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> [<branch>]"),
  18         N_("git worktree list [<options>]"),
  19         N_("git worktree lock [<options>] <path>"),
  20         N_("git worktree prune [<options>]"),
  21         N_("git worktree unlock <path>"),
  22         NULL
  23 };
  24
  25 struct add_opts {
  26         int force;
  27         int detach;
  28         int checkout;
  29         int keep_locked;
  30         const char *new_branch;
  31         int force_new_branch;
  32 };
  33
  34 static int show_only;
  35 static int verbose;
  36 static int guess_remote;
  37 static timestamp_t expire;
  38
  39 static int git_worktree_config(const char *var, const char *value, void *cb)
  40 {
  41         if (!strcmp(var, "worktree.guessremote")) {
  42                 guess_remote = git_config_bool(var, value);
  43                 return 0;
  44         }
  45
  46         return git_default_config(var, value, cb);
  47 }
  48
  49 static int prune_worktree(const char *id, struct strbuf *reason)
  50 {
  51         struct stat st;
  52         char *path;
  53         int fd;
  54         size_t len;
  55         ssize_t read_result;
  56
  57         if (!is_directory(git_path("worktrees/%s", id))) {
  58                 strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  59                 return 1;
  60         }
  61         if (file_exists(git_path("worktrees/%s/locked", id)))
  62                 return 0;
  63         if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  64                 strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  65                 return 1;
  66         }
  67         fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  68         if (fd < 0) {
  69                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  70                             id, strerror(errno));
  71                 return 1;
  72         }
  73         len = xsize_t(st.st_size);
  74         path = xmallocz(len);
  75
  76         read_result = read_in_full(fd, path, len);
  77         if (read_result < 0) {
  78                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  79                             id, strerror(errno));
  80                 close(fd);
  81                 free(path);
  82                 return 1;
  83         }
  84         close(fd);
  85
  86         if (read_result != len) {
  87                 strbuf_addf(reason,
  88                             _("Removing worktrees/%s: short read (expected %"PRIuMAX" bytes, read %"PRIuMAX")"),
  89                             id, (uintmax_t)len, (uintmax_t)read_result);
  90                 free(path);
  91                 return 1;
  92         }
  93         while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
  94                 len--;
  95         if (!len) {
  96                 strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
  97                 free(path);
  98                 return 1;
  99         }
 100         path[len] = '\0';
 101         if (!file_exists(path)) {
 102                 struct stat st_link;
 103                 free(path);
 104                 /*
 105                  * the repo is moved manually and has not been
 106                  * accessed since?
 107                  */
 108                 if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
 109                     st_link.st_nlink > 1)
 110                         return 0;
 111                 if (st.st_mtime <= expire) {
 112                         strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
 113                         return 1;
 114                 } else {
 115                         return 0;
 116                 }
 117         }
 118         free(path);
 119         return 0;
 120 }
 121
 122 static void prune_worktrees(void)
 123 {
 124         struct strbuf reason = STRBUF_INIT;
 125         struct strbuf path = STRBUF_INIT;
 126         DIR *dir = opendir(git_path("worktrees"));
 127         struct dirent *d;
 128         int ret;
 129         if (!dir)
 130                 return;
 131         while ((d = readdir(dir)) != NULL) {
 132                 if (is_dot_or_dotdot(d->d_name))
 133                         continue;
 134                 strbuf_reset(&reason);
 135                 if (!prune_worktree(d->d_name, &reason))
 136                         continue;
 137                 if (show_only || verbose)
 138                         printf("%s\n", reason.buf);
 139                 if (show_only)
 140                         continue;
 141                 git_path_buf(&path, "worktrees/%s", d->d_name);
 142                 ret = remove_dir_recursively(&path, 0);
 143                 if (ret < 0 && errno == ENOTDIR)
