scalar.c

   1 /*
   2  * The Scalar command-line interface.
   3  */
   4
   5 #include "cache.h"
   6 #include "gettext.h"
   7 #include "parse-options.h"
   8 #include "config.h"
   9 #include "run-command.h"
  10 #include "simple-ipc.h"
  11 #include "fsmonitor-ipc.h"
  12 #include "fsmonitor-settings.h"
  13 #include "refs.h"
  14 #include "dir.h"
  15 #include "packfile.h"
  16 #include "help.h"
  17
  18 static void setup_enlistment_directory(int argc, const char **argv,
  19                                        const char * const *usagestr,
  20                                        const struct option *options,
  21                                        struct strbuf *enlistment_root)
  22 {
  23         struct strbuf path = STRBUF_INIT;
  24         int enlistment_is_repo_parent = 0;
  25         size_t len;
  26
  27         if (startup_info->have_repository)
  28                 BUG("gitdir already set up?!?");
  29
  30         if (argc > 1)
  31                 usage_with_options(usagestr, options);
  32
  33         /* find the worktree, determine its corresponding root */
  34         if (argc == 1) {
  35                 strbuf_add_absolute_path(&path, argv[0]);
  36                 if (!is_directory(path.buf))
  37                         die(_("'%s' does not exist"), path.buf);
  38                 if (chdir(path.buf) < 0)
  39                         die_errno(_("could not switch to '%s'"), path.buf);
  40         } else if (strbuf_getcwd(&path) < 0)
  41                 die(_("need a working directory"));
  42
  43         strbuf_trim_trailing_dir_sep(&path);
  44
  45         /* check if currently in enlistment root with src/ workdir */
  46         len = path.len;
  47         strbuf_addstr(&path, "/src");
  48         if (is_nonbare_repository_dir(&path)) {
  49                 enlistment_is_repo_parent = 1;
  50                 if (chdir(path.buf) < 0)
  51                         die_errno(_("could not switch to '%s'"), path.buf);
  52         }
  53         strbuf_setlen(&path, len);
  54
  55         setup_git_directory();
  56
  57         if (!the_repository->worktree)
  58                 die(_("Scalar enlistments require a worktree"));
  59
  60         if (enlistment_root) {
  61                 if (enlistment_is_repo_parent)
  62                         strbuf_addbuf(enlistment_root, &path);
  63                 else
  64                         strbuf_addstr(enlistment_root, the_repository->worktree);
  65         }
  66
  67         strbuf_release(&path);
  68 }
  69
  70 static int run_git(const char *arg, ...)
  71 {
  72         struct child_process cmd = CHILD_PROCESS_INIT;
  73         va_list args;
  74         const char *p;
  75
  76         va_start(args, arg);
  77         strvec_push(&cmd.args, arg);
  78         while ((p = va_arg(args, const char *)))
  79                 strvec_push(&cmd.args, p);
  80         va_end(args);
  81
  82         cmd.git_cmd = 1;
  83         return run_command(&cmd);
  84 }
  85
  86 struct scalar_config {
  87         const char *key;
  88         const char *value;
  89         int overwrite_on_reconfigure;
  90 };
  91
  92 static int set_scalar_config(const struct scalar_config *config, int reconfigure)
  93 {
  94         char *value = NULL;
  95         int res;
  96
  97         if ((reconfigure && config->overwrite_on_reconfigure) ||
  98             git_config_get_string(config->key, &value)) {
  99                 trace2_data_string("scalar", the_repository, config->key, "created");
 100                 res = git_config_set_gently(config->key, config->value);
 101         } else {
 102                 trace2_data_string("scalar", the_repository, config->key, "exists");
 103                 res = 0;
 104         }
 105
 106         free(value);
 107         return res;
 108 }
 109
 110 static int have_fsmonitor_support(void)
 111 {
 112         return fsmonitor_ipc__is_supported() &&
 113                fsm_settings__get_reason(the_repository) == FSMONITOR_REASON_OK;
 114 }
 115
 116 static int set_recommended_config(int reconfigure)
 117 {
 118         struct scalar_config config[] = {
 119                 /* Required */
 120                 { "am.keepCR", "true", 1 },
 121                 { "core.FSCache", "true", 1 },
 122                 { "core.multiPackIndex", "true", 1 },
 123                 { "core.preloadIndex", "true", 1 },
 124 #ifndef WIN32
 125                 { "core.untrackedCache", "true", 1 },
 126 #else
 127                 /*
 128                  * Unfortunately, Scalar's Functional Tests demonstrated
 129                  * that the untracked cache feature is unreliable on Windows
 130                  * (which is a bummer because that platform would benefit the
 131                  * most from it). For some reason, freshly created files seem
 132                  * not to update the directory's `lastModified` time
 133                  * immediately, but the untracked cache would need to rely on
 134                  * that.
