builtin/stash.c

   1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "builtin.h"
   3 #include "config.h"
   4 #include "parse-options.h"
   5 #include "refs.h"
   6 #include "lockfile.h"
   7 #include "cache-tree.h"
   8 #include "unpack-trees.h"
   9 #include "merge-recursive.h"
  10 #include "strvec.h"
  11 #include "run-command.h"
  12 #include "dir.h"
  13 #include "rerere.h"
  14 #include "revision.h"
  15 #include "log-tree.h"
  16 #include "diffcore.h"
  17 #include "exec-cmd.h"
  18
  19 #define INCLUDE_ALL_FILES 2
  20
  21 static const char * const git_stash_usage[] = {
  22         N_("git stash list [<options>]"),
  23         N_("git stash show [<options>] [<stash>]"),
  24         N_("git stash drop [-q|--quiet] [<stash>]"),
  25         N_("git stash ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
  26         N_("git stash branch <branchname> [<stash>]"),
  27         N_("git stash clear"),
  28         N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  29            "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
  30            "          [--pathspec-from-file=<file> [--pathspec-file-nul]]\n"
  31            "          [--] [<pathspec>...]]"),
  32         N_("git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  33            "          [-u|--include-untracked] [-a|--all] [<message>]"),
  34         NULL
  35 };
  36
  37 static const char * const git_stash_list_usage[] = {
  38         N_("git stash list [<options>]"),
  39         NULL
  40 };
  41
  42 static const char * const git_stash_show_usage[] = {
  43         N_("git stash show [<options>] [<stash>]"),
  44         NULL
  45 };
  46
  47 static const char * const git_stash_drop_usage[] = {
  48         N_("git stash drop [-q|--quiet] [<stash>]"),
  49         NULL
  50 };
  51
  52 static const char * const git_stash_pop_usage[] = {
  53         N_("git stash pop [--index] [-q|--quiet] [<stash>]"),
  54         NULL
  55 };
  56
  57 static const char * const git_stash_apply_usage[] = {
  58         N_("git stash apply [--index] [-q|--quiet] [<stash>]"),
  59         NULL
  60 };
  61
  62 static const char * const git_stash_branch_usage[] = {
  63         N_("git stash branch <branchname> [<stash>]"),
  64         NULL
  65 };
  66
  67 static const char * const git_stash_clear_usage[] = {
  68         N_("git stash clear"),
  69         NULL
  70 };
  71
  72 static const char * const git_stash_store_usage[] = {
  73         N_("git stash store [-m|--message <message>] [-q|--quiet] <commit>"),
  74         NULL
  75 };
  76
  77 static const char * const git_stash_push_usage[] = {
  78         N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  79            "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
  80            "          [--] [<pathspec>...]]"),
  81         NULL
  82 };
  83
  84 static const char * const git_stash_save_usage[] = {
  85         N_("git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  86            "          [-u|--include-untracked] [-a|--all] [<message>]"),
  87         NULL
  88 };
  89
  90 static const char *ref_stash = "refs/stash";
  91 static struct strbuf stash_index_path = STRBUF_INIT;
  92
  93 /*
  94  * w_commit is set to the commit containing the working tree
  95  * b_commit is set to the base commit
  96  * i_commit is set to the commit containing the index tree
  97  * u_commit is set to the commit containing the untracked files tree
  98  * w_tree is set to the working tree
  99  * b_tree is set to the base tree
 100  * i_tree is set to the index tree
 101  * u_tree is set to the untracked files tree
 102  */
 103 struct stash_info {
 104         struct object_id w_commit;
 105         struct object_id b_commit;
 106         struct object_id i_commit;
 107         struct object_id u_commit;
 108         struct object_id w_tree;
 109         struct object_id b_tree;
 110         struct object_id i_tree;
 111         struct object_id u_tree;
 112         struct strbuf revision;
 113         int is_stash_ref;
 114         int has_u;
 115 };
 116
 117 static void free_stash_info(struct stash_info *info)
 118 {
 119         strbuf_release(&info->revision);
 120 }
 121
 122 static void assert_stash_like(struct stash_info *info, const char *revision)
 123 {
 124         if (get_oidf(&info->b_commit, "%s^1", revision) ||
 125             get_oidf(&info->w_tree, "%s:", revision) ||
 126             get_oidf(&info->b_tree, "%s^1:", revision) ||
 127             get_oidf(&info->i_tree, "%s^2:", revision))
 128                 die(_("'%s' is not a stash-like commit"), revision);
 129 }
 130
 131 static int get_stash_info(struct stash_info *info, int argc, const char **argv)
 132 {
 133         int ret;
 134         char *end_of_rev;
 135         char *expanded_ref;
 136         const char *revision;
 137         const char *commit = NULL;
 138         struct object_id dummy;
 139         struct strbuf symbolic = STRBUF_INIT;
 140
 141         if (argc > 1) {
 142                 int i;
 143                 struct strbuf refs_msg = STRBUF_INIT;
 144
 145                 for (i = 0; i < argc; i++)
 146                         strbuf_addf(&refs_msg, " '%s'", argv[i]);
 147
 148                 fprintf_ln(stderr, _("Too many revisions specified:%s"),
 149                            refs_msg.buf);
 150                 strbuf_release(&refs_msg);
 151
 152                 return -1;
 153         }
 154
 155         if (argc == 1)
 156                 commit = argv[0];
 157
 158         strbuf_init(&info->revision, 0);
 159         if (!commit) {
 160                 if (!ref_exists(ref_stash)) {
 161                         free_stash_info(info);
 162                         fprintf_ln(stderr, _("No stash entries found."));
 163                         return -1;
 164                 }
 165
 166                 strbuf_addf(&info->revision, "%s@{0}", ref_stash);
 167         } else if (strspn(commit, "0123456789") == strlen(commit)) {
 168                 strbuf_addf(&info->revision, "%s@{%s}", ref_stash, commit);
 169         } else {
 170                 strbuf_addstr(&info->revision, commit);
 171         }
 172
 173         revision = info->revision.buf;
 174
 175         if (get_oid(revision, &info->w_commit)) {
 176                 error(_("%s is not a valid reference"), revision);
 177                 free_stash_info(info);
 178                 return -1;
 179         }
 180