 144                         ret = unlink(path.buf);
 145                 if (ret)
 146                         error_errno(_("failed to remove '%s'"), path.buf);
 147         }
 148         closedir(dir);
 149         if (!show_only)
 150                 rmdir(git_path("worktrees"));
 151         strbuf_release(&reason);
 152         strbuf_release(&path);
 153 }
 154
 155 static int prune(int ac, const char **av, const char *prefix)
 156 {
 157         struct option options[] = {
 158                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 159                 OPT__VERBOSE(&verbose, N_("report pruned working trees")),
 160                 OPT_EXPIRY_DATE(0, "expire", &expire,
 161                                 N_("expire working trees older than <time>")),
 162                 OPT_END()
 163         };
 164
 165         expire = TIME_MAX;
 166         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 167         if (ac)
 168                 usage_with_options(worktree_usage, options);
 169         prune_worktrees();
 170         return 0;
 171 }
 172
 173 static char *junk_work_tree;
 174 static char *junk_git_dir;
 175 static int is_junk;
 176 static pid_t junk_pid;
 177
 178 static void remove_junk(void)
 179 {
 180         struct strbuf sb = STRBUF_INIT;
 181         if (!is_junk || getpid() != junk_pid)
 182                 return;
 183         if (junk_git_dir) {
 184                 strbuf_addstr(&sb, junk_git_dir);
 185                 remove_dir_recursively(&sb, 0);
 186                 strbuf_reset(&sb);
 187         }
 188         if (junk_work_tree) {
 189                 strbuf_addstr(&sb, junk_work_tree);
 190                 remove_dir_recursively(&sb, 0);
 191         }
 192         strbuf_release(&sb);
 193 }
 194
 195 static void remove_junk_on_signal(int signo)
 196 {
 197         remove_junk();
 198         sigchain_pop(signo);
 199         raise(signo);
 200 }
 201
 202 static const char *worktree_basename(const char *path, int *olen)
 203 {
 204         const char *name;
 205         int len;
 206
 207         len = strlen(path);
 208         while (len && is_dir_sep(path[len - 1]))
 209                 len--;
 210
 211         for (name = path + len - 1; name > path; name--)
 212                 if (is_dir_sep(*name)) {
 213                         name++;
 214                         break;
 215                 }
 216
 217         *olen = len;
 218         return name;
 219 }
 220
 221 static int add_worktree(const char *path, const char *refname,
 222                         const struct add_opts *opts)
 223 {
 224         struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 225         struct strbuf sb = STRBUF_INIT;
 226         const char *name;
 227         struct stat st;
 228         struct child_process cp = CHILD_PROCESS_INIT;
 229         struct argv_array child_env = ARGV_ARRAY_INIT;
 230         int counter = 0, len, ret;
 231         struct strbuf symref = STRBUF_INIT;
 232         struct commit *commit = NULL;
 233         int is_branch = 0;
 234
 235         if (file_exists(path) && !is_empty_dir(path))
 236                 die(_("'%s' already exists"), path);
 237
 238         /* is 'refname' a branch or commit? */
 239         if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 240             ref_exists(symref.buf)) {
 241                 is_branch = 1;
 242                 if (!opts->force)
 243                         die_if_checked_out(symref.buf, 0);
 244         }
 245         commit = lookup_commit_reference_by_name(refname);
 246         if (!commit)
 247                 die(_("invalid reference: %s"), refname);
 248
 249         name = worktree_basename(path, &len);
 250         git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
 251         len = sb_repo.len;
 252         if (safe_create_leading_directories_const(sb_repo.buf))
 253                 die_errno(_("could not create leading directories of '%s'"),
 254                           sb_repo.buf);
 255         while (!stat(sb_repo.buf, &st)) {
 256                 counter++;
 257                 strbuf_setlen(&sb_repo, len);
 258                 strbuf_addf(&sb_repo, "%d", counter);
 259         }
 260         name = strrchr(sb_repo.buf, '/') + 1;
 261
 262         junk_pid = getpid();
 263         atexit(remove_junk);
 264         sigchain_push_common(remove_junk_on_signal);
 265
 266         if (mkdir(sb_repo.buf, 0777))
 267                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 268         junk_git_dir = xstrdup(sb_repo.buf);
 269         is_junk = 1;
 270
 271         /*
 272          * lock the incomplete repo so prune won't delete it, unlock
 273          * after the preparation is over.
