builtin/worktree.c

   1 #include "cache.h"
   2 #include "checkout.h"
   3 #include "config.h"
   4 #include "builtin.h"
   5 #include "dir.h"
   6 #include "parse-options.h"
   7 #include "argv-array.h"
   8 #include "branch.h"
   9 #include "refs.h"
  10 #include "run-command.h"
  11 #include "sigchain.h"
  12 #include "submodule.h"
  13 #include "refs.h"
  14 #include "utf8.h"
  15 #include "worktree.h"
  16
  17 static const char * const worktree_usage[] = {
  18         N_("git worktree add [<options>] <path> [<commit-ish>]"),
  19         N_("git worktree list [<options>]"),
  20         N_("git worktree lock [<options>] <path>"),
  21         N_("git worktree move <worktree> <new-path>"),
  22         N_("git worktree prune [<options>]"),
  23         N_("git worktree remove [<options>] <worktree>"),
  24         N_("git worktree unlock <path>"),
  25         NULL
  26 };
  27
  28 struct add_opts {
  29         int force;
  30         int detach;
  31         int quiet;
  32         int checkout;
  33         int keep_locked;
  34 };
  35
  36 static int show_only;
  37 static int verbose;
  38 static int guess_remote;
  39 static timestamp_t expire;
  40
  41 static int git_worktree_config(const char *var, const char *value, void *cb)
  42 {
  43         if (!strcmp(var, "worktree.guessremote")) {
  44                 guess_remote = git_config_bool(var, value);
  45                 return 0;
  46         }
  47
  48         return git_default_config(var, value, cb);
  49 }
  50
  51 static int delete_git_dir(const char *id)
  52 {
  53         struct strbuf sb = STRBUF_INIT;
  54         int ret;
  55
  56         strbuf_addstr(&sb, git_common_path("worktrees/%s", id));
  57         ret = remove_dir_recursively(&sb, 0);
  58         if (ret < 0 && errno == ENOTDIR)
  59                 ret = unlink(sb.buf);
  60         if (ret)
  61                 error_errno(_("failed to delete '%s'"), sb.buf);
  62         strbuf_release(&sb);
  63         return ret;
  64 }
  65
  66 static void delete_worktrees_dir_if_empty(void)
  67 {
  68         rmdir(git_path("worktrees")); /* ignore failed removal */
  69 }
  70
  71 static int prune_worktree(const char *id, struct strbuf *reason)
  72 {
  73         struct stat st;
  74         char *path;
  75         int fd;
  76         size_t len;
  77         ssize_t read_result;
  78
  79         if (!is_directory(git_path("worktrees/%s", id))) {
  80                 strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  81                 return 1;
  82         }
  83         if (file_exists(git_path("worktrees/%s/locked", id)))
  84                 return 0;
  85         if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  86                 strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  87                 return 1;
  88         }
  89         fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  90         if (fd < 0) {
  91                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  92                             id, strerror(errno));
  93                 return 1;
  94         }
  95         len = xsize_t(st.st_size);
  96         path = xmallocz(len);
  97
  98         read_result = read_in_full(fd, path, len);
  99         if (read_result < 0) {
 100                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
 101                             id, strerror(errno));
 102                 close(fd);
 103                 free(path);
 104                 return 1;
 105         }
 106         close(fd);
 107
 108         if (read_result != len) {
 109                 strbuf_addf(reason,
 110                             _("Removing worktrees/%s: short read (expected %"PRIuMAX" bytes, read %"PRIuMAX")"),
 111                             id, (uintmax_t)len, (uintmax_t)read_result);
 112                 free(path);
 113                 return 1;
 114         }
 115         while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
 116                 len--;
 117         if (!len) {
 118                 strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
 119                 free(path);
 120                 return 1;
 121         }
 122         path[len] = '\0';