 135                  *
 136                  * Therefore, with a sad heart, we disable this very useful
 137                  * feature on Windows.
 138                  */
 139                 { "core.untrackedCache", "false", 1 },
 140 #endif
 141                 { "core.logAllRefUpdates", "true", 1 },
 142                 { "credential.https://dev.azure.com.useHttpPath", "true", 1 },
 143                 { "credential.validate", "false", 1 }, /* GCM4W-only */
 144                 { "gc.auto", "0", 1 },
 145                 { "gui.GCWarning", "false", 1 },
 146                 { "index.threads", "true", 1 },
 147                 { "index.version", "4", 1 },
 148                 { "merge.stat", "false", 1 },
 149                 { "merge.renames", "true", 1 },
 150                 { "pack.useBitmaps", "false", 1 },
 151                 { "pack.useSparse", "true", 1 },
 152                 { "receive.autoGC", "false", 1 },
 153                 { "feature.manyFiles", "false", 1 },
 154                 { "feature.experimental", "false", 1 },
 155                 { "fetch.unpackLimit", "1", 1 },
 156                 { "fetch.writeCommitGraph", "false", 1 },
 157 #ifdef WIN32
 158                 { "http.sslBackend", "schannel", 1 },
 159 #endif
 160                 /* Optional */
 161                 { "status.aheadBehind", "false" },
 162                 { "commitGraph.generationVersion", "1" },
 163                 { "core.autoCRLF", "false" },
 164                 { "core.safeCRLF", "false" },
 165                 { "fetch.showForcedUpdates", "false" },
 166                 { NULL, NULL },
 167         };
 168         int i;
 169         char *value;
 170
 171         for (i = 0; config[i].key; i++) {
 172                 if (set_scalar_config(config + i, reconfigure))
 173                         return error(_("could not configure %s=%s"),
 174                                      config[i].key, config[i].value);
 175         }
 176
 177         if (have_fsmonitor_support()) {
 178                 struct scalar_config fsmonitor = { "core.fsmonitor", "true" };
 179                 if (set_scalar_config(&fsmonitor, reconfigure))
 180                         return error(_("could not configure %s=%s"),
 181                                      fsmonitor.key, fsmonitor.value);
 182         }
 183
 184         /*
 185          * The `log.excludeDecoration` setting is special because it allows
 186          * for multiple values.
 187          */
 188         if (git_config_get_string("log.excludeDecoration", &value)) {
 189                 trace2_data_string("scalar", the_repository,
 190                                    "log.excludeDecoration", "created");
 191                 if (git_config_set_multivar_gently("log.excludeDecoration",
 192                                                    "refs/prefetch/*",
 193                                                    CONFIG_REGEX_NONE, 0))
 194                         return error(_("could not configure "
 195                                        "log.excludeDecoration"));
 196         } else {
 197                 trace2_data_string("scalar", the_repository,
 198                                    "log.excludeDecoration", "exists");
 199                 free(value);
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int toggle_maintenance(int enable)
 206 {
 207         return run_git("maintenance",
 208                        enable ? "start" : "unregister",
 209                        enable ? NULL : "--force",
 210                        NULL);
 211 }
 212
 213 static int add_or_remove_enlistment(int add)
 214 {
 215         int res;
 216
 217         if (!the_repository->worktree)
 218                 die(_("Scalar enlistments require a worktree"));
 219
 220         res = run_git("config", "--global", "--get", "--fixed-value",
 221                       "scalar.repo", the_repository->worktree, NULL);
 222
 223         /*
 224          * If we want to add and the setting is already there, then do nothing.
