git.oblomov.eu Git - git/blob - 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 "strvec.h"
   8 #include "branch.h"
   9 #include "refs.h"
  10 #include "run-command.h"
  11 #include "sigchain.h"
  12 #include "submodule.h"
  13 #include "utf8.h"
  14 #include "worktree.h"
  15 #include "quote.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 void prune_worktree(const char *id, const char *reason)
  72 {
  73         if (show_only || verbose)
  74                 printf_ln(_("Removing %s/%s: %s"), "worktrees", id, reason);
  75         if (!show_only)
  76                 delete_git_dir(id);
  77 }
  78
  79 static int prune_cmp(const void *a, const void *b)
  80 {
  81         const struct string_list_item *x = a;
  82         const struct string_list_item *y = b;
  83         int c;
  84
  85         if ((c = fspathcmp(x->string, y->string)))
  86             return c;
  87         /*
  88          * paths same; prune_dupes() removes all but the first worktree entry
  89          * having the same path, so sort main worktree ('util' is NULL) above
  90          * linked worktrees ('util' not NULL) since main worktree can't be
  91          * removed
  92          */
  93         if (!x->util)
  94                 return -1;
  95         if (!y->util)
  96                 return 1;
  97         /* paths same; sort by .git/worktrees/<id> */
  98         return strcmp(x->util, y->util);
  99 }
 100
 101 static void prune_dups(struct string_list *l)
 102 {
 103         int i;
 104
 105         QSORT(l->items, l->nr, prune_cmp);
 106         for (i = 1; i < l->nr; i++) {
 107                 if (!fspathcmp(l->items[i].string, l->items[i - 1].string))
 108                         prune_worktree(l->items[i].util, "duplicate entry");
 109         }
 110 }
 111
 112 static void prune_worktrees(void)
 113 {
 114         struct strbuf reason = STRBUF_INIT;
 115         struct strbuf main_path = STRBUF_INIT;
 116         struct string_list kept = STRING_LIST_INIT_NODUP;
 117         DIR *dir = opendir(git_path("worktrees"));
 118         struct dirent *d;
 119         if (!dir)
 120                 return;
 121         while ((d = readdir_skip_dot_and_dotdot(dir)) != NULL) {
 122                 char *path;
 123                 strbuf_reset(&reason);
 124                 if (should_prune_worktree(d->d_name, &reason, &path, expire))
 125                         prune_worktree(d->d_name, reason.buf);
 126                 else if (path)
 127                         string_list_append(&kept, path)->util = xstrdup(d->d_name);
 128         }
 129         closedir(dir);
 130
 131         strbuf_add_absolute_path(&main_path, get_git_common_dir());
 132         /* massage main worktree absolute path to match 'gitdir' content */
 133         strbuf_strip_suffix(&main_path, "/.");
 134         string_list_append(&kept, strbuf_detach(&main_path, NULL));
 135         prune_dups(&kept);
 136         string_list_clear(&kept, 1);
 137
 138         if (!show_only)
 139                 delete_worktrees_dir_if_empty();
 140         strbuf_release(&reason);
 141 }
 142
 143 static int prune(int ac, const char **av, const char *prefix)
 144 {
 145         struct option options[] = {
 146                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 147                 OPT__VERBOSE(&verbose, N_("report pruned working trees")),
 148                 OPT_EXPIRY_DATE(0, "expire", &expire,
 149                                 N_("expire working trees older than <time>")),
 150                 OPT_END()
 151         };
 152
 153         expire = TIME_MAX;
 154         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 155         if (ac)
 156                 usage_with_options(worktree_usage, options);
 157         prune_worktrees();
 158         return 0;
 159 }
 160
 161 static char *junk_work_tree;
 162 static char *junk_git_dir;
 163 static int is_junk;
 164 static pid_t junk_pid;
 165
 166 static void remove_junk(void)
 167 {
 168         struct strbuf sb = STRBUF_INIT;
 169         if (!is_junk || getpid() != junk_pid)
 170                 return;
 171         if (junk_git_dir) {
 172                 strbuf_addstr(&sb, junk_git_dir);
 173                 remove_dir_recursively(&sb, 0);
 174                 strbuf_reset(&sb);
 175         }
 176         if (junk_work_tree) {
 177                 strbuf_addstr(&sb, junk_work_tree);
 178                 remove_dir_recursively(&sb, 0);
 179         }
 180         strbuf_release(&sb);
 181 }
 182
 183 static void remove_junk_on_signal(int signo)
 184 {
 185         remove_junk();
 186         sigchain_pop(signo);
