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