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 child_process cp = CHILD_PROCESS_INIT;
 272         struct argv_array child_env = ARGV_ARRAY_INIT;
 273         unsigned int counter = 0;
 274         int 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
 299         while (mkdir(sb_repo.buf, 0777)) {
 300                 counter++;
 301                 if ((errno != EEXIST) || !counter /* overflow */)
 302                         die_errno(_("could not create directory of '%s'"),
 303                                   sb_repo.buf);
 304                 strbuf_setlen(&sb_repo, len);
 305                 strbuf_addf(&sb_repo, "%d", counter);
 306         }
 307         name = strrchr(sb_repo.buf, '/') + 1;
 308
 309         junk_pid = getpid();
 310         atexit(remove_junk);
 311         sigchain_push_common(remove_junk_on_signal);
 312
 313         junk_git_dir = xstrdup(sb_repo.buf);
 314         is_junk = 1;
 315
 316         /*
 317          * lock the incomplete repo so prune won't delete it, unlock
 318          * after the preparation is over.
 319          */
 320         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 321         if (!opts->keep_locked)
 322                 write_file(sb.buf, "initializing");
 323         else
 324                 write_file(sb.buf, "added with --lock");
 325
 326         strbuf_addf(&sb_git, "%s/.git", path);
 327         if (safe_create_leading_directories_const(sb_git.buf))
 328                 die_errno(_("could not create leading directories of '%s'"),
 329                           sb_git.buf);
 330         junk_work_tree = xstrdup(path);
 331
 332         strbuf_reset(&sb);
 333         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 334         write_file(sb.buf, "%s", real_path(sb_git.buf));
 335         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 336                    real_path(get_git_common_dir()), name);
 337         /*
 338          * This is to keep resolve_ref() happy. We need a valid HEAD
 339          * or is_git_directory() will reject the directory. Any value which
 340          * looks like an object ID will do since it will be immediately
 341          * replaced by the symbolic-ref or update-ref invocation in the new
 342          * worktree.
 343          */
 344         strbuf_reset(&sb);
 345         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 346         write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
 347         strbuf_reset(&sb);
 348         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 349         write_file(sb.buf, "../..");
 350
 351         argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 352         argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 353         cp.git_cmd = 1;
 354
 355         if (!is_branch)
 356                 argv_array_pushl(&cp.args, "update-ref", "HEAD",
 357                                  oid_to_hex(&commit->object.oid), NULL);
 358         else {
 359                 argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 360                                  symref.buf, NULL);
 361                 if (opts->quiet)
 362                         argv_array_push(&cp.args, "--quiet");
 363         }
 364
 365         cp.env = child_env.argv;
 366         ret = run_command(&cp);
 367         if (ret)
 368                 goto done;
 369
 370         if (opts->checkout) {
 371                 cp.argv = NULL;
 372                 argv_array_clear(&cp.args);
 373                 argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 374                 if (opts->quiet)
 375                         argv_array_push(&cp.args, "--quiet");
 376                 cp.env = child_env.argv;
 377                 ret = run_command(&cp);
 378                 if (ret)
 379                         goto done;
 380         }
 381
 382         is_junk = 0;
 383         FREE_AND_NULL(junk_work_tree);
 384         FREE_AND_NULL(junk_git_dir);
 385
 386 done:
 387         if (ret || !opts->keep_locked) {
 388                 strbuf_reset(&sb);
 389                 strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 390                 unlink_or_warn(sb.buf);
 391         }
 392
 393         /*
 394          * Hook failure does not warrant worktree deletion, so run hook after
 395          * is_junk is cleared, but do return appropriate code when hook fails.