 187         raise(signo);
 188 }
 189
 190 static const char *worktree_basename(const char *path, int *olen)
 191 {
 192         const char *name;
 193         int len;
 194
 195         len = strlen(path);
 196         while (len && is_dir_sep(path[len - 1]))
 197                 len--;
 198
 199         for (name = path + len - 1; name > path; name--)
 200                 if (is_dir_sep(*name)) {
 201                         name++;
 202                         break;
 203                 }
 204
 205         *olen = len;
 206         return name;
 207 }
 208
 209 /* check that path is viable location for worktree */
 210 static void check_candidate_path(const char *path,
 211                                  int force,
 212                                  struct worktree **worktrees,
 213                                  const char *cmd)
 214 {
 215         struct worktree *wt;
 216         int locked;
 217
 218         if (file_exists(path) && !is_empty_dir(path))
 219                 die(_("'%s' already exists"), path);
 220
 221         wt = find_worktree_by_path(worktrees, path);
 222         if (!wt)
 223                 return;
 224
 225         locked = !!worktree_lock_reason(wt);
 226         if ((!locked && force) || (locked && force > 1)) {
 227                 if (delete_git_dir(wt->id))
 228                     die(_("unusable worktree destination '%s'"), path);
 229                 return;
 230         }
 231
 232         if (locked)
 233                 die(_("'%s' is a missing but locked worktree;\nuse '%s -f -f' to override, or 'unlock' and 'prune' or 'remove' to clear"), path, cmd);
 234         else
 235                 die(_("'%s' is a missing but already registered worktree;\nuse '%s -f' to override, or 'prune' or 'remove' to clear"), path, cmd);
 236 }
 237
 238 static int add_worktree(const char *path, const char *refname,
 239                         const struct add_opts *opts)
 240 {
 241         struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 242         struct strbuf sb = STRBUF_INIT, realpath = STRBUF_INIT;
 243         const char *name;
 244         struct child_process cp = CHILD_PROCESS_INIT;
 245         struct strvec child_env = STRVEC_INIT;
 246         unsigned int counter = 0;
 247         int len, ret;
 248         struct strbuf symref = STRBUF_INIT;
 249         struct commit *commit = NULL;
 250         int is_branch = 0;
 251         struct strbuf sb_name = STRBUF_INIT;
 252         struct worktree **worktrees;
 253
 254         worktrees = get_worktrees();
 255         check_candidate_path(path, opts->force, worktrees, "add");
 256         free_worktrees(worktrees);
 257         worktrees = NULL;
 258
 259         /* is 'refname' a branch or commit? */
 260         if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 261             ref_exists(symref.buf)) {
 262                 is_branch = 1;
 263                 if (!opts->force)
 264                         die_if_checked_out(symref.buf, 0);
 265         }
 266         commit = lookup_commit_reference_by_name(refname);
 267         if (!commit)
 268                 die(_("invalid reference: %s"), refname);
 269
 270         name = worktree_basename(path, &len);
 271         strbuf_add(&sb, name, path + len - name);
 272         sanitize_refname_component(sb.buf, &sb_name);
 273         if (!sb_name.len)
 274                 BUG("How come '%s' becomes empty after sanitization?", sb.buf);
 275         strbuf_reset(&sb);
 276         name = sb_name.buf;
 277         git_path_buf(&sb_repo, "worktrees/%s", name);
 278         len = sb_repo.len;
 279         if (safe_create_leading_directories_const(sb_repo.buf))
 280                 die_errno(_("could not create leading directories of '%s'"),
 281                           sb_repo.buf);
 282
 283         while (mkdir(sb_repo.buf, 0777)) {
 284                 counter++;
 285                 if ((errno != EEXIST) || !counter /* overflow */)
 286                         die_errno(_("could not create directory of '%s'"),
 287                                   sb_repo.buf);
 288                 strbuf_setlen(&sb_repo, len);
 289                 strbuf_addf(&sb_repo, "%d", counter);
 290         }
 291         name = strrchr(sb_repo.buf, '/') + 1;
 292
 293         junk_pid = getpid();
 294         atexit(remove_junk);
 295         sigchain_push_common(remove_junk_on_signal);
 296
 297         junk_git_dir = xstrdup(sb_repo.buf);
 298         is_junk = 1;
 299
 300         /*
 301          * lock the incomplete repo so prune won't delete it, unlock
 302          * after the preparation is over.