 225          * If we want to remove and the setting is not there, then do nothing.
 226          */
 227         if ((add && !res) || (!add && res))
 228                 return 0;
 229
 230         return run_git("config", "--global", add ? "--add" : "--unset",
 231                        add ? "--no-fixed-value" : "--fixed-value",
 232                        "scalar.repo", the_repository->worktree, NULL);
 233 }
 234
 235 static int start_fsmonitor_daemon(void)
 236 {
 237         assert(have_fsmonitor_support());
 238
 239         if (fsmonitor_ipc__get_state() != IPC_STATE__LISTENING)
 240                 return run_git("fsmonitor--daemon", "start", NULL);
 241
 242         return 0;
 243 }
 244
 245 static int stop_fsmonitor_daemon(void)
 246 {
 247         assert(have_fsmonitor_support());
 248
 249         if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
 250                 return run_git("fsmonitor--daemon", "stop", NULL);
 251
 252         return 0;
 253 }
 254
 255 static int register_dir(void)
 256 {
 257         if (add_or_remove_enlistment(1))
 258                 return error(_("could not add enlistment"));
 259
 260         if (set_recommended_config(0))
 261                 return error(_("could not set recommended config"));
 262
 263         if (toggle_maintenance(1))
 264                 return error(_("could not turn on maintenance"));
 265
 266         if (have_fsmonitor_support() && start_fsmonitor_daemon()) {
 267                 return error(_("could not start the FSMonitor daemon"));
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int unregister_dir(void)
 274 {
 275         int res = 0;
 276
 277         if (toggle_maintenance(0))
 278                 res = error(_("could not turn off maintenance"));
 279
 280         if (add_or_remove_enlistment(0))
 281                 res = error(_("could not remove enlistment"));
 282
 283         return res;
 284 }
 285
 286 /* printf-style interface, expects `<key>=<value>` argument */
 287 static int set_config(const char *fmt, ...)
 288 {
 289         struct strbuf buf = STRBUF_INIT;
 290         char *value;
 291         int res;
 292         va_list args;
 293
 294         va_start(args, fmt);
 295         strbuf_vaddf(&buf, fmt, args);
 296         va_end(args);
 297
 298         value = strchr(buf.buf, '=');
 299         if (value)
 300                 *(value++) = '\0';
 301         res = git_config_set_gently(buf.buf, value);
 302         strbuf_release(&buf);
 303
 304         return res;
 305 }
 306
 307 static char *remote_default_branch(const char *url)
 308 {
 309         struct child_process cp = CHILD_PROCESS_INIT;
 310         struct strbuf out = STRBUF_INIT;
 311
 312         cp.git_cmd = 1;
 313         strvec_pushl(&cp.args, "ls-remote", "--symref", url, "HEAD", NULL);
 314         if (!pipe_command(&cp, NULL, 0, &out, 0, NULL, 0)) {
 315                 const char *line = out.buf;
 316
 317                 while (*line) {
 318                         const char *eol = strchrnul(line, '\n'), *p;
 319                         size_t len = eol - line;
 320                         char *branch;
 321
 322                         if (!skip_prefix(line, "ref: ", &p) ||
 323                             !strip_suffix_mem(line, &len, "\tHEAD")) {
 324                                 line = eol + (*eol == '\n');
 325                                 continue;
 326                         }
 327
 328                         eol = line + len;
 329                         if (skip_prefix(p, "refs/heads/", &p)) {
 330                                 branch = xstrndup(p, eol - p);
 331                                 strbuf_release(&out);
 332                                 return branch;
 333                         }
 334
 335                         error(_("remote HEAD is not a branch: '%.*s'"),
 336                               (int)(eol - p), p);
 337                         strbuf_release(&out);
 338                         return NULL;
 339                 }
 340         }
 341         warning(_("failed to get default branch name from remote; "
 342                   "using local default"));
 343         strbuf_reset(&out);
 344
 345         child_process_init(&cp);
 346         cp.git_cmd = 1;
 347         strvec_pushl(&cp.args, "symbolic-ref", "--short", "HEAD", NULL);
 348         if (!pipe_command(&cp, NULL, 0, &out, 0, NULL, 0)) {
 349                 strbuf_trim(&out);
 350                 return strbuf_detach(&out, NULL);
 351         }
 352
 353         strbuf_release(&out);
 354         error(_("failed to get default branch name"));
 355         return NULL;
 356 }
 357
 358 static int delete_enlistment(struct strbuf *enlistment)
 359 {
 360 #ifdef WIN32
 361         struct strbuf parent = STRBUF_INIT;
 362         size_t offset;
 363         char *path_sep;
 364 #endif
 365
 366         if (unregister_dir())
 367                 return error(_("failed to unregister repository"));
 368
 369 #ifdef WIN32
 370         /*
 371          * Change the current directory to one outside of the enlistment so
 372          * that we may delete everything underneath it.