 274          */
 275         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 276         if (!opts->keep_locked)
 277                 write_file(sb.buf, "initializing");
 278         else
 279                 write_file(sb.buf, "added with --lock");
 280
 281         strbuf_addf(&sb_git, "%s/.git", path);
 282         if (safe_create_leading_directories_const(sb_git.buf))
 283                 die_errno(_("could not create leading directories of '%s'"),
 284                           sb_git.buf);
 285         junk_work_tree = xstrdup(path);
 286
 287         strbuf_reset(&sb);
 288         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 289         write_file(sb.buf, "%s", real_path(sb_git.buf));
 290         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 291                    real_path(get_git_common_dir()), name);
 292         /*
 293          * This is to keep resolve_ref() happy. We need a valid HEAD
 294          * or is_git_directory() will reject the directory. Any value which
 295          * looks like an object ID will do since it will be immediately
 296          * replaced by the symbolic-ref or update-ref invocation in the new
 297          * worktree.
 298          */
 299         strbuf_reset(&sb);
 300         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 301         write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
 302         strbuf_reset(&sb);
 303         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 304         write_file(sb.buf, "../..");
 305
 306         fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
 307
 308         argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 309         argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 310         cp.git_cmd = 1;
 311
 312         if (!is_branch)
 313                 argv_array_pushl(&cp.args, "update-ref", "HEAD",
 314                                  oid_to_hex(&commit->object.oid), NULL);
 315         else
 316                 argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 317                                  symref.buf, NULL);
 318         cp.env = child_env.argv;
 319         ret = run_command(&cp);
 320         if (ret)
 321                 goto done;
 322
 323         if (opts->checkout) {
 324                 cp.argv = NULL;
 325                 argv_array_clear(&cp.args);
 326                 argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 327                 cp.env = child_env.argv;
 328                 ret = run_command(&cp);
 329                 if (ret)
 330                         goto done;
 331         }
 332
 333         is_junk = 0;
 334         FREE_AND_NULL(junk_work_tree);
 335         FREE_AND_NULL(junk_git_dir);
 336
 337 done:
 338         if (ret || !opts->keep_locked) {
 339                 strbuf_reset(&sb);
 340                 strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 341                 unlink_or_warn(sb.buf);
 342         }
 343
 344         /*
 345          * Hook failure does not warrant worktree deletion, so run hook after
 346          * is_junk is cleared, but do return appropriate code when hook fails.
 347          */
 348         if (!ret && opts->checkout)
 349                 ret = run_hook_le(NULL, "post-checkout", oid_to_hex(&null_oid),
 350                                   oid_to_hex(&commit->object.oid), "1", NULL);
 351
 352         argv_array_clear(&child_env);
 353         strbuf_release(&sb);
 354         strbuf_release(&symref);
 355         strbuf_release(&sb_repo);
 356         strbuf_release(&sb_git);
 357         return ret;
 358 }
 359
 360 static int add(int ac, const char **av, const char *prefix)
 361 {
 362         struct add_opts opts;
 363         const char *new_branch_force = NULL;
 364         char *path;
 365         const char *branch;
 366         const char *opt_track = NULL;
 367         struct option options[] = {
 368                 OPT__FORCE(&opts.force,
 369                            N_("checkout <branch> even if already checked out in other worktree"),
 370                            0),
 371                 OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 372                            N_("create a new branch")),
 373                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 374                            N_("create or reset a branch")),
 375                 OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 376                 OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 377                 OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
 378                 OPT_PASSTHRU(0, "track", &opt_track, NULL,
 379                              N_("set up tracking mode (see git-branch(1))"),
 380                              PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
 381                 OPT_BOOL(0, "guess-remote", &guess_remote,
 382                          N_("try to match the new branch name with a remote-tracking branch")),