 303          */
 304         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 305         if (!opts->keep_locked)
 306                 write_file(sb.buf, "initializing");
 307         else
 308                 write_file(sb.buf, "added with --lock");
 309
 310         strbuf_addf(&sb_git, "%s/.git", path);
 311         if (safe_create_leading_directories_const(sb_git.buf))
 312                 die_errno(_("could not create leading directories of '%s'"),
 313                           sb_git.buf);
 314         junk_work_tree = xstrdup(path);
 315
 316         strbuf_reset(&sb);
 317         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 318         strbuf_realpath(&realpath, sb_git.buf, 1);
 319         write_file(sb.buf, "%s", realpath.buf);
 320         strbuf_realpath(&realpath, get_git_common_dir(), 1);
 321         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 322                    realpath.buf, name);
 323         /*
 324          * This is to keep resolve_ref() happy. We need a valid HEAD
 325          * or is_git_directory() will reject the directory. Any value which
 326          * looks like an object ID will do since it will be immediately
 327          * replaced by the symbolic-ref or update-ref invocation in the new
 328          * worktree.
 329          */
 330         strbuf_reset(&sb);
 331         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 332         write_file(sb.buf, "%s", oid_to_hex(&null_oid));
 333         strbuf_reset(&sb);
 334         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 335         write_file(sb.buf, "../..");
 336
 337         strvec_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 338         strvec_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 339         cp.git_cmd = 1;
 340
 341         if (!is_branch)
 342                 strvec_pushl(&cp.args, "update-ref", "HEAD",
 343                              oid_to_hex(&commit->object.oid), NULL);
 344         else {
 345                 strvec_pushl(&cp.args, "symbolic-ref", "HEAD",
 346                              symref.buf, NULL);
 347                 if (opts->quiet)
 348                         strvec_push(&cp.args, "--quiet");
 349         }
 350
 351         cp.env = child_env.v;
 352         ret = run_command(&cp);
 353         if (ret)
 354                 goto done;
 355
 356         if (opts->checkout) {
 357                 cp.argv = NULL;
 358                 strvec_clear(&cp.args);
 359                 strvec_pushl(&cp.args, "reset", "--hard", "--no-recurse-submodules", NULL);
 360                 if (opts->quiet)
 361                         strvec_push(&cp.args, "--quiet");
 362                 cp.env = child_env.v;
 363                 ret = run_command(&cp);
 364                 if (ret)
 365                         goto done;
 366         }
 367
 368         is_junk = 0;
 369         FREE_AND_NULL(junk_work_tree);
 370         FREE_AND_NULL(junk_git_dir);
 371
 372 done:
 373         if (ret || !opts->keep_locked) {
 374                 strbuf_reset(&sb);
 375                 strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 376                 unlink_or_warn(sb.buf);
 377         }
 378
 379         /*
 380          * Hook failure does not warrant worktree deletion, so run hook after
 381          * is_junk is cleared, but do return appropriate code when hook fails.
 382          */
 383         if (!ret && opts->checkout) {
 384                 const char *hook = find_hook("post-checkout");
 385                 if (hook) {
 386                         const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
 387                         cp.git_cmd = 0;
 388                         cp.no_stdin = 1;
 389                         cp.stdout_to_stderr = 1;
 390                         cp.dir = path;
 391                         cp.env = env;
 392                         cp.argv = NULL;
 393                         cp.trace2_hook_name = "post-checkout";
 394                         strvec_pushl(&cp.args, absolute_path(hook),
 395                                      oid_to_hex(&null_oid),
 396                                      oid_to_hex(&commit->object.oid),
 397                                      "1", NULL);
 398                         ret = run_command(&cp);
 399                 }
 400         }
 401
 402         strvec_clear(&child_env);
 403         strbuf_release(&sb);
 404         strbuf_release(&symref);
 405         strbuf_release(&sb_repo);
 406         strbuf_release(&sb_git);
 407         strbuf_release(&sb_name);
 408         strbuf_release(&realpath);
 409         return ret;
 410 }
 411
 412 static void print_preparing_worktree_line(int detach,
 413                                           const char *branch,
 414                                           const char *new_branch,
 415                                           int force_new_branch)
 416 {
 417         if (force_new_branch) {
 418                 struct commit *commit = lookup_commit_reference_by_name(new_branch);
