builtin/worktree.c

   1 #include "cache.h"
   2 #include "builtin.h"
   3 #include "dir.h"
   4 #include "parse-options.h"
   5 #include "argv-array.h"
   6 #include "branch.h"
   7 #include "refs.h"
   8 #include "run-command.h"
   9 #include "sigchain.h"
  10 #include "refs.h"
  11 #include "utf8.h"
  12 #include "worktree.h"
  13
  14 static const char * const worktree_usage[] = {
  15         N_("git worktree add [<options>] <path> [<branch>]"),
  16         N_("git worktree list [<options>]"),
  17         N_("git worktree lock [<options>] <path>"),
  18         N_("git worktree prune [<options>]"),
  19         N_("git worktree unlock <path>"),
  20         NULL
  21 };
  22
  23 struct add_opts {
  24         int force;
  25         int detach;
  26         int checkout;
  27         const char *new_branch;
  28         int force_new_branch;
  29 };
  30
  31 static int show_only;
  32 static int verbose;
  33 static unsigned long expire;
  34
  35 static int prune_worktree(const char *id, struct strbuf *reason)
  36 {
  37         struct stat st;
  38         char *path;
  39         int fd, len;
  40
  41         if (!is_directory(git_path("worktrees/%s", id))) {
  42                 strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  43                 return 1;
  44         }
  45         if (file_exists(git_path("worktrees/%s/locked", id)))
  46                 return 0;
  47         if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  48                 strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  49                 return 1;
  50         }
  51         fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  52         if (fd < 0) {
  53                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  54                             id, strerror(errno));
  55                 return 1;
  56         }
  57         len = st.st_size;
  58         path = xmallocz(len);
  59         read_in_full(fd, path, len);
  60         close(fd);
  61         while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
  62                 len--;
  63         if (!len) {
  64                 strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
  65                 free(path);
  66                 return 1;
  67         }
  68         path[len] = '\0';
  69         if (!file_exists(path)) {
  70                 struct stat st_link;
  71                 free(path);
  72                 /*
  73                  * the repo is moved manually and has not been
  74                  * accessed since?
  75                  */
  76                 if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
  77                     st_link.st_nlink > 1)
  78                         return 0;
  79                 if (st.st_mtime <= expire) {
  80                         strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
  81                         return 1;
  82                 } else {
  83                         return 0;
  84                 }
  85         }
  86         free(path);
  87         return 0;
  88 }
  89
  90 static void prune_worktrees(void)
  91 {
  92         struct strbuf reason = STRBUF_INIT;
  93         struct strbuf path = STRBUF_INIT;
  94         DIR *dir = opendir(git_path("worktrees"));
  95         struct dirent *d;
  96         int ret;
  97         if (!dir)
  98                 return;
  99         while ((d = readdir(dir)) != NULL) {
 100                 if (is_dot_or_dotdot(d->d_name))
 101                         continue;
 102                 strbuf_reset(&reason);
 103                 if (!prune_worktree(d->d_name, &reason))
 104                         continue;
 105                 if (show_only || verbose)
 106                         printf("%s\n", reason.buf);
 107                 if (show_only)
 108                         continue;
 109                 strbuf_reset(&path);
 110                 strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
 111                 ret = remove_dir_recursively(&path, 0);
 112                 if (ret < 0 && errno == ENOTDIR)
 113                         ret = unlink(path.buf);
 114                 if (ret)
 115                         error_errno(_("failed to remove '%s'"), path.buf);
 116         }
 117         closedir(dir);
 118         if (!show_only)
 119                 rmdir(git_path("worktrees"));
 120         strbuf_release(&reason);
 121         strbuf_release(&path);
 122 }
 123
 124 static int prune(int ac, const char **av, const char *prefix)
 125 {
 126         struct option options[] = {
 127                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 128                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 129                 OPT_EXPIRY_DATE(0, "expire", &expire,
 130                                 N_("expire objects older than <time>")),
 131                 OPT_END()
 132         };
 133
 134         expire = ULONG_MAX;
