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Diffstat (limited to 'builtin-clone.c')
| -rw-r--r-- | builtin-clone.c | 550 |
1 files changed, 550 insertions, 0 deletions
diff --git a/builtin-clone.c b/builtin-clone.c new file mode 100644 index 0000000000..4740b13067 --- /dev/null +++ b/builtin-clone.c @@ -0,0 +1,550 @@ +/* + * 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" + +/* + * 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; +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 struct option builtin_clone_options[] = { + OPT__QUIET(&option_quiet), + 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('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 or '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 (!stat(path, &st) && S_ISDIR(st.st_mode)) { + *is_bundle = 0; + return xstrdup(make_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(make_absolute_path(path)); + } + } + + return NULL; +} + +static char *guess_dir_name(const char *repo, int is_bundle) +{ + const char *p, *start, *end, *limit; + int after_slash_or_colon; + + /* Guess dir name from repository: strip trailing '/', + * strip trailing '[:/]*.{git,bundle}', strip leading '.*[/:]'. */ + + after_slash_or_colon = 1; + limit = repo + strlen(repo); + start = repo; + end = limit; + for (p = repo; p < limit; p++) { + const char *prefix = is_bundle ? ".bundle" : ".git"; + if (!prefixcmp(p, prefix)) { + if (!after_slash_or_colon) + end = p; + p += strlen(prefix) - 1; + } else if (!prefixcmp(p, ".bundle")) { + if (!after_slash_or_colon) + end = p; + p += 7; + } else if (*p == '/' || *p == ':') { + if (end == limit) + end = p; + after_slash_or_colon = 1; + } else if (after_slash_or_colon) { + start = p; + end = limit; + after_slash_or_colon = 0; + } + } + + return xstrndup(start, end - start); +} + +static int is_directory(const char *path) +{ + struct stat buf; + + return !stat(path, &buf) && S_ISDIR(buf.st_mode); +} + +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; + if (getpid() != junk_pid) + return; + strbuf_init(&sb, 0); + 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); + get_fetch_map(refs, tag_refspec, &tail, 0); + + for (r = local_refs; r; r = r->next) + update_ref(reflog, + r->peer_ref->name, r->old_sha1, NULL, 0, DIE_ON_ERR); + 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; + + 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_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 = path; + 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); + + if (!stat(dir, &buf)) + die("destination directory '%s' already exists.", dir); + + strbuf_init(&reflog_msg, 0); + 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 (mkdir(work_tree, 0755)) + die("could not create work tree dir '%s'.", work_tree); + 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); + + set_git_dir(make_absolute_path(git_dir)); + + fprintf(stderr, "Initialize %s\n", git_dir); + init_db(option_template, option_quiet ? INIT_DB_QUIET : 0); + + if (option_reference) + setup_reference(git_dir); + + git_config(git_default_config, NULL); + + if (option_bare) { + strcpy(branch_top, "refs/heads/"); + + git_config_set("core.bare", "true"); + } else { + snprintf(branch_top, sizeof(branch_top), + "refs/remotes/%s/", option_origin); + + /* Configure the remote */ + 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), + "+refs/heads/*:%s*", branch_top); + git_config_set_multivar(key, value, "^$", 0); + } + + refspec.force = 0; + refspec.pattern = 1; + refspec.src = "refs/heads/"; + refspec.dst = branch_top; + + if (path && !is_bundle) + refs = clone_local(path, git_dir); + else { + struct remote *remote = remote_get(argv[0]); + struct transport *transport = transport_get(remote, argv[0]); + + 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; + + 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; + 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_init(&head_ref, 0); + 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 (!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; +} |