 419                 if (!commit)
 420                         printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 421                 else
 422                         printf_ln(_("Preparing worktree (resetting branch '%s'; was at %s)"),
 423                                   new_branch,
 424                                   find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 425         } else if (new_branch) {
 426                 printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 427         } else {
 428                 struct strbuf s = STRBUF_INIT;
 429                 if (!detach && !strbuf_check_branch_ref(&s, branch) &&
 430                     ref_exists(s.buf))
 431                         printf_ln(_("Preparing worktree (checking out '%s')"),
 432                                   branch);
 433                 else {
 434                         struct commit *commit = lookup_commit_reference_by_name(branch);
 435                         if (!commit)
 436                                 die(_("invalid reference: %s"), branch);
 437                         printf_ln(_("Preparing worktree (detached HEAD %s)"),
 438                                   find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 439                 }
 440                 strbuf_release(&s);
 441         }
 442 }
 443
 444 static const char *dwim_branch(const char *path, const char **new_branch)
 445 {
 446         int n;
 447         const char *s = worktree_basename(path, &n);
 448         const char *branchname = xstrndup(s, n);
 449         struct strbuf ref = STRBUF_INIT;
 450
 451         UNLEAK(branchname);
 452         if (!strbuf_check_branch_ref(&ref, branchname) &&
 453             ref_exists(ref.buf)) {
 454                 strbuf_release(&ref);
 455                 return branchname;
 456         }
 457
 458         *new_branch = branchname;
 459         if (guess_remote) {
 460                 struct object_id oid;
 461                 const char *remote =
 462                         unique_tracking_name(*new_branch, &oid, NULL);
 463                 return remote;
 464         }
 465         return NULL;
 466 }
 467
 468 static int add(int ac, const char **av, const char *prefix)
 469 {
 470         struct add_opts opts;
 471         const char *new_branch_force = NULL;
 472         char *path;
 473         const char *branch;
 474         const char *new_branch = NULL;
 475         const char *opt_track = NULL;
 476         struct option options[] = {
 477                 OPT__FORCE(&opts.force,
 478                            N_("checkout <branch> even if already checked out in other worktree"),
 479                            PARSE_OPT_NOCOMPLETE),
 480                 OPT_STRING('b', NULL, &new_branch, N_("branch"),
 481                            N_("create a new branch")),
 482                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 483                            N_("create or reset a branch")),
 484                 OPT_BOOL('d', "detach", &opts.detach, N_("detach HEAD at named commit")),
 485                 OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 486                 OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
 487                 OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
 488                 OPT_PASSTHRU(0, "track", &opt_track, NULL,
 489                              N_("set up tracking mode (see git-branch(1))"),
 490                              PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
 491                 OPT_BOOL(0, "guess-remote", &guess_remote,
 492                          N_("try to match the new branch name with a remote-tracking branch")),
 493                 OPT_END()
 494         };
 495
 496         memset(&opts, 0, sizeof(opts));
 497         opts.checkout = 1;
 498         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 499         if (!!opts.detach + !!new_branch + !!new_branch_force > 1)
 500                 die(_("-b, -B, and --detach are mutually exclusive"));
 501         if (ac < 1 || ac > 2)
 502                 usage_with_options(worktree_usage, options);
 503
 504         path = prefix_filename(prefix, av[0]);
 505         branch = ac < 2 ? "HEAD" : av[1];
 506
 507         if (!strcmp(branch, "-"))
 508                 branch = "@{-1}";
 509
 510         if (new_branch_force) {
 511                 struct strbuf symref = STRBUF_INIT;
 512
 513                 new_branch = new_branch_force;
 514
 515                 if (!opts.force &&
 516                     !strbuf_check_branch_ref(&symref, new_branch) &&
 517                     ref_exists(symref.buf))
 518                         die_if_checked_out(symref.buf, 0);
 519                 strbuf_release(&symref);
 520         }
 521
 522         if (ac < 2 && !new_branch && !opts.detach) {
 523                 const char *s = dwim_branch(path, &new_branch);
 524                 if (s)
 525                         branch = s;