 373          */
 374         offset = offset_1st_component(enlistment->buf);
 375         path_sep = find_last_dir_sep(enlistment->buf + offset);
 376         strbuf_add(&parent, enlistment->buf,
 377                    path_sep ? path_sep - enlistment->buf : offset);
 378         if (chdir(parent.buf) < 0) {
 379                 int res = error_errno(_("could not switch to '%s'"), parent.buf);
 380                 strbuf_release(&parent);
 381                 return res;
 382         }
 383         strbuf_release(&parent);
 384 #endif
 385
 386         if (have_fsmonitor_support() && stop_fsmonitor_daemon())
 387                 return error(_("failed to stop the FSMonitor daemon"));
 388
 389         if (remove_dir_recursively(enlistment, 0))
 390                 return error(_("failed to delete enlistment directory"));
 391
 392         return 0;
 393 }
 394
 395 /*
 396  * Dummy implementation; Using `get_version_info()` would cause a link error
 397  * without this.
 398  */
 399 void load_builtin_commands(const char *prefix, struct cmdnames *cmds)
 400 {
 401         die("not implemented");
 402 }
 403
 404 static int cmd_clone(int argc, const char **argv)
 405 {
 406         const char *branch = NULL;
 407         int full_clone = 0, single_branch = 0;
 408         struct option clone_options[] = {
 409                 OPT_STRING('b', "branch", &branch, N_("<branch>"),
 410                            N_("branch to checkout after clone")),
 411                 OPT_BOOL(0, "full-clone", &full_clone,
 412                          N_("when cloning, create full working directory")),
 413                 OPT_BOOL(0, "single-branch", &single_branch,
 414                          N_("only download metadata for the branch that will "
 415                             "be checked out")),
 416                 OPT_END(),
 417         };
 418         const char * const clone_usage[] = {
 419                 N_("scalar clone [<options>] [--] <repo> [<dir>]"),
 420                 NULL
 421         };
 422         const char *url;
 423         char *enlistment = NULL, *dir = NULL;
 424         struct strbuf buf = STRBUF_INIT;
 425         int res;
 426
 427         argc = parse_options(argc, argv, NULL, clone_options, clone_usage, 0);
 428
 429         if (argc == 2) {
 430                 url = argv[0];
 431                 enlistment = xstrdup(argv[1]);
 432         } else if (argc == 1) {
 433                 url = argv[0];
 434
 435                 strbuf_addstr(&buf, url);
 436                 /* Strip trailing slashes, if any */
 437                 while (buf.len > 0 && is_dir_sep(buf.buf[buf.len - 1]))
 438                         strbuf_setlen(&buf, buf.len - 1);
 439                 /* Strip suffix `.git`, if any */
 440                 strbuf_strip_suffix(&buf, ".git");
 441
 442                 enlistment = find_last_dir_sep(buf.buf);
 443                 if (!enlistment) {
 444                         die(_("cannot deduce worktree name from '%s'"), url);
 445                 }
 446                 enlistment = xstrdup(enlistment + 1);
 447         } else {
 448                 usage_msg_opt(_("You must specify a repository to clone."),
 449                               clone_usage, clone_options);
 450         }
 451
 452         if (is_directory(enlistment))
 453                 die(_("directory '%s' exists already"), enlistment);
 454
 455         dir = xstrfmt("%s/src", enlistment);
 456
 457         strbuf_reset(&buf);
 458         if (branch)
 459                 strbuf_addf(&buf, "init.defaultBranch=%s", branch);
 460         else {
 461                 char *b = repo_default_branch_name(the_repository, 1);
 462                 strbuf_addf(&buf, "init.defaultBranch=%s", b);
 463                 free(b);
 464         }
 465
 466         if ((res = run_git("-c", buf.buf, "init", "--", dir, NULL)))
 467                 goto cleanup;
 468
 469         if (chdir(dir) < 0) {
 470                 res = error_errno(_("could not switch to '%s'"), dir);
 471                 goto cleanup;
 472         }
 473
 474         setup_git_directory();
 475
 476         /* common-main already logs `argv` */
 477         trace2_def_repo(the_repository);
 478
 479         if (!branch && !(branch = remote_default_branch(url))) {