 123         if (!file_exists(path)) {
 124                 free(path);
 125                 if (stat(git_path("worktrees/%s/index", id), &st) ||
 126                     st.st_mtime <= expire) {
 127                         strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
 128                         return 1;
 129                 } else {
 130                         return 0;
 131                 }
 132         }
 133         free(path);
 134         return 0;
 135 }
 136
 137 static void prune_worktrees(void)
 138 {
 139         struct strbuf reason = STRBUF_INIT;
 140         DIR *dir = opendir(git_path("worktrees"));
 141         struct dirent *d;
 142         if (!dir)
 143                 return;
 144         while ((d = readdir(dir)) != NULL) {
 145                 if (is_dot_or_dotdot(d->d_name))
 146                         continue;
 147                 strbuf_reset(&reason);
 148                 if (!prune_worktree(d->d_name, &reason))
 149                         continue;
 150                 if (show_only || verbose)
 151                         printf("%s\n", reason.buf);
 152                 if (show_only)
 153                         continue;
 154                 delete_git_dir(d->d_name);
 155         }
 156         closedir(dir);
 157         if (!show_only)
 158                 delete_worktrees_dir_if_empty();
 159         strbuf_release(&reason);
 160 }
 161
 162 static int prune(int ac, const char **av, const char *prefix)
 163 {
 164         struct option options[] = {
 165                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 166                 OPT__VERBOSE(&verbose, N_("report pruned working trees")),
 167                 OPT_EXPIRY_DATE(0, "expire", &expire,
 168                                 N_("expire working trees older than <time>")),
 169                 OPT_END()
 170         };
 171
 172         expire = TIME_MAX;
 173         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 174         if (ac)
 175                 usage_with_options(worktree_usage, options);
 176         prune_worktrees();
 177         return 0;
 178 }
 179
 180 static char *junk_work_tree;
 181 static char *junk_git_dir;
 182 static int is_junk;
 183 static pid_t junk_pid;
 184
 185 static void remove_junk(void)
 186 {
 187         struct strbuf sb = STRBUF_INIT;
 188         if (!is_junk || getpid() != junk_pid)
 189                 return;
 190         if (junk_git_dir) {
 191                 strbuf_addstr(&sb, junk_git_dir);
 192                 remove_dir_recursively(&sb, 0);
 193                 strbuf_reset(&sb);
 194         }
 195         if (junk_work_tree) {
 196                 strbuf_addstr(&sb, junk_work_tree);
 197                 remove_dir_recursively(&sb, 0);
 198         }
 199         strbuf_release(&sb);
 200 }
 201
 202 static void remove_junk_on_signal(int signo)
 203 {
 204         remove_junk();
 205         sigchain_pop(signo);
 206         raise(signo);
 207 }
 208
 209 static const char *worktree_basename(const char *path, int *olen)
 210 {
 211         const char *name;
 212         int len;
 213
 214         len = strlen(path);
 215         while (len && is_dir_sep(path[len - 1]))
 216                 len--;
 217
 218         for (name = path + len - 1; name > path; name--)
 219                 if (is_dir_sep(*name)) {
 220                         name++;
 221                         break;
 222                 }
 223
 224         *olen = len;
 225         return name;
 226 }
 227
 228 static void validate_worktree_add(const char *path, const struct add_opts *opts)
 229 {
 230         struct worktree **worktrees;
 231         struct worktree *wt;
 232         int locked;
 233
 234         if (file_exists(path) && !is_empty_dir(path))
 235                 die(_("'%s' already exists"), path);
 236
 237         worktrees = get_worktrees(0);
 238         /*
 239          * find_worktree()'s suffix matching may undesirably find the main
 240          * rather than a linked worktree (for instance, when the basenames
 241          * of the main worktree and the one being created are the same).
 242          * We're only interested in linked worktrees, so skip the main
 243          * worktree with +1.
