scalar.c

   1 /*
   2  * The Scalar command-line interface.
   3  */
   4
   5 #include "git-compat-util.h"
   6 #include "abspath.h"
   7 #include "gettext.h"
   8 #include "parse-options.h"
   9 #include "config.h"
  10 #include "run-command.h"
  11 #include "simple-ipc.h"
  12 #include "fsmonitor-ipc.h"
  13 #include "fsmonitor-settings.h"
  14 #include "refs.h"
  15 #include "dir.h"
  16 #include "packfile.h"
  17 #include "help.h"
  18 #include "setup.h"
  19 #include "trace2.h"
  20
  21 static void setup_enlistment_directory(int argc, const char **argv,
  22                                        const char * const *usagestr,
  23                                        const struct option *options,
  24                                        struct strbuf *enlistment_root)
  25 {
  26         struct strbuf path = STRBUF_INIT;
  27         int enlistment_is_repo_parent = 0;
  28         size_t len;
  29
  30         if (startup_info->have_repository)
  31                 BUG("gitdir already set up?!?");
  32
  33         if (argc > 1)
  34                 usage_with_options(usagestr, options);
  35
  36         /* find the worktree, determine its corresponding root */
  37         if (argc == 1) {
  38                 strbuf_add_absolute_path(&path, argv[0]);
  39                 if (!is_directory(path.buf))
  40                         die(_("'%s' does not exist"), path.buf);
  41                 if (chdir(path.buf) < 0)
  42                         die_errno(_("could not switch to '%s'"), path.buf);
  43         } else if (strbuf_getcwd(&path) < 0)
  44                 die(_("need a working directory"));
  45
  46         strbuf_trim_trailing_dir_sep(&path);
  47
  48         /* check if currently in enlistment root with src/ workdir */
  49         len = path.len;
  50         strbuf_addstr(&path, "/src");
  51         if (is_nonbare_repository_dir(&path)) {
  52                 enlistment_is_repo_parent = 1;
  53                 if (chdir(path.buf) < 0)
  54                         die_errno(_("could not switch to '%s'"), path.buf);
  55         }
  56         strbuf_setlen(&path, len);
  57
  58         setup_git_directory();
  59
  60         if (!the_repository->worktree)
  61                 die(_("Scalar enlistments require a worktree"));
  62
  63         if (enlistment_root) {
  64                 if (enlistment_is_repo_parent)
  65                         strbuf_addbuf(enlistment_root, &path);
  66                 else
  67                         strbuf_addstr(enlistment_root, the_repository->worktree);
  68         }
  69
  70         strbuf_release(&path);
  71 }
  72
  73 static int run_git(const char *arg, ...)
  74 {
  75         struct child_process cmd = CHILD_PROCESS_INIT;
  76         va_list args;
  77         const char *p;
  78
  79         va_start(args, arg);
  80         strvec_push(&cmd.args, arg);
  81         while ((p = va_arg(args, const char *)))
  82                 strvec_push(&cmd.args, p);
  83         va_end(args);
  84
  85         cmd.git_cmd = 1;
  86         return run_command(&cmd);
  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.skipHash", "false", 1 },
 150                 { "index.threads", "true", 1 },
 151                 { "index.version", "4", 1 },
 152                 { "merge.stat", "false", 1 },
 153                 { "merge.renames", "true", 1 },
 154                 { "pack.useBitmaps", "false", 1 },
 155                 { "pack.useSparse", "true", 1 },
 156                 { "receive.autoGC", "false", 1 },
 157                 { "feature.manyFiles", "false", 1 },
 158                 { "feature.experimental", "false", 1 },
 159                 { "fetch.unpackLimit", "1", 1 },
 160                 { "fetch.writeCommitGraph", "false", 1 },
 161 #ifdef WIN32
 162                 { "http.sslBackend", "schannel", 1 },
 163 #endif
 164                 /* Optional */
 165                 { "status.aheadBehind", "false" },
 166                 { "commitGraph.generationVersion", "1" },
 167                 { "core.autoCRLF", "false" },
 168                 { "core.safeCRLF", "false" },
 169                 { "fetch.showForcedUpdates", "false" },
 170                 { NULL, NULL },
 171         };
 172         int i;
 173         char *value;
 174
 175         for (i = 0; config[i].key; i++) {
 176                 if (set_scalar_config(config + i, reconfigure))
 177                         return error(_("could not configure %s=%s"),
 178                                      config[i].key, config[i].value);
 179         }
 180
 181         if (have_fsmonitor_support()) {
 182                 struct scalar_config fsmonitor = { "core.fsmonitor", "true" };
 183                 if (set_scalar_config(&fsmonitor, reconfigure))
 184                         return error(_("could not configure %s=%s"),
 185                                      fsmonitor.key, fsmonitor.value);
 186         }
 187
 188         /*
 189          * The `log.excludeDecoration` setting is special because it allows
 190          * for multiple values.
