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-rw-r--r--builtin/worktree.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/builtin/worktree.c b/builtin/worktree.c
new file mode 100644
index 0000000000..6a264ee749
--- /dev/null
+++ b/builtin/worktree.c
@@ -0,0 +1,332 @@
+#include "cache.h"
+#include "builtin.h"
+#include "dir.h"
+#include "parse-options.h"
+#include "argv-array.h"
+#include "run-command.h"
+#include "sigchain.h"
+#include "refs.h"
+
+static const char * const worktree_usage[] = {
+ N_("git worktree add [<options>] <path> <branch>"),
+ N_("git worktree prune [<options>]"),
+ NULL
+};
+
+static int show_only;
+static int verbose;
+static unsigned long expire;
+
+static int prune_worktree(const char *id, struct strbuf *reason)
+{
+ struct stat st;
+ char *path;
+ int fd, len;
+
+ if (!is_directory(git_path("worktrees/%s", id))) {
+ strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
+ return 1;
+ }
+ if (file_exists(git_path("worktrees/%s/locked", id)))
+ return 0;
+ if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
+ strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
+ return 1;
+ }
+ fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
+ if (fd < 0) {
+ strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
+ id, strerror(errno));
+ return 1;
+ }
+ len = st.st_size;
+ path = xmalloc(len + 1);
+ read_in_full(fd, path, len);
+ close(fd);
+ while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
+ len--;
+ if (!len) {
+ strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
+ free(path);
+ return 1;
+ }
+ path[len] = '\0';
+ if (!file_exists(path)) {
+ struct stat st_link;
+ free(path);
+ /*
+ * the repo is moved manually and has not been
+ * accessed since?
+ */
+ if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
+ st_link.st_nlink > 1)
+ return 0;
+ if (st.st_mtime <= expire) {
+ strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
+ return 1;
+ } else {
+ return 0;
+ }
+ }
+ free(path);
+ return 0;
+}
+
+static void prune_worktrees(void)
+{
+ struct strbuf reason = STRBUF_INIT;
+ struct strbuf path = STRBUF_INIT;
+ DIR *dir = opendir(git_path("worktrees"));
+ struct dirent *d;
+ int ret;
+ if (!dir)
+ return;
+ while ((d = readdir(dir)) != NULL) {
+ if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+ continue;
+ strbuf_reset(&reason);
+ if (!prune_worktree(d->d_name, &reason))
+ continue;
+ if (show_only || verbose)
+ printf("%s\n", reason.buf);
+ if (show_only)
+ continue;
+ strbuf_reset(&path);
+ strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
+ ret = remove_dir_recursively(&path, 0);
+ if (ret < 0 && errno == ENOTDIR)
+ ret = unlink(path.buf);
+ if (ret)
+ error(_("failed to remove: %s"), strerror(errno));
+ }
+ closedir(dir);
+ if (!show_only)
+ rmdir(git_path("worktrees"));
+ strbuf_release(&reason);
+ strbuf_release(&path);
+}
+
+static int prune(int ac, const char **av, const char *prefix)
+{
+ struct option options[] = {
+ OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
+ OPT__VERBOSE(&verbose, N_("report pruned objects")),
+ OPT_EXPIRY_DATE(0, "expire", &expire,
+ N_("expire objects older than <time>")),
+ OPT_END()
+ };
+
+ expire = ULONG_MAX;
+ ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+ if (ac)
+ usage_with_options(worktree_usage, options);
+ prune_worktrees();
+ return 0;
+}
+
+static char *junk_work_tree;
+static char *junk_git_dir;
+static int is_junk;
+static pid_t junk_pid;
+
+static void remove_junk(void)
+{
+ struct strbuf sb = STRBUF_INIT;
+ if (!is_junk || 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_release(&sb);
+}
+
+static void remove_junk_on_signal(int signo)
+{
+ remove_junk();
+ sigchain_pop(signo);
+ raise(signo);
+}
+
+static const char *worktree_basename(const char *path, int *olen)
+{
+ const char *name;
+ int len;
+
+ len = strlen(path);
+ while (len && is_dir_sep(path[len - 1]))
+ len--;
+
+ for (name = path + len - 1; name > path; name--)
+ if (is_dir_sep(*name)) {
+ name++;
+ break;
+ }
+
+ *olen = len;
+ return name;
+}
+
+static int add_worktree(const char *path, const char **child_argv)
+{
+ struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
+ struct strbuf sb = STRBUF_INIT;
+ const char *name;
+ struct stat st;
+ struct child_process cp;
+ int counter = 0, len, ret;
+ unsigned char rev[20];
+
+ if (file_exists(path) && !is_empty_dir(path))
+ die(_("'%s' already exists"), path);
+
+ name = worktree_basename(path, &len);
+ strbuf_addstr(&sb_repo,
+ git_path("worktrees/%.*s", (int)(path + len - name), name));
+ len = sb_repo.len;
+ if (safe_create_leading_directories_const(sb_repo.buf))
+ die_errno(_("could not create leading directories of '%s'"),
+ sb_repo.buf);
+ while (!stat(sb_repo.buf, &st)) {
+ counter++;
+ strbuf_setlen(&sb_repo, len);
+ strbuf_addf(&sb_repo, "%d", counter);
+ }
+ name = strrchr(sb_repo.buf, '/') + 1;
+
+ junk_pid = getpid();
+ atexit(remove_junk);
+ sigchain_push_common(remove_junk_on_signal);
+
+ if (mkdir(sb_repo.buf, 0777))
+ die_errno(_("could not create directory of '%s'"), sb_repo.buf);
+ junk_git_dir = xstrdup(sb_repo.buf);
+ is_junk = 1;
+
+ /*
+ * lock the incomplete repo so prune won't delete it, unlock
+ * after the preparation is over.