 480                 res = error(_("failed to get default branch for '%s'"), url);
 481                 goto cleanup;
 482         }
 483
 484         if (set_config("remote.origin.url=%s", url) ||
 485             set_config("remote.origin.fetch="
 486                        "+refs/heads/%s:refs/remotes/origin/%s",
 487                        single_branch ? branch : "*",
 488                        single_branch ? branch : "*") ||
 489             set_config("remote.origin.promisor=true") ||
 490             set_config("remote.origin.partialCloneFilter=blob:none")) {
 491                 res = error(_("could not configure remote in '%s'"), dir);
 492                 goto cleanup;
 493         }
 494
 495         if (!full_clone &&
 496             (res = run_git("sparse-checkout", "init", "--cone", NULL)))
 497                 goto cleanup;
 498
 499         if (set_recommended_config(0))
 500                 return error(_("could not configure '%s'"), dir);
 501
 502         if ((res = run_git("fetch", "--quiet", "origin", NULL))) {
 503                 warning(_("partial clone failed; attempting full clone"));
 504
 505                 if (set_config("remote.origin.promisor") ||
 506                     set_config("remote.origin.partialCloneFilter")) {
 507                         res = error(_("could not configure for full clone"));
 508                         goto cleanup;
 509                 }
 510
 511                 if ((res = run_git("fetch", "--quiet", "origin", NULL)))
 512                         goto cleanup;
 513         }
 514
 515         if ((res = set_config("branch.%s.remote=origin", branch)))
 516                 goto cleanup;
 517         if ((res = set_config("branch.%s.merge=refs/heads/%s",
 518                               branch, branch)))
 519                 goto cleanup;
 520
 521         strbuf_reset(&buf);
 522         strbuf_addf(&buf, "origin/%s", branch);
 523         res = run_git("checkout", "-f", "-t", buf.buf, NULL);
 524         if (res)
 525                 goto cleanup;
 526
 527         res = register_dir();
 528
 529 cleanup:
 530         free(enlistment);
 531         free(dir);
 532         strbuf_release(&buf);
 533         return res;
 534 }
 535
 536 static int cmd_diagnose(int argc, const char **argv)
 537 {
 538         struct option options[] = {
 539                 OPT_END(),
 540         };
 541         const char * const usage[] = {
 542                 N_("scalar diagnose [<enlistment>]"),
 543                 NULL
 544         };
 545         struct strbuf diagnostics_root = STRBUF_INIT;
 546         int res = 0;
 547
 548         argc = parse_options(argc, argv, NULL, options,
 549                              usage, 0);
 550
 551         setup_enlistment_directory(argc, argv, usage, options, &diagnostics_root);
 552         strbuf_addstr(&diagnostics_root, "/.scalarDiagnostics");
 553
 554         res = run_git("diagnose", "--mode=all", "-s", "%Y%m%d_%H%M%S",
 555                       "-o", diagnostics_root.buf, NULL);
 556
 557         strbuf_release(&diagnostics_root);
 558         return res;
 559 }
 560
 561 static int cmd_list(int argc, const char **argv)
 562 {
 563         if (argc != 1)
 564                 die(_("`scalar list` does not take arguments"));
 565
 566         if (run_git("config", "--global", "--get-all", "scalar.repo", NULL) < 0)
 567                 return -1;
 568         return 0;
 569 }
 570
 571 static int cmd_register(int argc, const char **argv)
 572 {
 573         struct option options[] = {
 574                 OPT_END(),
 575         };
 576         const char * const usage[] = {
 577                 N_("scalar register [<enlistment>]"),
 578                 NULL
 579         };
 580
 581         argc = parse_options(argc, argv, NULL, options,
 582                              usage, 0);
 583
 584         setup_enlistment_directory(argc, argv, usage, options, NULL);
 585
 586         return register_dir();
 587 }
 588
 589 static int get_scalar_repos(const char *key, const char *value, void *data)
 590 {
 591         struct string_list *list = data;
 592
 593         if (!strcmp(key, "scalar.repo"))
 594                 string_list_append(list, value);
 595
 596         return 0;
