diff options
Diffstat (limited to 'builtin/clone.c')
| -rw-r--r-- | builtin/clone.c | 785 |
1 files changed, 785 insertions, 0 deletions
diff --git a/builtin/clone.c b/builtin/clone.c new file mode 100644 index 0000000000..488f48e9a5 --- /dev/null +++ b/builtin/clone.c @@ -0,0 +1,785 @@ +/* + * 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 "builtin.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_no_checkout, option_bare, option_mirror; +static int option_local, option_no_hardlinks, option_shared, option_recursive; +static char *option_template, *option_depth; +static char *option_origin = NULL; +static char *option_branch = NULL; +static const char *real_git_dir; +static char *option_upload_pack = "git-upload-pack"; +static int option_verbosity; +static int option_progress; +static struct string_list option_config; +static struct string_list option_reference; + +static int opt_parse_reference(const struct option *opt, const char *arg, int unset) +{ + struct string_list *option_reference = opt->value; + if (!arg) + return -1; + string_list_append(option_reference, arg); + return 0; +} + +static struct option builtin_clone_options[] = { + OPT__VERBOSITY(&option_verbosity), + OPT_BOOLEAN(0, "progress", &option_progress, + "force progress reporting"), + OPT_BOOLEAN('n', "no-checkout", &option_no_checkout, + "don't create a checkout"), + OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"), + { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL, + "create a bare repository", + PARSE_OPT_NOARG | PARSE_OPT_HIDDEN }, + 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, + "initialize submodules in the clone"), + OPT_BOOLEAN(0, "recurse-submodules", &option_recursive, + "initialize submodules in the clone"), + OPT_STRING(0, "template", &option_template, "template-directory", + "directory from which templates will be used"), + OPT_CALLBACK(0 , "reference", &option_reference, "repo", + "reference repository", &opt_parse_reference), + OPT_STRING('o', "origin", &option_origin, "branch", + "use <branch> instead of 'origin' to track upstream"), + OPT_STRING('b', "branch", &option_branch, "branch", + "checkout <branch> instead of the remote's HEAD"), + 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_STRING(0, "separate-git-dir", &real_git_dir, "gitdir", + "separate git dir from working tree"), + OPT_STRING_LIST('c', "config", &option_config, "key=value", + "set config inside the new repository"), + 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 (stat(path, &st)) + continue; + if (S_ISDIR(st.st_mode)) { + *is_bundle = 0; + return xstrdup(absolute_path(path)); + } else if (S_ISREG(st.st_mode) && st.st_size > 8) { + /* Is it a "gitfile"? */ + char signature[8]; + int len, fd = open(path, O_RDONLY); + if (fd < 0) + continue; + len = read_in_full(fd, signature, 8); + close(fd); + if (len != 8 || strncmp(signature, "gitdir: ", 8)) + continue; + path = read_gitfile(path); + if (path) { + *is_bundle = 0; + return xstrdup(absolute_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(absolute_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 int add_one_reference(struct string_list_item *item, void *cb_data) +{ + char *ref_git; + struct strbuf alternate = STRBUF_INIT; + struct remote *remote; + struct transport *transport; + const struct ref *extra; + + /* Beware: real_path() and mkpath() return static buffer */ + ref_git = xstrdup(real_path(item->string)); + if (is_directory(mkpath("%s/.git/objects", ref_git))) { + char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git)); + free(ref_git); + ref_git = ref_git_git; + } else if (!is_directory(mkpath("%s/objects", ref_git))) + die(_("reference repository '%s' is not a local directory."), + item->string); + + strbuf_addf(&alternate, "%s/objects", ref_git); + add_to_alternates_file(alternate.buf); + strbuf_release(&alternate); + + remote = remote_get(ref_git); + transport = transport_get(remote, ref_git); + 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); + return 0; +} + +static void setup_reference(void) +{ + for_each_string_list(&option_reference, add_one_reference, NULL); +} + +static void copy_alternates(struct strbuf *src, struct strbuf *dst, + 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 = fopen(src->buf, "r"); + struct strbuf line = STRBUF_INIT; + + while (strbuf_getline(&line, in, '\n') != EOF) { + char *abs_path, abs_buf[PATH_MAX]; + if (!line.len || line.buf[0] == '#') + continue; + if (is_absolute_path(line.buf)) { + add_to_alternates_file(line.buf); + continue; + } + abs_path = mkpath("%s/objects/%s", src_repo, line.buf); + normalize_path_copy(abs_buf, abs_path); + add_to_alternates_file(abs_buf); + } + strbuf_release(&line); + fclose(in); +} + +static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest, + const char *src_repo, int src_baselen) +{ + 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, + src_repo, src_baselen); + continue; + } + + /* Files that cannot be copied bit-for-bit... */ + if (!strcmp(src->buf + src_baselen, "/info/alternates")) { + copy_alternates(src, dest, src_repo); + 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_with_time(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 remote *remote; + struct transport *transport; + + if (option_shared) { + struct strbuf alt = STRBUF_INIT; + strbuf_addf(&alt, "%s/objects", src_repo); + add_to_alternates_file(alt.buf); + strbuf_release(&alt); + } else { + struct strbuf src = STRBUF_INIT; + struct strbuf dest = STRBUF_INIT; + strbuf_addf(&src, "%s/objects", src_repo); + strbuf_addf(&dest, "%s/objects", dest_repo); + copy_or_link_directory(&src, &dest, src_repo, src.len); + 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); + if (0 <= option_verbosity) + printf(_("done.