 244          */
 245         wt = find_worktree(worktrees + 1, NULL, path);
 246         if (!wt)
 247                 goto done;
 248
 249         locked = !!worktree_lock_reason(wt);
 250         if ((!locked && opts->force) || (locked && opts->force > 1)) {
 251                 if (delete_git_dir(wt->id))
 252                     die(_("unable to re-add worktree '%s'"), path);
 253                 goto done;
 254         }
 255
 256         if (locked)
 257                 die(_("'%s' is a missing but locked worktree;\nuse 'add -f -f' to override, or 'unlock' and 'prune' or 'remove' to clear"), path);
 258         else
 259                 die(_("'%s' is a missing but already registered worktree;\nuse 'add -f' to override, or 'prune' or 'remove' to clear"), path);
 260
 261 done:
 262         free_worktrees(worktrees);
 263 }
 264
 265 static int add_worktree(const char *path, const char *refname,
 266                         const struct add_opts *opts)
 267 {
 268         struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 269         struct strbuf sb = STRBUF_INIT;
 270         const char *name;
 271         struct stat st;
 272         struct child_process cp = CHILD_PROCESS_INIT;
 273         struct argv_array child_env = ARGV_ARRAY_INIT;
 274         int counter = 0, len, ret;
 275         struct strbuf symref = STRBUF_INIT;
 276         struct commit *commit = NULL;
 277         int is_branch = 0;
 278
 279         validate_worktree_add(path, opts);
 280
 281         /* is 'refname' a branch or commit? */
 282         if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 283             ref_exists(symref.buf)) {
 284                 is_branch = 1;
 285                 if (!opts->force)
 286                         die_if_checked_out(symref.buf, 0);
 287         }
 288         commit = lookup_commit_reference_by_name(refname);
 289         if (!commit)
 290                 die(_("invalid reference: %s"), refname);
 291
 292         name = worktree_basename(path, &len);
 293         git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
 294         len = sb_repo.len;
 295         if (safe_create_leading_directories_const(sb_repo.buf))
 296                 die_errno(_("could not create leading directories of '%s'"),
 297                           sb_repo.buf);
 298         while (!stat(sb_repo.buf, &st)) {
 299                 counter++;
 300                 strbuf_setlen(&sb_repo, len);
 301                 strbuf_addf(&sb_repo, "%d", counter);
 302         }
 303         name = strrchr(sb_repo.buf, '/') + 1;
 304
 305         junk_pid = getpid();
 306         atexit(remove_junk);
 307         sigchain_push_common(remove_junk_on_signal);
 308
 309         if (mkdir(sb_repo.buf, 0777))
 310                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 311         junk_git_dir = xstrdup(sb_repo.buf);
 312         is_junk = 1;
 313
 314         /*
 315          * lock the incomplete repo so prune won't delete it, unlock
 316          * after the preparation is over.
 317          */
 318         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 319         if (!opts->keep_locked)
 320                 write_file(sb.buf, "initializing");
 321         else
 322                 write_file(sb.buf, "added with --lock");
 323
 324         strbuf_addf(&sb_git, "%s/.git", path);
 325         if (safe_create_leading_directories_const(sb_git.buf))
 326                 die_errno(_("could not create leading directories of '%s'"),
 327                           sb_git.buf);
 328         junk_work_tree = xstrdup(path);
 329
 330         strbuf_reset(&sb);
 331         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 332         write_file(sb.buf, "%s", real_path(sb_git.buf));
 333         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 334                    real_path(get_git_common_dir()), name);
 335         /*
 336          * This is to keep resolve_ref() happy. We need a valid HEAD
 337          * or is_git_directory() will reject the directory. Any value which
 338          * looks like an object ID will do since it will be immediately
 339          * replaced by the symbolic-ref or update-ref invocation in the new
 340          * worktree.
 341          */
 342         strbuf_reset(&sb);
 343         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 344         write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
 345         strbuf_reset(&sb);
 346         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 347         write_file(sb.buf, "../..");
 348
 349         argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 350         argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 351         cp.git_cmd = 1;
 352
 353         if (!is_branch)
 354                 argv_array_pushl(&cp.args, "update-ref", "HEAD",
 355                                  oid_to_hex(&commit->object.oid), NULL);
 356         else {
 357                 argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 358                                  symref.buf, NULL);
 359                 if (opts->quiet)
 360                         argv_array_push(&cp.args, "--quiet");
 361         }
 362
 363         cp.env = child_env.argv;
 364         ret = run_command(&cp);
 365         if (ret)
 366                 goto done;
 367
 368         if (opts->checkout) {
 369                 cp.argv = NULL;
 370                 argv_array_clear(&cp.args);
 371                 argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 372                 if (opts->quiet)
 373                         argv_array_push(&cp.args, "--quiet");
 374                 cp.env = child_env.argv;
 375                 ret = run_command(&cp);
 376                 if (ret)
 377                         goto done;
 378         }
 379
 380         is_junk = 0;
 381         FREE_AND_NULL(junk_work_tree);
 382         FREE_AND_NULL(junk_git_dir);
 383
 384 done:
 385         if (ret || !opts->keep_locked) {
 386                 strbuf_reset(&sb);
 387                 strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 388                 unlink_or_warn(sb.buf);
 389         }
 390
 391         /*
 392          * Hook failure does not warrant worktree deletion, so run hook after
 393          * is_junk is cleared, but do return appropriate code when hook fails.
