diff options
Diffstat (limited to 'builtin/clone.c')
| -rw-r--r-- | builtin/clone.c | 1081 |
1 files changed, 1081 insertions, 0 deletions
diff --git a/builtin/clone.c b/builtin/clone.c new file mode 100644 index 0000000000..578da85254 --- /dev/null +++ b/builtin/clone.c @@ -0,0 +1,1081 @@ +/* + * 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 "lockfile.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 "sigchain.h" +#include "branch.h" +#include "remote.h" +#include "run-command.h" +#include "connected.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, 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 = -1; +static struct string_list option_config; +static struct string_list option_reference; +static int option_dissociate; + +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")), + OPT_BOOL(0, "recursive", &option_recursive, + N_("initialize submodules in the clone")), + OPT_BOOL(0, "recurse-submodules", &option_recursive, + N_("initialize submodules in the clone")), + OPT_STRING(0, "template", &option_template, N_("template-directory"), + N_("directory from which templates will be used")), + OPT_STRING_LIST(0, "reference", &option_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_BOOL(0, "single-branch", &option_single_branch, + N_("clone only one branch, HEAD or --branch")), + 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_END() +}; + +static const char *argv_submodule[] = { + "submodule", "update", "--init", "--recursive", NULL +}; + +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 ? xstrdup(absolute_path(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) +{ + char *ref_git; + const char *repo; + struct strbuf alternate = STRBUF_INIT; + + /* Beware: read_gitfile(), real_path() and mkpath() return static buffer */ + ref_git = xstrdup(real_path(item->string)); + + repo = read_gitfile(ref_git); + if (!repo) + repo = read_gitfile(mkpath("%s/.git", ref_git)); + if (repo) { + free(ref_git); + ref_git = xstrdup(repo); + } + + if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) { + char *ref_git_git = mkpathdup("%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 repository."), + item->string); + + if (!access(mkpath("%s/shallow", ref_git), F_OK)) + die(_("reference repository '%s' is shallow"), item->string); + + if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) + die(_("reference repository '%s' is grafted"), item->string); + + strbuf_addf(&alternate, "%s/objects", ref_git); + add_to_alternates_file(alternate.buf); + strbuf_release(&alternate); + 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; + 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); + normalize_path_copy(abs_path, abs_path); + add_to_alternates_file(abs_path); + free(abs_path); + } + 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 > 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); + } + closedir(dir); +} + +static void clone_local(const char *src_repo, const char *dest_repo) +{ + 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); + } + + if (0 <= option_verbosity) + fprintf(stderr, _("done.\n")); +} + +static const char *junk_work_tree; +static const char *junk_git_dir; +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 the checkout with 'git checkout -f 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, 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 *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 { + get_fetch_map(remote_head, refspec, &tail, 0); + + /* if --branch=tag, pull the requested tag explicitly */ + get_fetch_map(remote_head, tag_refspec, &tail, 0); + } + } else + get_fetch_map(refs, refspec, &tail, 0); + + if (!option_mirror && !option_single_branch) + 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_sha1, + 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_sha1_file(ref->old_sha1)) + continue; + update_ref(msg, ref->name, ref->old_sha1, + NULL, 0, UPDATE_REFS_DIE_ON_ERR); + } +} + +static int iterate_ref_map(void *cb_data, unsigned char sha1[20]) +{ + 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; + + hashcpy(sha1, ref->old_sha1); + *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) { + if (transport->progress) + fprintf(stderr, _("Checking connectivity... ")); + if (check_everything_connected_with_transport(iterate_ref_map, + 0, &rm, transport)) + die(_("remote did not send all necessary objects")); + if (transport->progress) + fprintf(stderr, _("done.