+ */
+ strbuf_addf(&sb, "%s/locked", sb_repo.buf);
+ write_file(sb.buf, 1, "initializing\n");
+
+ strbuf_addf(&sb_git, "%s/.git", path);
+ if (safe_create_leading_directories_const(sb_git.buf))
+ die_errno(_("could not create leading directories of '%s'"),
+ sb_git.buf);
+ junk_work_tree = xstrdup(path);
+
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
+ write_file(sb.buf, 1, "%s\n", real_path(sb_git.buf));
+ write_file(sb_git.buf, 1, "gitdir: %s/worktrees/%s\n",
+ real_path(get_git_common_dir()), name);
+ /*
+ * This is to keep resolve_ref() happy. We need a valid HEAD
+ * or is_git_directory() will reject the directory. Moreover, HEAD
+ * in the new worktree must resolve to the same value as HEAD in
+ * the current tree since the command invoked to populate the new
+ * worktree will be handed the branch/ref specified by the user.
+ * For instance, if the user asks for the new worktree to be based
+ * at HEAD~5, then the resolved HEAD~5 in the new worktree must
+ * match the resolved HEAD~5 in the current tree in order to match
+ * the user's expectation.
+ */
+ if (!resolve_ref_unsafe("HEAD", 0, rev, NULL))
+ die(_("unable to resolve HEAD"));
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
+ write_file(sb.buf, 1, "%s\n", sha1_to_hex(rev));
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
+ write_file(sb.buf, 1, "../..\n");
+
+ fprintf_ln(stderr, _("Enter %s (identifier %s)"), path, name);
+
+ setenv("GIT_CHECKOUT_NEW_WORKTREE", "1", 1);
+ setenv(GIT_DIR_ENVIRONMENT, sb_git.buf, 1);
+ setenv(GIT_WORK_TREE_ENVIRONMENT, path, 1);
+ memset(&cp, 0, sizeof(cp));
+ cp.git_cmd = 1;
+ cp.argv = child_argv;
+ ret = run_command(&cp);
+ if (!ret) {
+ is_junk = 0;
+ free(junk_work_tree);
+ free(junk_git_dir);
+ junk_work_tree = NULL;
+ junk_git_dir = NULL;
+ }
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s/locked", sb_repo.buf);
+ unlink_or_warn(sb.buf);
+ strbuf_release(&sb);
+ strbuf_release(&sb_repo);
+ strbuf_release(&sb_git);
+ return ret;
+}
+
+static int add(int ac, const char **av, const char *prefix)
+{
+ int force = 0, detach = 0;
+ const char *new_branch = NULL, *new_branch_force = NULL;
+ const char *path, *branch;
+ struct argv_array cmd = ARGV_ARRAY_INIT;
+ struct option options[] = {
+ OPT__FORCE(&force, N_("checkout <branch> even if already checked out in other worktree")),
+ OPT_STRING('b', NULL, &new_branch, N_("branch"),
+ N_("create a new branch")),
+ OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
+ N_("create or reset a branch")),
+ OPT_BOOL(0, "detach", &detach, N_("detach HEAD at named commit")),
+ OPT_END()
+ };
+
+ ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+ if (new_branch && new_branch_force)
+ die(_("-b and -B are mutually exclusive"));
+ if (ac < 1 || ac > 2)
+ usage_with_options(worktree_usage, options);
+
+ path = prefix ? prefix_filename(prefix, strlen(prefix), av[0]) : av[0];
+ branch = ac < 2 ? "HEAD" : av[1];
+
+ if (ac < 2 && !new_branch && !new_branch_force) {
+ int n;
+ const char *s = worktree_basename(path, &n);
+ new_branch = xstrndup(s, n);
+ }
+
+ argv_array_push(&cmd, "checkout");
+ if (force)
+ argv_array_push(&cmd, "--ignore-other-worktrees");
+ if (new_branch)
+ argv_array_pushl(&cmd, "-b", new_branch, NULL);
+ if (new_branch_force)
+ argv_array_pushl(&cmd, "-B", new_branch_force, NULL);
+ if (detach)
+ argv_array_push(&cmd, "--detach");
+ argv_array_push(&cmd, branch);
+
+ return add_worktree(path, cmd.argv);
+}
+
+int cmd_worktree(int ac, const char **av, const char *prefix)
+{
+ struct option options[] = {
+ OPT_END()
+ };
+
+ if (ac < 2)
+ usage_with_options(worktree_usage, options);
+ if (!strcmp(av[1], "add"))
+ return add(ac - 1, av + 1, prefix);
+ if (!strcmp(av[1], "prune"))
+ return prune(ac - 1, av + 1, prefix);
+ usage_with_options(worktree_usage, options);
+}