <repo> [<dir>]"),
-	NULL
-};
-
-static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
-static int option_local = -1, option_no_hardlinks, option_shared;
-static int option_no_tags;
-static int option_shallow_submodules;
-static int deepen;
-static char *option_template, *option_depth, *option_since;
-static char *option_origin = NULL;
-static char *option_branch = NULL;
-static struct string_list option_not = STRING_LIST_INIT_NODUP;
-static const char *real_git_dir;
-static char *option_upload_pack = "git-upload-pack";
-static int option_verbosity;
-static int option_progress = -1;
-static int option_sparse_checkout;
-static enum transport_family family;
-static struct string_list option_config = STRING_LIST_INIT_NODUP;
-static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
-static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
-static int option_dissociate;
-static int max_jobs = -1;
-static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
-static struct list_objects_filter_options filter_options;
-static struct string_list server_options = STRING_LIST_INIT_NODUP;
-static int option_remote_submodules;
-
-static int recurse_submodules_cb(const struct option *opt,
-				 const char *arg, int unset)
-{
-	if (unset)
-		string_list_clear((struct string_list *)opt->value, 0);
-	else if (arg)
-		string_list_append((struct string_list *)opt->value, arg);
-	else
-		string_list_append((struct string_list *)opt->value,
-				   (const char *)opt->defval);
-
-	return 0;
-}
-
-static struct option builtin_clone_options[] = {
-	OPT__VERBOSITY(&option_verbosity),
-	OPT_BOOL(0, "progress", &option_progress,
-		 N_("force progress reporting")),
-	OPT_BOOL('n', "no-checkout", &option_no_checkout,
-		 N_("don't create a checkout")),
-	OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
-	OPT_HIDDEN_BOOL(0, "naked", &option_bare,
-			N_("create a bare repository")),
-	OPT_BOOL(0, "mirror", &option_mirror,
-		 N_("create a mirror repository (implies bare)")),
-	OPT_BOOL('l', "local", &option_local,
-		N_("to clone from a local repository")),
-	OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
-		    N_("don't use local hardlinks, always copy")),
-	OPT_BOOL('s', "shared", &option_shared,
-		    N_("setup as shared repository")),
-	{ OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
-	  N_("pathspec"), N_("initialize submodules in the clone"),
-	  PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
-	OPT_ALIAS(0, "recursive", "recurse-submodules"),
-	OPT_INTEGER('j', "jobs", &max_jobs,
-		    N_("number of submodules cloned in parallel")),
-	OPT_STRING(0, "template", &option_template, N_("template-directory"),
-		   N_("directory from which templates will be used")),
-	OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
-			N_("reference repository")),
-	OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
-			N_("repo"), N_("reference repository")),
-	OPT_BOOL(0, "dissociate", &option_dissociate,
-		 N_("use --reference only while cloning")),
-	OPT_STRING('o', "origin", &option_origin, N_("name"),
-		   N_("use <name> instead of 'origin' to track upstream")),
-	OPT_STRING('b', "branch", &option_branch, N_("branch"),
-		   N_("checkout <branch> instead of the remote's HEAD")),
-	OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
-		   N_("path to git-upload-pack on the remote")),
-	OPT_STRING(0, "depth", &option_depth, N_("depth"),
-		    N_("create a shallow clone of that depth")),
-	OPT_STRING(0, "shallow-since", &option_since, N_("time"),
-		    N_("create a shallow clone since a specific time")),
-	OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
-			N_("deepen history of shallow clone, excluding rev")),
-	OPT_BOOL(0, "single-branch", &option_single_branch,
-		    N_("clone only one branch, HEAD or --branch")),
-	OPT_BOOL(0, "no-tags", &option_no_tags,
-		 N_("don't clone any tags, and make later fetches not to follow them")),
-	OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
-		    N_("any cloned submodules will be shallow")),
-	OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
-		   N_("separate git dir from working tree")),
-	OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
-			N_("set config inside the new repository")),
-	OPT_STRING_LIST(0, "server-option", &server_options,
-			N_("server-specific"), N_("option to transmit")),
-	OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
-			TRANSPORT_FAMILY_IPV4),
-	OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
-			TRANSPORT_FAMILY_IPV6),
-	OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
-	OPT_BOOL(0, "remote-submodules", &option_remote_submodules,
-		    N_("any cloned submodules will use their remote-tracking branch")),
-	OPT_BOOL(0, "sparse", &option_sparse_checkout,
-		    N_("initialize sparse-checkout file to include only files at root")),
-	OPT_END()
-};
-
-static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
-{
-	static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
-	static char *bundle_suffix[] = { ".bundle", "" };
-	size_t baselen = path->len;
-	struct stat st;
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(suffix); i++) {
-		strbuf_setlen(path, baselen);
-		strbuf_addstr(path, suffix[i]);
-		if (stat(path->buf, &st))
-			continue;
-		if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
-			*is_bundle = 0;
-			return path->buf;
-		} else if (S_ISREG(st.st_mode) && st.st_size > 8) {
-			/* Is it a "gitfile"? */
-			char signature[8];
-			const char *dst;
-			int len, fd = open(path->buf, O_RDONLY);
-			if (fd < 0)
-				continue;
-			len = read_in_full(fd, signature, 8);
-			close(fd);
-			if (len != 8 || strncmp(signature, "gitdir: ", 8))
-				continue;
-			dst = read_gitfile(path->buf);
-			if (dst) {
-				*is_bundle = 0;
-				return dst;
-			}
-		}
-	}
-
-	for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
-		strbuf_setlen(path, baselen);
-		strbuf_addstr(path, bundle_suffix[i]);
-		if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
-			*is_bundle = 1;
-			return path->buf;
-		}
-	}
-
-	return NULL;
-}
-
-static char *get_repo_path(const char *repo, int *is_bundle)
-{
-	struct strbuf path = STRBUF_INIT;
-	const char *raw;
-	char *canon;
-
-	strbuf_addstr(&path, repo);
-	raw = get_repo_path_1(&path, is_bundle);
-	canon = raw ? absolute_pathdup(raw) : NULL;
-	strbuf_release(&path);
-	return canon;
-}
-
-static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
-{
-	const char *end = repo + strlen(repo), *start, *ptr;
-	size_t len;
-	char *dir;
-
-	/*
-	 * Skip scheme.