 135         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 136         if (ac)
 137                 usage_with_options(worktree_usage, options);
 138         prune_worktrees();
 139         return 0;
 140 }
 141
 142 static char *junk_work_tree;
 143 static char *junk_git_dir;
 144 static int is_junk;
 145 static pid_t junk_pid;
 146
 147 static void remove_junk(void)
 148 {
 149         struct strbuf sb = STRBUF_INIT;
 150         if (!is_junk || getpid() != junk_pid)
 151                 return;
 152         if (junk_git_dir) {
 153                 strbuf_addstr(&sb, junk_git_dir);
 154                 remove_dir_recursively(&sb, 0);
 155                 strbuf_reset(&sb);
 156         }
 157         if (junk_work_tree) {
 158                 strbuf_addstr(&sb, junk_work_tree);
 159                 remove_dir_recursively(&sb, 0);
 160         }
 161         strbuf_release(&sb);
 162 }
 163
 164 static void remove_junk_on_signal(int signo)
 165 {
 166         remove_junk();
 167         sigchain_pop(signo);
 168         raise(signo);
 169 }
 170
 171 static const char *worktree_basename(const char *path, int *olen)
 172 {
 173         const char *name;
 174         int len;
 175
 176         len = strlen(path);
 177         while (len && is_dir_sep(path[len - 1]))
 178                 len--;
 179
 180         for (name = path + len - 1; name > path; name--)
 181                 if (is_dir_sep(*name)) {
 182                         name++;
 183                         break;
 184                 }
 185
 186         *olen = len;
 187         return name;
 188 }
 189
 190 static int add_worktree(const char *path, const char *refname,
 191                         const struct add_opts *opts)
 192 {
 193         struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 194         struct strbuf sb = STRBUF_INIT;
 195         const char *name;
 196         struct stat st;
 197         struct child_process cp = CHILD_PROCESS_INIT;
 198         struct argv_array child_env = ARGV_ARRAY_INIT;
 199         int counter = 0, len, ret;
 200         struct strbuf symref = STRBUF_INIT;
 201         struct commit *commit = NULL;
 202
 203         if (file_exists(path) && !is_empty_dir(path))
 204                 die(_("'%s' already exists"), path);
 205
 206         /* is 'refname' a branch or commit? */
 207         if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 208                  ref_exists(symref.buf)) { /* it's a branch */
 209                 if (!opts->force)
 210                         die_if_checked_out(symref.buf, 0);
 211         } else { /* must be a commit */
 212                 commit = lookup_commit_reference_by_name(refname);
 213                 if (!commit)
 214                         die(_("invalid reference: %s"), refname);
 215         }
 216
 217         name = worktree_basename(path, &len);
 218         strbuf_addstr(&sb_repo,
 219                       git_path("worktrees/%.*s", (int)(path + len - name), name));
 220         len = sb_repo.len;
 221         if (safe_create_leading_directories_const(sb_repo.buf))
 222                 die_errno(_("could not create leading directories of '%s'"),
 223                           sb_repo.buf);
 224         while (!stat(sb_repo.buf, &st)) {
 225                 counter++;
 226                 strbuf_setlen(&sb_repo, len);
 227                 strbuf_addf(&sb_repo, "%d", counter);
 228         }
 229         name = strrchr(sb_repo.buf, '/') + 1;
 230
 231         junk_pid = getpid();
 232         atexit(remove_junk);
 233         sigchain_push_common(remove_junk_on_signal);
 234
 235         if (mkdir(sb_repo.buf, 0777))
 236                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 237         junk_git_dir = xstrdup(sb_repo.buf);
 238         is_junk = 1;
 239
 240         /*
 241          * lock the incomplete repo so prune won't delete it, unlock
 242          * after the preparation is over.
 243          */
 244         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 245         write_file(sb.buf, "initializing");
 246
 247         strbuf_addf(&sb_git, "%s/.git", path);
 248         if (safe_create_leading_directories_const(sb_git.buf))
 249                 die_errno(_("could not create leading directories of '%s'"),
 250                           sb_git.buf);
 251         junk_work_tree = xstrdup(path);
 252
 253         strbuf_reset(&sb);
 254         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 255         write_file(sb.buf, "%s", real_path(sb_git.buf));
 256         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 257                    real_path(get_git_common_dir()), name);
 258         /*
 259          * This is to keep resolve_ref() happy. We need a valid HEAD
 260          * or is_git_directory() will reject the directory. Any value which
 261          * looks like an object ID will do since it will be immediately
 262          * replaced by the symbolic-ref or update-ref invocation in the new
 263          * worktree.
