Andrew's git / gitweb.git / builtin/worktree.c
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builtin / worktree.con commit use CHILD_PROCESS_INIT to initialize automatic variables (542aa25)
   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
  14static 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
  23struct add_opts {
  24        int force;
  25        int detach;
  26        int checkout;
  27        const char *new_branch;
  28        int force_new_branch;
  29};
  30
  31static int show_only;
  32static int verbose;
  33static unsigned long expire;
  34
  35static 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
  90static 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
 124static 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
 142static char *junk_work_tree;
 143static char *junk_git_dir;
 144static int is_junk;
 145static pid_t junk_pid;
 146
 147static 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
 164static void remove_junk_on_signal(int signo)
 165{
 166        remove_junk();
 167        sigchain_pop(signo);
 168        raise(signo);
 169}
 170
 171static 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
 190static 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
 305done:
 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
 317static 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
 382static 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
 397static 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
 419static 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
 435static 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
 465static 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
 500static 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
 525int 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}