-	 */
-	start = strstr(repo, "://");
-	if (start == NULL)
-		start = repo;
-	else
-		start += 3;
-
-	/*
-	 * Skip authentication data. The stripping does happen
-	 * greedily, such that we strip up to the last '@' inside
-	 * the host part.
-	 */
-	for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
-		if (*ptr == '@')
-			start = ptr + 1;
-	}
-
-	/*
-	 * Strip trailing spaces, slashes and /.git
-	 */
-	while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
-		end--;
-	if (end - start > 5 && is_dir_sep(end[-5]) &&
-	    !strncmp(end - 4, ".git", 4)) {
-		end -= 5;
-		while (start < end && is_dir_sep(end[-1]))
-			end--;
-	}
-
-	/*
-	 * Strip trailing port number if we've got only a
-	 * hostname (that is, there is no dir separator but a
-	 * colon). This check is required such that we do not
-	 * strip URI's like '/foo/bar:2222.git', which should
-	 * result in a dir '2222' being guessed due to backwards
-	 * compatibility.
-	 */
-	if (memchr(start, '/', end - start) == NULL
-	    && memchr(start, ':', end - start) != NULL) {
-		ptr = end;
-		while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
-			ptr--;
-		if (start < ptr && ptr[-1] == ':')
-			end = ptr - 1;
-	}
-
-	/*
-	 * Find last component. To remain backwards compatible we
-	 * also regard colons as path separators, such that
-	 * cloning a repository 'foo:bar.git' would result in a
-	 * directory 'bar' being guessed.
-	 */
-	ptr = end;
-	while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
-		ptr--;
-	start = ptr;
-
-	/*
-	 * Strip .{bundle,git}.
-	 */
-	len = end - start;
-	strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
-
-	if (!len || (len == 1 && *start == '/'))
-		die(_("No directory name could be guessed.\n"
-		      "Please specify a directory on the command line"));
-
-	if (is_bare)
-		dir = xstrfmt("%.*s.git", (int)len, start);
-	else
-		dir = xstrndup(start, len);
-	/*
-	 * 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 int add_one_reference(struct string_list_item *item, void *cb_data)
-{
-	struct strbuf err = STRBUF_INIT;
-	int *required = cb_data;
-	char *ref_git = compute_alternate_path(item->string, &err);
-
-	if (!ref_git) {
-		if (*required)
-			die("%s", err.buf);
-		else
-			fprintf(stderr,
-				_("info: Could not add alternate for '%s': %s\n"),
-				item->string, err.buf);
-	} else {
-		struct strbuf sb = STRBUF_INIT;
-		strbuf_addf(&sb, "%s/objects", ref_git);
-		add_to_alternates_file(sb.buf);
-		strbuf_release(&sb);
-	}
-
-	strbuf_release(&err);
-	free(ref_git);
-	return 0;
-}
-
-static void setup_reference(void)
-{
-	int required = 1;
-	for_each_string_list(&option_required_reference,
-			     add_one_reference, &required);
-	required = 0;
-	for_each_string_list(&option_optional_reference,
-			     add_one_reference, &required);
-}
-
-static void copy_alternates(struct strbuf *src, const char *src_repo)
-{
-	/*
-	 * Read from the source objects/info/alternates file
-	 * and copy the entries to corresponding file in the
-	 * destination repository with add_to_alternates_file().
-	 * Both src and dst have "$path/objects/info/alternates".
-	 *
-	 * Instead of copying bit-for-bit from the original,
-	 * we need to append to existing one so that the already
-	 * created entry via "clone -s" is not lost, and also
-	 * to turn entries with paths relative to the original
-	 * absolute, so that they can be used in the new repository.