 181         assert_stash_like(info, revision);
 182
 183         info->has_u = !get_oidf(&info->u_tree, "%s^3:", revision);
 184
 185         end_of_rev = strchrnul(revision, '@');
 186         strbuf_add(&symbolic, revision, end_of_rev - revision);
 187
 188         ret = dwim_ref(symbolic.buf, symbolic.len, &dummy, &expanded_ref, 0);
 189         strbuf_release(&symbolic);
 190         switch (ret) {
 191         case 0: /* Not found, but valid ref */
 192                 info->is_stash_ref = 0;
 193                 break;
 194         case 1:
 195                 info->is_stash_ref = !strcmp(expanded_ref, ref_stash);
 196                 break;
 197         default: /* Invalid or ambiguous */
 198                 free_stash_info(info);
 199         }
 200
 201         free(expanded_ref);
 202         return !(ret == 0 || ret == 1);
 203 }
 204
 205 static int do_clear_stash(void)
 206 {
 207         struct object_id obj;
 208         if (get_oid(ref_stash, &obj))
 209                 return 0;
 210
 211         return delete_ref(NULL, ref_stash, &obj, 0);
 212 }
 213
 214 static int clear_stash(int argc, const char **argv, const char *prefix)
 215 {
 216         struct option options[] = {
 217                 OPT_END()
 218         };
 219
 220         argc = parse_options(argc, argv, prefix, options,
 221                              git_stash_clear_usage,
 222                              PARSE_OPT_STOP_AT_NON_OPTION);
 223
 224         if (argc)
 225                 return error(_("git stash clear with parameters is "
 226                                "unimplemented"));
 227
 228         return do_clear_stash();
 229 }
 230
 231 static int reset_tree(struct object_id *i_tree, int update, int reset)
 232 {
 233         int nr_trees = 1;
 234         struct unpack_trees_options opts;
 235         struct tree_desc t[MAX_UNPACK_TREES];
 236         struct tree *tree;
 237         struct lock_file lock_file = LOCK_INIT;
 238
 239         read_cache_preload(NULL);
 240         if (refresh_cache(REFRESH_QUIET))
 241                 return -1;
 242
 243         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 244
 245         memset(&opts, 0, sizeof(opts));
 246
 247         tree = parse_tree_indirect(i_tree);
 248         if (parse_tree(tree))
 249                 return -1;
 250
 251         init_tree_desc(t, tree->buffer, tree->size);
 252
 253         opts.head_idx = 1;
 254         opts.src_index = &the_index;
 255         opts.dst_index = &the_index;
 256         opts.merge = 1;
 257         opts.reset = reset;
 258         opts.update = update;
 259         opts.fn = oneway_merge;
 260
 261         if (unpack_trees(nr_trees, t, &opts))
 262                 return -1;
 263
 264         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 265                 return error(_("unable to write new index file"));
 266
 267         return 0;
 268 }
 269
 270 static int diff_tree_binary(struct strbuf *out, struct object_id *w_commit)
 271 {
 272         struct child_process cp = CHILD_PROCESS_INIT;
 273         const char *w_commit_hex = oid_to_hex(w_commit);
 274
 275         /*
 276          * Diff-tree would not be very hard to replace with a native function,
 277          * however it should be done together with apply_cached.
 278          */
 279         cp.git_cmd = 1;
 280         strvec_pushl(&cp.args, "diff-tree", "--binary", NULL);
 281         strvec_pushf(&cp.args, "%s^2^..%s^2", w_commit_hex, w_commit_hex);
 282
 283         return pipe_command(&cp, NULL, 0, out, 0, NULL, 0);
 284 }
 285
 286 static int apply_cached(struct strbuf *out)
 287 {
 288         struct child_process cp = CHILD_PROCESS_INIT;
 289
 290         /*
 291          * Apply currently only reads either from stdin or a file, thus
 292          * apply_all_patches would have to be updated to optionally take a
 293          * buffer.
 294          */
 295         cp.git_cmd = 1;
 296         strvec_pushl(&cp.args, "apply", "--cached", NULL);
 297         return pipe_command(&cp, out->buf, out->len, NULL, 0, NULL, 0);
 298 }
 299
 300 static int reset_head(void)
 301 {
 302         struct child_process cp = CHILD_PROCESS_INIT;
 303
 304         /*
 305          * Reset is overall quite simple, however there is no current public
 306          * API for resetting.
 307          */
 308         cp.git_cmd = 1;
 309         strvec_push(&cp.args, "reset");
 310
 311         return run_command(&cp);
 312 }
 313
 314 static void add_diff_to_buf(struct diff_queue_struct *q,
 315                             struct diff_options *options,
 316                             void *data)
 317 {
 318         int i;
 319
 320         for (i = 0; i < q->nr; i++) {
 321                 strbuf_addstr(data, q->queue[i]->one->path);
 322
 323                 /* NUL-terminate: will be fed to update-index -z */
 324                 strbuf_addch(data, '\0');
 325         }
 326 }
 327
 328 static int get_newly_staged(struct strbuf *out, struct object_id *c_tree)
 329 {
 330         struct child_process cp = CHILD_PROCESS_INIT;
 331         const char *c_tree_hex = oid_to_hex(c_tree);
 332
 333         /*
 334          * diff-index is very similar to diff-tree above, and should be
 335          * converted together with update_index.
 336          */
 337         cp.git_cmd = 1;
 338         strvec_pushl(&cp.args, "diff-index", "--cached", "--name-only",
 339                      "--diff-filter=A", NULL);
 340         strvec_push(&cp.args, c_tree_hex);
 341         return pipe_command(&cp, NULL, 0, out, 0, NULL, 0);
 342 }
 343
 344 static int update_index(struct strbuf *out)
 345 {
 346         struct child_process cp = CHILD_PROCESS_INIT;
 347
 348         /*
 349          * Update-index is very complicated and may need to have a public
 350          * function exposed in order to remove this forking.
 351          */
 352         cp.git_cmd = 1;
 353         strvec_pushl(&cp.args, "update-index", "--add", "--stdin", NULL);
 354         return pipe_command(&cp, out->buf, out->len, NULL, 0, NULL, 0);
 355 }
 356
 357 static int restore_untracked(struct object_id *u_tree)
 358 {
 359         int res;
 360         struct child_process cp = CHILD_PROCESS_INIT;
 361
 362         /*
 363          * We need to run restore files from a given index, but without
 364          * affecting the current index, so we use GIT_INDEX_FILE with
 365          * run_command to fork processes that will not interfere.