 394          */
 395         if (!ret && opts->checkout) {
 396                 const char *hook = find_hook("post-checkout");
 397                 if (hook) {
 398                         const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
 399                         cp.git_cmd = 0;
 400                         cp.no_stdin = 1;
 401                         cp.stdout_to_stderr = 1;
 402                         cp.dir = path;
 403                         cp.env = env;
 404                         cp.argv = NULL;
 405                         cp.trace2_hook_name = "post-checkout";
 406                         argv_array_pushl(&cp.args, absolute_path(hook),
 407                                          oid_to_hex(&null_oid),
 408                                          oid_to_hex(&commit->object.oid),
 409                                          "1", NULL);
 410                         ret = run_command(&cp);
 411                 }
 412         }
 413
 414         argv_array_clear(&child_env);
 415         strbuf_release(&sb);
 416         strbuf_release(&symref);
 417         strbuf_release(&sb_repo);
 418         strbuf_release(&sb_git);
 419         return ret;
 420 }
 421
 422 static void print_preparing_worktree_line(int detach,
 423                                           const char *branch,
 424                                           const char *new_branch,
 425                                           int force_new_branch)
 426 {
 427         if (force_new_branch) {
 428                 struct commit *commit = lookup_commit_reference_by_name(new_branch);
 429                 if (!commit)
 430                         printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 431                 else
 432                         printf_ln(_("Preparing worktree (resetting branch '%s'; was at %s)"),
 433                                   new_branch,
 434                                   find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 435         } else if (new_branch) {
 436                 printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 437         } else {
 438                 struct strbuf s = STRBUF_INIT;
 439                 if (!detach && !strbuf_check_branch_ref(&s, branch) &&
 440                     ref_exists(s.buf))
 441                         printf_ln(_("Preparing worktree (checking out '%s')"),
 442                                   branch);
 443                 else {
 444                         struct commit *commit = lookup_commit_reference_by_name(branch);
 445                         if (!commit)
 446                                 die(_("invalid reference: %s"), branch);
 447                         printf_ln(_("Preparing worktree (detached HEAD %s)"),
 448                                   find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 449                 }
 450                 strbuf_release(&s);
 451         }
 452 }
 453
 454 static const char *dwim_branch(const char *path, const char **new_branch)
 455 {
 456         int n;
 457         const char *s = worktree_basename(path, &n);
 458         const char *branchname = xstrndup(s, n);
 459         struct strbuf ref = STRBUF_INIT;
 460
 461         UNLEAK(branchname);
 462         if (!strbuf_check_branch_ref(&ref, branchname) &&
 463             ref_exists(ref.buf)) {
 464                 strbuf_release(&ref);
 465                 return branchname;
 466         }
 467
 468         *new_branch = branchname;
 469         if (guess_remote) {
 470                 struct object_id oid;
 471                 const char *remote =
 472                         unique_tracking_name(*new_branch, &oid, NULL);
 473                 return remote;
 474         }
 475         return NULL;
 476 }
 477
 478 static int add(int ac, const char **av, const char *prefix)
 479 {
 480         struct add_opts opts;
 481         const char *new_branch_force = NULL;
 482         char *path;
 483         const char *branch;
 484         const char *new_branch = NULL;
 485         const char *opt_track = NULL;
 486         struct option options[] = {
 487                 OPT__FORCE(&opts.force,
 488                            N_("checkout <branch> even if already checked out in other worktree"),
 489                            PARSE_OPT_NOCOMPLETE),
 490                 OPT_STRING('b', NULL, &new_branch, N_("branch"),
 491                            N_("create a new branch")),
 492                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 493                            N_("create or reset a branch")),
 494                 OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 495                 OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 496                 OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