 191          */
 192         if (git_config_get_string("log.excludeDecoration", &value)) {
 193                 trace2_data_string("scalar", the_repository,
 194                                    "log.excludeDecoration", "created");
 195                 if (git_config_set_multivar_gently("log.excludeDecoration",
 196                                                    "refs/prefetch/*",
 197                                                    CONFIG_REGEX_NONE, 0))
 198                         return error(_("could not configure "
 199                                        "log.excludeDecoration"));
 200         } else {
 201                 trace2_data_string("scalar", the_repository,
 202                                    "log.excludeDecoration", "exists");
 203                 free(value);
 204         }
 205
 206         return 0;
 207 }
 208
 209 static int toggle_maintenance(int enable)
 210 {
 211         return run_git("maintenance",
 212                        enable ? "start" : "unregister",
 213                        enable ? NULL : "--force",
 214                        NULL);
 215 }
 216
 217 static int add_or_remove_enlistment(int add)
 218 {
 219         int res;
 220
 221         if (!the_repository->worktree)
 222                 die(_("Scalar enlistments require a worktree"));
 223
 224         res = run_git("config", "--global", "--get", "--fixed-value",
 225                       "scalar.repo", the_repository->worktree, NULL);
 226
 227         /*
 228          * If we want to add and the setting is already there, then do nothing.
 229          * If we want to remove and the setting is not there, then do nothing.
 230          */
 231         if ((add && !res) || (!add && res))
 232                 return 0;
 233
 234         return run_git("config", "--global", add ? "--add" : "--unset",
 235                        add ? "--no-fixed-value" : "--fixed-value",
 236                        "scalar.repo", the_repository->worktree, NULL);
 237 }
 238
 239 static int start_fsmonitor_daemon(void)
 240 {
 241         assert(have_fsmonitor_support());
 242
 243         if (fsmonitor_ipc__get_state() != IPC_STATE__LISTENING)
 244                 return run_git("fsmonitor--daemon", "start", NULL);
 245
 246         return 0;
 247 }
 248
 249 static int stop_fsmonitor_daemon(void)
 250 {
 251         assert(have_fsmonitor_support());
 252
 253         if (fsmonitor_ipc__get_state() == IPC_STATE__LISTENING)
 254                 return run_git("fsmonitor--daemon", "stop", NULL);
 255
 256         return 0;
 257 }
 258
 259 static int register_dir(void)
 260 {
 261         if (add_or_remove_enlistment(1))
 262                 return error(_("could not add enlistment"));
 263
 264         if (set_recommended_config(0))
 265                 return error(_("could not set recommended config"));
 266
 267         if (toggle_maintenance(1))
 268                 warning(_("could not turn on maintenance"));
 269
 270         if (have_fsmonitor_support() && start_fsmonitor_daemon()) {
 271                 return error(_("could not start the FSMonitor daemon"));
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int unregister_dir(void)
 278 {
 279         int res = 0;
 280
 281         if (toggle_maintenance(0))
 282                 res = error(_("could not turn off maintenance"));
 283
 284         if (add_or_remove_enlistment(0))
 285                 res = error(_("could not remove enlistment"));
 286
 287         return res;
 288 }
 289
 290 /* printf-style interface, expects `<key>=<value>` argument */
 291 static int set_config(const char *fmt, ...)
