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
 234         if (file_exists(path) && !is_empty_dir(path))
 235                 die(_("'%s' already exists"), path);
 236
 237         /* is 'refname' a branch or commit? */
 238         if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 239                  ref_exists(symref.buf)) { /* it's a branch */
 240                 if (!opts->force)
 241                         die_if_checked_out(symref.buf, 0);
 242         } else { /* must be a commit */
 243                 commit = lookup_commit_reference_by_name(refname);
 244                 if (!commit)
 245                         die(_("invalid reference: %s"), refname);
 246         }
 247
 248         name = worktree_basename(path, &len);
 249         git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
 250         len = sb_repo.len;
 251         if (safe_create_leading_directories_const(sb_repo.buf))
 252                 die_errno(_("could not create leading directories of '%s'"),
 253                           sb_repo.buf);
 254         while (!stat(sb_repo.buf, &st)) {
 255                 counter++;
 256                 strbuf_setlen(&sb_repo, len);
 257                 strbuf_addf(&sb_repo, "%d", counter);
 258         }
 259         name = strrchr(sb_repo.buf, '/') + 1;
 260
 261         junk_pid = getpid();
 262         atexit(remove_junk);
 263         sigchain_push_common(remove_junk_on_signal);
 264
 265         if (mkdir(sb_repo.buf, 0777))
 266                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 267         junk_git_dir = xstrdup(sb_repo.buf);
 268         is_junk = 1;
 269
 270         /*
 271          * lock the incomplete repo so prune won't delete it, unlock
 272          * after the preparation is over.
 273          */
 274         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 275         if (!opts->keep_locked)
 276                 write_file(sb.buf, "initializing");
 277         else
 278                 write_file(sb.buf, "added with --lock");
 279
 280         strbuf_addf(&sb_git, "%s/.git", path);
 281         if (safe_create_leading_directories_const(sb_git.buf))
 282                 die_errno(_("could not create leading directories of '%s'"),
 283                           sb_git.buf);
 284         junk_work_tree = xstrdup(path);
 285
 286         strbuf_reset(&sb);
 287         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 288         write_file(sb.buf, "%s", real_path(sb_git.buf));
 289         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 290                    real_path(get_git_common_dir()), name);
 291         /*
 292          * This is to keep resolve_ref() happy. We need a valid HEAD
 293          * or is_git_directory() will reject the directory. Any value which
 294          * looks like an object ID will do since it will be immediately
 295          * replaced by the symbolic-ref or update-ref invocation in the new
 296          * worktree.
 297          */
 298         strbuf_reset(&sb);
 299         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 300         write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
 301         strbuf_reset(&sb);
 302         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 303         write_file(sb.buf, "../..");
 304
 305         fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
 306
 307         argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 308         argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 309         cp.git_cmd = 1;
 310
 311         if (commit)
 312                 argv_array_pushl(&cp.args, "update-ref", "HEAD",
 313                                  oid_to_hex(&commit->object.oid), NULL);
 314         else
 315                 argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 316                                  symref.buf, NULL);
 317         cp.env = child_env.argv;
 318         ret = run_command(&cp);
 319         if (ret)
 320                 goto done;
 321
 322         if (opts->checkout) {
 323                 cp.argv = NULL;
 324                 argv_array_clear(&cp.args);
 325                 argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 326                 cp.env = child_env.argv;
 327                 ret = run_command(&cp);
 328                 if (ret)
 329                         goto done;
 330         }
 331
 332         is_junk = 0;
 333         FREE_AND_NULL(junk_work_tree);
 334         FREE_AND_NULL(junk_git_dir);
 335
 336 done:
 337         if (ret || !opts->keep_locked) {
 338                 strbuf_reset(&sb);
 339                 strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 340                 unlink_or_warn(sb.buf);
 341         }
 342         argv_array_clear(&child_env);
 343         strbuf_release(&sb);
 344         strbuf_release(&symref);
 345         strbuf_release(&sb_repo);
 346         strbuf_release(&sb_git);
 347         return ret;
 348 }
 349
 350 static int add(int ac, const char **av, const char *prefix)
 351 {
 352         struct add_opts opts;
 353         const char *new_branch_force = NULL;
 354         char *path;
 355         const char *branch;
 356         const char *opt_track = NULL;
 357         struct option options[] = {
 358                 OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