 396          */
 397         if (!ret && opts->checkout) {
 398                 const char *hook = find_hook("post-checkout");
 399                 if (hook) {
 400                         const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
 401                         cp.git_cmd = 0;
 402                         cp.no_stdin = 1;
 403                         cp.stdout_to_stderr = 1;
 404                         cp.dir = path;
 405                         cp.env = env;
 406                         cp.argv = NULL;
 407                         argv_array_pushl(&cp.args, absolute_path(hook),
 408                                          oid_to_hex(&null_oid),
 409                                          oid_to_hex(&commit->object.oid),
 410                                          "1", NULL);
 411                         ret = run_command(&cp);
 412                 }
 413         }
 414
 415         argv_array_clear(&child_env);
 416         strbuf_release(&sb);
 417         strbuf_release(&symref);
 418         strbuf_release(&sb_repo);
 419         strbuf_release(&sb_git);
 420         return ret;
 421 }
 422
 423 static void print_preparing_worktree_line(int detach,
 424                                           const char *branch,
 425                                           const char *new_branch,
 426                                           int force_new_branch)
 427 {
 428         if (force_new_branch) {
 429                 struct commit *commit = lookup_commit_reference_by_name(new_branch);
 430                 if (!commit)
 431                         printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 432                 else
 433                         printf_ln(_("Preparing worktree (resetting branch '%s'; was at %s)"),
 434                                   new_branch,
 435                                   find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 436         } else if (new_branch) {
 437                 printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 438         } else {
 439                 struct strbuf s = STRBUF_INIT;
 440                 if (!detach && !strbuf_check_branch_ref(&s, branch) &&
 441                     ref_exists(s.buf))
 442                         printf_ln(_("Preparing worktree (checking out '%s')"),
 443                                   branch);
 444                 else {
 445                         struct commit *commit = lookup_commit_reference_by_name(branch);
 446                         if (!commit)
 447                                 die(_("invalid reference: %s"), branch);
 448                         printf_ln(_("Preparing worktree (detached HEAD %s)"),
 449                                   find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 450                 }
 451                 strbuf_release(&s);
 452         }
 453 }
 454
 455 static const char *dwim_branch(const char *path, const char **new_branch)
 456 {
 457         int n;
 458         const char *s = worktree_basename(path, &n);
 459         const char *branchname = xstrndup(s, n);
 460         struct strbuf ref = STRBUF_INIT;
 461
 462         UNLEAK(branchname);
 463         if (!strbuf_check_branch_ref(&ref, branchname) &&
 464             ref_exists(ref.buf)) {
 465                 strbuf_release(&ref);
 466                 return branchname;
 467         }
 468
 469         *new_branch = branchname;
 470         if (guess_remote) {
 471                 struct object_id oid;
 472                 const char *remote =
 473                         unique_tracking_name(*new_branch, &oid, NULL);
 474                 return remote;
 475         }
 476         return NULL;
 477 }
 478
 479 static int add(int ac, const char **av, const char *prefix)
 480 {
 481         struct add_opts opts;
 482         const char *new_branch_force = NULL;
 483         char *path;
 484         const char *branch;
 485         const char *new_branch = NULL;
 486         const char *opt_track = NULL;
 487         struct option options[] = {
 488                 OPT__FORCE(&opts.force,
 489                            N_("checkout <branch> even if already checked out in other worktree"),
 490                            PARSE_OPT_NOCOMPLETE),
 491                 OPT_STRING('b', NULL, &new_branch, N_("branch"),
 492                            N_("create a new branch")),
 493                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 494                            N_("create or reset a branch")),
 495                 OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 496                 OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 497                 OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
 498                 OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