 292 {
 293         struct strbuf buf = STRBUF_INIT;
 294         char *value;
 295         int res;
 296         va_list args;
 297
 298         va_start(args, fmt);
 299         strbuf_vaddf(&buf, fmt, args);
 300         va_end(args);
 301
 302         value = strchr(buf.buf, '=');
 303         if (value)
 304                 *(value++) = '\0';
 305         res = git_config_set_gently(buf.buf, value);
 306         strbuf_release(&buf);
 307
 308         return res;
 309 }
 310
 311 static char *remote_default_branch(const char *url)
 312 {
 313         struct child_process cp = CHILD_PROCESS_INIT;
 314         struct strbuf out = STRBUF_INIT;
 315
 316         cp.git_cmd = 1;
 317         strvec_pushl(&cp.args, "ls-remote", "--symref", url, "HEAD", NULL);
 318         if (!pipe_command(&cp, NULL, 0, &out, 0, NULL, 0)) {
 319                 const char *line = out.buf;
 320
 321                 while (*line) {
 322                         const char *eol = strchrnul(line, '\n'), *p;
 323                         size_t len = eol - line;
 324                         char *branch;
 325
 326                         if (!skip_prefix(line, "ref: ", &p) ||
 327                             !strip_suffix_mem(line, &len, "\tHEAD")) {
 328                                 line = eol + (*eol == '\n');
 329                                 continue;
 330                         }
 331
 332                         eol = line + len;
 333                         if (skip_prefix(p, "refs/heads/", &p)) {
 334                                 branch = xstrndup(p, eol - p);
 335                                 strbuf_release(&out);
 336                                 return branch;
 337                         }
 338
 339                         error(_("remote HEAD is not a branch: '%.*s'"),
 340                               (int)(eol - p), p);
 341                         strbuf_release(&out);
 342                         return NULL;
 343                 }
 344         }
 345         warning(_("failed to get default branch name from remote; "
 346                   "using local default"));
 347         strbuf_reset(&out);
 348
 349         child_process_init(&cp);
 350         cp.git_cmd = 1;
 351         strvec_pushl(&cp.args, "symbolic-ref", "--short", "HEAD", NULL);
 352         if (!pipe_command(&cp, NULL, 0, &out, 0, NULL, 0)) {
 353                 strbuf_trim(&out);
 354                 return strbuf_detach(&out, NULL);
 355         }
 356
 357         strbuf_release(&out);
 358         error(_("failed to get default branch name"));
 359         return NULL;
 360 }
 361
 362 static int delete_enlistment(struct strbuf *enlistment)
 363 {
 364 #ifdef WIN32
 365         struct strbuf parent = STRBUF_INIT;
 366         size_t offset;
 367         char *path_sep;
 368 #endif
 369
 370         if (unregister_dir())
 371                 return error(_("failed to unregister repository"));
 372
 373 #ifdef WIN32
 374         /*
 375          * Change the current directory to one outside of the enlistment so
 376          * that we may delete everything underneath it.
 377          */
 378         offset = offset_1st_component(enlistment->buf);
 379         path_sep = find_last_dir_sep(enlistment->buf + offset);
 380         strbuf_add(&parent, enlistment->buf,
 381                    path_sep ? path_sep - enlistment->buf : offset);
 382         if (chdir(parent.buf) < 0) {
 383                 int res = error_errno(_("could not switch to '%s'"), parent.buf);
 384                 strbuf_release(&parent);
 385                 return res;
 386         }
 387         strbuf_release(&parent);
 388 #endif
 389
 390         if (have_fsmonitor_support() && stop_fsmonitor_daemon())
 391                 return error(_("failed to stop the FSMonitor daemon"));
 392
 393         if (remove_dir_recursively(enlistment, 0))
 394                 return error(_("failed to delete enlistment directory"));
 395
 396         return 0;
 397 }
 398
 399 /*
 400  * Dummy implementation; Using `get_version_info()` would cause a link error
 401  * without this.