-	 */
-	FILE *in = xfopen(src->buf, "r");
-	struct strbuf line = STRBUF_INIT;
-
-	while (strbuf_getline(&line, in) != EOF) {
-		char *abs_path;
-		if (!line.len || line.buf[0] == '#')
-			continue;
-		if (is_absolute_path(line.buf)) {
-			add_to_alternates_file(line.buf);
-			continue;
-		}
-		abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
-		if (!normalize_path_copy(abs_path, abs_path))
-			add_to_alternates_file(abs_path);
-		else
-			warning("skipping invalid relative alternate: %s/%s",
-				src_repo, line.buf);
-		free(abs_path);
-	}
-	strbuf_release(&line);
-	fclose(in);
-}
-
-static void mkdir_if_missing(const char *pathname, mode_t mode)
-{
-	struct stat st;
-
-	if (!mkdir(pathname, mode))
-		return;
-
-	if (errno != EEXIST)
-		die_errno(_("failed to create directory '%s'"), pathname);
-	else if (stat(pathname, &st))
-		die_errno(_("failed to stat '%s'"), pathname);
-	else if (!S_ISDIR(st.st_mode))
-		die(_("%s exists and is not a directory"), pathname);
-}
-
-static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
-				   const char *src_repo)
-{
-	int src_len, dest_len;
-	struct dir_iterator *iter;
-	int iter_status;
-	unsigned int flags;
-	struct strbuf realpath = STRBUF_INIT;
-
-	mkdir_if_missing(dest->buf, 0777);
-
-	flags = DIR_ITERATOR_PEDANTIC | DIR_ITERATOR_FOLLOW_SYMLINKS;
-	iter = dir_iterator_begin(src->buf, flags);
-
-	if (!iter)
-		die_errno(_("failed to start iterator over '%s'"), src->buf);
-
-	strbuf_addch(src, '/');
-	src_len = src->len;
-	strbuf_addch(dest, '/');
-	dest_len = dest->len;
-
-	while ((iter_status = dir_iterator_advance(iter)) == ITER_OK) {
-		strbuf_setlen(src, src_len);
-		strbuf_addstr(src, iter->relative_path);
-		strbuf_setlen(dest, dest_len);
-		strbuf_addstr(dest, iter->relative_path);
-
-		if (S_ISDIR(iter->st.st_mode)) {
-			mkdir_if_missing(dest->buf, 0777);
-			continue;
-		}
-
-		/* Files that cannot be copied bit-for-bit... */
-		if (!fspathcmp(iter->relative_path, "info/alternates")) {
-			copy_alternates(src, src_repo);
-			continue;
-		}
-
-		if (unlink(dest->buf) && errno != ENOENT)
-			die_errno(_("failed to unlink '%s'"), dest->buf);
-		if (!option_no_hardlinks) {
-			strbuf_realpath(&realpath, src->buf, 1);
-			if (!link(realpath.buf, dest->buf))
-				continue;
-			if (option_local > 0)
-				die_errno(_("failed to create link '%s'"), dest->buf);
-			option_no_hardlinks = 1;
-		}
-		if (copy_file_with_time(dest->buf, src->buf, 0666))
-			die_errno(_("failed to copy file to '%s'"), dest->buf);
-	}
-
-	if (iter_status != ITER_DONE) {
-		strbuf_setlen(src, src_len);
-		die(_("failed to iterate over '%s'"), src->buf);
-	}
-
-	strbuf_release(&realpath);
-}
-
-static void clone_local(const char *src_repo, const char *dest_repo)
-{
-	if (option_shared) {
-		struct strbuf alt = STRBUF_INIT;
-		get_common_dir(&alt, src_repo);
-		strbuf_addstr(&alt, "/objects");
-		add_to_alternates_file(alt.buf);
-		strbuf_release(&alt);
-	} else {
-		struct strbuf src = STRBUF_INIT;
-		struct strbuf dest = STRBUF_INIT;
-		get_common_dir(&src, src_repo);
-		get_common_dir(&dest, dest_repo);
-		strbuf_addstr(&src, "/objects");
-		strbuf_addstr(&dest, "/objects");
-		copy_or_link_directory(&src, &dest, src_repo);
-		strbuf_release(&src);
-		strbuf_release(&dest);
-	}
-
-	if (0 <= option_verbosity)
-		fprintf(stderr, _("done.\n"));
-}
-
-static const char *junk_work_tree;
-static int junk_work_tree_flags;
-static const char *junk_git_dir;
-static int junk_git_dir_flags;
-static enum {
-	JUNK_LEAVE_NONE,
-	JUNK_LEAVE_REPO,
-	JUNK_LEAVE_ALL
-} junk_mode = JUNK_LEAVE_NONE;
-
-static const char junk_leave_repo_msg[] =
-N_("Clone succeeded, but checkout failed.\n"