 366          */
 367         cp.git_cmd = 1;
 368         strvec_push(&cp.args, "read-tree");
 369         strvec_push(&cp.args, oid_to_hex(u_tree));
 370         strvec_pushf(&cp.env_array, "GIT_INDEX_FILE=%s",
 371                      stash_index_path.buf);
 372         if (run_command(&cp)) {
 373                 remove_path(stash_index_path.buf);
 374                 return -1;
 375         }
 376
 377         child_process_init(&cp);
 378         cp.git_cmd = 1;
 379         strvec_pushl(&cp.args, "checkout-index", "--all", NULL);
 380         strvec_pushf(&cp.env_array, "GIT_INDEX_FILE=%s",
 381                      stash_index_path.buf);
 382
 383         res = run_command(&cp);
 384         remove_path(stash_index_path.buf);
 385         return res;
 386 }
 387
 388 static int do_apply_stash(const char *prefix, struct stash_info *info,
 389                           int index, int quiet)
 390 {
 391         int ret;
 392         int has_index = index;
 393         struct merge_options o;
 394         struct object_id c_tree;
 395         struct object_id index_tree;
 396         struct commit *result;
 397         const struct object_id *bases[1];
 398
 399         read_cache_preload(NULL);
 400         if (refresh_and_write_cache(REFRESH_QUIET, 0, 0))
 401                 return -1;
 402
 403         if (write_cache_as_tree(&c_tree, 0, NULL))
 404                 return error(_("cannot apply a stash in the middle of a merge"));
 405
 406         if (index) {
 407                 if (oideq(&info->b_tree, &info->i_tree) ||
 408                     oideq(&c_tree, &info->i_tree)) {
 409                         has_index = 0;
 410                 } else {
 411                         struct strbuf out = STRBUF_INIT;
 412
 413                         if (diff_tree_binary(&out, &info->w_commit)) {
 414                                 strbuf_release(&out);
 415                                 return error(_("could not generate diff %s^!."),
 416                                              oid_to_hex(&info->w_commit));
 417                         }
 418
 419                         ret = apply_cached(&out);
 420                         strbuf_release(&out);
 421                         if (ret)
 422                                 return error(_("conflicts in index."
 423                                                "Try without --index."));
 424
 425                         discard_cache();
 426                         read_cache();
 427                         if (write_cache_as_tree(&index_tree, 0, NULL))
 428                                 return error(_("could not save index tree"));
 429
 430                         reset_head();
 431                         discard_cache();
 432                         read_cache();
 433                 }
 434         }
 435
 436         if (info->has_u && restore_untracked(&info->u_tree))
 437                 return error(_("could not restore untracked files from stash"));
 438
 439         init_merge_options(&o, the_repository);
 440
 441         o.branch1 = "Updated upstream";
 442         o.branch2 = "Stashed changes";
 443
 444         if (oideq(&info->b_tree, &c_tree))
 445                 o.branch1 = "Version stash was based on";
 446
 447         if (quiet)
 448                 o.verbosity = 0;
 449
 450         if (o.verbosity >= 3)
 451                 printf_ln(_("Merging %s with %s"), o.branch1, o.branch2);
 452
 453         bases[0] = &info->b_tree;
 454
 455         ret = merge_recursive_generic(&o, &c_tree, &info->w_tree, 1, bases,
 456                                       &result);
 457         if (ret) {
 458                 rerere(0);
 459
 460                 if (index)
 461                         fprintf_ln(stderr, _("Index was not unstashed."));
 462
 463                 return ret;
 464         }
 465
 466         if (has_index) {
 467                 if (reset_tree(&index_tree, 0, 0))
 468                         return -1;
 469         } else {
 470                 struct strbuf out = STRBUF_INIT;
 471
 472                 if (get_newly_staged(&out, &c_tree)) {
 473                         strbuf_release(&out);
 474                         return -1;
 475                 }
 476
 477                 if (reset_tree(&c_tree, 0, 1)) {
 478                         strbuf_release(&out);
 479                         return -1;
 480                 }
 481
 482                 ret = update_index(&out);
 483                 strbuf_release(&out);
 484                 if (ret)
 485                         return -1;
 486
 487                 /* read back the result of update_index() back from the disk */
 488                 discard_cache();
 489                 read_cache();
 490         }
 491
 492         if (!quiet) {
 493                 struct child_process cp = CHILD_PROCESS_INIT;
 494
 495                 /*
 496                  * Status is quite simple and could be replaced with calls to
 497                  * wt_status in the future, but it adds complexities which may
 498                  * require more tests.
 499                  */
 500                 cp.git_cmd = 1;
 501                 cp.dir = prefix;
 502                 strvec_pushf(&cp.env_array, GIT_WORK_TREE_ENVIRONMENT"=%s",
 503                              absolute_path(get_git_work_tree()));
 504                 strvec_pushf(&cp.env_array, GIT_DIR_ENVIRONMENT"=%s",
 505                              absolute_path(get_git_dir()));
 506                 strvec_push(&cp.args, "status");
 507                 run_command(&cp);
 508         }
 509
 510         return 0;
 511 }
 512
 513 static int apply_stash(int argc, const char **argv, const char *prefix)
 514 {
 515         int ret;
 516         int quiet = 0;
 517         int index = 0;
 518         struct stash_info info;
 519         struct option options[] = {
 520                 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 521                 OPT_BOOL(0, "index", &index,
 522                          N_("attempt to recreate the index")),
 523                 OPT_END()
 524         };
 525
 526         argc = parse_options(argc, argv, prefix, options,
 527                              git_stash_apply_usage, 0);
 528
 529         if (get_stash_info(&info, argc, argv))
 530                 return -1;
 531
 532         ret = do_apply_stash(prefix, &info, index, quiet);
 533         free_stash_info(&info);
 534         return ret;
 535 }
 536
 537 static int do_drop_stash(struct stash_info *info, int quiet)
 538 {
 539         int ret;
 540         struct child_process cp_reflog = CHILD_PROCESS_INIT;
 541         struct child_process cp = CHILD_PROCESS_INIT;
 542
 543         /*
 544          * reflog does not provide a simple function for deleting refs. One will
 545          * need to be added to avoid implementing too much reflog code here
 546          */
 547
 548         cp_reflog.git_cmd = 1;
 549         strvec_pushl(&cp_reflog.args, "reflog", "delete", "--updateref",
 550                      "--rewrite", NULL);
 551         strvec_push(&cp_reflog.args, info->revision.buf);
 552         ret = run_command(&cp_reflog);
 553         if (!ret) {
 554                 if (!quiet)
 555                         printf_ln(_("Dropped %s (%s)"), info->revision.buf,
 556                                   oid_to_hex(&info->w_commit));
 557         } else {
 558                 return error(_("%s: Could not drop stash entry"),
 559                              info->revision.buf);
 560         }
 561
 562         /*
 563          * This could easily be replaced by get_oid, but currently it will throw
 564          * a fatal error when a reflog is empty, which we can not recover from.