 497                 OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
 498                 OPT_PASSTHRU(0, "track", &opt_track, NULL,
 499                              N_("set up tracking mode (see git-branch(1))"),
 500                              PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
 501                 OPT_BOOL(0, "guess-remote", &guess_remote,
 502                          N_("try to match the new branch name with a remote-tracking branch")),
 503                 OPT_END()
 504         };
 505
 506         memset(&opts, 0, sizeof(opts));
 507         opts.checkout = 1;
 508         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 509         if (!!opts.detach + !!new_branch + !!new_branch_force > 1)
 510                 die(_("-b, -B, and --detach are mutually exclusive"));
 511         if (ac < 1 || ac > 2)
 512                 usage_with_options(worktree_usage, options);
 513
 514         path = prefix_filename(prefix, av[0]);
 515         branch = ac < 2 ? "HEAD" : av[1];
 516
 517         if (!strcmp(branch, "-"))
 518                 branch = "@{-1}";
 519
 520         if (new_branch_force) {
 521                 struct strbuf symref = STRBUF_INIT;
 522
 523                 new_branch = new_branch_force;
 524
 525                 if (!opts.force &&
 526                     !strbuf_check_branch_ref(&symref, new_branch) &&
 527                     ref_exists(symref.buf))
 528                         die_if_checked_out(symref.buf, 0);
 529                 strbuf_release(&symref);
 530         }
 531
 532         if (ac < 2 && !new_branch && !opts.detach) {
 533                 const char *s = dwim_branch(path, &new_branch);
 534                 if (s)
 535                         branch = s;
 536         }
 537
 538         if (ac == 2 && !new_branch && !opts.detach) {
 539                 struct object_id oid;
 540                 struct commit *commit;
 541                 const char *remote;
 542
 543                 commit = lookup_commit_reference_by_name(branch);
 544                 if (!commit) {
 545                         remote = unique_tracking_name(branch, &oid, NULL);
 546                         if (remote) {
 547                                 new_branch = branch;
 548                                 branch = remote;
 549                         }
 550                 }
 551         }
 552         if (!opts.quiet)
 553                 print_preparing_worktree_line(opts.detach, branch, new_branch, !!new_branch_force);
 554
 555         if (new_branch) {
 556                 struct child_process cp = CHILD_PROCESS_INIT;
 557                 cp.git_cmd = 1;
 558                 argv_array_push(&cp.args, "branch");
 559                 if (new_branch_force)
 560                         argv_array_push(&cp.args, "--force");
 561                 if (opts.quiet)
 562                         argv_array_push(&cp.args, "--quiet");
 563                 argv_array_push(&cp.args, new_branch);
 564                 argv_array_push(&cp.args, branch);
 565                 if (opt_track)
 566                         argv_array_push(&cp.args, opt_track);
 567                 if (run_command(&cp))
 568                         return -1;
 569                 branch = new_branch;
 570         } else if (opt_track) {
 571                 die(_("--[no-]track can only be used if a new branch is created"));
 572         }
 573
 574         UNLEAK(path);
 575         UNLEAK(opts);
 576         return add_worktree(path, branch, &opts);
 577 }
 578
 579 static void show_worktree_porcelain(struct worktree *wt)
 580 {
 581         printf("worktree %s\n", wt->path);
 582         if (wt->is_bare)
 583                 printf("bare\n");
 584         else {
 585                 printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
 586                 if (wt->is_detached)
 587                         printf("detached\n");
 588                 else if (wt->head_ref)
 589                         printf("branch %s\n", wt->head_ref);
 590         }
 591         printf("\n");
 592 }
 593
 594 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 595 {
 596         struct strbuf sb = STRBUF_INIT;
 597         int cur_path_len = strlen(wt->path);
 598         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 599
 600         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 601         if (wt->is_bare)
 602                 strbuf_addstr(&sb, "(bare)");
 603         else {
 604                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 605                                 find_unique_abbrev(&wt->head_oid, DEFAULT_ABBREV));
 606                 if (wt->is_detached)
 607                         strbuf_addstr(&sb, "(detached HEAD)");
 608                 else if (wt->head_ref) {
 609                         char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