-   "You can inspect what was checked out with 'git status'\n"
-   "and retry with 'git restore --source=HEAD :/'\n");
-
-static void remove_junk(void)
-{
-	struct strbuf sb = STRBUF_INIT;
-
-	switch (junk_mode) {
-	case JUNK_LEAVE_REPO:
-		warning("%s", _(junk_leave_repo_msg));
-		/* fall-through */
-	case JUNK_LEAVE_ALL:
-		return;
-	default:
-		/* proceed to removal */
-		break;
-	}
-
-	if (junk_git_dir) {
-		strbuf_addstr(&sb, junk_git_dir);
-		remove_dir_recursively(&sb, junk_git_dir_flags);
-		strbuf_reset(&sb);
-	}
-	if (junk_work_tree) {
-		strbuf_addstr(&sb, junk_work_tree);
-		remove_dir_recursively(&sb, junk_work_tree_flags);
-	}
-	strbuf_release(&sb);
-}
-
-static void remove_junk_on_signal(int signo)
-{
-	remove_junk();
-	sigchain_pop(signo);
-	raise(signo);
-}
-
-static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
-{
-	struct ref *ref;
-	struct strbuf head = STRBUF_INIT;
-	strbuf_addstr(&head, "refs/heads/");
-	strbuf_addstr(&head, branch);
-	ref = find_ref_by_name(refs, head.buf);
-	strbuf_release(&head);
-
-	if (ref)
-		return ref;
-
-	strbuf_addstr(&head, "refs/tags/");
-	strbuf_addstr(&head, branch);
-	ref = find_ref_by_name(refs, head.buf);
-	strbuf_release(&head);
-
-	return ref;
-}
-
-static struct ref *wanted_peer_refs(const struct ref *refs,
-		struct refspec *refspec)
-{
-	struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
-	struct ref *local_refs = head;
-	struct ref **tail = head ? &head->next : &local_refs;
-
-	if (option_single_branch) {
-		struct ref *remote_head = NULL;
-
-		if (!option_branch)
-			remote_head = guess_remote_head(head, refs, 0);
-		else {
-			local_refs = NULL;
-			tail = &local_refs;
-			remote_head = copy_ref(find_remote_branch(refs, option_branch));
-		}
-
-		if (!remote_head && option_branch)
-			warning(_("Could not find remote branch %s to clone."),
-				option_branch);
-		else {
-			int i;
-			for (i = 0; i < refspec->nr; i++)
-				get_fetch_map(remote_head, &refspec->items[i],
-					      &tail, 0);
-
-			/* if --branch=tag, pull the requested tag explicitly */
-			get_fetch_map(remote_head, tag_refspec, &tail, 0);
-		}
-	} else {
-		int i;
-		for (i = 0; i < refspec->nr; i++)
-			get_fetch_map(refs, &refspec->items[i], &tail, 0);
-	}
-
-	if (!option_mirror && !option_single_branch && !option_no_tags)
-		get_fetch_map(refs, tag_refspec, &tail, 0);
-
-	return local_refs;
-}
-
-static void write_remote_refs(const struct ref *local_refs)
-{
-	const struct ref *r;
-
-	struct ref_transaction *t;
-	struct strbuf err = STRBUF_INIT;
-
-	t = ref_transaction_begin(&err);
-	if (!t)
-		die("%s", err.buf);
-
-	for (r = local_refs; r; r = r->next) {
-		if (!r->peer_ref)
-			continue;
-		if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
-					   0, NULL, &err))
-			die("%s", err.buf);
-	}
-
-	if (initial_ref_transaction_commit(t, &err))
-		die("%s", err.buf);
-
-	strbuf_release(&err);
-	ref_transaction_free(t);
-}
-
-static void write_followtags(const struct ref *refs, const char *msg)
-{
-	const struct ref *ref;
-	for (ref = refs; ref; ref = ref->next) {
-		if (!starts_with(ref->name, "refs/tags/"))
-			continue;
-		if (ends_with(ref->name, "^{}"))
-			continue;
-		if (!has_object_file_with_flags(&ref->old_oid,
-						OBJECT_INFO_QUICK |
-						OBJECT_INFO_SKIP_FETCH_OBJECT))
-			continue;
-		update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
-			   UPDATE_REFS_DIE_ON_ERR);
-	}
-}
-
-static int iterate_ref_map(void *cb_data, struct object_id *oid)
-{
-	struct ref **rm = cb_data;
-	struct ref *ref = *rm;
-
-	/*
-	 * Skip anything missing a peer_ref, which we are not
-	 * actually going to write a ref for.