 565          */
 566         cp.git_cmd = 1;
 567         /* Even though --quiet is specified, rev-parse still outputs the hash */
 568         cp.no_stdout = 1;
 569         strvec_pushl(&cp.args, "rev-parse", "--verify", "--quiet", NULL);
 570         strvec_pushf(&cp.args, "%s@{0}", ref_stash);
 571         ret = run_command(&cp);
 572
 573         /* do_clear_stash if we just dropped the last stash entry */
 574         if (ret)
 575                 do_clear_stash();
 576
 577         return 0;
 578 }
 579
 580 static void assert_stash_ref(struct stash_info *info)
 581 {
 582         if (!info->is_stash_ref) {
 583                 error(_("'%s' is not a stash reference"), info->revision.buf);
 584                 free_stash_info(info);
 585                 exit(1);
 586         }
 587 }
 588
 589 static int drop_stash(int argc, const char **argv, const char *prefix)
 590 {
 591         int ret;
 592         int quiet = 0;
 593         struct stash_info info;
 594         struct option options[] = {
 595                 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 596                 OPT_END()
 597         };
 598
 599         argc = parse_options(argc, argv, prefix, options,
 600                              git_stash_drop_usage, 0);
 601
 602         if (get_stash_info(&info, argc, argv))
 603                 return -1;
 604
 605         assert_stash_ref(&info);
 606
 607         ret = do_drop_stash(&info, quiet);
 608         free_stash_info(&info);
 609         return ret;
 610 }
 611
 612 static int pop_stash(int argc, const char **argv, const char *prefix)
 613 {
 614         int ret;
 615         int index = 0;
 616         int quiet = 0;
 617         struct stash_info info;
 618         struct option options[] = {
 619                 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 620                 OPT_BOOL(0, "index", &index,
 621                          N_("attempt to recreate the index")),
 622                 OPT_END()
 623         };
 624
 625         argc = parse_options(argc, argv, prefix, options,
 626                              git_stash_pop_usage, 0);
 627
 628         if (get_stash_info(&info, argc, argv))
 629                 return -1;
 630
 631         assert_stash_ref(&info);
 632         if ((ret = do_apply_stash(prefix, &info, index, quiet)))
 633                 printf_ln(_("The stash entry is kept in case "
 634                             "you need it again."));
 635         else
 636                 ret = do_drop_stash(&info, quiet);
 637
 638         free_stash_info(&info);
 639         return ret;
 640 }
 641
 642 static int branch_stash(int argc, const char **argv, const char *prefix)
 643 {
 644         int ret;
 645         const char *branch = NULL;
 646         struct stash_info info;
 647         struct child_process cp = CHILD_PROCESS_INIT;
 648         struct option options[] = {
 649                 OPT_END()
 650         };
 651
 652         argc = parse_options(argc, argv, prefix, options,
 653                              git_stash_branch_usage, 0);
 654
 655         if (!argc) {
 656                 fprintf_ln(stderr, _("No branch name specified"));
 657                 return -1;
 658         }
 659
 660         branch = argv[0];
 661
 662         if (get_stash_info(&info, argc - 1, argv + 1))
 663                 return -1;
 664
 665         cp.git_cmd = 1;
 666         strvec_pushl(&cp.args, "checkout", "-b", NULL);
 667         strvec_push(&cp.args, branch);
 668         strvec_push(&cp.args, oid_to_hex(&info.b_commit));
 669         ret = run_command(&cp);
 670         if (!ret)
 671                 ret = do_apply_stash(prefix, &info, 1, 0);
 672         if (!ret && info.is_stash_ref)
 673                 ret = do_drop_stash(&info, 0);
 674
 675         free_stash_info(&info);
 676
 677         return ret;
 678 }
 679
 680 static int list_stash(int argc, const char **argv, const char *prefix)
 681 {
 682         struct child_process cp = CHILD_PROCESS_INIT;
 683         struct option options[] = {
 684                 OPT_END()
 685         };
 686
 687         argc = parse_options(argc, argv, prefix, options,
 688                              git_stash_list_usage,
 689                              PARSE_OPT_KEEP_UNKNOWN);
 690
 691         if (!ref_exists(ref_stash))
 692                 return 0;
 693
 694         cp.git_cmd = 1;
 695         strvec_pushl(&cp.args, "log", "--format=%gd: %gs", "-g",
 696                      "--first-parent", "-m", NULL);
 697         strvec_pushv(&cp.args, argv);
 698         strvec_push(&cp.args, ref_stash);
 699         strvec_push(&cp.args, "--");
 700         return run_command(&cp);
 701 }
 702
 703 static int show_stat = 1;
 704 static int show_patch;
 705 static int use_legacy_stash;
 706
 707 static int git_stash_config(const char *var, const char *value, void *cb)
 708 {
 709         if (!strcmp(var, "stash.showstat")) {
 710                 show_stat = git_config_bool(var, value);
 711                 return 0;
 712         }
 713         if (!strcmp(var, "stash.showpatch")) {
 714                 show_patch = git_config_bool(var, value);
 715                 return 0;
 716         }
 717         if (!strcmp(var, "stash.usebuiltin")) {
 718                 use_legacy_stash = !git_config_bool(var, value);
 719                 return 0;
 720         }
 721         return git_diff_basic_config(var, value, cb);
 722 }
 723
 724 static int show_stash(int argc, const char **argv, const char *prefix)
 725 {
 726         int i;
 727         int ret = 0;
 728         struct stash_info info;
 729         struct rev_info rev;
 730         struct strvec stash_args = STRVEC_INIT;
 731         struct strvec revision_args = STRVEC_INIT;
 732         struct option options[] = {
 733                 OPT_END()
 734         };
 735
 736         init_diff_ui_defaults();
 737         git_config(git_diff_ui_config, NULL);
 738         init_revisions(&rev, prefix);
 739
 740         strvec_push(&revision_args, argv[0]);
 741         for (i = 1; i < argc; i++) {
 742                 if (argv[i][0] != '-')
 743                         strvec_push(&stash_args, argv[i]);
 744                 else
 745                         strvec_push(&revision_args, argv[i]);
 746         }
 747
 748         ret = get_stash_info(&info, stash_args.nr, stash_args.v);
 749         strvec_clear(&stash_args);
 750         if (ret)
 751                 return -1;
 752
 753         /*
 754          * The config settings are applied only if there are not passed
 755          * any options.