 526         }
 527
 528         if (ac == 2 && !new_branch && !opts.detach) {
 529                 struct object_id oid;
 530                 struct commit *commit;
 531                 const char *remote;
 532
 533                 commit = lookup_commit_reference_by_name(branch);
 534                 if (!commit) {
 535                         remote = unique_tracking_name(branch, &oid, NULL);
 536                         if (remote) {
 537                                 new_branch = branch;
 538                                 branch = remote;
 539                         }
 540                 }
 541         }
 542         if (!opts.quiet)
 543                 print_preparing_worktree_line(opts.detach, branch, new_branch, !!new_branch_force);
 544
 545         if (new_branch) {
 546                 struct child_process cp = CHILD_PROCESS_INIT;
 547                 cp.git_cmd = 1;
 548                 strvec_push(&cp.args, "branch");
 549                 if (new_branch_force)
 550                         strvec_push(&cp.args, "--force");
 551                 if (opts.quiet)
 552                         strvec_push(&cp.args, "--quiet");
 553                 strvec_push(&cp.args, new_branch);
 554                 strvec_push(&cp.args, branch);
 555                 if (opt_track)
 556                         strvec_push(&cp.args, opt_track);
 557                 if (run_command(&cp))
 558                         return -1;
 559                 branch = new_branch;
 560         } else if (opt_track) {
 561                 die(_("--[no-]track can only be used if a new branch is created"));
 562         }
 563
 564         UNLEAK(path);
 565         UNLEAK(opts);
 566         return add_worktree(path, branch, &opts);
 567 }
 568
 569 static void show_worktree_porcelain(struct worktree *wt)
 570 {
 571         const char *reason;
 572
 573         printf("worktree %s\n", wt->path);
 574         if (wt->is_bare)
 575                 printf("bare\n");
 576         else {
 577                 printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
 578                 if (wt->is_detached)
 579                         printf("detached\n");
 580                 else if (wt->head_ref)
 581                         printf("branch %s\n", wt->head_ref);
 582         }
 583
 584         reason = worktree_lock_reason(wt);
 585         if (reason && *reason) {
 586                 struct strbuf sb = STRBUF_INIT;
 587                 quote_c_style(reason, &sb, NULL, 0);
 588                 printf("locked %s\n", sb.buf);
 589                 strbuf_release(&sb);
 590         } else if (reason)
 591                 printf("locked\n");
 592
 593         reason = worktree_prune_reason(wt, expire);
 594         if (reason)
 595                 printf("prunable %s\n", reason);
 596
 597         printf("\n");
 598 }
 599
 600 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 601 {
 602         struct strbuf sb = STRBUF_INIT;
 603         int cur_path_len = strlen(wt->path);
 604         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 605         const char *reason;
 606
 607         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 608         if (wt->is_bare)
 609                 strbuf_addstr(&sb, "(bare)");
 610         else {
 611                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 612                                 find_unique_abbrev(&wt->head_oid, DEFAULT_ABBREV));
 613                 if (wt->is_detached)
 614                         strbuf_addstr(&sb, "(detached HEAD)");
 615                 else if (wt->head_ref) {
 616                         char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
 617                         strbuf_addf(&sb, "[%s]", ref);
 618                         free(ref);
 619                 } else
 620                         strbuf_addstr(&sb, "(error)");
 621         }
 622
 623         reason = worktree_lock_reason(wt);
 624         if (verbose && reason && *reason)
 625                 strbuf_addf(&sb, "\n\tlocked: %s", reason);
 626         else if (reason)
 627                 strbuf_addstr(&sb, " locked");
 628
 629         reason = worktree_prune_reason(wt, expire);
 630         if (verbose && reason)
 631                 strbuf_addf(&sb, "\n\tprunable: %s", reason);
 632         else if (reason)
 633                 strbuf_addstr(&sb, " prunable");
 634
 635         printf("%s\n", sb.buf);
 636         strbuf_release(&sb);
 637 }
 638
 639 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 640 {
 641         int i;
 642
 643         for (i = 0; wt[i]; i++) {
 644                 int sha1_len;
 645                 int path_len = strlen(wt[i]->path);
 646
 647                 if (path_len > *maxlen)
 648                         *maxlen = path_len;
 649                 sha1_len = strlen(find_unique_abbrev(&wt[i]->head_oid, *abbrev));
 650                 if (sha1_len > *abbrev)
 651                         *abbrev = sha1_len;
 652         }
 653 }
 654