 402  */
 403 void load_builtin_commands(const char *prefix, struct cmdnames *cmds)
 404 {
 405         die("not implemented");
 406 }
 407
 408 static int cmd_clone(int argc, const char **argv)
 409 {
 410         const char *branch = NULL;
 411         int full_clone = 0, single_branch = 0, show_progress = isatty(2);
 412         struct option clone_options[] = {
 413                 OPT_STRING('b', "branch", &branch, N_("<branch>"),
 414                            N_("branch to checkout after clone")),
 415                 OPT_BOOL(0, "full-clone", &full_clone,
 416                          N_("when cloning, create full working directory")),
 417                 OPT_BOOL(0, "single-branch", &single_branch,
 418                          N_("only download metadata for the branch that will "
 419                             "be checked out")),
 420                 OPT_END(),
 421         };
 422         const char * const clone_usage[] = {
 423                 N_("scalar clone [<options>] [--] <repo> [<dir>]"),
 424                 NULL
 425         };
 426         const char *url;
 427         char *enlistment = NULL, *dir = NULL;
 428         struct strbuf buf = STRBUF_INIT;
 429         int res;
 430
 431         argc = parse_options(argc, argv, NULL, clone_options, clone_usage, 0);
 432
 433         if (argc == 2) {
 434                 url = argv[0];
 435                 enlistment = xstrdup(argv[1]);
 436         } else if (argc == 1) {
 437                 url = argv[0];
 438
 439                 strbuf_addstr(&buf, url);
 440                 /* Strip trailing slashes, if any */
 441                 while (buf.len > 0 && is_dir_sep(buf.buf[buf.len - 1]))
 442                         strbuf_setlen(&buf, buf.len - 1);
 443                 /* Strip suffix `.git`, if any */
 444                 strbuf_strip_suffix(&buf, ".git");
 445
 446                 enlistment = find_last_dir_sep(buf.buf);
 447                 if (!enlistment) {
 448                         die(_("cannot deduce worktree name from '%s'"), url);
 449                 }
 450                 enlistment = xstrdup(enlistment + 1);
 451         } else {
 452                 usage_msg_opt(_("You must specify a repository to clone."),
 453                               clone_usage, clone_options);
 454         }
 455
 456         if (is_directory(enlistment))
 457                 die(_("directory '%s' exists already"), enlistment);
 458
 459         dir = xstrfmt("%s/src", enlistment);
 460
 461         strbuf_reset(&buf);
 462         if (branch)
 463                 strbuf_addf(&buf, "init.defaultBranch=%s", branch);
 464         else {
 465                 char *b = repo_default_branch_name(the_repository, 1);
 466                 strbuf_addf(&buf, "init.defaultBranch=%s", b);
 467                 free(b);
 468         }
 469
 470         if ((res = run_git("-c", buf.buf, "init", "--", dir, NULL)))
 471                 goto cleanup;
 472
 473         if (chdir(dir) < 0) {
 474                 res = error_errno(_("could not switch to '%s'"), dir);
 475                 goto cleanup;
 476         }
 477
 478         setup_git_directory();
 479
 480         /* common-main already logs `argv` */
 481         trace2_def_repo(the_repository);
 482
 483         if (!branch && !(branch = remote_default_branch(url))) {
 484                 res = error(_("failed to get default branch for '%s'"), url);
 485                 goto cleanup;
 486         }
 487
 488         if (set_config("remote.origin.url=%s", url) ||
 489             set_config("remote.origin.fetch="
 490                        "+refs/heads/%s:refs/remotes/origin/%s",
 491                        single_branch ? branch : "*",
 492                        single_branch ? branch : "*") ||
 493             set_config("remote.origin.promisor=true") ||
 494             set_config("remote.origin.partialCloneFilter=blob:none")) {
 495                 res = error(_("could not configure remote in '%s'"), dir);
 496                 goto cleanup;
 497         }
 498
 499         if (!full_clone &&
 500             (res = run_git("sparse-checkout", "init", "--cone", NULL)))