-	 */
-	while (ref && !ref->peer_ref)
-		ref = ref->next;
-	/* Returning -1 notes "end of list" to the caller. */
-	if (!ref)
-		return -1;
-
-	oidcpy(oid, &ref->old_oid);
-	*rm = ref->next;
-	return 0;
-}
-
-static void update_remote_refs(const struct ref *refs,
-			       const struct ref *mapped_refs,
-			       const struct ref *remote_head_points_at,
-			       const char *branch_top,
-			       const char *msg,
-			       struct transport *transport,
-			       int check_connectivity)
-{
-	const struct ref *rm = mapped_refs;
-
-	if (check_connectivity) {
-		struct check_connected_options opt = CHECK_CONNECTED_INIT;
-
-		opt.transport = transport;
-		opt.progress = transport->progress;
-
-		if (check_connected(iterate_ref_map, &rm, &opt))
-			die(_("remote did not send all necessary objects"));
-	}
-
-	if (refs) {
-		write_remote_refs(mapped_refs);
-		if (option_single_branch && !option_no_tags)
-			write_followtags(refs, msg);
-	}
-
-	if (remote_head_points_at && !option_bare) {
-		struct strbuf head_ref = STRBUF_INIT;
-		strbuf_addstr(&head_ref, branch_top);
-		strbuf_addstr(&head_ref, "HEAD");
-		if (create_symref(head_ref.buf,
-				  remote_head_points_at->peer_ref->name,
-				  msg) < 0)
-			die(_("unable to update %s"), head_ref.buf);
-		strbuf_release(&head_ref);
-	}
-}
-
-static void update_head(const struct ref *our, const struct ref *remote,
-			const char *msg)
-{
-	const char *head;
-	if (our && skip_prefix(our->name, "refs/heads/", &head)) {
-		/* Local default branch link */
-		if (create_symref("HEAD", our->name, NULL) < 0)
-			die(_("unable to update HEAD"));
-		if (!option_bare) {
-			update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
-				   UPDATE_REFS_DIE_ON_ERR);
-			install_branch_config(0, head, option_origin, our->name);
-		}
-	} else if (our) {
-		struct commit *c = lookup_commit_reference(the_repository,
-							   &our->old_oid);
-		/* --branch specifies a non-branch (i.e. tags), detach HEAD */
-		update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
-			   UPDATE_REFS_DIE_ON_ERR);
-	} else if (remote) {
-		/*
-		 * We know remote HEAD points to a non-branch, or
-		 * HEAD points to a branch but we don't know which one.
-		 * Detach HEAD in all these cases.
-		 */
-		update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
-			   UPDATE_REFS_DIE_ON_ERR);
-	}
-}
-
-static int git_sparse_checkout_init(const char *repo)
-{
-	struct strvec argv = STRVEC_INIT;
-	int result = 0;
-	strvec_pushl(&argv, "-C", repo, "sparse-checkout", "init", NULL);
-
-	/*
-	 * We must apply the setting in the current process
-	 * for the later checkout to use the sparse-checkout file.
-	 */
-	core_apply_sparse_checkout = 1;
-
-	if (run_command_v_opt(argv.v, RUN_GIT_CMD)) {
-		error(_("failed to initialize sparse-checkout"));
-		result = 1;
-	}
-
-	strvec_clear(&argv);
-	return result;
-}
-
-static int checkout(int submodule_progress)
-{
-	struct object_id oid;
-	char *head;
-	struct lock_file lock_file = LOCK_INIT;
-	struct unpack_trees_options opts;
-	struct tree *tree;
-	struct tree_desc t;
-	int err = 0;
-
-	if (option_no_checkout)
-		return 0;
-
-	head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
-	if (!head) {
-		warning(_("remote HEAD refers to nonexistent ref, "
-			  "unable to checkout.\n"));
-		return 0;
-	}
-	if (!strcmp(head, "HEAD")) {
-		if (advice_detached_head)
-			detach_advice(oid_to_hex(&oid));
-		FREE_AND_NULL(head);
-	} else {
-		if (!starts_with(head, "refs/heads/"))
-			die(_("HEAD not found below refs/heads!"));
-	}
-
-	/* We need to be in the new work tree for the checkout */
-	setup_work_tree();
-
-	hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
-
-	memset(&opts, 0, sizeof opts);
-	opts.update = 1;
-	opts.merge = 1;
-	opts.clone = 1;
-	opts.fn = oneway_merge;
-	opts.verbose_update = (option_verbosity >= 0);
-	opts.src_index = &the_index;
-	opts.dst_index = &the_index;
-	init_checkout_metadata(&opts.meta, head, &oid, NULL);
-
-	tree = parse_tree_indirect(&oid);
-	parse_tree(tree);
-	init_tree_desc(&t, tree->buffer, tree->size);
-	if (unpack_trees(1, &t, &opts) < 0)
-		die(_("unable to checkout working tree"));
-
-	free(head);
-
-	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
-		die(_("unable to write new index file"));
-
-	err |= run_hook_le(NULL, "post-checkout", oid_to_hex(&null_oid),
-			   oid_to_hex(&oid), "1", NULL);
-
-	if (!err && (option_recurse_submodules.nr > 0)) {
-		struct strvec args = STRVEC_INIT;
-		strvec_pushl(&args, "submodule", "update", "--require-init", "--recursive", NULL);
-
-		if (option_shallow_submodules == 1)
-			strvec_push(&args, "--depth=1");
-
-		if (max_jobs != -1)
-			strvec_pushf(&args, "--jobs=%d", max_jobs);
-
-		if (submodule_progress)
-			strvec_push(&args, "--progress");
-
-		if (option_verbosity < 0)
-			strvec_push(&args, "--quiet");
-
-		if (option_remote_submodules) {
-			strvec_push(&args, "--remote");
-			strvec_push(&args, "--no-fetch");
-		}
-
-		if (option_single_branch >= 0)
-			strvec_push(&args, option_single_branch ?