 359                 OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 360                            N_("create a new branch")),
 361                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 362                            N_("create or reset a branch")),
 363                 OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 364                 OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 365                 OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
 366                 OPT_PASSTHRU(0, "track", &opt_track, NULL,
 367                              N_("set up tracking mode (see git-branch(1))"),
 368                              PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
 369                 OPT_BOOL(0, "guess-remote", &guess_remote,
 370                          N_("try to match the new branch name with a remote-tracking branch")),
 371                 OPT_END()
 372         };
 373
 374         memset(&opts, 0, sizeof(opts));
 375         opts.checkout = 1;
 376         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 377         if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 378                 die(_("-b, -B, and --detach are mutually exclusive"));
 379         if (ac < 1 || ac > 2)
 380                 usage_with_options(worktree_usage, options);
 381
 382         path = prefix_filename(prefix, av[0]);
 383         branch = ac < 2 ? "HEAD" : av[1];
 384
 385         if (!strcmp(branch, "-"))
 386                 branch = "@{-1}";
 387
 388         opts.force_new_branch = !!new_branch_force;
 389         if (opts.force_new_branch) {
 390                 struct strbuf symref = STRBUF_INIT;
 391
 392                 opts.new_branch = new_branch_force;
 393
 394                 if (!opts.force &&
 395                     !strbuf_check_branch_ref(&symref, opts.new_branch) &&
 396                     ref_exists(symref.buf))
 397                         die_if_checked_out(symref.buf, 0);
 398                 strbuf_release(&symref);
 399         }
 400
 401         if (ac < 2 && !opts.new_branch && !opts.detach) {
 402                 int n;
 403                 const char *s = worktree_basename(path, &n);
 404                 opts.new_branch = xstrndup(s, n);
 405                 if (guess_remote) {
 406                         struct object_id oid;
 407                         const char *remote =
 408                                 unique_tracking_name(opts.new_branch, &oid);
 409                         if (remote)
 410                                 branch = remote;
 411                 }
 412         }
 413
 414         if (ac == 2 && !opts.new_branch && !opts.detach) {
 415                 struct object_id oid;
 416                 struct commit *commit;
 417                 const char *remote;
 418
 419                 commit = lookup_commit_reference_by_name(branch);
 420                 if (!commit) {
 421                         remote = unique_tracking_name(branch, &oid);
 422                         if (remote) {
 423                                 opts.new_branch = branch;
 424                                 branch = remote;
 425                         }
 426                 }
 427         }
 428
 429         if (opts.new_branch) {
 430                 struct child_process cp = CHILD_PROCESS_INIT;
 431                 cp.git_cmd = 1;
 432                 argv_array_push(&cp.args, "branch");
 433                 if (opts.force_new_branch)
 434                         argv_array_push(&cp.args, "--force");
 435                 argv_array_push(&cp.args, opts.new_branch);
 436                 argv_array_push(&cp.args, branch);
 437                 if (opt_track)
 438                         argv_array_push(&cp.args, opt_track);
 439                 if (run_command(&cp))
 440                         return -1;
 441                 branch = opts.new_branch;
 442         } else if (opt_track) {
 443                 die(_("--[no-]track can only be used if a new branch is created"));
 444         }
 445
 446         UNLEAK(path);
 447         UNLEAK(opts);
 448         return add_worktree(path, branch, &opts);
 449 }
 450
 451 static void show_worktree_porcelain(struct worktree *wt)
 452 {
 453         printf("worktree %s\n", wt->path);
 454         if (wt->is_bare)
 455                 printf("bare\n");
 456         else {
 457                 printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
 458                 if (wt->is_detached)
 459                         printf("detached\n");
 460                 else if (wt->head_ref)
 461                         printf("branch %s\n", wt->head_ref);
 462         }
 463         printf("\n");
 464 }
 465
 466 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 467 {
 468         struct strbuf sb = STRBUF_INIT;
 469         int cur_path_len = strlen(wt->path);
 470         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 471
 472         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 473         if (wt->is_bare)
 474                 strbuf_addstr(&sb, "(bare)");
 475         else {
 476                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 477                                 find_unique_abbrev(wt->head_oid.hash, DEFAULT_ABBREV));
 478                 if (wt->is_detached)
 479                         strbuf_addstr(&sb, "(detached HEAD)");