 501                 goto cleanup;
 502
 503         if (set_recommended_config(0))
 504                 return error(_("could not configure '%s'"), dir);
 505
 506         if ((res = run_git("fetch", "--quiet",
 507                                 show_progress ? "--progress" : "--no-progress",
 508                                 "origin", NULL))) {
 509                 warning(_("partial clone failed; attempting full clone"));
 510
 511                 if (set_config("remote.origin.promisor") ||
 512                     set_config("remote.origin.partialCloneFilter")) {
 513                         res = error(_("could not configure for full clone"));
 514                         goto cleanup;
 515                 }
 516
 517                 if ((res = run_git("fetch", "--quiet",
 518                                         show_progress ? "--progress" : "--no-progress",
 519                                         "origin", NULL)))
 520                         goto cleanup;
 521         }
 522
 523         if ((res = set_config("branch.%s.remote=origin", branch)))
 524                 goto cleanup;
 525         if ((res = set_config("branch.%s.merge=refs/heads/%s",
 526                               branch, branch)))
 527                 goto cleanup;
 528
 529         strbuf_reset(&buf);
 530         strbuf_addf(&buf, "origin/%s", branch);
 531         res = run_git("checkout", "-f", "-t", buf.buf, NULL);
 532         if (res)
 533                 goto cleanup;
 534
 535         res = register_dir();
 536
 537 cleanup:
 538         free(enlistment);
 539         free(dir);
 540         strbuf_release(&buf);
 541         return res;
 542 }
 543
 544 static int cmd_diagnose(int argc, const char **argv)
 545 {
 546         struct option options[] = {
 547                 OPT_END(),
 548         };
 549         const char * const usage[] = {
 550                 N_("scalar diagnose [<enlistment>]"),
 551                 NULL
 552         };
 553         struct strbuf diagnostics_root = STRBUF_INIT;
 554         int res = 0;
 555
 556         argc = parse_options(argc, argv, NULL, options,
 557                              usage, 0);
 558
 559         setup_enlistment_directory(argc, argv, usage, options, &diagnostics_root);
 560         strbuf_addstr(&diagnostics_root, "/.scalarDiagnostics");
 561
 562         res = run_git("diagnose", "--mode=all", "-s", "%Y%m%d_%H%M%S",
 563                       "-o", diagnostics_root.buf, NULL);
 564
 565         strbuf_release(&diagnostics_root);
 566         return res;
 567 }
 568
 569 static int cmd_list(int argc, const char **argv UNUSED)
 570 {
 571         if (argc != 1)
 572                 die(_("`scalar list` does not take arguments"));
 573
 574         if (run_git("config", "--global", "--get-all", "scalar.repo", NULL) < 0)
 575                 return -1;
 576         return 0;
 577 }
 578
 579 static int cmd_register(int argc, const char **argv)
 580 {
 581         struct option options[] = {
 582                 OPT_END(),
 583         };
 584         const char * const usage[] = {
 585                 N_("scalar register [<enlistment>]"),
 586                 NULL
 587         };
 588
 589         argc = parse_options(argc, argv, NULL, options,
 590                              usage, 0);
 591
 592         setup_enlistment_directory(argc, argv, usage, options, NULL);
 593
 594         return register_dir();
 595 }
 596
 597 static int get_scalar_repos(const char *key, const char *value,
 598                             const struct config_context *ctx UNUSED,
 599                             void *data)
 600 {
 601         struct string_list *list = data;
 602
 603         if (!strcmp(key, "scalar.repo"))
 604                 string_list_append(list, value);
 605
 606         return 0;
 607 }
 608
 609 static int remove_deleted_enlistment(struct strbuf *path)
 610 {
 611         int res = 0;
 612         strbuf_realpath_forgiving(path, path->buf, 1);
 613
 614         if (run_git("config", "--global",
 615                     "--unset", "--fixed-value",
 616                     "scalar.repo", path->buf, NULL) < 0)
