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