 264          */
 265         strbuf_reset(&sb);
 266         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 267         write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
 268         strbuf_reset(&sb);
 269         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 270         write_file(sb.buf, "../..");
 271
 272         fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
 273
 274         argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 275         argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 276         cp.git_cmd = 1;
 277
 278         if (commit)
 279                 argv_array_pushl(&cp.args, "update-ref", "HEAD",
 280                                  oid_to_hex(&commit->object.oid), NULL);
 281         else
 282                 argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 283                                  symref.buf, NULL);
 284         cp.env = child_env.argv;
 285         ret = run_command(&cp);
 286         if (ret)
 287                 goto done;
 288
 289         if (opts->checkout) {
 290                 cp.argv = NULL;
 291                 argv_array_clear(&cp.args);
 292                 argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 293                 cp.env = child_env.argv;
 294                 ret = run_command(&cp);
 295                 if (ret)
 296                         goto done;
 297         }
 298
 299         is_junk = 0;
 300         free(junk_work_tree);
 301         free(junk_git_dir);
 302         junk_work_tree = NULL;
 303         junk_git_dir = NULL;
 304
 305 done:
 306         strbuf_reset(&sb);
 307         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 308         unlink_or_warn(sb.buf);
 309         argv_array_clear(&child_env);
 310         strbuf_release(&sb);
 311         strbuf_release(&symref);
 312         strbuf_release(&sb_repo);
 313         strbuf_release(&sb_git);
 314         return ret;
 315 }
 316
 317 static int add(int ac, const char **av, const char *prefix)
 318 {
 319         struct add_opts opts;
 320         const char *new_branch_force = NULL;
 321         const char *path, *branch;
 322         struct option options[] = {
 323                 OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
 324                 OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 325                            N_("create a new branch")),
 326                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 327                            N_("create or reset a branch")),
 328                 OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 329                 OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 330                 OPT_END()
 331         };
 332
 333         memset(&opts, 0, sizeof(opts));
 334         opts.checkout = 1;
 335         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 336         if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 337                 die(_("-b, -B, and --detach are mutually exclusive"));
 338         if (ac < 1 || ac > 2)
 339                 usage_with_options(worktree_usage, options);
 340
 341         path = prefix_filename(prefix, strlen(prefix), av[0]);
 342         branch = ac < 2 ? "HEAD" : av[1];
 343
 344         if (!strcmp(branch, "-"))
 345                 branch = "@{-1}";
 346
 347         opts.force_new_branch = !!new_branch_force;
 348         if (opts.force_new_branch) {
 349                 struct strbuf symref = STRBUF_INIT;
 350
 351                 opts.new_branch = new_branch_force;
 352
 353                 if (!opts.force &&
 354                     !strbuf_check_branch_ref(&symref, opts.new_branch) &&
 355                     ref_exists(symref.buf))
 356                         die_if_checked_out(symref.buf, 0);
 357                 strbuf_release(&symref);
 358         }
 359
 360         if (ac < 2 && !opts.new_branch && !opts.detach) {
 361                 int n;
 362                 const char *s = worktree_basename(path, &n);
 363                 opts.new_branch = xstrndup(s, n);
 364         }
 365
 366         if (opts.new_branch) {
 367                 struct child_process cp = CHILD_PROCESS_INIT;
 368                 cp.git_cmd = 1;
 369                 argv_array_push(&cp.args, "branch");
 370                 if (opts.force_new_branch)
 371                         argv_array_push(&cp.args, "--force");
 372                 argv_array_push(&cp.args, opts.new_branch);
 373                 argv_array_push(&cp.args, branch);
 374                 if (run_command(&cp))
 375                         return -1;
 376                 branch = opts.new_branch;
 377         }
 378
 379         return add_worktree(path, branch, &opts);
 380 }
 381
 382 static void show_worktree_porcelain(struct worktree *wt)
 383 {
 384         printf("worktree %s\n", wt->path);
 385         if (wt->is_bare)
 386                 printf("bare\n");
 387         else {
 388                 printf("HEAD %s\n", sha1_to_hex(wt->head_sha1));
 389                 if (wt->is_detached)
 390                         printf("detached\n");
 391                 else
 392                         printf("branch %s\n", wt->head_ref);
 393         }
 394         printf("\n");
 395 }
 396
 397 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 398 {
 399         struct strbuf sb = STRBUF_INIT;
 400         int cur_path_len = strlen(wt->path);
 401         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 402