 617                 res = -1;
 618
 619         if (run_git("config", "--global",
 620                     "--unset", "--fixed-value",
 621                     "maintenance.repo", path->buf, NULL) < 0)
 622                 res = -1;
 623
 624         return res;
 625 }
 626
 627 static int cmd_reconfigure(int argc, const char **argv)
 628 {
 629         int all = 0;
 630         struct option options[] = {
 631                 OPT_BOOL('a', "all", &all,
 632                          N_("reconfigure all registered enlistments")),
 633                 OPT_END(),
 634         };
 635         const char * const usage[] = {
 636                 N_("scalar reconfigure [--all | <enlistment>]"),
 637                 NULL
 638         };
 639         struct string_list scalar_repos = STRING_LIST_INIT_DUP;
 640         int i, res = 0;
 641         struct repository r = { NULL };
 642         struct strbuf commondir = STRBUF_INIT, gitdir = STRBUF_INIT;
 643
 644         argc = parse_options(argc, argv, NULL, options,
 645                              usage, 0);
 646
 647         if (!all) {
 648                 setup_enlistment_directory(argc, argv, usage, options, NULL);
 649
 650                 return set_recommended_config(1);
 651         }
 652
 653         if (argc > 0)
 654                 usage_msg_opt(_("--all or <enlistment>, but not both"),
 655                               usage, options);
 656
 657         git_config(get_scalar_repos, &scalar_repos);
 658
 659         for (i = 0; i < scalar_repos.nr; i++) {
 660                 const char *dir = scalar_repos.items[i].string;
 661
 662                 strbuf_reset(&commondir);
 663                 strbuf_reset(&gitdir);
 664
 665                 if (chdir(dir) < 0) {
 666                         struct strbuf buf = STRBUF_INIT;
 667
 668                         if (errno != ENOENT) {
 669                                 warning_errno(_("could not switch to '%s'"), dir);
 670                                 res = -1;
 671                                 continue;
 672                         }
 673
 674                         strbuf_addstr(&buf, dir);
 675                         if (remove_deleted_enlistment(&buf))
 676                                 res = error(_("could not remove stale "
 677                                               "scalar.repo '%s'"), dir);
 678                         else
 679                                 warning(_("removing stale scalar.repo '%s'"),
 680                                         dir);
 681                         strbuf_release(&buf);
 682                 } else if (discover_git_directory(&commondir, &gitdir) < 0) {
 683                         warning_errno(_("git repository gone in '%s'"), dir);
 684                         res = -1;
 685                 } else {
 686                         git_config_clear();
 687
 688                         the_repository = &r;
 689                         r.commondir = commondir.buf;
 690                         r.gitdir = gitdir.buf;
 691
 692                         if (set_recommended_config(1) < 0)
 693                                 res = -1;
 694                 }
 695         }
 696
 697         string_list_clear(&scalar_repos, 1);
 698         strbuf_release(&commondir);
 699         strbuf_release(&gitdir);
 700
 701         return res;
 702 }
 703
 704 static int cmd_run(int argc, const char **argv)
 705 {
 706         struct option options[] = {
 707                 OPT_END(),
 708         };
 709         struct {
 710                 const char *arg, *task;
 711         } tasks[] = {
 712                 { "config", NULL },
 713                 { "commit-graph", "commit-graph" },
 714                 { "fetch", "prefetch" },
 715                 { "loose-objects", "loose-objects" },
 716                 { "pack-files", "incremental-repack" },
 717                 { NULL, NULL }
 718         };
 719         struct strbuf buf = STRBUF_INIT;
 720         const char *usagestr[] = { NULL, NULL };
 721         int i;
 722
 723         strbuf_addstr(&buf, N_("scalar run <task> [<enlistment>]\nTasks:\n"));
 724         for (i = 0; tasks[i].arg; i++)
