Andrew's git / gitweb.git / builtin/worktree.c
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builtin / worktree.con commit commit: add short-circuit to paint_down_to_common() (d7c1ec3)
   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
  16static const char * const worktree_usage[] = {
  17        N_("git worktree add [<options>] <path> [<commit-ish>]"),
  18        N_("git worktree list [<options>]"),
  19        N_("git worktree lock [<options>] <path>"),
  20        N_("git worktree prune [<options>]"),
  21        N_("git worktree unlock <path>"),
  22        NULL
  23};
  24
  25struct 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
  34static int show_only;
  35static int verbose;
  36static int guess_remote;
  37static timestamp_t expire;
  38
  39static 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
  49static 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
 122static 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
 155static 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
 173static char *junk_work_tree;
 174static char *junk_git_dir;
 175static int is_junk;
 176static pid_t junk_pid;
 177
 178static 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
 195static void remove_junk_on_signal(int signo)
 196{
 197        remove_junk();
 198        sigchain_pop(signo);
 199        raise(signo);
 200}
 201
 202static 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
 221static 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
 337done:
 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
 360static 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, N_("checkout <branch> even if already checked out in other worktree")),
 369                OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 370                           N_("create a new branch")),
 371                OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 372                           N_("create or reset a branch")),
 373                OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 374                OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
 375                OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
 376                OPT_PASSTHRU(0, "track", &opt_track, NULL,
 377                             N_("set up tracking mode (see git-branch(1))"),
 378                             PARSE_OPT_NOARG | PARSE_OPT_OPTARG),
 379                OPT_BOOL(0, "guess-remote", &guess_remote,
 380                         N_("try to match the new branch name with a remote-tracking branch")),
 381                OPT_END()
 382        };
 383
 384        memset(&opts, 0, sizeof(opts));
 385        opts.checkout = 1;
 386        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 387        if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 388                die(_("-b, -B, and --detach are mutually exclusive"));
 389        if (ac < 1 || ac > 2)
 390                usage_with_options(worktree_usage, options);
 391
 392        path = prefix_filename(prefix, av[0]);
 393        branch = ac < 2 ? "HEAD" : av[1];
 394
 395        if (!strcmp(branch, "-"))
 396                branch = "@{-1}";
 397
 398        opts.force_new_branch = !!new_branch_force;
 399        if (opts.force_new_branch) {
 400                struct strbuf symref = STRBUF_INIT;
 401
 402                opts.new_branch = new_branch_force;
 403
 404                if (!opts.force &&
 405                    !strbuf_check_branch_ref(&symref, opts.new_branch) &&
 406                    ref_exists(symref.buf))
 407                        die_if_checked_out(symref.buf, 0);
 408                strbuf_release(&symref);
 409        }
 410
 411        if (ac < 2 && !opts.new_branch && !opts.detach) {
 412                int n;
 413                const char *s = worktree_basename(path, &n);
 414                opts.new_branch = xstrndup(s, n);
 415                if (guess_remote) {
 416                        struct object_id oid;
 417                        const char *remote =
 418                                unique_tracking_name(opts.new_branch, &oid);
 419                        if (remote)
 420                                branch = remote;
 421                }
 422        }
 423
 424        if (ac == 2 && !opts.new_branch && !opts.detach) {
 425                struct object_id oid;
 426                struct commit *commit;
 427                const char *remote;
 428
 429                commit = lookup_commit_reference_by_name(branch);
 430                if (!commit) {
 431                        remote = unique_tracking_name(branch, &oid);
 432                        if (remote) {
 433                                opts.new_branch = branch;
 434                                branch = remote;
 435                        }
 436                }
 437        }
 438
 439        if (opts.new_branch) {
 440                struct child_process cp = CHILD_PROCESS_INIT;
 441                cp.git_cmd = 1;
 442                argv_array_push(&cp.args, "branch");
 443                if (opts.force_new_branch)
 444                        argv_array_push(&cp.args, "--force");
 445                argv_array_push(&cp.args, opts.new_branch);
 446                argv_array_push(&cp.args, branch);
 447                if (opt_track)
 448                        argv_array_push(&cp.args, opt_track);
 449                if (run_command(&cp))
 450                        return -1;
 451                branch = opts.new_branch;
 452        } else if (opt_track) {
 453                die(_("--[no-]track can only be used if a new branch is created"));
 454        }
 455
 456        UNLEAK(path);
 457        UNLEAK(opts);
 458        return add_worktree(path, branch, &opts);
 459}
 460
 461static void show_worktree_porcelain(struct worktree *wt)
 462{
 463        printf("worktree %s\n", wt->path);
 464        if (wt->is_bare)
 465                printf("bare\n");
 466        else {
 467                printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
 468                if (wt->is_detached)
 469                        printf("detached\n");