 597 }
 598
 599 static int remove_deleted_enlistment(struct strbuf *path)
 600 {
 601         int res = 0;
 602         strbuf_realpath_forgiving(path, path->buf, 1);
 603
 604         if (run_git("config", "--global",
 605                     "--unset", "--fixed-value",
 606                     "scalar.repo", path->buf, NULL) < 0)
 607                 res = -1;
 608
 609         if (run_git("config", "--global",
 610                     "--unset", "--fixed-value",
 611                     "maintenance.repo", path->buf, NULL) < 0)
 612                 res = -1;
 613
 614         return res;
 615 }
 616
 617 static int cmd_reconfigure(int argc, const char **argv)
 618 {
 619         int all = 0;
 620         struct option options[] = {
 621                 OPT_BOOL('a', "all", &all,
 622                          N_("reconfigure all registered enlistments")),
 623                 OPT_END(),
 624         };
 625         const char * const usage[] = {
 626                 N_("scalar reconfigure [--all | <enlistment>]"),
 627                 NULL
 628         };
 629         struct string_list scalar_repos = STRING_LIST_INIT_DUP;
 630         int i, res = 0;
 631         struct repository r = { NULL };
 632         struct strbuf commondir = STRBUF_INIT, gitdir = STRBUF_INIT;
 633
 634         argc = parse_options(argc, argv, NULL, options,
 635                              usage, 0);
 636
 637         if (!all) {
 638                 setup_enlistment_directory(argc, argv, usage, options, NULL);
 639
 640                 return set_recommended_config(1);
 641         }
 642
 643         if (argc > 0)
 644                 usage_msg_opt(_("--all or <enlistment>, but not both"),
 645                               usage, options);
 646
 647         git_config(get_scalar_repos, &scalar_repos);
 648
 649         for (i = 0; i < scalar_repos.nr; i++) {
 650                 const char *dir = scalar_repos.items[i].string;
 651
 652                 strbuf_reset(&commondir);
 653                 strbuf_reset(&gitdir);
 654
 655                 if (chdir(dir) < 0) {
 656                         struct strbuf buf = STRBUF_INIT;
 657
 658                         if (errno != ENOENT) {
 659                                 warning_errno(_("could not switch to '%s'"), dir);
 660                                 res = -1;
 661                                 continue;
 662                         }
 663
 664                         strbuf_addstr(&buf, dir);
 665                         if (remove_deleted_enlistment(&buf))
 666                                 res = error(_("could not remove stale "
 667                                               "scalar.repo '%s'"), dir);
 668                         else
 669                                 warning(_("removing stale scalar.repo '%s'"),
 670                                         dir);
 671                         strbuf_release(&buf);
 672                 } else if (discover_git_directory(&commondir, &gitdir) < 0) {
 673                         warning_errno(_("git repository gone in '%s'"), dir);
 674                         res = -1;
 675                 } else {
 676                         git_config_clear();
 677
 678                         the_repository = &r;
 679                         r.commondir = commondir.buf;
 680                         r.gitdir = gitdir.buf;
 681
 682                         if (set_recommended_config(1) < 0)
 683                                 res = -1;
 684                 }
 685         }
 686
 687         string_list_clear(&scalar_repos, 1);
 688         strbuf_release(&commondir);
 689         strbuf_release(&gitdir);
 690
 691         return res;
 692 }
 693
 694 static int cmd_run(int argc, const char **argv)
 695 {
 696         struct option options[] = {
 697                 OPT_END(),
 698         };
 699         struct {
 700                 const char *arg, *task;
 701         } tasks[] = {
 702                 { "config", NULL },
 703                 { "commit-graph", "commit-graph" },
 704                 { "fetch", "prefetch" },
 705                 { "loose-objects", "loose-objects" },
 706                 { "pack-files", "incremental-repack" },
 707                 { NULL, NULL }
 708         };