 756          */
 757         if (revision_args.nr == 1) {
 758                 if (show_stat)
 759                         rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT;
 760
 761                 if (show_patch)
 762                         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
 763
 764                 if (!show_stat && !show_patch) {
 765                         free_stash_info(&info);
 766                         return 0;
 767                 }
 768         }
 769
 770         argc = setup_revisions(revision_args.nr, revision_args.v, &rev, NULL);
 771         if (argc > 1) {
 772                 free_stash_info(&info);
 773                 usage_with_options(git_stash_show_usage, options);
 774         }
 775         if (!rev.diffopt.output_format) {
 776                 rev.diffopt.output_format = DIFF_FORMAT_PATCH;
 777                 diff_setup_done(&rev.diffopt);
 778         }
 779
 780         rev.diffopt.flags.recursive = 1;
 781         setup_diff_pager(&rev.diffopt);
 782         diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt);
 783         log_tree_diff_flush(&rev);
 784
 785         free_stash_info(&info);
 786         return diff_result_code(&rev.diffopt, 0);
 787 }
 788
 789 static int do_store_stash(const struct object_id *w_commit, const char *stash_msg,
 790                           int quiet)
 791 {
 792         if (!stash_msg)
 793                 stash_msg = "Created via \"git stash store\".";
 794
 795         if (update_ref(stash_msg, ref_stash, w_commit, NULL,
 796                        REF_FORCE_CREATE_REFLOG,
 797                        quiet ? UPDATE_REFS_QUIET_ON_ERR :
 798                        UPDATE_REFS_MSG_ON_ERR)) {
 799                 if (!quiet) {
 800                         fprintf_ln(stderr, _("Cannot update %s with %s"),
 801                                    ref_stash, oid_to_hex(w_commit));
 802                 }
 803                 return -1;
 804         }
 805
 806         return 0;
 807 }
 808
 809 static int store_stash(int argc, const char **argv, const char *prefix)
 810 {
 811         int quiet = 0;
 812         const char *stash_msg = NULL;
 813         struct object_id obj;
 814         struct object_context dummy;
 815         struct option options[] = {
 816                 OPT__QUIET(&quiet, N_("be quiet")),
 817                 OPT_STRING('m', "message", &stash_msg, "message",
 818                            N_("stash message")),
 819                 OPT_END()
 820         };
 821
 822         argc = parse_options(argc, argv, prefix, options,
 823                              git_stash_store_usage,
 824                              PARSE_OPT_KEEP_UNKNOWN);
 825
 826         if (argc != 1) {
 827                 if (!quiet)
 828                         fprintf_ln(stderr, _("\"git stash store\" requires one "
 829                                              "<commit> argument"));
 830                 return -1;
 831         }
 832
 833         if (get_oid_with_context(the_repository,
 834                                  argv[0], quiet ? GET_OID_QUIETLY : 0, &obj,
 835                                  &dummy)) {
 836                 if (!quiet)
 837                         fprintf_ln(stderr, _("Cannot update %s with %s"),
 838                                              ref_stash, argv[0]);
 839                 return -1;
 840         }
 841
 842         return do_store_stash(&obj, stash_msg, quiet);
 843 }
 844
 845 static void add_pathspecs(struct strvec *args,
 846                           const struct pathspec *ps) {
 847         int i;
 848
 849         for (i = 0; i < ps->nr; i++)
 850                 strvec_push(args, ps->items[i].original);
 851 }
 852
 853 /*
 854  * `untracked_files` will be filled with the names of untracked files.
 855  * The return value is:
 856  *
 857  * = 0 if there are not any untracked files
 858  * > 0 if there are untracked files
 859  */
 860 static int get_untracked_files(const struct pathspec *ps, int include_untracked,
 861                                struct strbuf *untracked_files)
 862 {
 863         int i;
 864         int found = 0;
 865         struct dir_struct dir;
 866
 867         dir_init(&dir);
 868         if (include_untracked != INCLUDE_ALL_FILES)
 869                 setup_standard_excludes(&dir);
 870
 871         fill_directory(&dir, the_repository->index, ps);
 872         for (i = 0; i < dir.nr; i++) {
 873                 struct dir_entry *ent = dir.entries[i];
 874                 found++;
 875                 strbuf_addstr(untracked_files, ent->name);
 876                 /* NUL-terminate: will be fed to update-index -z */
 877                 strbuf_addch(untracked_files, '\0');
 878         }
 879
 880         dir_clear(&dir);
 881         return found;
 882 }
 883
 884 /*
 885  * The return value of `check_changes_tracked_files()` can be:
 886  *
 887  * < 0 if there was an error
 888  * = 0 if there are no changes.
 889  * > 0 if there are changes.
 890  */
 891 static int check_changes_tracked_files(const struct pathspec *ps)
 892 {
 893         int result;
 894         struct rev_info rev;
 895         struct object_id dummy;
 896         int ret = 0;
 897
 898         /* No initial commit. */
 899         if (get_oid("HEAD", &dummy))
 900                 return -1;
 901
 902         if (read_cache() < 0)
 903                 return -1;
 904
 905         init_revisions(&rev, NULL);
 906         copy_pathspec(&rev.prune_data, ps);
 907
 908         rev.diffopt.flags.quick = 1;
 909         rev.diffopt.flags.ignore_submodules = 1;
 910         rev.abbrev = 0;
 911
 912         add_head_to_pending(&rev);
 913         diff_setup_done(&rev.diffopt);
 914
 915         result = run_diff_index(&rev, 1);
 916         if (diff_result_code(&rev.diffopt, result)) {
 917                 ret = 1;
 918                 goto done;
 919         }
 920
 921         object_array_clear(&rev.pending);
 922         result = run_diff_files(&rev, 0);
 923         if (diff_result_code(&rev.diffopt, result)) {
 924                 ret = 1;
 925                 goto done;
 926         }
 927
 928 done:
 929         clear_pathspec(&rev.prune_data);
 930         return ret;
 931 }
 932
 933 /*
 934  * The function will fill `untracked_files` with the names of untracked files
 935  * It will return 1 if there were any changes and 0 if there were not.