 383                 OPT_END()
 384         };
 385
 386         memset(&opts, 0, sizeof(opts));
 387         opts.checkout = 1;
 388         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 389         if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 390                 die(_("-b, -B, and --detach are mutually exclusive"));
 391         if (ac < 1 || ac > 2)
 392                 usage_with_options(worktree_usage, options);
 393
 394         path = prefix_filename(prefix, av[0]);
 395         branch = ac < 2 ? "HEAD" : av[1];
 396
 397         if (!strcmp(branch, "-"))
 398                 branch = "@{-1}";
 399
 400         opts.force_new_branch = !!new_branch_force;
 401         if (opts.force_new_branch) {
 402                 struct strbuf symref = STRBUF_INIT;
 403
 404                 opts.new_branch = new_branch_force;
 405
 406                 if (!opts.force &&
 407                     !strbuf_check_branch_ref(&symref, opts.new_branch) &&
 408                     ref_exists(symref.buf))
 409                         die_if_checked_out(symref.buf, 0);
 410                 strbuf_release(&symref);
 411         }
 412
 413         if (ac < 2 && !opts.new_branch && !opts.detach) {
 414                 int n;
 415                 const char *s = worktree_basename(path, &n);
 416                 opts.new_branch = xstrndup(s, n);
 417                 if (guess_remote) {
 418                         struct object_id oid;
 419                         const char *remote =
 420                                 unique_tracking_name(opts.new_branch, &oid);
 421                         if (remote)
 422                                 branch = remote;
 423                 }
 424         }
 425
 426         if (ac == 2 && !opts.new_branch && !opts.detach) {
 427                 struct object_id oid;
 428                 struct commit *commit;
 429                 const char *remote;
 430
 431                 commit = lookup_commit_reference_by_name(branch);
 432                 if (!commit) {
 433                         remote = unique_tracking_name(branch, &oid);
 434                         if (remote) {
 435                                 opts.new_branch = branch;
 436                                 branch = remote;
 437                         }
 438                 }
 439         }
 440
 441         if (opts.new_branch) {
 442                 struct child_process cp = CHILD_PROCESS_INIT;
 443                 cp.git_cmd = 1;
 444                 argv_array_push(&cp.args, "branch");
 445                 if (opts.force_new_branch)
 446                         argv_array_push(&cp.args, "--force");
 447                 argv_array_push(&cp.args, opts.new_branch);
 448                 argv_array_push(&cp.args, branch);
 449                 if (opt_track)
 450                         argv_array_push(&cp.args, opt_track);
 451                 if (run_command(&cp))
 452                         return -1;
 453                 branch = opts.new_branch;
 454         } else if (opt_track) {
 455                 die(_("--[no-]track can only be used if a new branch is created"));
 456         }
 457
 458         UNLEAK(path);
 459         UNLEAK(opts);
 460         return add_worktree(path, branch, &opts);
 461 }
 462
 463 static void show_worktree_porcelain(struct worktree *wt)
 464 {
 465         printf("worktree %s\n", wt->path);
 466         if (wt->is_bare)
 467                 printf("bare\n");
 468         else {
 469                 printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
 470                 if (wt->is_detached)
 471                         printf("detached\n");
 472                 else if (wt->head_ref)
 473                         printf("branch %s\n", wt->head_ref);
 474         }
 475         printf("\n");
 476 }
 477
 478 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 479 {
 480         struct strbuf sb = STRBUF_INIT;
 481         int cur_path_len = strlen(wt->path);
 482         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 483
 484         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 485         if (wt->is_bare)
 486                 strbuf_addstr(&sb, "(bare)");
 487         else {
 488                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 489                                 find_unique_abbrev(wt->head_oid.hash, DEFAULT_ABBREV));
 490                 if (wt->is_detached)
 491                         strbuf_addstr(&sb, "(detached HEAD)");
 492                 else if (wt->head_ref) {
 493                         char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
 494                         strbuf_addf(&sb, "[%s]", ref);
 495                         free(ref);
 496                 } else
 497                         strbuf_addstr(&sb, "(error)");
 498         }
 499         printf("%s\n", sb.buf);
 500
 501         strbuf_release(&sb);
 502 }
 503