 709         struct strbuf buf = STRBUF_INIT;
 710         const char *usagestr[] = { NULL, NULL };
 711         int i;
 712
 713         strbuf_addstr(&buf, N_("scalar run <task> [<enlistment>]\nTasks:\n"));
 714         for (i = 0; tasks[i].arg; i++)
 715                 strbuf_addf(&buf, "\t%s\n", tasks[i].arg);
 716         usagestr[0] = buf.buf;
 717
 718         argc = parse_options(argc, argv, NULL, options,
 719                              usagestr, 0);
 720
 721         if (!argc)
 722                 usage_with_options(usagestr, options);
 723
 724         if (!strcmp("all", argv[0])) {
 725                 i = -1;
 726         } else {
 727                 for (i = 0; tasks[i].arg && strcmp(tasks[i].arg, argv[0]); i++)
 728                         ; /* keep looking for the task */
 729
 730                 if (i > 0 && !tasks[i].arg) {
 731                         error(_("no such task: '%s'"), argv[0]);
 732                         usage_with_options(usagestr, options);
 733                 }
 734         }
 735
 736         argc--;
 737         argv++;
 738         setup_enlistment_directory(argc, argv, usagestr, options, NULL);
 739         strbuf_release(&buf);
 740
 741         if (i == 0)
 742                 return register_dir();
 743
 744         if (i > 0)
 745                 return run_git("maintenance", "run",
 746                                "--task", tasks[i].task, NULL);
 747
 748         if (register_dir())
 749                 return -1;
 750         for (i = 1; tasks[i].arg; i++)
 751                 if (run_git("maintenance", "run",
 752                             "--task", tasks[i].task, NULL))
 753                         return -1;
 754         return 0;
 755 }
 756
 757 static int cmd_unregister(int argc, const char **argv)
 758 {
 759         struct option options[] = {
 760                 OPT_END(),
 761         };
 762         const char * const usage[] = {
 763                 N_("scalar unregister [<enlistment>]"),
 764                 NULL
 765         };
 766
 767         argc = parse_options(argc, argv, NULL, options,
 768                              usage, 0);
 769
 770         /*
 771          * Be forgiving when the enlistment or worktree does not even exist any
 772          * longer; This can be the case if a user deleted the worktree by
 773          * mistake and _still_ wants to unregister the thing.
 774          */
 775         if (argc == 1) {
 776                 struct strbuf src_path = STRBUF_INIT, workdir_path = STRBUF_INIT;
 777
 778                 strbuf_addf(&src_path, "%s/src/.git", argv[0]);
 779                 strbuf_addf(&workdir_path, "%s/.git", argv[0]);
 780                 if (!is_directory(src_path.buf) && !is_directory(workdir_path.buf)) {
 781                         /* remove possible matching registrations */
 782                         int res = -1;
 783
 784                         strbuf_strip_suffix(&src_path, "/.git");
 785                         res = remove_deleted_enlistment(&src_path) && res;
 786
 787                         strbuf_strip_suffix(&workdir_path, "/.git");
 788                         res = remove_deleted_enlistment(&workdir_path) && res;
 789
 790                         strbuf_release(&src_path);
 791                         strbuf_release(&workdir_path);
 792                         return res;
 793                 }
 794                 strbuf_release(&src_path);
 795                 strbuf_release(&workdir_path);
 796         }
 797
 798         setup_enlistment_directory(argc, argv, usage, options, NULL);
 799
 800         return unregister_dir();
 801 }
 802
 803 static int cmd_delete(int argc, const char **argv)
 804 {
 805         char *cwd = xgetcwd();
 806         struct option options[] = {
 807                 OPT_END(),
 808         };
 809         const char * const usage[] = {
 810                 N_("scalar delete <enlistment>"),
 811                 NULL
 812         };
 813         struct strbuf enlistment = STRBUF_INIT;
 814         int res = 0;
 815
 816         argc = parse_options(argc, argv, NULL, options,
 817                              usage, 0);
 818
 819         if (argc != 1)
 820                 usage_with_options(usage, options);
 821