 499                 OPT_PASSTHRU(0, "track", &opt_track, NULL,
 500                              N_("set up tracking mode (see git-branch(1))"),
 501                              PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
 502                 OPT_BOOL(0, "guess-remote", &guess_remote,
 503                          N_("try to match the new branch name with a remote-tracking branch")),
 504                 OPT_END()
 505         };
 506
 507         memset(&opts, 0, sizeof(opts));
 508         opts.checkout = 1;
 509         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 510         if (!!opts.detach + !!new_branch + !!new_branch_force > 1)
 511                 die(_("-b, -B, and --detach are mutually exclusive"));
 512         if (ac < 1 || ac > 2)
 513                 usage_with_options(worktree_usage, options);
 514
 515         path = prefix_filename(prefix, av[0]);
 516         branch = ac < 2 ? "HEAD" : av[1];
 517
 518         if (!strcmp(branch, "-"))
 519                 branch = "@{-1}";
 520
 521         if (new_branch_force) {
 522                 struct strbuf symref = STRBUF_INIT;
 523
 524                 new_branch = new_branch_force;
 525
 526                 if (!opts.force &&
 527                     !strbuf_check_branch_ref(&symref, new_branch) &&
 528                     ref_exists(symref.buf))
 529                         die_if_checked_out(symref.buf, 0);
 530                 strbuf_release(&symref);
 531         }
 532
 533         if (ac < 2 && !new_branch && !opts.detach) {
 534                 const char *s = dwim_branch(path, &new_branch);
 535                 if (s)
 536                         branch = s;
 537         }
 538
 539         if (ac == 2 && !new_branch && !opts.detach) {
 540                 struct object_id oid;
 541                 struct commit *commit;
 542                 const char *remote;
 543
 544                 commit = lookup_commit_reference_by_name(branch);
 545                 if (!commit) {
 546                         remote = unique_tracking_name(branch, &oid, NULL);
 547                         if (remote) {
 548                                 new_branch = branch;
 549                                 branch = remote;
 550                         }
 551                 }
 552         }
 553         if (!opts.quiet)
 554                 print_preparing_worktree_line(opts.detach, branch, new_branch, !!new_branch_force);
 555
 556         if (new_branch) {
 557                 struct child_process cp = CHILD_PROCESS_INIT;
 558                 cp.git_cmd = 1;
 559                 argv_array_push(&cp.args, "branch");
 560                 if (new_branch_force)
 561                         argv_array_push(&cp.args, "--force");
 562                 if (opts.quiet)
 563                         argv_array_push(&cp.args, "--quiet");
 564                 argv_array_push(&cp.args, new_branch);
 565                 argv_array_push(&cp.args, branch);
 566                 if (opt_track)
 567                         argv_array_push(&cp.args, opt_track);
 568                 if (run_command(&cp))
 569                         return -1;
 570                 branch = new_branch;
 571         } else if (opt_track) {
 572                 die(_("--[no-]track can only be used if a new branch is created"));
 573         }
 574
 575         UNLEAK(path);
 576         UNLEAK(opts);
 577         return add_worktree(path, branch, &opts);
 578 }
 579
 580 static void show_worktree_porcelain(struct worktree *wt)
 581 {
 582         printf("worktree %s\n", wt->path);
 583         if (wt->is_bare)
 584                 printf("bare\n");
 585         else {
 586                 printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
 587                 if (wt->is_detached)
 588                         printf("detached\n");
 589                 else if (wt->head_ref)
 590                         printf("branch %s\n", wt->head_ref);
 591         }
 592         printf("\n");
 593 }
 594
 595 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 596 {
 597         struct strbuf sb = STRBUF_INIT;
 598         int cur_path_len = strlen(wt->path);
 599         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 600
 601         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 602         if (wt->is_bare)
 603                 strbuf_addstr(&sb, "(bare)");
 604         else {
 605                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 606                                 find_unique_abbrev(&wt->head_oid, DEFAULT_ABBREV));
 607                 if (wt->is_detached)
 608                         strbuf_addstr(&sb, "(detached HEAD)");
 609                 else if (wt->head_ref) {
 610                         char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