 610                         strbuf_addf(&sb, "[%s]", ref);
 611                         free(ref);
 612                 } else
 613                         strbuf_addstr(&sb, "(error)");
 614         }
 615         printf("%s\n", sb.buf);
 616
 617         strbuf_release(&sb);
 618 }
 619
 620 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 621 {
 622         int i;
 623
 624         for (i = 0; wt[i]; i++) {
 625                 int sha1_len;
 626                 int path_len = strlen(wt[i]->path);
 627
 628                 if (path_len > *maxlen)
 629                         *maxlen = path_len;
 630                 sha1_len = strlen(find_unique_abbrev(&wt[i]->head_oid, *abbrev));
 631                 if (sha1_len > *abbrev)
 632                         *abbrev = sha1_len;
 633         }
 634 }
 635
 636 static int list(int ac, const char **av, const char *prefix)
 637 {
 638         int porcelain = 0;
 639
 640         struct option options[] = {
 641                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 642                 OPT_END()
 643         };
 644
 645         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 646         if (ac)
 647                 usage_with_options(worktree_usage, options);
 648         else {
 649                 struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
 650                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 651
 652                 if (!porcelain)
 653                         measure_widths(worktrees, &abbrev, &path_maxlen);
 654
 655                 for (i = 0; worktrees[i]; i++) {
 656                         if (porcelain)
 657                                 show_worktree_porcelain(worktrees[i]);
 658                         else
 659                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 660                 }
 661                 free_worktrees(worktrees);
 662         }
 663         return 0;
 664 }
 665
 666 static int lock_worktree(int ac, const char **av, const char *prefix)
 667 {
 668         const char *reason = "", *old_reason;
 669         struct option options[] = {
 670                 OPT_STRING(0, "reason", &reason, N_("string"),
 671                            N_("reason for locking")),
 672                 OPT_END()
 673         };
 674         struct worktree **worktrees, *wt;
 675
 676         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 677         if (ac != 1)
 678                 usage_with_options(worktree_usage, options);
 679
 680         worktrees = get_worktrees(0);
 681         wt = find_worktree(worktrees, prefix, av[0]);
 682         if (!wt)
 683                 die(_("'%s' is not a working tree"), av[0]);
 684         if (is_main_worktree(wt))
 685                 die(_("The main working tree cannot be locked or unlocked"));
 686
 687         old_reason = worktree_lock_reason(wt);
 688         if (old_reason) {
 689                 if (*old_reason)
 690                         die(_("'%s' is already locked, reason: %s"),
 691                             av[0], old_reason);
 692                 die(_("'%s' is already locked"), av[0]);
 693         }
 694
 695         write_file(git_common_path("worktrees/%s/locked", wt->id),
 696                    "%s", reason);
 697         free_worktrees(worktrees);
 698         return 0;
 699 }
 700
 701 static int unlock_worktree(int ac, const char **av, const char *prefix)
 702 {
 703         struct option options[] = {
 704                 OPT_END()
 705         };
 706         struct worktree **worktrees, *wt;
 707         int ret;
 708
 709         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 710         if (ac != 1)
 711                 usage_with_options(worktree_usage, options);
 712
 713         worktrees = get_worktrees(0);
 714         wt = find_worktree(worktrees, prefix, av[0]);
 715         if (!wt)
 716                 die(_("'%s' is not a working tree"), av[0]);
 717         if (is_main_worktree(wt))
 718                 die(_("The main working tree cannot be locked or unlocked"));
 719         if (!worktree_lock_reason(wt))
 720                 die(_("'%s' is not locked"), av[0]);
 721         ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 722         free_worktrees(worktrees);
 723         return ret;
 724 }
 725
 726 static void validate_no_submodules(const struct worktree *wt)
 727 {
 728         struct index_state istate = { NULL };
 729         struct strbuf path = STRBUF_INIT;
 730         int i, found_submodules = 0;
 731
 732         if (is_directory(worktree_git_path(wt, "modules"))) {
 733                 /*
 734                  * There could be false positives, e.g. the "modules"
 735                  * directory exists but is empty. But it's a rare case and
 736                  * this simpler check is probably good enough for now.