 470                else if (wt->head_ref)
 471                        printf("branch %s\n", wt->head_ref);
 472        }
 473        printf("\n");
 474}
 475
 476static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 477{
 478        struct strbuf sb = STRBUF_INIT;
 479        int cur_path_len = strlen(wt->path);
 480        int path_adj = cur_path_len - utf8_strwidth(wt->path);
 481
 482        strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 483        if (wt->is_bare)
 484                strbuf_addstr(&sb, "(bare)");
 485        else {
 486                strbuf_addf(&sb, "%-*s ", abbrev_len,
 487                                find_unique_abbrev(wt->head_oid.hash, DEFAULT_ABBREV));
 488                if (wt->is_detached)
 489                        strbuf_addstr(&sb, "(detached HEAD)");
 490                else if (wt->head_ref) {
 491                        char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
 492                        strbuf_addf(&sb, "[%s]", ref);
 493                        free(ref);
 494                } else
 495                        strbuf_addstr(&sb, "(error)");
 496        }
 497        printf("%s\n", sb.buf);
 498
 499        strbuf_release(&sb);
 500}
 501
 502static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 503{
 504        int i;
 505
 506        for (i = 0; wt[i]; i++) {
 507                int sha1_len;
 508                int path_len = strlen(wt[i]->path);
 509
 510                if (path_len > *maxlen)
 511                        *maxlen = path_len;
 512                sha1_len = strlen(find_unique_abbrev(wt[i]->head_oid.hash, *abbrev));
 513                if (sha1_len > *abbrev)
 514                        *abbrev = sha1_len;
 515        }
 516}
 517
 518static int list(int ac, const char **av, const char *prefix)
 519{
 520        int porcelain = 0;
 521
 522        struct option options[] = {
 523                OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 524                OPT_END()
 525        };
 526
 527        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 528        if (ac)
 529                usage_with_options(worktree_usage, options);
 530        else {
 531                struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
 532                int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 533
 534                if (!porcelain)
 535                        measure_widths(worktrees, &abbrev, &path_maxlen);
 536
 537                for (i = 0; worktrees[i]; i++) {
 538                        if (porcelain)
 539                                show_worktree_porcelain(worktrees[i]);
 540                        else
 541                                show_worktree(worktrees[i], path_maxlen, abbrev);
 542                }
 543                free_worktrees(worktrees);
 544        }
 545        return 0;
 546}
 547
 548static int lock_worktree(int ac, const char **av, const char *prefix)
 549{
 550        const char *reason = "", *old_reason;
 551        struct option options[] = {
 552                OPT_STRING(0, "reason", &reason, N_("string"),
 553                           N_("reason for locking")),
 554                OPT_END()
 555        };
 556        struct worktree **worktrees, *wt;
 557
 558        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 559        if (ac != 1)
 560                usage_with_options(worktree_usage, options);
 561
 562        worktrees = get_worktrees(0);
 563        wt = find_worktree(worktrees, prefix, av[0]);
 564        if (!wt)
 565                die(_("'%s' is not a working tree"), av[0]);
 566        if (is_main_worktree(wt))
 567                die(_("The main working tree cannot be locked or unlocked"));
 568
 569        old_reason = is_worktree_locked(wt);
 570        if (old_reason) {
 571                if (*old_reason)
 572                        die(_("'%s' is already locked, reason: %s"),
 573                            av[0], old_reason);
 574                die(_("'%s' is already locked"), av[0]);
 575        }
 576
 577        write_file(git_common_path("worktrees/%s/locked", wt->id),
 578                   "%s", reason);
 579        free_worktrees(worktrees);
 580        return 0;
 581}
 582
 583static int unlock_worktree(int ac, const char **av, const char *prefix)
 584{
 585        struct option options[] = {
 586                OPT_END()
 587        };
 588        struct worktree **worktrees, *wt;
 589        int ret;
 590
 591        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 592        if (ac != 1)
 593                usage_with_options(worktree_usage, options);
 594
 595        worktrees = get_worktrees(0);
 596        wt = find_worktree(worktrees, prefix, av[0]);
 597        if (!wt)
 598                die(_("'%s' is not a working tree"), av[0]);
 599        if (is_main_worktree(wt))
 600                die(_("The main working tree cannot be locked or unlocked"));
 601        if (!is_worktree_locked(wt))
 602                die(_("'%s' is not locked"), av[0]);
 603        ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
 604        free_worktrees(worktrees);
 605        return ret;
 606}
 607
 608int cmd_worktree(int ac, const char **av, const char *prefix)
 609{
 610        struct option options[] = {
 611                OPT_END()
 612        };
 613
 614        git_config(git_worktree_config, NULL);
 615
 616        if (ac < 2)
 617                usage_with_options(worktree_usage, options);
 618        if (!prefix)
 619                prefix = "";
 620        if (!strcmp(av[1], "add"))
 621                return add(ac - 1, av + 1, prefix);
 622        if (!strcmp(av[1], "prune"))
 623                return prune(ac - 1, av + 1, prefix);
 624        if (!strcmp(av[1], "list"))
 625                return list(ac - 1, av + 1, prefix);
 626        if (!strcmp(av[1], "lock"))
 627                return lock_worktree(ac - 1, av + 1, prefix);
 628        if (!strcmp(av[1], "unlock"))
 629                return unlock_worktree(ac - 1, av + 1, prefix);
 630        usage_with_options(worktree_usage, options);
 631}