 611                         strbuf_addf(&sb, "[%s]", ref);
 612                         free(ref);
 613                 } else
 614                         strbuf_addstr(&sb, "(error)");
 615         }
 616         printf("%s\n", sb.buf);
 617
 618         strbuf_release(&sb);
 619 }
 620
 621 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 622 {
 623         int i;
 624
 625         for (i = 0; wt[i]; i++) {
 626                 int sha1_len;
 627                 int path_len = strlen(wt[i]->path);
 628
 629                 if (path_len > *maxlen)
 630                         *maxlen = path_len;
 631                 sha1_len = strlen(find_unique_abbrev(&wt[i]->head_oid, *abbrev));
 632                 if (sha1_len > *abbrev)
 633                         *abbrev = sha1_len;
 634         }
 635 }
 636
 637 static int list(int ac, const char **av, const char *prefix)
 638 {
 639         int porcelain = 0;
 640
 641         struct option options[] = {
 642                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 643                 OPT_END()
 644         };
 645
 646         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 647         if (ac)
 648                 usage_with_options(worktree_usage, options);
 649         else {
 650                 struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
 651                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 652
 653                 if (!porcelain)
 654                         measure_widths(worktrees, &abbrev, &path_maxlen);
 655
 656                 for (i = 0; worktrees[i]; i++) {
 657                         if (porcelain)
 658                                 show_worktree_porcelain(worktrees[i]);
 659                         else
 660                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 661                 }
 662                 free_worktrees(worktrees);
 663         }
 664         return 0;
 665 }
 666
 667 static int lock_worktree(int ac, const char **av, const char *prefix)
 668 {
 669         const char *reason = "", *old_reason;
 670         struct option options[] = {
 671                 OPT_STRING(0, "reason", &reason, N_("string"),
 672                            N_("reason for locking")),
 673                 OPT_END()
 674         };
 675         struct worktree **worktrees, *wt;
 676
 677         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 678         if (ac != 1)
 679                 usage_with_options(worktree_usage, options);
 680
 681         worktrees = get_worktrees(0);
 682         wt = find_worktree(worktrees, prefix, av[0]);
 683         if (!wt)
 684                 die(_("'%s' is not a working tree"), av[0]);
 685         if (is_main_worktree(wt))
 686                 die(_("The main working tree cannot be locked or unlocked"));
 687
 688         old_reason = worktree_lock_reason(wt);
 689         if (old_reason) {
 690                 if (*old_reason)
 691                         die(_("'%s' is already locked, reason: %s"),
 692                             av[0], old_reason);
 693                 die(_("'%s' is already locked"), av[0]);
 694         }
 695
 696         write_file(git_common_path("worktrees/%s/locked", wt->id),
 697                    "%s", reason);
 698         free_worktrees(worktrees);
 699         return 0;
 700 }
 701
 702 static int unlock_worktree(int ac, const char **av, const char *prefix)
 703 {
 704         struct option options[] = {
 705                 OPT_END()
 706         };
 707         struct worktree **worktrees, *wt;
 708         int ret;
 709
 710         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 711         if (ac != 1)
 712                 usage_with_options(worktree_usage, options);
 713
 714         worktrees = get_worktrees(0);
 715         wt = find_worktree(worktrees, prefix, av[0]);
 716         if (!wt)
 717                 die(_("'%s' is not a working tree"), av[0]);
 718         if (is_main_worktree(wt))
 719                 die(_("The main working tree cannot be locked or unlocked"));
 720         if (!worktree_lock_reason(wt))
 721                 die(_("'%s' is not locked"), av[0]);
 722         ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 723         free_worktrees(worktrees);
 724         return ret;
 725 }
 726
 727 static void validate_no_submodules(const struct worktree *wt)
 728 {
 729         struct index_state istate = { NULL };
 730         struct strbuf path = STRBUF_INIT;
 731         int i, found_submodules = 0;
 732
 733         if (is_directory(worktree_git_path(wt, "modules"))) {
 734                 /*
 735                  * There could be false positives, e.g. the "modules"
 736                  * directory exists but is empty. But it's a rare case and
 737                  * this simpler check is probably good enough for now.