-					       "--single-branch" :
-					       "--no-single-branch");
-
-		err = run_command_v_opt(args.v, RUN_GIT_CMD);
-		strvec_clear(&args);
-	}
-
-	return err;
-}
-
-static int write_one_config(const char *key, const char *value, void *data)
-{
-	return git_config_set_multivar_gently(key,
-					      value ? value : "true",
-					      CONFIG_REGEX_NONE, 0);
-}
-
-static void write_config(struct string_list *config)
-{
-	int i;
-
-	for (i = 0; i < config->nr; i++) {
-		if (git_config_parse_parameter(config->items[i].string,
-					       write_one_config, NULL) < 0)
-			die(_("unable to write parameters to config file"));
-	}
-}
-
-static void write_refspec_config(const char *src_ref_prefix,
-		const struct ref *our_head_points_at,
-		const struct ref *remote_head_points_at,
-		struct strbuf *branch_top)
-{
-	struct strbuf key = STRBUF_INIT;
-	struct strbuf value = STRBUF_INIT;
-
-	if (option_mirror || !option_bare) {
-		if (option_single_branch && !option_mirror) {
-			if (option_branch) {
-				if (starts_with(our_head_points_at->name, "refs/tags/"))
-					strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
-						our_head_points_at->name);
-				else
-					strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
-						branch_top->buf, option_branch);
-			} else if (remote_head_points_at) {
-				const char *head = remote_head_points_at->name;
-				if (!skip_prefix(head, "refs/heads/", &head))
-					BUG("remote HEAD points at non-head?");
-
-				strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
-						branch_top->buf, head);
-			}
-			/*
-			 * otherwise, the next "git fetch" will
-			 * simply fetch from HEAD without updating
-			 * any remote-tracking branch, which is what
-			 * we want.
-			 */
-		} else {
-			strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
-		}
-		/* Configure the remote */
-		if (value.len) {
-			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_release(&key);
-	strbuf_release(&value);
-}
-
-static void dissociate_from_references(void)
-{
-	static const char* argv[] = { "repack", "-a", "-d", NULL };
-	char *alternates = git_pathdup("objects/info/alternates");
-
-	if (!access(alternates, F_OK)) {
-		if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
-			die(_("cannot repack to clean up"));
-		if (unlink(alternates) && errno != ENOENT)
-			die_errno(_("cannot unlink temporary alternates file"));
-	}
-	free(alternates);
-}
-
-static int path_exists(const char *path)
-{
-	struct stat sb;
-	return !stat(path, &sb);
-}
-
-int cmd_clone(int argc, const char **argv, const char *prefix)
-{
-	int is_bundle = 0, is_local;
-	const char *repo_name, *repo, *work_tree, *git_dir;
-	char *path, *dir, *display_repo = NULL;
-	int dest_exists, real_dest_exists = 0;
-	const struct ref *refs, *remote_head;
-	const struct ref *remote_head_points_at;
-	const struct ref *our_head_points_at;
-	struct ref *mapped_refs;
-	const struct ref *ref;
-	struct strbuf key = STRBUF_INIT;
-	struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
-	struct transport *transport = NULL;
-	const char *src_ref_prefix = "refs/heads/";
-	struct remote *remote;
-	int err = 0, complete_refs_before_fetch = 1;
-	int submodule_progress;
-
-	struct strvec ref_prefixes = STRVEC_INIT;
-
-	packet_trace_identity("clone");
-	argc = parse_options(argc, argv, prefix, builtin_clone_options,
-			     builtin_clone_usage, 0);
-
-	if (argc > 2)
-		usage_msg_opt(_("Too many arguments."),
-			builtin_clone_usage, builtin_clone_options);
-
-	if (argc == 0)
-		usage_msg_opt(_("You must specify a repository to clone."),
-			builtin_clone_usage, builtin_clone_options);
-
-	if (option_depth || option_since || option_not.nr)
-		deepen = 1;
-	if (option_single_branch == -1)
-		option_single_branch = deepen ? 1 : 0;
-
-	if (option_mirror)
-		option_bare = 1;
-
-	if (option_bare) {
-		if (option_origin)
-			die(_("--bare and --origin %s options are incompatible."),
-			    option_origin);
-		if (real_git_dir)
-			die(_("--bare and --separate-git-dir are incompatible."));
-		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 = absolute_pathdup(repo_name);
-	else if (strchr(repo_name, ':')) {
-		repo = repo_name;
-		display_repo = transport_anonymize_url(repo);
-	} else
-		die(_("repository '%s' does not exist"), repo_name);
-
-	/* no need to be strict, transport_set_option() will validate it again */
-	if (option_depth && atoi(option_depth) < 1)
-		die(_("depth %s is not a positive number"), option_depth);
-
-	if (argc == 2)
-		dir = xstrdup(argv[1]);
-	else
-		dir = guess_dir_name(repo_name, is_bundle, option_bare);
-	strip_trailing_slashes(dir);
-
-	dest_exists = path_exists(dir);
-	if (dest_exists && !is_empty_dir(dir))