 655 static int pathcmp(const void *a_, const void *b_)
 656 {
 657         const struct worktree *const *a = a_;
 658         const struct worktree *const *b = b_;
 659         return fspathcmp((*a)->path, (*b)->path);
 660 }
 661
 662 static void pathsort(struct worktree **wt)
 663 {
 664         int n = 0;
 665         struct worktree **p = wt;
 666
 667         while (*p++)
 668                 n++;
 669         QSORT(wt, n, pathcmp);
 670 }
 671
 672 static int list(int ac, const char **av, const char *prefix)
 673 {
 674         int porcelain = 0;
 675
 676         struct option options[] = {
 677                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 678                 OPT__VERBOSE(&verbose, N_("show extended annotations and reasons, if available")),
 679                 OPT_EXPIRY_DATE(0, "expire", &expire,
 680                                 N_("add 'prunable' annotation to worktrees older than <time>")),
 681                 OPT_END()
 682         };
 683
 684         expire = TIME_MAX;
 685         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 686         if (ac)
 687                 usage_with_options(worktree_usage, options);
 688         else if (verbose && porcelain)
 689                 die(_("--verbose and --porcelain are mutually exclusive"));
 690         else {
 691                 struct worktree **worktrees = get_worktrees();
 692                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 693
 694                 /* sort worktrees by path but keep main worktree at top */
 695                 pathsort(worktrees + 1);
 696
 697                 if (!porcelain)
 698                         measure_widths(worktrees, &abbrev, &path_maxlen);
 699
 700                 for (i = 0; worktrees[i]; i++) {
 701                         if (porcelain)
 702                                 show_worktree_porcelain(worktrees[i]);
 703                         else
 704                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 705                 }
 706                 free_worktrees(worktrees);
 707         }
 708         return 0;
 709 }
 710
 711 static int lock_worktree(int ac, const char **av, const char *prefix)
 712 {
 713         const char *reason = "", *old_reason;
 714         struct option options[] = {
 715                 OPT_STRING(0, "reason", &reason, N_("string"),
 716                            N_("reason for locking")),
 717                 OPT_END()
 718         };
 719         struct worktree **worktrees, *wt;
 720
 721         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 722         if (ac != 1)
 723                 usage_with_options(worktree_usage, options);
 724
 725         worktrees = get_worktrees();
 726         wt = find_worktree(worktrees, prefix, av[0]);
 727         if (!wt)
 728                 die(_("'%s' is not a working tree"), av[0]);
 729         if (is_main_worktree(wt))
 730                 die(_("The main working tree cannot be locked or unlocked"));
 731
 732         old_reason = worktree_lock_reason(wt);
 733         if (old_reason) {
 734                 if (*old_reason)
 735                         die(_("'%s' is already locked, reason: %s"),
 736                             av[0], old_reason);
 737                 die(_("'%s' is already locked"), av[0]);
 738         }
 739
 740         write_file(git_common_path("worktrees/%s/locked", wt->id),
 741                    "%s", reason);
 742         free_worktrees(worktrees);
 743         return 0;
 744 }
 745
 746 static int unlock_worktree(int ac, const char **av, const char *prefix)
 747 {
 748         struct option options[] = {
 749                 OPT_END()
 750         };
 751         struct worktree **worktrees, *wt;
 752         int ret;
 753
 754         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 755         if (ac != 1)
 756                 usage_with_options(worktree_usage, options);
 757
 758         worktrees = get_worktrees();
 759         wt = find_worktree(worktrees, prefix, av[0]);
 760         if (!wt)
 761                 die(_("'%s' is not a working tree"), av[0]);
 762         if (is_main_worktree(wt))
 763                 die(_("The main working tree cannot be locked or unlocked"));
 764         if (!worktree_lock_reason(wt))
 765                 die(_("'%s' is not locked"), av[0]);
 766         ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 767         free_worktrees(worktrees);
 768         return ret;
 769 }
 770
 771 static void validate_no_submodules(const struct worktree *wt)
 772 {
 773         struct index_state istate = { NULL };
 774         struct strbuf path = STRBUF_INIT;
 775         int i, found_submodules = 0;
 776
 777         if (is_directory(worktree_git_path(wt, "modules"))) {
 778                 /*
 779                  * There could be false positives, e.g. the "modules"
 780                  * directory exists but is empty. But it's a rare case and
 781                  * this simpler check is probably good enough for now.