 936  */
 937 static int check_changes(const struct pathspec *ps, int include_untracked,
 938                          struct strbuf *untracked_files)
 939 {
 940         int ret = 0;
 941         if (check_changes_tracked_files(ps))
 942                 ret = 1;
 943
 944         if (include_untracked && get_untracked_files(ps, include_untracked,
 945                                                      untracked_files))
 946                 ret = 1;
 947
 948         return ret;
 949 }
 950
 951 static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 952                                 struct strbuf files)
 953 {
 954         int ret = 0;
 955         struct strbuf untracked_msg = STRBUF_INIT;
 956         struct child_process cp_upd_index = CHILD_PROCESS_INIT;
 957         struct index_state istate = { NULL };
 958
 959         cp_upd_index.git_cmd = 1;
 960         strvec_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
 961                      "--remove", "--stdin", NULL);
 962         strvec_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
 963                          stash_index_path.buf);
 964
 965         strbuf_addf(&untracked_msg, "untracked files on %s\n", msg->buf);
 966         if (pipe_command(&cp_upd_index, files.buf, files.len, NULL, 0,
 967                          NULL, 0)) {
 968                 ret = -1;
 969                 goto done;
 970         }
 971
 972         if (write_index_as_tree(&info->u_tree, &istate, stash_index_path.buf, 0,
 973                                 NULL)) {
 974                 ret = -1;
 975                 goto done;
 976         }
 977
 978         if (commit_tree(untracked_msg.buf, untracked_msg.len,
 979                         &info->u_tree, NULL, &info->u_commit, NULL, NULL)) {
 980                 ret = -1;
 981                 goto done;
 982         }
 983
 984 done:
 985         discard_index(&istate);
 986         strbuf_release(&untracked_msg);
 987         remove_path(stash_index_path.buf);
 988         return ret;
 989 }
 990
 991 static int stash_patch(struct stash_info *info, const struct pathspec *ps,
 992                        struct strbuf *out_patch, int quiet)
 993 {
 994         int ret = 0;
 995         struct child_process cp_read_tree = CHILD_PROCESS_INIT;
 996         struct child_process cp_diff_tree = CHILD_PROCESS_INIT;
 997         struct index_state istate = { NULL };
 998         char *old_index_env = NULL, *old_repo_index_file;
 999
1000         remove_path(stash_index_path.buf);
1001
1002         cp_read_tree.git_cmd = 1;
1003         strvec_pushl(&cp_read_tree.args, "read-tree", "HEAD", NULL);
1004         strvec_pushf(&cp_read_tree.env_array, "GIT_INDEX_FILE=%s",
1005                      stash_index_path.buf);
1006         if (run_command(&cp_read_tree)) {
1007                 ret = -1;
1008                 goto done;
1009         }
1010
1011         /* Find out what the user wants. */
1012         old_repo_index_file = the_repository->index_file;
1013         the_repository->index_file = stash_index_path.buf;
1014         old_index_env = xstrdup_or_null(getenv(INDEX_ENVIRONMENT));
1015         setenv(INDEX_ENVIRONMENT, the_repository->index_file, 1);
1016
1017         ret = run_add_interactive(NULL, "--patch=stash", ps);
1018
1019         the_repository->index_file = old_repo_index_file;
1020         if (old_index_env && *old_index_env)
1021                 setenv(INDEX_ENVIRONMENT, old_index_env, 1);
1022         else
1023                 unsetenv(INDEX_ENVIRONMENT);
1024         FREE_AND_NULL(old_index_env);
1025
1026         /* State of the working tree. */
1027         if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
1028                                 NULL)) {
1029                 ret = -1;
1030                 goto done;
1031         }
1032
1033         cp_diff_tree.git_cmd = 1;
1034         strvec_pushl(&cp_diff_tree.args, "diff-tree", "-p", "-U1", "HEAD",
1035                      oid_to_hex(&info->w_tree), "--", NULL);
1036         if (pipe_command(&cp_diff_tree, NULL, 0, out_patch, 0, NULL, 0)) {
1037                 ret = -1;
1038                 goto done;
1039         }
1040
1041         if (!out_patch->len) {
1042                 if (!quiet)
1043                         fprintf_ln(stderr, _("No changes selected"));
1044                 ret = 1;
1045         }
1046
1047 done:
1048         discard_index(&istate);
1049         remove_path(stash_index_path.buf);
1050         return ret;
1051 }
1052
1053 static int stash_working_tree(struct stash_info *info, const struct pathspec *ps)
1054 {
1055         int ret = 0;
1056         struct rev_info rev;
1057         struct child_process cp_upd_index = CHILD_PROCESS_INIT;
1058         struct strbuf diff_output = STRBUF_INIT;
1059         struct index_state istate = { NULL };
1060
1061         init_revisions(&rev, NULL);
1062         copy_pathspec(&rev.prune_data, ps);
1063
1064         set_alternate_index_output(stash_index_path.buf);
1065         if (reset_tree(&info->i_tree, 0, 0)) {
1066                 ret = -1;
1067                 goto done;
1068         }
1069         set_alternate_index_output(NULL);
1070
1071         rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
1072         rev.diffopt.format_callback = add_diff_to_buf;
1073         rev.diffopt.format_callback_data = &diff_output;
1074
1075         if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
1076                 ret = -1;
1077                 goto done;
1078         }
1079
1080         add_pending_object(&rev, parse_object(the_repository, &info->b_commit),
1081                            "");
1082         if (run_diff_index(&rev, 0)) {
1083                 ret = -1;
1084                 goto done;
1085         }
1086
1087         cp_upd_index.git_cmd = 1;
1088         strvec_pushl(&cp_upd_index.args, "update-index",
1089                      "--ignore-skip-worktree-entries",
1090                      "-z", "--add", "--remove", "--stdin", NULL);
1091         strvec_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
1092                      stash_index_path.buf);
1093
1094         if (pipe_command(&cp_upd_index, diff_output.buf, diff_output.len,
1095                          NULL, 0, NULL, 0)) {
1096                 ret = -1;
1097                 goto done;
1098         }
1099
1100         if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
1101                                 NULL)) {
1102                 ret = -1;
1103                 goto done;
1104         }
1105
1106 done:
1107         discard_index(&istate);
1108         UNLEAK(rev);
1109         object_array_clear(&rev.pending);
1110         clear_pathspec(&rev.prune_data);
1111         strbuf_release(&diff_output);
1112         remove_path(stash_index_path.buf);
1113         return ret;
1114 }
1115
1116 static int do_create_stash(const struct pathspec *ps, struct strbuf *stash_msg_buf,
1117                            int include_untracked, int patch_mode,
1118                            struct stash_info *info, struct strbuf *patch,
1119                            int quiet)
1120 {
1121         int ret = 0;
1122         int flags = 0;
1123         int untracked_commit_option = 0;
1124         const char *head_short_sha1 = NULL;
1125         const char *branch_ref = NULL;
1126         const char *branch_name = "(no branch)";
1127         struct commit *head_commit = NULL;
1128         struct commit_list *parents = NULL;
1129         struct strbuf msg = STRBUF_INIT;
1130         struct strbuf commit_tree_label = STRBUF_INIT;
1131         struct strbuf untracked_files = STRBUF_INIT;
1132
1133         prepare_fallback_ident("git stash", "git@stash");
1134
1135         read_cache_preload(NULL);
1136         if (refresh_and_write_cache(REFRESH_QUIET, 0, 0) < 0) {
1137                 ret = -1;
1138                 goto done;
1139         }
1140
1141         if (get_oid("HEAD", &info->b_commit)) {
1142                 if (!quiet)
1143                         fprintf_ln(stderr, _("You do not have "
1144                                              "the initial commit yet"));
1145                 ret = -1;
1146                 goto done;
1147         } else {
1148                 head_commit = lookup_commit(the_repository, &info->b_commit);