-		die(_("destination path '%s' already exists and is not "
-			"an empty directory."), dir);
-
-	if (real_git_dir) {
-		real_dest_exists = path_exists(real_git_dir);
-		if (real_dest_exists && !is_empty_dir(real_git_dir))
-			die(_("repository path '%s' already exists and is not "
-				"an empty directory."), real_git_dir);
-	}
-
-
-	strbuf_addf(&reflog_msg, "clone: from %s",
-		    display_repo ? display_repo : repo);
-	free(display_repo);
-
-	if (option_bare)
-		work_tree = NULL;
-	else {
-		work_tree = getenv("GIT_WORK_TREE");
-		if (work_tree && path_exists(work_tree))
-			die(_("working tree '%s' already exists."), work_tree);
-	}
-
-	if (option_bare || work_tree)
-		git_dir = xstrdup(dir);
-	else {
-		work_tree = dir;
-		git_dir = mkpathdup("%s/.git", dir);
-	}
-
-	atexit(remove_junk);
-	sigchain_push_common(remove_junk_on_signal);
-
-	if (!option_bare) {
-		if (safe_create_leading_directories_const(work_tree) < 0)
-			die_errno(_("could not create leading directories of '%s'"),
-				  work_tree);
-		if (dest_exists)
-			junk_work_tree_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
-		else if (mkdir(work_tree, 0777))
-			die_errno(_("could not create work tree dir '%s'"),
-				  work_tree);
-		junk_work_tree = work_tree;
-		set_git_work_tree(work_tree);
-	}
-
-	if (real_git_dir) {
-		if (real_dest_exists)
-			junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
-		junk_git_dir = real_git_dir;
-	} else {
-		if (dest_exists)
-			junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
-		junk_git_dir = git_dir;
-	}
-	if (safe_create_leading_directories_const(git_dir) < 0)
-		die(_("could not create leading directories of '%s'"), git_dir);
-
-	if (0 <= option_verbosity) {
-		if (option_bare)
-			fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
-		else
-			fprintf(stderr, _("Cloning into '%s'...\n"), dir);
-	}
-
-	if (option_recurse_submodules.nr > 0) {
-		struct string_list_item *item;
-		struct strbuf sb = STRBUF_INIT;
-
-		/* remove duplicates */
-		string_list_sort(&option_recurse_submodules);
-		string_list_remove_duplicates(&option_recurse_submodules, 0);
-
-		/*
-		 * NEEDSWORK: In a multi-working-tree world, this needs to be
-		 * set in the per-worktree config.
-		 */
-		for_each_string_list_item(item, &option_recurse_submodules) {
-			strbuf_addf(&sb, "submodule.active=%s",
-				    item->string);
-			string_list_append(&option_config,
-					   strbuf_detach(&sb, NULL));
-		}
-
-		if (option_required_reference.nr &&
-		    option_optional_reference.nr)
-			die(_("clone --recursive is not compatible with "
-			      "both --reference and --reference-if-able"));
-		else if (option_required_reference.nr) {
-			string_list_append(&option_config,
-				"submodule.alternateLocation=superproject");
-			string_list_append(&option_config,
-				"submodule.alternateErrorStrategy=die");
-		} else if (option_optional_reference.nr) {
-			string_list_append(&option_config,
-				"submodule.alternateLocation=superproject");
-			string_list_append(&option_config,
-				"submodule.alternateErrorStrategy=info");
-		}
-	}
-
-	init_db(git_dir, real_git_dir, option_template, GIT_HASH_UNKNOWN, NULL,
-		INIT_DB_QUIET);
-
-	if (real_git_dir)
-		git_dir = real_git_dir;
-
-	write_config(&option_config);
-
-	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(&key, "remote.%s.url", option_origin);
-	git_config_set(key.buf, repo);
-	strbuf_reset(&key);
-
-	if (option_no_tags) {
-		strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
-		git_config_set(key.buf, "--no-tags");
-		strbuf_reset(&key);
-	}
-
-	if (option_required_reference.nr || option_optional_reference.nr)
-		setup_reference();
-
-	if (option_sparse_checkout && git_sparse_checkout_init(dir))
-		return 1;
-
-	remote = remote_get(option_origin);
-
-	refspec_appendf(&remote->fetch, "+%s*:%s*", src_ref_prefix,
-			branch_top.buf);
-
-	transport = transport_get(remote, remote->url[0]);
-	transport_set_verbosity(transport, option_verbosity, option_progress);
-	transport->family = family;
-
-	path = get_repo_path(remote->url[0], &is_bundle);
-	is_local = option_local != 0 && path && !is_bundle;
-	if (is_local) {
-		if (option_depth)
-			warning(_("--depth is ignored in local clones; use file:// instead."));
-		if (option_since)
-			warning(_("--shallow-since is ignored in local clones; use file:// instead."));
-		if (option_not.nr)
-			warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
-		if (filter_options.choice)
-			warning(_("--filter is ignored in local clones; use file:// instead."));
-		if (!access(mkpath("%s/shallow", path), F_OK)) {
-			if (option_local > 0)
-				warning(_("source repository is shallow, ignoring --local"));
-			is_local = 0;