 782                  */
 783                 found_submodules = 1;
 784         } else if (read_index_from(&istate, worktree_git_path(wt, "index"),
 785                                    get_worktree_git_dir(wt)) > 0) {
 786                 for (i = 0; i < istate.cache_nr; i++) {
 787                         struct cache_entry *ce = istate.cache[i];
 788                         int err;
 789
 790                         if (!S_ISGITLINK(ce->ce_mode))
 791                                 continue;
 792
 793                         strbuf_reset(&path);
 794                         strbuf_addf(&path, "%s/%s", wt->path, ce->name);
 795                         if (!is_submodule_populated_gently(path.buf, &err))
 796                                 continue;
 797
 798                         found_submodules = 1;
 799                         break;
 800                 }
 801         }
 802         discard_index(&istate);
 803         strbuf_release(&path);
 804
 805         if (found_submodules)
 806                 die(_("working trees containing submodules cannot be moved or removed"));
 807 }
 808
 809 static int move_worktree(int ac, const char **av, const char *prefix)
 810 {
 811         int force = 0;
 812         struct option options[] = {
 813                 OPT__FORCE(&force,
 814                          N_("force move even if worktree is dirty or locked"),
 815                          PARSE_OPT_NOCOMPLETE),
 816                 OPT_END()
 817         };
 818         struct worktree **worktrees, *wt;
 819         struct strbuf dst = STRBUF_INIT;
 820         struct strbuf errmsg = STRBUF_INIT;
 821         const char *reason = NULL;
 822         char *path;
 823
 824         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 825         if (ac != 2)
 826                 usage_with_options(worktree_usage, options);
 827
 828         path = prefix_filename(prefix, av[1]);
 829         strbuf_addstr(&dst, path);
 830         free(path);
 831
 832         worktrees = get_worktrees();
 833         wt = find_worktree(worktrees, prefix, av[0]);
 834         if (!wt)
 835                 die(_("'%s' is not a working tree"), av[0]);
 836         if (is_main_worktree(wt))
 837                 die(_("'%s' is a main working tree"), av[0]);
 838         if (is_directory(dst.buf)) {
 839                 const char *sep = find_last_dir_sep(wt->path);
 840
 841                 if (!sep)
 842                         die(_("could not figure out destination name from '%s'"),
 843                             wt->path);
 844                 strbuf_trim_trailing_dir_sep(&dst);
 845                 strbuf_addstr(&dst, sep);
 846         }
 847         check_candidate_path(dst.buf, force, worktrees, "move");
 848
 849         validate_no_submodules(wt);
 850
 851         if (force < 2)
 852                 reason = worktree_lock_reason(wt);
 853         if (reason) {
 854                 if (*reason)
 855                         die(_("cannot move a locked working tree, lock reason: %s\nuse 'move -f -f' to override or unlock first"),
 856                             reason);
 857                 die(_("cannot move a locked working tree;\nuse 'move -f -f' to override or unlock first"));
 858         }
 859         if (validate_worktree(wt, &errmsg, 0))
 860                 die(_("validation failed, cannot move working tree: %s"),
 861                     errmsg.buf);
 862         strbuf_release(&errmsg);
 863
 864         if (rename(wt->path, dst.buf) == -1)
 865                 die_errno(_("failed to move '%s' to '%s'"), wt->path, dst.buf);
 866
 867         update_worktree_location(wt, dst.buf);
 868
 869         strbuf_release(&dst);
 870         free_worktrees(worktrees);
 871         return 0;
 872 }
 873
 874 /*
 875  * Note, "git status --porcelain" is used to determine if it's safe to
 876  * delete a whole worktree. "git status" does not ignore user
 877  * configuration, so if a normal "git status" shows "clean" for the
 878  * user, then it's ok to remove it.
 879  *
 880  * This assumption may be a bad one. We may want to ignore
 881  * (potentially bad) user settings and only delete a worktree when
 882  * it's absolutely safe to do so from _our_ point of view because we
 883  * know better.
 884  */
 885 static void check_clean_worktree(struct worktree *wt,
 886                                  const char *original_path)
 887 {
 888         struct child_process cp;
 889         char buf[1];
 890         int ret;
 891
 892         /*
 893          * Until we sort this out, all submodules are "dirty" and
 894          * will abort this function.
 895          */
 896         validate_no_submodules(wt);
 897
 898         child_process_init(&cp);
 899         strvec_pushf(&cp.env_array, "%s=%s/.git",
 900                      GIT_DIR_ENVIRONMENT, wt->path);
 901         strvec_pushf(&cp.env_array, "%s=%s",
 902                      GIT_WORK_TREE_ENVIRONMENT, wt->path);
 903         strvec_pushl(&cp.args, "status",
 904                      "--porcelain", "--ignore-submodules=none",
 905                      NULL);
 906         cp.git_cmd = 1;
 907         cp.dir = wt->path;
 908         cp.out = -1;
 909         ret = start_command(&cp);
 910         if (ret)
 911                 die_errno(_("failed to run 'git status' on '%s'"),
 912                           original_path);
