/*

* 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"

/*

* 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;

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_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 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;

/*

* Strip trailing slashes and /.git

*/

while (repo < end && is_dir_sep(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) {

char *result = xmalloc(end - start + 5);

sprintf(result, "%.*s.git", (int)(end - start), start);

return result;

}

return xstrndup(start, end - start);

}

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(char *src, char *dest)

{

struct dirent *de;

struct stat buf;

int src_len, dest_len;

DIR *dir;

dir = opendir(src);

if (!dir)

die("failed to open %s\n", src);

if (mkdir(dest, 0777)) {

if (errno != EEXIST)

die("failed to create directory %s\n", dest);

else if (stat(dest, &buf))

die("failed to stat %s\n", dest);

else if (!S_ISDIR(buf.st_mode))

die("%s exists and is not a directory\n", dest);

}

src_len = strlen(src);

src[src_len] = '/';

dest_len = strlen(dest);

dest[dest_len] = '/';

while ((de = readdir(dir)) != NULL) {

strcpy(src + src_len + 1, de->d_name);

strcpy(dest + dest_len + 1, de->d_name);

if (stat(src, &buf)) {

warning ("failed to stat %s\n", src);

continue;

}

if (S_ISDIR(buf.st_mode)) {

if (de->d_name[0] != '.')

copy_or_link_directory(src, dest);

continue;

}

if (unlink(dest) && errno != ENOENT)

die("failed to unlink %s\n", dest);

if (!option_no_hardlinks) {

if (!link(src, dest))

continue;

if (option_local)

die("failed to create link %s\n", dest);

option_no_hardlinks = 1;

}

if (copy_file(dest, src, 0666))

die("failed to copy file to %s\n", dest);

}

closedir(dir);

}

static const struct ref *clone_local(const char *src_repo,

const char *dest_repo)

{

const struct ref *ret;

char src[PATH_MAX];

char dest[PATH_MAX];

struct remote *remote;

struct transport *transport;

if (option_shared)

add_to_alternates_file(src_repo);

else {

snprintf(src, PATH_MAX, "%s/objects", src_repo);

snprintf(dest, PATH_MAX, "%s/objects", dest_repo);

copy_or_link_directory(src, 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;

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();

signal(SIGINT, SIG_DFL);

raise(signo);

}

static const struct ref *locate_head(const struct ref *refs,

const struct ref *mapped_refs,

const struct ref **remote_head_p)

{

const struct ref *remote_head = NULL;

const struct ref *remote_master = NULL;

const struct ref *r;

for (r = refs; r; r = r->next)

if (!strcmp(r->name, "HEAD"))

remote_head = r;

for (r = mapped_refs; r; r = r->next)

if (!strcmp(r->name, "refs/heads/master"))

remote_master = r;

if (remote_head_p)

*remote_head_p = remote_head;

/* If there's no HEAD value at all, never mind. */

if (!remote_head)

return NULL;

/* If refs/heads/master could be right, it is. */

if (remote_master && !hashcmp(remote_master->old_sha1,

remote_head->old_sha1))

return remote_master;

/* Look for another ref that points there */

for (r = mapped_refs; r; r = r->next)

if (r != remote_head &&

!hashcmp(r->old_sha1, remote_head->old_sha1))

return r;

/* Nothing is the same */

return NULL;

}

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 use_local_hardlinks = 1;

int use_separate_remote = 1;

int is_bundle = 0;

struct stat buf;

const char *repo_name, *repo, *work_tree, *git_dir;

char *path, *dir;

const struct ref *refs, *head_points_at, *remote_head, *mapped_refs;

char branch_top[256], key[256], value[256];

struct strbuf reflog_msg = STRBUF_INIT;

struct transport *transport = NULL;

char *src_ref_prefix = "refs/heads/";

struct refspec refspec;

junk_pid = getpid();

argc = parse_options(argc, argv, builtin_clone_options,

builtin_clone_usage, 0);

if (argc == 0)

die("You must specify a repository to clone.");

if (option_no_hardlinks)

use_local_hardlinks = 0;

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;

use_separate_remote = 0;

}

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);

if (!stat(dir, &buf))

die("destination directory '%s' already exists.", 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("could not create leading directories of '%s': %s",

work_tree, strerror(errno));

if (mkdir(work_tree, 0755))

die("could not create work tree dir '%s': %s.",

work_tree, strerror(errno));

set_git_work_tree(work_tree);

}

junk_git_dir = git_dir;

atexit(remove_junk);

signal(SIGINT, remove_junk_on_signal);

setenv(CONFIG_ENVIRONMENT, xstrdup(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/";

strcpy(branch_top, src_ref_prefix);

git_config_set("core.bare", "true");

} else {

snprintf(branch_top, sizeof(branch_top),

"refs/remotes/%s/", option_origin);

}

if (option_mirror || !option_bare) {

/* Configure the remote */

if (option_mirror) {

snprintf(key, sizeof(key),

"remote.%s.mirror", option_origin);

git_config_set(key, "true");

}

snprintf(key, sizeof(key), "remote.%s.url", option_origin);

git_config_set(key, repo);

snprintf(key, sizeof(key), "remote.%s.fetch", option_origin);

snprintf(value, sizeof(value),

"+%s*:%s*", src_ref_prefix, branch_top);

git_config_set_multivar(key, value, "^$", 0);

}

refspec.force = 0;

refspec.pattern = 1;

refspec.src = src_ref_prefix;

refspec.dst = branch_top;

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);

transport_fetch_refs(transport, refs);

}

clear_extra_refs();

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

head_points_at = locate_head(refs, mapped_refs, &remote_head);

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);

strbuf_addstr(&head_ref, "HEAD");

/* Remote branch link */

create_symref(head_ref.buf,

head_points_at->peer_ref->name,

reflog_msg.buf);

snprintf(key, sizeof(key), "branch.%s.remote", head);

git_config_set(key, option_origin);

snprintf(key, sizeof(key), "branch.%s.merge", head);

git_config_set(key, 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");

}

strbuf_release(&reflog_msg);

junk_pid = 0;

return 0;

}