-		}
-	}
-	if (option_local > 0 && !is_local)
-		warning(_("--local is ignored"));
-	transport->cloning = 1;
-
-	transport_set_option(transport, TRANS_OPT_KEEP, "yes");
-
-	if (option_depth)
-		transport_set_option(transport, TRANS_OPT_DEPTH,
-				     option_depth);
-	if (option_since)
-		transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
-				     option_since);
-	if (option_not.nr)
-		transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
-				     (const char *)&option_not);
-	if (option_single_branch)
-		transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
-
-	if (option_upload_pack)
-		transport_set_option(transport, TRANS_OPT_UPLOADPACK,
-				     option_upload_pack);
-
-	if (server_options.nr)
-		transport->server_options = &server_options;
-
-	if (filter_options.choice) {
-		const char *spec =
-			expand_list_objects_filter_spec(&filter_options);
-		transport_set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
-				     spec);
-		transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
-	}
-
-	if (transport->smart_options && !deepen && !filter_options.choice)
-		transport->smart_options->check_self_contained_and_connected = 1;
-
-
-	strvec_push(&ref_prefixes, "HEAD");
-	refspec_ref_prefixes(&remote->fetch, &ref_prefixes);
-	if (option_branch)
-		expand_ref_prefix(&ref_prefixes, option_branch);
-	if (!option_no_tags)
-		strvec_push(&ref_prefixes, "refs/tags/");
-
-	refs = transport_get_remote_refs(transport, &ref_prefixes);
-
-	if (refs) {
-		int hash_algo = hash_algo_by_ptr(transport_get_hash_algo(transport));
-
-		/*
-		 * Now that we know what algorithm the remote side is using,
-		 * let's set ours to the same thing.
-		 */
-		initialize_repository_version(hash_algo, 1);
-		repo_set_hash_algo(the_repository, hash_algo);
-
-		mapped_refs = wanted_peer_refs(refs, &remote->fetch);
-		/*
-		 * transport_get_remote_refs() may return refs with null sha-1
-		 * in mapped_refs (see struct transport->get_refs_list
-		 * comment). In that case we need fetch it early because
-		 * remote_head code below relies on it.
-		 *
-		 * for normal clones, transport_get_remote_refs() should
-		 * return reliable ref set, we can delay cloning until after
-		 * remote HEAD check.
-		 */
-		for (ref = refs; ref; ref = ref->next)
-			if (is_null_oid(&ref->old_oid)) {
-				complete_refs_before_fetch = 0;
-				break;
-			}
-
-		if (!is_local && !complete_refs_before_fetch)
-			transport_fetch_refs(transport, mapped_refs);
-
-		remote_head = find_ref_by_name(refs, "HEAD");
-		remote_head_points_at =
-			guess_remote_head(remote_head, mapped_refs, 0);
-
-		if (option_branch) {
-			our_head_points_at =
-				find_remote_branch(mapped_refs, option_branch);
-
-			if (!our_head_points_at)
-				die(_("Remote branch %s not found in upstream %s"),
-				    option_branch, option_origin);
-		}
-		else
-			our_head_points_at = remote_head_points_at;
-	}
-	else {
-		if (option_branch)
-			die(_("Remote branch %s not found in upstream %s"),
-					option_branch, option_origin);
-
-		warning(_("You appear to have cloned an empty repository."));
-		mapped_refs = NULL;
-		our_head_points_at = NULL;
-		remote_head_points_at = NULL;
-		remote_head = NULL;
-		option_no_checkout = 1;
-		if (!option_bare) {
-			const char *branch = git_default_branch_name();
-			char *ref = xstrfmt("refs/heads/%s", branch);
-
-			install_branch_config(0, branch, option_origin, ref);
-			free(ref);
-		}
-	}
-
-	write_refspec_config(src_ref_prefix, our_head_points_at,
-			remote_head_points_at, &branch_top);
-
-	if (filter_options.choice)
-		partial_clone_register(option_origin, &filter_options);
-
-	if (is_local)
-		clone_local(path, git_dir);
-	else if (refs && complete_refs_before_fetch)
-		transport_fetch_refs(transport, mapped_refs);
-
-	update_remote_refs(refs, mapped_refs, remote_head_points_at,
-			   branch_top.buf, reflog_msg.buf, transport,
-			   !is_local);
-
-	update_head(our_head_points_at, remote_head, reflog_msg.buf);
-
-	/*
-	 * We want to show progress for recursive submodule clones iff
-	 * we did so for the main clone. But only the transport knows
-	 * the final decision for this flag, so we need to rescue the value
-	 * before we free the transport.
-	 */
-	submodule_progress = transport->progress;
-
-	transport_unlock_pack(transport);
-	transport_disconnect(transport);
-
-	if (option_dissociate) {
-		close_object_store(the_repository->objects);
-		dissociate_from_references();
-	}
-
-	junk_mode = JUNK_LEAVE_REPO;
-	err = checkout(submodule_progress);
-
-	strbuf_release(&reflog_msg);
-	strbuf_release(&branch_top);
-	strbuf_release(&key);
-	junk_mode = JUNK_LEAVE_ALL;
-
-	strvec_clear(&ref_prefixes);
-	return err;
-}