 737                  */
 738                 found_submodules = 1;
 739         } else if (read_index_from(&istate, worktree_git_path(wt, "index"),
 740                                    get_worktree_git_dir(wt)) > 0) {
 741                 for (i = 0; i < istate.cache_nr; i++) {
 742                         struct cache_entry *ce = istate.cache[i];
 743                         int err;
 744
 745                         if (!S_ISGITLINK(ce->ce_mode))
 746                                 continue;
 747
 748                         strbuf_reset(&path);
 749                         strbuf_addf(&path, "%s/%s", wt->path, ce->name);
 750                         if (!is_submodule_populated_gently(path.buf, &err))
 751                                 continue;
 752
 753                         found_submodules = 1;
 754                         break;
 755                 }
 756         }
 757         discard_index(&istate);
 758         strbuf_release(&path);
 759
 760         if (found_submodules)
 761                 die(_("working trees containing submodules cannot be moved or removed"));
 762 }
 763
 764 static int move_worktree(int ac, const char **av, const char *prefix)
 765 {
 766         int force = 0;
 767         struct option options[] = {
 768                 OPT__FORCE(&force,
 769                          N_("force move even if worktree is dirty or locked"),
 770                          PARSE_OPT_NOCOMPLETE),
 771                 OPT_END()
 772         };
 773         struct worktree **worktrees, *wt;
 774         struct strbuf dst = STRBUF_INIT;
 775         struct strbuf errmsg = STRBUF_INIT;
 776         const char *reason = NULL;
 777         char *path;
 778
 779         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 780         if (ac != 2)
 781                 usage_with_options(worktree_usage, options);
 782
 783         path = prefix_filename(prefix, av[1]);
 784         strbuf_addstr(&dst, path);
 785         free(path);
 786
 787         worktrees = get_worktrees(0);
 788         wt = find_worktree(worktrees, prefix, av[0]);
 789         if (!wt)
 790                 die(_("'%s' is not a working tree"), av[0]);
 791         if (is_main_worktree(wt))
 792                 die(_("'%s' is a main working tree"), av[0]);
 793         if (is_directory(dst.buf)) {
 794                 const char *sep = find_last_dir_sep(wt->path);
 795
 796                 if (!sep)
 797                         die(_("could not figure out destination name from '%s'"),
 798                             wt->path);
 799                 strbuf_trim_trailing_dir_sep(&dst);
 800                 strbuf_addstr(&dst, sep);
 801         }
 802         if (file_exists(dst.buf))
 803                 die(_("target '%s' already exists"), dst.buf);
 804
 805         validate_no_submodules(wt);
 806
 807         if (force < 2)
 808                 reason = worktree_lock_reason(wt);
 809         if (reason) {
 810                 if (*reason)
 811                         die(_("cannot move a locked working tree, lock reason: %s\nuse 'move -f -f' to override or unlock first"),
 812                             reason);
 813                 die(_("cannot move a locked working tree;\nuse 'move -f -f' to override or unlock first"));
 814         }
 815         if (validate_worktree(wt, &errmsg, 0))
 816                 die(_("validation failed, cannot move working tree: %s"),
 817                     errmsg.buf);
 818         strbuf_release(&errmsg);
 819
 820         if (rename(wt->path, dst.buf) == -1)
 821                 die_errno(_("failed to move '%s' to '%s'"), wt->path, dst.buf);
 822
 823         update_worktree_location(wt, dst.buf);
 824
 825         strbuf_release(&dst);
 826         free_worktrees(worktrees);
 827         return 0;
 828 }
 829
 830 /*
 831  * Note, "git status --porcelain" is used to determine if it's safe to
 832  * delete a whole worktree. "git status" does not ignore user
 833  * configuration, so if a normal "git status" shows "clean" for the
 834  * user, then it's ok to remove it.
 835  *
 836  * This assumption may be a bad one. We may want to ignore
 837  * (potentially bad) user settings and only delete a worktree when
 838  * it's absolutely safe to do so from _our_ point of view because we
 839  * know better.
 840  */
 841 static void check_clean_worktree(struct worktree *wt,
 842                                  const char *original_path)
 843 {
 844         struct argv_array child_env = ARGV_ARRAY_INIT;
 845         struct child_process cp;
 846         char buf[1];
 847         int ret;
 848
 849         /*
 850          * Until we sort this out, all submodules are "dirty" and
 851          * will abort this function.