 738                  */
 739                 found_submodules = 1;
 740         } else if (read_index_from(&istate, worktree_git_path(wt, "index"),
 741                                    get_worktree_git_dir(wt)) > 0) {
 742                 for (i = 0; i < istate.cache_nr; i++) {
 743                         struct cache_entry *ce = istate.cache[i];
 744                         int err;
 745
 746                         if (!S_ISGITLINK(ce->ce_mode))
 747                                 continue;
 748
 749                         strbuf_reset(&path);
 750                         strbuf_addf(&path, "%s/%s", wt->path, ce->name);
 751                         if (!is_submodule_populated_gently(path.buf, &err))
 752                                 continue;
 753
 754                         found_submodules = 1;
 755                         break;
 756                 }
 757         }
 758         discard_index(&istate);
 759         strbuf_release(&path);
 760
 761         if (found_submodules)
 762                 die(_("working trees containing submodules cannot be moved or removed"));
 763 }
 764
 765 static int move_worktree(int ac, const char **av, const char *prefix)
 766 {
 767         int force = 0;
 768         struct option options[] = {
 769                 OPT__FORCE(&force,
 770                          N_("force move even if worktree is dirty or locked"),
 771                          PARSE_OPT_NOCOMPLETE),
 772                 OPT_END()
 773         };
 774         struct worktree **worktrees, *wt;
 775         struct strbuf dst = STRBUF_INIT;
 776         struct strbuf errmsg = STRBUF_INIT;
 777         const char *reason = NULL;
 778         char *path;
 779
 780         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 781         if (ac != 2)
 782                 usage_with_options(worktree_usage, options);
 783
 784         path = prefix_filename(prefix, av[1]);
 785         strbuf_addstr(&dst, path);
 786         free(path);
 787
 788         worktrees = get_worktrees(0);
 789         wt = find_worktree(worktrees, prefix, av[0]);
 790         if (!wt)
 791                 die(_("'%s' is not a working tree"), av[0]);
 792         if (is_main_worktree(wt))
 793                 die(_("'%s' is a main working tree"), av[0]);
 794         if (is_directory(dst.buf)) {
 795                 const char *sep = find_last_dir_sep(wt->path);
 796
 797                 if (!sep)
 798                         die(_("could not figure out destination name from '%s'"),
 799                             wt->path);
 800                 strbuf_trim_trailing_dir_sep(&dst);
 801                 strbuf_addstr(&dst, sep);
 802         }
 803         if (file_exists(dst.buf))
 804                 die(_("target '%s' already exists"), dst.buf);
 805
 806         validate_no_submodules(wt);
 807
 808         if (force < 2)
 809                 reason = worktree_lock_reason(wt);
 810         if (reason) {
 811                 if (*reason)
 812                         die(_("cannot move a locked working tree, lock reason: %s\nuse 'move -f -f' to override or unlock first"),
 813                             reason);
 814                 die(_("cannot move a locked working tree;\nuse 'move -f -f' to override or unlock first"));
 815         }
 816         if (validate_worktree(wt, &errmsg, 0))
 817                 die(_("validation failed, cannot move working tree: %s"),
 818                     errmsg.buf);
 819         strbuf_release(&errmsg);
 820
 821         if (rename(wt->path, dst.buf) == -1)
 822                 die_errno(_("failed to move '%s' to '%s'"), wt->path, dst.buf);
 823
 824         update_worktree_location(wt, dst.buf);
 825
 826         strbuf_release(&dst);
 827         free_worktrees(worktrees);
 828         return 0;
 829 }
 830
 831 /*
 832  * Note, "git status --porcelain" is used to determine if it's safe to
 833  * delete a whole worktree. "git status" does not ignore user
 834  * configuration, so if a normal "git status" shows "clean" for the
 835  * user, then it's ok to remove it.
 836  *
 837  * This assumption may be a bad one. We may want to ignore
 838  * (potentially bad) user settings and only delete a worktree when
 839  * it's absolutely safe to do so from _our_ point of view because we
 840  * know better.
 841  */
 842 static void check_clean_worktree(struct worktree *wt,
 843                                  const char *original_path)
 844 {
 845         struct argv_array child_env = ARGV_ARRAY_INIT;
 846         struct child_process cp;
 847         char buf[1];
 848         int ret;
 849
 850         /*
 851          * Until we sort this out, all submodules are "dirty" and
 852          * will abort this function.