\n")); + 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 *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; + + get_fetch_map(refs, refspec, &tail, 0); + if (!option_mirror) + 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; + + for (r = local_refs; r; r = r->next) { + if (!r->peer_ref) + continue; + add_extra_ref(r->peer_ref->name, r->old_sha1, 0); + } + + pack_refs(PACK_REFS_ALL); + clear_extra_refs(); +} + +static int write_one_config(const char *key, const char *value, void *data) +{ + return git_config_set_multivar(key, value ? value : "true", "^$", 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"); + } +} + +int cmd_clone(int argc, const char **argv, const char *prefix) +{ + int is_bundle = 0, is_local; + struct stat buf; + const char *repo_name, *repo, *work_tree, *git_dir; + char *path, *dir; + int dest_exists; + const struct ref *refs, *remote_head; + const struct ref *remote_head_points_at; + const struct ref *our_head_points_at; + struct ref *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(); + + 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_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(absolute_path(repo_name)); + else if (!strchr(repo_name, ':')) + die(_("repository '%s' does not exist"), repo_name); + else + repo = repo_name; + is_local = path && !is_bundle; + if (is_local && option_depth) + warning(_("--depth is ignored in local clones; use file:// instead.")); + + 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_init(git_dir, real_git_dir, 0); + if (real_git_dir) + git_dir = real_git_dir; + + if (0 <= option_verbosity) { + if (option_bare) + printf(_("Cloning into bare repository %s...\n"), dir); + else + printf(_("Cloning into %s...\n"), dir); + } + init_db(option_template, INIT_DB_QUIET); + write_config(&option_config); + + /* + * 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); + + 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); + + if (option_reference.nr) + setup_reference(); + + fetch_pattern = value.buf; + refspec = parse_fetch_refspec(1, &fetch_pattern); + + strbuf_reset(&value); + + if (is_local) { + refs = clone_local(path, git_dir); + mapped_refs = wanted_peer_refs(refs, refspec); + } else { + struct remote *remote = remote_get(option_origin); + 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); + + transport_set_verbosity(transport, option_verbosity, option_progress); + + if (option_upload_pack) + transport_set_option(transport, TRANS_OPT_UPLOADPACK, + option_upload_pack); + + refs = transport_get_remote_refs(transport); + if (refs) { + mapped_refs = wanted_peer_refs(refs, refspec); + transport_fetch_refs(transport, mapped_refs); + } + } + + if (refs) { + clear_extra_refs(); + + write_remote_refs(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) { + struct strbuf head = STRBUF_INIT; + strbuf_addstr(&head, src_ref_prefix); + strbuf_addstr(&head, option_branch); + our_head_points_at = + find_ref_by_name(mapped_refs, head.buf); + strbuf_release(&head); + + if (!our_head_points_at) { + warning(_("Remote branch %s not found in " + "upstream %s, using HEAD instead"), + option_branch, option_origin); + our_head_points_at = remote_head_points_at; + } + } + else + our_head_points_at = remote_head_points_at; + } + else { + warning(_("You appear to have cloned an empty repository.")); + our_head_points_at = NULL; + remote_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 (remote_head_points_at && !option_bare) { + struct strbuf head_ref = STRBUF_INIT; + strbuf_addstr(&head_ref, branch_top.buf); + strbuf_addstr(&head_ref, "HEAD"); + create_symref(head_ref.buf, + remote_head_points_at->peer_ref->name, + reflog_msg.buf); + } + + if (our_head_points_at) { + /* Local default branch link */ + create_symref("HEAD", our_head_points_at->name, NULL); + if (!option_bare) { + const char *head = skip_prefix(our_head_points_at->name, + "refs/heads/"); + update_ref(reflog_msg.buf, "HEAD", + our_head_points_at->old_sha1, + NULL, 0, DIE_ON_ERR); + install_branch_config(0, head, option_origin, + our_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); + our_head_points_at = remote_head; + } + } 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); + transport_disconnect(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_verbosity > 0); + opts.src_index = &the_index; + opts.dst_index = &the_index; + + tree = parse_tree_indirect(our_head_points_at->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(our_head_points_at->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; +} |