1149         }
1150
1151         if (!check_changes(ps, include_untracked, &untracked_files)) {
1152                 ret = 1;
1153                 goto done;
1154         }
1155
1156         branch_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flags);
1157         if (flags & REF_ISSYMREF)
1158                 branch_name = strrchr(branch_ref, '/') + 1;
1159         head_short_sha1 = find_unique_abbrev(&head_commit->object.oid,
1160                                              DEFAULT_ABBREV);
1161         strbuf_addf(&msg, "%s: %s ", branch_name, head_short_sha1);
1162         pp_commit_easy(CMIT_FMT_ONELINE, head_commit, &msg);
1163
1164         strbuf_addf(&commit_tree_label, "index on %s\n", msg.buf);
1165         commit_list_insert(head_commit, &parents);
1166         if (write_cache_as_tree(&info->i_tree, 0, NULL) ||
1167             commit_tree(commit_tree_label.buf, commit_tree_label.len,
1168                         &info->i_tree, parents, &info->i_commit, NULL, NULL)) {
1169                 if (!quiet)
1170                         fprintf_ln(stderr, _("Cannot save the current "
1171                                              "index state"));
1172                 ret = -1;
1173                 goto done;
1174         }
1175
1176         if (include_untracked) {
1177                 if (save_untracked_files(info, &msg, untracked_files)) {
1178                         if (!quiet)
1179                                 fprintf_ln(stderr, _("Cannot save "
1180                                                      "the untracked files"));
1181                         ret = -1;
1182                         goto done;
1183                 }
1184                 untracked_commit_option = 1;
1185         }
1186         if (patch_mode) {
1187                 ret = stash_patch(info, ps, patch, quiet);
1188                 if (ret < 0) {
1189                         if (!quiet)
1190                                 fprintf_ln(stderr, _("Cannot save the current "
1191                                                      "worktree state"));
1192                         goto done;
1193                 } else if (ret > 0) {
1194                         goto done;
1195                 }
1196         } else {
1197                 if (stash_working_tree(info, ps)) {
1198                         if (!quiet)
1199                                 fprintf_ln(stderr, _("Cannot save the current "
1200                                                      "worktree state"));
1201                         ret = -1;
1202                         goto done;
1203                 }
1204         }
1205
1206         if (!stash_msg_buf->len)
1207                 strbuf_addf(stash_msg_buf, "WIP on %s", msg.buf);
1208         else
1209                 strbuf_insertf(stash_msg_buf, 0, "On %s: ", branch_name);
1210
1211         /*
1212          * `parents` will be empty after calling `commit_tree()`, so there is
1213          * no need to call `free_commit_list()`
1214          */
1215         parents = NULL;
1216         if (untracked_commit_option)
1217                 commit_list_insert(lookup_commit(the_repository,
1218                                                  &info->u_commit),
1219                                    &parents);
1220         commit_list_insert(lookup_commit(the_repository, &info->i_commit),
1221                            &parents);
1222         commit_list_insert(head_commit, &parents);
1223
1224         if (commit_tree(stash_msg_buf->buf, stash_msg_buf->len, &info->w_tree,
1225                         parents, &info->w_commit, NULL, NULL)) {
1226                 if (!quiet)
1227                         fprintf_ln(stderr, _("Cannot record "
1228                                              "working tree state"));
1229                 ret = -1;
1230                 goto done;
1231         }
1232
1233 done:
1234         strbuf_release(&commit_tree_label);
1235         strbuf_release(&msg);
1236         strbuf_release(&untracked_files);
1237         return ret;
1238 }
1239
1240 static int create_stash(int argc, const char **argv, const char *prefix)
1241 {
1242         int ret = 0;
1243         struct strbuf stash_msg_buf = STRBUF_INIT;
1244         struct stash_info info;
1245         struct pathspec ps;
1246
1247         /* Starting with argv[1], since argv[0] is "create" */
1248         strbuf_join_argv(&stash_msg_buf, argc - 1, ++argv, ' ');
1249
1250         memset(&ps, 0, sizeof(ps));
1251         if (!check_changes_tracked_files(&ps))
1252                 return 0;
1253
1254         ret = do_create_stash(&ps, &stash_msg_buf, 0, 0, &info,
1255                               NULL, 0);
1256         if (!ret)
1257                 printf_ln("%s", oid_to_hex(&info.w_commit));
1258
1259         strbuf_release(&stash_msg_buf);
1260         return ret;
1261 }
1262
1263 static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int quiet,
1264                          int keep_index, int patch_mode, int include_untracked)
1265 {
1266         int ret = 0;
1267         struct stash_info info;
1268         struct strbuf patch = STRBUF_INIT;
1269         struct strbuf stash_msg_buf = STRBUF_INIT;
1270         struct strbuf untracked_files = STRBUF_INIT;
1271
1272         if (patch_mode && keep_index == -1)
1273                 keep_index = 1;
1274
1275         if (patch_mode && include_untracked) {
1276                 fprintf_ln(stderr, _("Can't use --patch and --include-untracked"
1277                                      " or --all at the same time"));
1278                 ret = -1;
1279                 goto done;
1280         }
1281
1282         read_cache_preload(NULL);
1283         if (!include_untracked && ps->nr) {
1284                 int i;
1285                 char *ps_matched = xcalloc(ps->nr, 1);
1286
1287                 for (i = 0; i < active_nr; i++)
1288                         ce_path_match(&the_index, active_cache[i], ps,
1289                                       ps_matched);
1290
1291                 if (report_path_error(ps_matched, ps)) {
1292                         fprintf_ln(stderr, _("Did you forget to 'git add'?"));
1293                         ret = -1;
1294                         free(ps_matched);
1295                         goto done;
1296                 }
1297                 free(ps_matched);
1298         }
1299
1300         if (refresh_and_write_cache(REFRESH_QUIET, 0, 0)) {
1301                 ret = -1;
1302                 goto done;
1303         }
1304
1305         if (!check_changes(ps, include_untracked, &untracked_files)) {
1306                 if (!quiet)
1307                         printf_ln(_("No local changes to save"));
1308                 goto done;
1309         }
1310
1311         if (!reflog_exists(ref_stash) && do_clear_stash()) {
1312                 ret = -1;
1313                 if (!quiet)
1314                         fprintf_ln(stderr, _("Cannot initialize stash"));
1315                 goto done;
1316         }
1317
1318         if (stash_msg)
1319                 strbuf_addstr(&stash_msg_buf, stash_msg);
1320         if (do_create_stash(ps, &stash_msg_buf, include_untracked, patch_mode,
1321                             &info, &patch, quiet)) {
1322                 ret = -1;
1323                 goto done;
1324         }
1325
1326         if (do_store_stash(&info.w_commit, stash_msg_buf.buf, 1)) {
1327                 ret = -1;
1328                 if (!quiet)
1329                         fprintf_ln(stderr, _("Cannot save the current status"));
1330                 goto done;
1331         }
1332
1333         if (!quiet)
1334                 printf_ln(_("Saved working directory and index state %s"),
1335                           stash_msg_buf.buf);
1336
1337         if (!patch_mode) {
1338                 if (include_untracked && !ps->nr) {
1339                         struct child_process cp = CHILD_PROCESS_INIT;
1340
1341                         cp.git_cmd = 1;
1342                         strvec_pushl(&cp.args, "clean", "--force",
1343                                      "--quiet", "-d", NULL);
1344                         if (include_untracked == INCLUDE_ALL_FILES)
1345                                 strvec_push(&cp.args, "-x");