 852          */
 853         validate_no_submodules(wt);
 854
 855         argv_array_pushf(&child_env, "%s=%s/.git",
 856                          GIT_DIR_ENVIRONMENT, wt->path);
 857         argv_array_pushf(&child_env, "%s=%s",
 858                          GIT_WORK_TREE_ENVIRONMENT, wt->path);
 859         memset(&cp, 0, sizeof(cp));
 860         argv_array_pushl(&cp.args, "status",
 861                          "--porcelain", "--ignore-submodules=none",
 862                          NULL);
 863         cp.env = child_env.argv;
 864         cp.git_cmd = 1;
 865         cp.dir = wt->path;
 866         cp.out = -1;
 867         ret = start_command(&cp);
 868         if (ret)
 869                 die_errno(_("failed to run 'git status' on '%s'"),
 870                           original_path);
 871         ret = xread(cp.out, buf, sizeof(buf));
 872         if (ret)
 873                 die(_("'%s' is dirty, use --force to delete it"),
 874                     original_path);
 875         close(cp.out);
 876         ret = finish_command(&cp);
 877         if (ret)
 878                 die_errno(_("failed to run 'git status' on '%s', code %d"),
 879                           original_path, ret);
 880 }
 881
 882 static int delete_git_work_tree(struct worktree *wt)
 883 {
 884         struct strbuf sb = STRBUF_INIT;
 885         int ret = 0;
 886
 887         strbuf_addstr(&sb, wt->path);
 888         if (remove_dir_recursively(&sb, 0)) {
 889                 error_errno(_("failed to delete '%s'"), sb.buf);
 890                 ret = -1;
 891         }
 892         strbuf_release(&sb);
 893         return ret;
 894 }
 895
 896 static int remove_worktree(int ac, const char **av, const char *prefix)
 897 {
 898         int force = 0;
 899         struct option options[] = {
 900                 OPT__FORCE(&force,
 901                          N_("force removal even if worktree is dirty or locked"),
 902                          PARSE_OPT_NOCOMPLETE),
 903                 OPT_END()
 904         };
 905         struct worktree **worktrees, *wt;
 906         struct strbuf errmsg = STRBUF_INIT;
 907         const char *reason = NULL;
 908         int ret = 0;
 909
 910         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 911         if (ac != 1)
 912                 usage_with_options(worktree_usage, options);
 913
 914         worktrees = get_worktrees(0);
 915         wt = find_worktree(worktrees, prefix, av[0]);
 916         if (!wt)
 917                 die(_("'%s' is not a working tree"), av[0]);
 918         if (is_main_worktree(wt))
 919                 die(_("'%s' is a main working tree"), av[0]);
 920         if (force < 2)
 921                 reason = worktree_lock_reason(wt);
 922         if (reason) {
 923                 if (*reason)
 924                         die(_("cannot remove a locked working tree, lock reason: %s\nuse 'remove -f -f' to override or unlock first"),
 925                             reason);
 926                 die(_("cannot remove a locked working tree;\nuse 'remove -f -f' to override or unlock first"));
 927         }
 928         if (validate_worktree(wt, &errmsg, WT_VALIDATE_WORKTREE_MISSING_OK))
 929                 die(_("validation failed, cannot remove working tree: %s"),
 930                     errmsg.buf);
 931         strbuf_release(&errmsg);
 932
 933         if (file_exists(wt->path)) {
 934                 if (!force)
 935                         check_clean_worktree(wt, av[0]);
 936
 937                 ret |= delete_git_work_tree(wt);
 938         }
 939         /*
 940          * continue on even if ret is non-zero, there's no going back
 941          * from here.
 942          */
 943         ret |= delete_git_dir(wt->id);
 944         delete_worktrees_dir_if_empty();
 945
 946         free_worktrees(worktrees);
 947         return ret;
 948 }
 949
 950 int cmd_worktree(int ac, const char **av, const char *prefix)
 951 {
 952         struct option options[] = {
 953                 OPT_END()
 954         };
 955
 956         git_config(git_worktree_config, NULL);
 957
 958         if (ac < 2)
 959                 usage_with_options(worktree_usage, options);
 960         if (!prefix)
 961                 prefix = "";
 962         if (!strcmp(av[1], "add"))
 963                 return add(ac - 1, av + 1, prefix);
 964         if (!strcmp(av[1], "prune"))
 965                 return prune(ac - 1, av + 1, prefix);
 966         if (!strcmp(av[1], "list"))
 967                 return list(ac - 1, av + 1, prefix);
 968         if (!strcmp(av[1], "lock"))
 969                 return lock_worktree(ac - 1, av + 1, prefix);
 970         if (!strcmp(av[1], "unlock"))
 971                 return unlock_worktree(ac - 1, av + 1, prefix);
 972         if (!strcmp(av[1], "move"))
 973                 return move_worktree(ac - 1, av + 1, prefix);
 974         if (!strcmp(av[1], "remove"))
 975                 return remove_worktree(ac - 1, av + 1, prefix);
 976         usage_with_options(worktree_usage, options);
 977 }