 913         ret = xread(cp.out, buf, sizeof(buf));
 914         if (ret)
 915                 die(_("'%s' contains modified or untracked files, use --force to delete it"),
 916                     original_path);
 917         close(cp.out);
 918         ret = finish_command(&cp);
 919         if (ret)
 920                 die_errno(_("failed to run 'git status' on '%s', code %d"),
 921                           original_path, ret);
 922 }
 923
 924 static int delete_git_work_tree(struct worktree *wt)
 925 {
 926         struct strbuf sb = STRBUF_INIT;
 927         int ret = 0;
 928
 929         strbuf_addstr(&sb, wt->path);
 930         if (remove_dir_recursively(&sb, 0)) {
 931                 error_errno(_("failed to delete '%s'"), sb.buf);
 932                 ret = -1;
 933         }
 934         strbuf_release(&sb);
 935         return ret;
 936 }
 937
 938 static int remove_worktree(int ac, const char **av, const char *prefix)
 939 {
 940         int force = 0;
 941         struct option options[] = {
 942                 OPT__FORCE(&force,
 943                          N_("force removal even if worktree is dirty or locked"),
 944                          PARSE_OPT_NOCOMPLETE),
 945                 OPT_END()
 946         };
 947         struct worktree **worktrees, *wt;
 948         struct strbuf errmsg = STRBUF_INIT;
 949         const char *reason = NULL;
 950         int ret = 0;
 951
 952         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 953         if (ac != 1)
 954                 usage_with_options(worktree_usage, options);
 955
 956         worktrees = get_worktrees();
 957         wt = find_worktree(worktrees, prefix, av[0]);
 958         if (!wt)
 959                 die(_("'%s' is not a working tree"), av[0]);
 960         if (is_main_worktree(wt))
 961                 die(_("'%s' is a main working tree"), av[0]);
 962         if (force < 2)
 963                 reason = worktree_lock_reason(wt);
 964         if (reason) {
 965                 if (*reason)
 966                         die(_("cannot remove a locked working tree, lock reason: %s\nuse 'remove -f -f' to override or unlock first"),
 967                             reason);
 968                 die(_("cannot remove a locked working tree;\nuse 'remove -f -f' to override or unlock first"));
 969         }
 970         if (validate_worktree(wt, &errmsg, WT_VALIDATE_WORKTREE_MISSING_OK))
 971                 die(_("validation failed, cannot remove working tree: %s"),
 972                     errmsg.buf);
 973         strbuf_release(&errmsg);
 974
 975         if (file_exists(wt->path)) {
 976                 if (!force)
 977                         check_clean_worktree(wt, av[0]);
 978
 979                 ret |= delete_git_work_tree(wt);
 980         }
 981         /*
 982          * continue on even if ret is non-zero, there's no going back
 983          * from here.
 984          */
 985         ret |= delete_git_dir(wt->id);
 986         delete_worktrees_dir_if_empty();
 987
 988         free_worktrees(worktrees);
 989         return ret;
 990 }
 991
 992 static void report_repair(int iserr, const char *path, const char *msg, void *cb_data)
 993 {
 994         if (!iserr) {
 995                 printf_ln(_("repair: %s: %s"), msg, path);
 996         } else {
 997                 int *exit_status = (int *)cb_data;
 998                 fprintf_ln(stderr, _("error: %s: %s"), msg, path);
 999                 *exit_status = 1;
1000         }
1001 }
1002
1003 static int repair(int ac, const char **av, const char *prefix)
1004 {
1005         const char **p;
1006         const char *self[] = { ".", NULL };
1007         struct option options[] = {
1008                 OPT_END()
1009         };
1010         int rc = 0;
1011
1012         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
1013         p = ac > 0 ? av : self;
1014         for (; *p; p++)
1015                 repair_worktree_at_path(*p, report_repair, &rc);
1016         repair_worktrees(report_repair, &rc);
1017         return rc;
1018 }
1019
1020 int cmd_worktree(int ac, const char **av, const char *prefix)
1021 {
1022         struct option options[] = {
1023                 OPT_END()
1024         };
1025
1026         git_config(git_worktree_config, NULL);
1027
1028         if (ac < 2)
1029                 usage_with_options(worktree_usage, options);
1030         if (!prefix)
1031                 prefix = "";
1032         if (!strcmp(av[1], "add"))
1033                 return add(ac - 1, av + 1, prefix);
1034         if (!strcmp(av[1], "prune"))
1035                 return prune(ac - 1, av + 1, prefix);
1036         if (!strcmp(av[1], "list"))
1037                 return list(ac - 1, av + 1, prefix);
1038         if (!strcmp(av[1], "lock"))
1039                 return lock_worktree(ac - 1, av + 1, prefix);
1040         if (!strcmp(av[1], "unlock"))
1041                 return unlock_worktree(ac - 1, av + 1, prefix);
1042         if (!strcmp(av[1], "move"))
1043                 return move_worktree(ac - 1, av + 1, prefix);
1044         if (!strcmp(av[1], "remove"))
1045                 return remove_worktree(ac - 1, av + 1, prefix);
1046         if (!strcmp(av[1], "repair"))
1047                 return repair(ac - 1, av + 1, prefix);
1048         usage_with_options(worktree_usage, options);
1049 }