 403         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 404         if (wt->is_bare)
 405                 strbuf_addstr(&sb, "(bare)");
 406         else {
 407                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 408                                 find_unique_abbrev(wt->head_sha1, DEFAULT_ABBREV));
 409                 if (!wt->is_detached)
 410                         strbuf_addf(&sb, "[%s]", shorten_unambiguous_ref(wt->head_ref, 0));
 411                 else
 412                         strbuf_addstr(&sb, "(detached HEAD)");
 413         }
 414         printf("%s\n", sb.buf);
 415
 416         strbuf_release(&sb);
 417 }
 418
 419 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 420 {
 421         int i;
 422
 423         for (i = 0; wt[i]; i++) {
 424                 int sha1_len;
 425                 int path_len = strlen(wt[i]->path);
 426
 427                 if (path_len > *maxlen)
 428                         *maxlen = path_len;
 429                 sha1_len = strlen(find_unique_abbrev(wt[i]->head_sha1, *abbrev));
 430                 if (sha1_len > *abbrev)
 431                         *abbrev = sha1_len;
 432         }
 433 }
 434
 435 static int list(int ac, const char **av, const char *prefix)
 436 {
 437         int porcelain = 0;
 438
 439         struct option options[] = {
 440                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 441                 OPT_END()
 442         };
 443
 444         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 445         if (ac)
 446                 usage_with_options(worktree_usage, options);
 447         else {
 448                 struct worktree **worktrees = get_worktrees();
 449                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 450
 451                 if (!porcelain)
 452                         measure_widths(worktrees, &abbrev, &path_maxlen);
 453
 454                 for (i = 0; worktrees[i]; i++) {
 455                         if (porcelain)
 456                                 show_worktree_porcelain(worktrees[i]);
 457                         else
 458                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 459                 }
 460                 free_worktrees(worktrees);
 461         }
 462         return 0;
 463 }
 464
 465 static int lock_worktree(int ac, const char **av, const char *prefix)
 466 {
 467         const char *reason = "", *old_reason;
 468         struct option options[] = {
 469                 OPT_STRING(0, "reason", &reason, N_("string"),
 470                            N_("reason for locking")),
 471                 OPT_END()
 472         };
 473         struct worktree **worktrees, *wt;
 474
 475         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 476         if (ac != 1)
 477                 usage_with_options(worktree_usage, options);
 478
 479         worktrees = get_worktrees();
 480         wt = find_worktree(worktrees, prefix, av[0]);
 481         if (!wt)
 482                 die(_("'%s' is not a working tree"), av[0]);
 483         if (is_main_worktree(wt))
 484                 die(_("The main working tree cannot be locked or unlocked"));
 485
 486         old_reason = is_worktree_locked(wt);
 487         if (old_reason) {
 488                 if (*old_reason)
 489                         die(_("'%s' is already locked, reason: %s"),
 490                             av[0], old_reason);
 491                 die(_("'%s' is already locked"), av[0]);
 492         }
 493
 494         write_file(git_common_path("worktrees/%s/locked", wt->id),
 495                    "%s", reason);
 496         free_worktrees(worktrees);
 497         return 0;
 498 }
 499
 500 static int unlock_worktree(int ac, const char **av, const char *prefix)
 501 {
 502         struct option options[] = {
 503                 OPT_END()
 504         };
 505         struct worktree **worktrees, *wt;
 506         int ret;
 507
 508         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 509         if (ac != 1)
 510                 usage_with_options(worktree_usage, options);
 511
 512         worktrees = get_worktrees();
 513         wt = find_worktree(worktrees, prefix, av[0]);
 514         if (!wt)
 515                 die(_("'%s' is not a working tree"), av[0]);
 516         if (is_main_worktree(wt))
 517                 die(_("The main working tree cannot be locked or unlocked"));
 518         if (!is_worktree_locked(wt))
 519                 die(_("'%s' is not locked"), av[0]);
 520         ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 521         free_worktrees(worktrees);
 522         return ret;
 523 }
 524
 525 int cmd_worktree(int ac, const char **av, const char *prefix)
 526 {
 527         struct option options[] = {
 528                 OPT_END()
 529         };
 530
 531         if (ac < 2)
 532                 usage_with_options(worktree_usage, options);
 533         if (!prefix)
 534                 prefix = "";
 535         if (!strcmp(av[1], "add"))
 536                 return add(ac - 1, av + 1, prefix);
 537         if (!strcmp(av[1], "prune"))
 538                 return prune(ac - 1, av + 1, prefix);
 539         if (!strcmp(av[1], "list"))
 540                 return list(ac - 1, av + 1, prefix);
 541         if (!strcmp(av[1], "lock"))
 542                 return lock_worktree(ac - 1, av + 1, prefix);
 543         if (!strcmp(av[1], "unlock"))
 544                 return unlock_worktree(ac - 1, av + 1, prefix);
 545         usage_with_options(worktree_usage, options);
 546 }