 504 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 505 {
 506         int i;
 507
 508         for (i = 0; wt[i]; i++) {
 509                 int sha1_len;
 510                 int path_len = strlen(wt[i]->path);
 511
 512                 if (path_len > *maxlen)
 513                         *maxlen = path_len;
 514                 sha1_len = strlen(find_unique_abbrev(wt[i]->head_oid.hash, *abbrev));
 515                 if (sha1_len > *abbrev)
 516                         *abbrev = sha1_len;
 517         }
 518 }
 519
 520 static int list(int ac, const char **av, const char *prefix)
 521 {
 522         int porcelain = 0;
 523
 524         struct option options[] = {
 525                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 526                 OPT_END()
 527         };
 528
 529         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 530         if (ac)
 531                 usage_with_options(worktree_usage, options);
 532         else {
 533                 struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
 534                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 535
 536                 if (!porcelain)
 537                         measure_widths(worktrees, &abbrev, &path_maxlen);
 538
 539                 for (i = 0; worktrees[i]; i++) {
 540                         if (porcelain)
 541                                 show_worktree_porcelain(worktrees[i]);
 542                         else
 543                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 544                 }
 545                 free_worktrees(worktrees);
 546         }
 547         return 0;
 548 }
 549
 550 static int lock_worktree(int ac, const char **av, const char *prefix)
 551 {
 552         const char *reason = "", *old_reason;
 553         struct option options[] = {
 554                 OPT_STRING(0, "reason", &reason, N_("string"),
 555                            N_("reason for locking")),
 556                 OPT_END()
 557         };
 558         struct worktree **worktrees, *wt;
 559
 560         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 561         if (ac != 1)
 562                 usage_with_options(worktree_usage, options);
 563
 564         worktrees = get_worktrees(0);
 565         wt = find_worktree(worktrees, prefix, av[0]);
 566         if (!wt)
 567                 die(_("'%s' is not a working tree"), av[0]);
 568         if (is_main_worktree(wt))
 569                 die(_("The main working tree cannot be locked or unlocked"));
 570
 571         old_reason = is_worktree_locked(wt);
 572         if (old_reason) {
 573                 if (*old_reason)
 574                         die(_("'%s' is already locked, reason: %s"),
 575                             av[0], old_reason);
 576                 die(_("'%s' is already locked"), av[0]);
 577         }
 578
 579         write_file(git_common_path("worktrees/%s/locked", wt->id),
 580                    "%s", reason);
 581         free_worktrees(worktrees);
 582         return 0;
 583 }
 584
 585 static int unlock_worktree(int ac, const char **av, const char *prefix)
 586 {
 587         struct option options[] = {
 588                 OPT_END()
 589         };
 590         struct worktree **worktrees, *wt;
 591         int ret;
 592
 593         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 594         if (ac != 1)
 595                 usage_with_options(worktree_usage, options);
 596
 597         worktrees = get_worktrees(0);
 598         wt = find_worktree(worktrees, prefix, av[0]);
 599         if (!wt)
 600                 die(_("'%s' is not a working tree"), av[0]);
 601         if (is_main_worktree(wt))
 602                 die(_("The main working tree cannot be locked or unlocked"));
 603         if (!is_worktree_locked(wt))
 604                 die(_("'%s' is not locked"), av[0]);
 605         ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 606         free_worktrees(worktrees);
 607         return ret;
 608 }
 609
 610 int cmd_worktree(int ac, const char **av, const char *prefix)
 611 {
 612         struct option options[] = {
 613                 OPT_END()
 614         };
 615
 616         git_config(git_worktree_config, NULL);
 617
 618         if (ac < 2)
 619                 usage_with_options(worktree_usage, options);
 620         if (!prefix)
 621                 prefix = "";
 622         if (!strcmp(av[1], "add"))
 623                 return add(ac - 1, av + 1, prefix);
 624         if (!strcmp(av[1], "prune"))
 625                 return prune(ac - 1, av + 1, prefix);
 626         if (!strcmp(av[1], "list"))
 627                 return list(ac - 1, av + 1, prefix);
 628         if (!strcmp(av[1], "lock"))
 629                 return lock_worktree(ac - 1, av + 1, prefix);
 630         if (!strcmp(av[1], "unlock"))
 631                 return unlock_worktree(ac - 1, av + 1, prefix);
 632         usage_with_options(worktree_usage, options);
 633 }