\n")); + } + + if (refs) { + write_remote_refs(mapped_refs); + if (option_single_branch) + 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"); + create_symref(head_ref.buf, + remote_head_points_at->peer_ref->name, + msg); + } +} + +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 */ + create_symref("HEAD", our->name, NULL); + if (!option_bare) { + update_ref(msg, "HEAD", our->old_sha1, 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(our->old_sha1); + /* --branch specifies a non-branch (i.e. tags), detach HEAD */ + update_ref(msg, "HEAD", c->object.sha1, + NULL, REF_NODEREF, 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_sha1, + NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR); + } +} + +static int checkout(void) +{ + unsigned char sha1[20]; + char *head; + struct lock_file *lock_file; + 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, sha1, 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(sha1_to_hex(sha1)); + } else { + if (!starts_with(head, "refs/heads/")) + die(_("HEAD not found below refs/heads!")); + } + free(head); + + /* We need to be in the new work tree for the checkout */ + setup_work_tree(); + + lock_file = xcalloc(1, sizeof(struct lock_file)); + 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(sha1); + parse_tree(tree); + init_tree_desc(&t, tree->buffer, tree->size); + if (unpack_trees(1, &t, &opts) < 0) + die(_("unable to checkout working tree")); + + if (write_locked_index(&the_index, lock_file, COMMIT_LOCK)) + die(_("unable to write new index file")); + + err |= run_hook_le(NULL, "post-checkout", sha1_to_hex(null_sha1), + sha1_to_hex(sha1), "1", NULL); + + if (!err && option_recursive) + err = run_command_v_opt(argv_submodule, RUN_GIT_CMD); + + return err; +} + +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"); + } +} + +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)) + die("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 }; + + if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN)) + die(_("cannot repack to clean up")); + if (unlink(git_path("objects/info/alternates")) && errno != ENOENT) + die_errno(_("cannot unlink temporary alternates 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; + const struct ref *ref; + struct strbuf key = STRBUF_INIT, value = 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; + + struct refspec *refspec; + const char *fetch_pattern; + + 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_single_branch == -1) + option_single_branch = option_depth ? 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 = xstrdup(absolute_path(repo_name)); + else if (!strchr(repo_name, ':')) + die(_("repository '%s' does not exist"), repo_name); + else + repo = 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 = !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 = 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 && 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); + } + + junk_git_dir = git_dir; + 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; + junk_git_dir = real_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); + } + init_db(option_template, INIT_DB_QUIET); + 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(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf); + strbuf_addf(&key, "remote.%s.url", option_origin); + git_config_set(key.buf, repo); + strbuf_reset(&key); + + if (option_reference.nr) + setup_reference(); + else if (option_dissociate) { + warning(_("--dissociate given, but there is no --reference")); + option_dissociate = 0; + } + + fetch_pattern = value.buf; + refspec = parse_fetch_refspec(1, &fetch_pattern); + + strbuf_reset(&value); + + remote = remote_get(option_origin); + transport = transport_get(remote, remote->url[0]); + transport_set_verbosity(transport, option_verbosity, option_progress); + + 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 (!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; + + if (!transport->get_refs_list || (!is_local && !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_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 (transport->smart_options && !option_depth) + transport->smart_options->check_self_contained_and_connected = 1; + + refs = transport_get_remote_refs(transport); + + if (refs) { + mapped_refs = wanted_peer_refs(refs, refspec); + /* + * 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_sha1(ref->old_sha1)) { + 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) + install_branch_config(0, "master", option_origin, + "refs/heads/master"); + } + + write_refspec_config(src_ref_prefix, our_head_points_at, + remote_head_points_at, &branch_top); + + 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); + + transport_unlock_pack(transport); + transport_disconnect(transport); + + if (option_dissociate) + dissociate_from_references(); + + junk_mode = JUNK_LEAVE_REPO; + err = checkout(); + + strbuf_release(&reflog_msg); + strbuf_release(&branch_top); + strbuf_release(&key); + strbuf_release(&value); + junk_mode = JUNK_LEAVE_ALL; + + free(refspec); + return err; +} |