 725                 strbuf_addf(&buf, "\t%s\n", tasks[i].arg);
 726         usagestr[0] = buf.buf;
 727
 728         argc = parse_options(argc, argv, NULL, options,
 729                              usagestr, 0);
 730
 731         if (!argc)
 732                 usage_with_options(usagestr, options);
 733
 734         if (!strcmp("all", argv[0])) {
 735                 i = -1;
 736         } else {
 737                 for (i = 0; tasks[i].arg && strcmp(tasks[i].arg, argv[0]); i++)
 738                         ; /* keep looking for the task */
 739
 740                 if (i > 0 && !tasks[i].arg) {
 741                         error(_("no such task: '%s'"), argv[0]);
 742                         usage_with_options(usagestr, options);
 743                 }
 744         }
 745
 746         argc--;
 747         argv++;
 748         setup_enlistment_directory(argc, argv, usagestr, options, NULL);
 749         strbuf_release(&buf);
 750
 751         if (i == 0)
 752                 return register_dir();
 753
 754         if (i > 0)
 755                 return run_git("maintenance", "run",
 756                                "--task", tasks[i].task, NULL);
 757
 758         if (register_dir())
 759                 return -1;
 760         for (i = 1; tasks[i].arg; i++)
 761                 if (run_git("maintenance", "run",
 762                             "--task", tasks[i].task, NULL))
 763                         return -1;
 764         return 0;
 765 }
 766
 767 static int cmd_unregister(int argc, const char **argv)
 768 {
 769         struct option options[] = {
 770                 OPT_END(),
 771         };
 772         const char * const usage[] = {
 773                 N_("scalar unregister [<enlistment>]"),
 774                 NULL
 775         };
 776
 777         argc = parse_options(argc, argv, NULL, options,
 778                              usage, 0);
 779
 780         /*
 781          * Be forgiving when the enlistment or worktree does not even exist any
 782          * longer; This can be the case if a user deleted the worktree by
 783          * mistake and _still_ wants to unregister the thing.
 784          */
 785         if (argc == 1) {
 786                 struct strbuf src_path = STRBUF_INIT, workdir_path = STRBUF_INIT;
 787
 788                 strbuf_addf(&src_path, "%s/src/.git", argv[0]);
 789                 strbuf_addf(&workdir_path, "%s/.git", argv[0]);
 790                 if (!is_directory(src_path.buf) && !is_directory(workdir_path.buf)) {
 791                         /* remove possible matching registrations */
 792                         int res = -1;
 793
 794                         strbuf_strip_suffix(&src_path, "/.git");
 795                         res = remove_deleted_enlistment(&src_path) && res;
 796
 797                         strbuf_strip_suffix(&workdir_path, "/.git");
 798                         res = remove_deleted_enlistment(&workdir_path) && res;
 799
 800                         strbuf_release(&src_path);
 801                         strbuf_release(&workdir_path);
 802                         return res;
 803                 }
 804                 strbuf_release(&src_path);
 805                 strbuf_release(&workdir_path);
 806         }
 807
 808         setup_enlistment_directory(argc, argv, usage, options, NULL);
 809
 810         return unregister_dir();
 811 }
 812
 813 static int cmd_delete(int argc, const char **argv)
 814 {
 815         char *cwd = xgetcwd();
 816         struct option options[] = {
 817                 OPT_END(),
 818         };
 819         const char * const usage[] = {
 820                 N_("scalar delete <enlistment>"),
 821                 NULL
 822         };
 823         struct strbuf enlistment = STRBUF_INIT;
 824         int res = 0;
 825
 826         argc = parse_options(argc, argv, NULL, options,
 827                              usage, 0);
 828
 829         if (argc != 1)
 830                 usage_with_options(usage, options);
 831
 832         setup_enlistment_directory(argc, argv, usage, options, &enlistment);
 833
 834         if (dir_inside_of(cwd, enlistment.buf) >= 0)