 853          */
 854         validate_no_submodules(wt);
 855
 856         argv_array_pushf(&child_env, "%s=%s/.git",
 857                          GIT_DIR_ENVIRONMENT, wt->path);
 858         argv_array_pushf(&child_env, "%s=%s",
 859                          GIT_WORK_TREE_ENVIRONMENT, wt->path);
 860         memset(&cp, 0, sizeof(cp));
 861         argv_array_pushl(&cp.args, "status",
 862                          "--porcelain", "--ignore-submodules=none",
 863                          NULL);
 864         cp.env = child_env.argv;
 865         cp.git_cmd = 1;
 866         cp.dir = wt->path;
 867         cp.out = -1;
 868         ret = start_command(&cp);
 869         if (ret)
 870                 die_errno(_("failed to run 'git status' on '%s'"),
 871                           original_path);
 872         ret = xread(cp.out, buf, sizeof(buf));
 873         if (ret)
 874                 die(_("'%s' is dirty, use --force to delete it"),
 875                     original_path);
 876         close(cp.out);
 877         ret = finish_command(&cp);
 878         if (ret)
 879                 die_errno(_("failed to run 'git status' on '%s', code %d"),
 880                           original_path, ret);
 881 }
 882
 883 static int delete_git_work_tree(struct worktree *wt)
 884 {
 885         struct strbuf sb = STRBUF_INIT;
 886         int ret = 0;
 887
 888         strbuf_addstr(&sb, wt->path);
 889         if (remove_dir_recursively(&sb, 0)) {
 890                 error_errno(_("failed to delete '%s'"), sb.buf);
 891                 ret = -1;
 892         }
 893         strbuf_release(&sb);
 894         return ret;
 895 }
 896
 897 static int remove_worktree(int ac, const char **av, const char *prefix)
 898 {
 899         int force = 0;
 900         struct option options[] = {
 901                 OPT__FORCE(&force,
 902                          N_("force removal even if worktree is dirty or locked"),
 903                          PARSE_OPT_NOCOMPLETE),
 904                 OPT_END()
 905         };
 906         struct worktree **worktrees, *wt;
 907         struct strbuf errmsg = STRBUF_INIT;
 908         const char *reason = NULL;
 909         int ret = 0;
 910
 911         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 912         if (ac != 1)
 913                 usage_with_options(worktree_usage, options);
 914
 915         worktrees = get_worktrees(0);
 916         wt = find_worktree(worktrees, prefix, av[0]);
 917         if (!wt)
 918                 die(_("'%s' is not a working tree"), av[0]);
 919         if (is_main_worktree(wt))
 920                 die(_("'%s' is a main working tree"), av[0]);
 921         if (force < 2)
 922                 reason = worktree_lock_reason(wt);
 923         if (reason) {
 924                 if (*reason)
 925                         die(_("cannot remove a locked working tree, lock reason: %s\nuse 'remove -f -f' to override or unlock first"),
 926                             reason);
 927                 die(_("cannot remove a locked working tree;\nuse 'remove -f -f' to override or unlock first"));
 928         }
 929         if (validate_worktree(wt, &errmsg, WT_VALIDATE_WORKTREE_MISSING_OK))
 930                 die(_("validation failed, cannot remove working tree: %s"),
 931                     errmsg.buf);
 932         strbuf_release(&errmsg);
 933
 934         if (file_exists(wt->path)) {
 935                 if (!force)
 936                         check_clean_worktree(wt, av[0]);
 937
 938                 ret |= delete_git_work_tree(wt);
 939         }
 940         /*
 941          * continue on even if ret is non-zero, there's no going back
 942          * from here.
 943          */
 944         ret |= delete_git_dir(wt->id);
 945         delete_worktrees_dir_if_empty();
 946
 947         free_worktrees(worktrees);
 948         return ret;
 949 }
 950
 951 int cmd_worktree(int ac, const char **av, const char *prefix)
 952 {
 953         struct option options[] = {
 954                 OPT_END()
 955         };
 956
 957         git_config(git_worktree_config, NULL);
 958
 959         if (ac < 2)
 960                 usage_with_options(worktree_usage, options);
 961         if (!prefix)
 962                 prefix = "";
 963         if (!strcmp(av[1], "add"))
 964                 return add(ac - 1, av + 1, prefix);
 965         if (!strcmp(av[1], "prune"))
 966                 return prune(ac - 1, av + 1, prefix);
 967         if (!strcmp(av[1], "list"))
 968                 return list(ac - 1, av + 1, prefix);
 969         if (!strcmp(av[1], "lock"))
 970                 return lock_worktree(ac - 1, av + 1, prefix);
 971         if (!strcmp(av[1], "unlock"))
 972                 return unlock_worktree(ac - 1, av + 1, prefix);
 973         if (!strcmp(av[1], "move"))
 974                 return move_worktree(ac - 1, av + 1, prefix);
 975         if (!strcmp(av[1], "remove"))
 976                 return remove_worktree(ac - 1, av + 1, prefix);
 977         usage_with_options(worktree_usage, options);
 978 }