 822         setup_enlistment_directory(argc, argv, usage, options, &enlistment);
 823
 824         if (dir_inside_of(cwd, enlistment.buf) >= 0)
 825                 res = error(_("refusing to delete current working directory"));
 826         else {
 827                 close_object_store(the_repository->objects);
 828                 res = delete_enlistment(&enlistment);
 829         }
 830         strbuf_release(&enlistment);
 831         free(cwd);
 832
 833         return res;
 834 }
 835
 836 static int cmd_help(int argc, const char **argv)
 837 {
 838         struct option options[] = {
 839                 OPT_END(),
 840         };
 841         const char * const usage[] = {
 842                 "scalar help",
 843                 NULL
 844         };
 845
 846         argc = parse_options(argc, argv, NULL, options,
 847                              usage, 0);
 848
 849         if (argc != 0)
 850                 usage_with_options(usage, options);
 851
 852         return run_git("help", "scalar", NULL);
 853 }
 854
 855 static int cmd_version(int argc, const char **argv)
 856 {
 857         int verbose = 0, build_options = 0;
 858         struct option options[] = {
 859                 OPT__VERBOSE(&verbose, N_("include Git version")),
 860                 OPT_BOOL(0, "build-options", &build_options,
 861                          N_("include Git's build options")),
 862                 OPT_END(),
 863         };
 864         const char * const usage[] = {
 865                 N_("scalar verbose [-v | --verbose] [--build-options]"),
 866                 NULL
 867         };
 868         struct strbuf buf = STRBUF_INIT;
 869
 870         argc = parse_options(argc, argv, NULL, options,
 871                              usage, 0);
 872
 873         if (argc != 0)
 874                 usage_with_options(usage, options);
 875
 876         get_version_info(&buf, build_options);
 877         fprintf(stderr, "%s\n", buf.buf);
 878         strbuf_release(&buf);
 879
 880         return 0;
 881 }
 882
 883 static struct {
 884         const char *name;
 885         int (*fn)(int, const char **);
 886 } builtins[] = {
 887         { "clone", cmd_clone },
 888         { "list", cmd_list },
 889         { "register", cmd_register },
 890         { "unregister", cmd_unregister },
 891         { "run", cmd_run },
 892         { "reconfigure", cmd_reconfigure },
 893         { "delete", cmd_delete },
 894         { "help", cmd_help },
 895         { "version", cmd_version },
 896         { "diagnose", cmd_diagnose },
 897         { NULL, NULL},
 898 };
 899
 900 int cmd_main(int argc, const char **argv)
 901 {
 902         struct strbuf scalar_usage = STRBUF_INIT;
 903         int i;
 904
 905         while (argc > 1 && *argv[1] == '-') {
 906                 if (!strcmp(argv[1], "-C")) {
 907                         if (argc < 3)
 908                                 die(_("-C requires a <directory>"));
 909                         if (chdir(argv[2]) < 0)
 910                                 die_errno(_("could not change to '%s'"),
 911                                           argv[2]);
 912                         argc -= 2;
 913                         argv += 2;
 914                 } else if (!strcmp(argv[1], "-c")) {
 915                         if (argc < 3)
 916                                 die(_("-c requires a <key>=<value> argument"));
 917                         git_config_push_parameter(argv[2]);
 918                         argc -= 2;
 919                         argv += 2;
 920                 } else
 921                         break;
 922         }
 923
 924         if (argc > 1) {
 925                 argv++;
 926                 argc--;
 927
 928                 for (i = 0; builtins[i].name; i++)
 929                         if (!strcmp(builtins[i].name, argv[0]))
 930                                 return !!builtins[i].fn(argc, argv);
 931         }
 932
 933         strbuf_addstr(&scalar_usage,
 934                       N_("scalar [-C <directory>] [-c <key>=<value>] "
 935                          "<command> [<options>]\n\nCommands:\n"));
 936         for (i = 0; builtins[i].name; i++)
 937                 strbuf_addf(&scalar_usage, "\t%s\n", builtins[i].name);
 938
 939         usage(scalar_usage.buf);
 940 }