 480                 else if (wt->head_ref) {
 481                         char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
 482                         strbuf_addf(&sb, "[%s]", ref);
 483                         free(ref);
 484                 } else
 485                         strbuf_addstr(&sb, "(error)");
 486         }
 487         printf("%s\n", sb.buf);
 488
 489         strbuf_release(&sb);
 490 }
 491
 492 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 493 {
 494         int i;
 495
 496         for (i = 0; wt[i]; i++) {
 497                 int sha1_len;
 498                 int path_len = strlen(wt[i]->path);
 499
 500                 if (path_len > *maxlen)
 501                         *maxlen = path_len;
 502                 sha1_len = strlen(find_unique_abbrev(wt[i]->head_oid.hash, *abbrev));
 503                 if (sha1_len > *abbrev)
 504                         *abbrev = sha1_len;
 505         }
 506 }
 507
 508 static int list(int ac, const char **av, const char *prefix)
 509 {
 510         int porcelain = 0;
 511
 512         struct option options[] = {
 513                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 514                 OPT_END()
 515         };
 516
 517         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 518         if (ac)
 519                 usage_with_options(worktree_usage, options);
 520         else {
 521                 struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
 522                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 523
 524                 if (!porcelain)
 525                         measure_widths(worktrees, &abbrev, &path_maxlen);
 526
 527                 for (i = 0; worktrees[i]; i++) {
 528                         if (porcelain)
 529                                 show_worktree_porcelain(worktrees[i]);
 530                         else
 531                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 532                 }
 533                 free_worktrees(worktrees);
 534         }
 535         return 0;
 536 }
 537
 538 static int lock_worktree(int ac, const char **av, const char *prefix)
 539 {
 540         const char *reason = "", *old_reason;
 541         struct option options[] = {
 542                 OPT_STRING(0, "reason", &reason, N_("string"),
 543                            N_("reason for locking")),
 544                 OPT_END()
 545         };
 546         struct worktree **worktrees, *wt;
 547
 548         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 549         if (ac != 1)
 550                 usage_with_options(worktree_usage, options);
 551
 552         worktrees = get_worktrees(0);
 553         wt = find_worktree(worktrees, prefix, av[0]);
 554         if (!wt)
 555                 die(_("'%s' is not a working tree"), av[0]);
 556         if (is_main_worktree(wt))
 557                 die(_("The main working tree cannot be locked or unlocked"));
 558
 559         old_reason = is_worktree_locked(wt);
 560         if (old_reason) {
 561                 if (*old_reason)
 562                         die(_("'%s' is already locked, reason: %s"),
 563                             av[0], old_reason);
 564                 die(_("'%s' is already locked"), av[0]);
 565         }
 566
 567         write_file(git_common_path("worktrees/%s/locked", wt->id),
 568                    "%s", reason);
 569         free_worktrees(worktrees);
 570         return 0;
 571 }
 572
 573 static int unlock_worktree(int ac, const char **av, const char *prefix)
 574 {
 575         struct option options[] = {
 576                 OPT_END()
 577         };
 578         struct worktree **worktrees, *wt;
 579         int ret;
 580
 581         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 582         if (ac != 1)
 583                 usage_with_options(worktree_usage, options);
 584
 585         worktrees = get_worktrees(0);
 586         wt = find_worktree(worktrees, prefix, av[0]);
 587         if (!wt)
 588                 die(_("'%s' is not a working tree"), av[0]);
 589         if (is_main_worktree(wt))
 590                 die(_("The main working tree cannot be locked or unlocked"));
 591         if (!is_worktree_locked(wt))
 592                 die(_("'%s' is not locked"), av[0]);
 593         ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 594         free_worktrees(worktrees);
 595         return ret;
 596 }
 597
 598 int cmd_worktree(int ac, const char **av, const char *prefix)
 599 {
 600         struct option options[] = {
 601                 OPT_END()
 602         };
 603
 604         git_config(git_worktree_config, NULL);
 605
 606         if (ac < 2)
 607                 usage_with_options(worktree_usage, options);
 608         if (!prefix)
 609                 prefix = "";
 610         if (!strcmp(av[1], "add"))
 611                 return add(ac - 1, av + 1, prefix);
 612         if (!strcmp(av[1], "prune"))
 613                 return prune(ac - 1, av + 1, prefix);
 614         if (!strcmp(av[1], "list"))
 615                 return list(ac - 1, av + 1, prefix);
 616         if (!strcmp(av[1], "lock"))
 617                 return lock_worktree(ac - 1, av + 1, prefix);
 618         if (!strcmp(av[1], "unlock"))
 619                 return unlock_worktree(ac - 1, av + 1, prefix);
 620         usage_with_options(worktree_usage, options);
 621 }