 835                 res = error(_("refusing to delete current working directory"));
 836         else {
 837                 close_object_store(the_repository->objects);
 838                 res = delete_enlistment(&enlistment);
 839         }
 840         strbuf_release(&enlistment);
 841         free(cwd);
 842
 843         return res;
 844 }
 845
 846 static int cmd_help(int argc, const char **argv)
 847 {
 848         struct option options[] = {
 849                 OPT_END(),
 850         };
 851         const char * const usage[] = {
 852                 "scalar help",
 853                 NULL
 854         };
 855
 856         argc = parse_options(argc, argv, NULL, options,
 857                              usage, 0);
 858
 859         if (argc != 0)
 860                 usage_with_options(usage, options);
 861
 862         return run_git("help", "scalar", NULL);
 863 }
 864
 865 static int cmd_version(int argc, const char **argv)
 866 {
 867         int verbose = 0, build_options = 0;
 868         struct option options[] = {
 869                 OPT__VERBOSE(&verbose, N_("include Git version")),
 870                 OPT_BOOL(0, "build-options", &build_options,
 871                          N_("include Git's build options")),
 872                 OPT_END(),
 873         };
 874         const char * const usage[] = {
 875                 N_("scalar verbose [-v | --verbose] [--build-options]"),
 876                 NULL
 877         };
 878         struct strbuf buf = STRBUF_INIT;
 879
 880         argc = parse_options(argc, argv, NULL, options,
 881                              usage, 0);
 882
 883         if (argc != 0)
 884                 usage_with_options(usage, options);
 885
 886         get_version_info(&buf, build_options);
 887         fprintf(stderr, "%s\n", buf.buf);
 888         strbuf_release(&buf);
 889
 890         return 0;
 891 }
 892
 893 static struct {
 894         const char *name;
 895         int (*fn)(int, const char **);
 896 } builtins[] = {
 897         { "clone", cmd_clone },
 898         { "list", cmd_list },
 899         { "register", cmd_register },
 900         { "unregister", cmd_unregister },
 901         { "run", cmd_run },
 902         { "reconfigure", cmd_reconfigure },
 903         { "delete", cmd_delete },
 904         { "help", cmd_help },
 905         { "version", cmd_version },
 906         { "diagnose", cmd_diagnose },
 907         { NULL, NULL},
 908 };
 909
 910 int cmd_main(int argc, const char **argv)
 911 {
 912         struct strbuf scalar_usage = STRBUF_INIT;
 913         int i;
 914
 915         while (argc > 1 && *argv[1] == '-') {
 916                 if (!strcmp(argv[1], "-C")) {
 917                         if (argc < 3)
 918                                 die(_("-C requires a <directory>"));
 919                         if (chdir(argv[2]) < 0)
 920                                 die_errno(_("could not change to '%s'"),
 921                                           argv[2]);
 922                         argc -= 2;
 923                         argv += 2;
 924                 } else if (!strcmp(argv[1], "-c")) {
 925                         if (argc < 3)
 926                                 die(_("-c requires a <key>=<value> argument"));
 927                         git_config_push_parameter(argv[2]);
 928                         argc -= 2;
 929                         argv += 2;
 930                 } else
 931                         break;
 932         }
 933
 934         if (argc > 1) {
 935                 argv++;
 936                 argc--;
 937
 938                 for (i = 0; builtins[i].name; i++)
 939                         if (!strcmp(builtins[i].name, argv[0]))
 940                                 return !!builtins[i].fn(argc, argv);
 941         }
 942
 943         strbuf_addstr(&scalar_usage,
 944                       N_("scalar [-C <directory>] [-c <key>=<value>] "
 945                          "<command> [<options>]\n\nCommands:\n"));
 946         for (i = 0; builtins[i].name; i++)
 947                 strbuf_addf(&scalar_usage, "\t%s\n", builtins[i].name);
 948
 949         usage(scalar_usage.buf);
 950 }