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