1346                         if (run_command(&cp)) {
1347                                 ret = -1;
1348                                 goto done;
1349                         }
1350                 }
1351                 discard_cache();
1352                 if (ps->nr) {
1353                         struct child_process cp_add = CHILD_PROCESS_INIT;
1354                         struct child_process cp_diff = CHILD_PROCESS_INIT;
1355                         struct child_process cp_apply = CHILD_PROCESS_INIT;
1356                         struct strbuf out = STRBUF_INIT;
1357
1358                         cp_add.git_cmd = 1;
1359                         strvec_push(&cp_add.args, "add");
1360                         if (!include_untracked)
1361                                 strvec_push(&cp_add.args, "-u");
1362                         if (include_untracked == INCLUDE_ALL_FILES)
1363                                 strvec_push(&cp_add.args, "--force");
1364                         strvec_push(&cp_add.args, "--");
1365                         add_pathspecs(&cp_add.args, ps);
1366                         if (run_command(&cp_add)) {
1367                                 ret = -1;
1368                                 goto done;
1369                         }
1370
1371                         cp_diff.git_cmd = 1;
1372                         strvec_pushl(&cp_diff.args, "diff-index", "-p",
1373                                      "--cached", "--binary", "HEAD", "--",
1374                                      NULL);
1375                         add_pathspecs(&cp_diff.args, ps);
1376                         if (pipe_command(&cp_diff, NULL, 0, &out, 0, NULL, 0)) {
1377                                 ret = -1;
1378                                 goto done;
1379                         }
1380
1381                         cp_apply.git_cmd = 1;
1382                         strvec_pushl(&cp_apply.args, "apply", "--index",
1383                                      "-R", NULL);
1384                         if (pipe_command(&cp_apply, out.buf, out.len, NULL, 0,
1385                                          NULL, 0)) {
1386                                 ret = -1;
1387                                 goto done;
1388                         }
1389                 } else {
1390                         struct child_process cp = CHILD_PROCESS_INIT;
1391                         cp.git_cmd = 1;
1392                         strvec_pushl(&cp.args, "reset", "--hard", "-q",
1393                                      "--no-recurse-submodules", NULL);
1394                         if (run_command(&cp)) {
1395                                 ret = -1;
1396                                 goto done;
1397                         }
1398                 }
1399
1400                 if (keep_index == 1 && !is_null_oid(&info.i_tree)) {
1401                         struct child_process cp = CHILD_PROCESS_INIT;
1402
1403                         cp.git_cmd = 1;
1404                         strvec_pushl(&cp.args, "checkout", "--no-overlay",
1405                                      oid_to_hex(&info.i_tree), "--", NULL);
1406                         if (!ps->nr)
1407                                 strvec_push(&cp.args, ":/");
1408                         else
1409                                 add_pathspecs(&cp.args, ps);
1410                         if (run_command(&cp)) {
1411                                 ret = -1;
1412                                 goto done;
1413                         }
1414                 }
1415                 goto done;
1416         } else {
1417                 struct child_process cp = CHILD_PROCESS_INIT;
1418
1419                 cp.git_cmd = 1;
1420                 strvec_pushl(&cp.args, "apply", "-R", NULL);
1421
1422                 if (pipe_command(&cp, patch.buf, patch.len, NULL, 0, NULL, 0)) {
1423                         if (!quiet)
1424                                 fprintf_ln(stderr, _("Cannot remove "
1425                                                      "worktree changes"));
1426                         ret = -1;
1427                         goto done;
1428                 }
1429
1430                 if (keep_index < 1) {
1431                         struct child_process cp = CHILD_PROCESS_INIT;
1432
1433                         cp.git_cmd = 1;
1434                         strvec_pushl(&cp.args, "reset", "-q", "--", NULL);
1435                         add_pathspecs(&cp.args, ps);
1436                         if (run_command(&cp)) {
1437                                 ret = -1;
1438                                 goto done;
1439                         }
1440                 }
1441                 goto done;
1442         }
1443
1444 done:
1445         strbuf_release(&stash_msg_buf);
1446         return ret;
1447 }
1448
1449 static int push_stash(int argc, const char **argv, const char *prefix,
1450                       int push_assumed)
1451 {
1452         int force_assume = 0;
1453         int keep_index = -1;
1454         int patch_mode = 0;
1455         int include_untracked = 0;
1456         int quiet = 0;
1457         int pathspec_file_nul = 0;
1458         const char *stash_msg = NULL;
1459         const char *pathspec_from_file = NULL;
1460         struct pathspec ps;
1461         struct option options[] = {
1462                 OPT_BOOL('k', "keep-index", &keep_index,
1463                          N_("keep index")),
1464                 OPT_BOOL('p', "patch", &patch_mode,
1465                          N_("stash in patch mode")),
1466                 OPT__QUIET(&quiet, N_("quiet mode")),
1467                 OPT_BOOL('u', "include-untracked", &include_untracked,
1468                          N_("include untracked files in stash")),
1469                 OPT_SET_INT('a', "all", &include_untracked,
1470                             N_("include ignore files"), 2),
1471                 OPT_STRING('m', "message", &stash_msg, N_("message"),
1472                            N_("stash message")),
1473                 OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
1474                 OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
1475                 OPT_END()
1476         };
1477
1478         if (argc) {
1479                 force_assume = !strcmp(argv[0], "-p");
1480                 argc = parse_options(argc, argv, prefix, options,
1481                                      git_stash_push_usage,
1482                                      PARSE_OPT_KEEP_DASHDASH);
1483         }
1484
1485         if (argc) {
1486                 if (!strcmp(argv[0], "--")) {
1487                         argc--;
1488                         argv++;
1489                 } else if (push_assumed && !force_assume) {
1490                         die("subcommand wasn't specified; 'push' can't be assumed due to unexpected token '%s'",
1491                             argv[0]);
1492                 }
1493         }
1494
1495         parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL | PATHSPEC_PREFIX_ORIGIN,
1496                        prefix, argv);
1497
1498         if (pathspec_from_file) {
1499                 if (patch_mode)
1500                         die(_("--pathspec-from-file is incompatible with --patch"));
1501
1502                 if (ps.nr)
1503                         die(_("--pathspec-from-file is incompatible with pathspec arguments"));
1504
1505                 parse_pathspec_file(&ps, 0,
1506                                     PATHSPEC_PREFER_FULL | PATHSPEC_PREFIX_ORIGIN,
1507                                     prefix, pathspec_from_file, pathspec_file_nul);
1508         } else if (pathspec_file_nul) {
1509                 die(_("--pathspec-file-nul requires --pathspec-from-file"));
1510         }
1511
1512         return do_push_stash(&ps, stash_msg, quiet, keep_index, patch_mode,
1513                              include_untracked);
1514 }
1515
1516 static int save_stash(int argc, const char **argv, const char *prefix)
1517 {
1518         int keep_index = -1;
1519         int patch_mode = 0;
1520         int include_untracked = 0;
1521         int quiet = 0;
1522         int ret = 0;
1523         const char *stash_msg = NULL;
1524         struct pathspec ps;
1525         struct strbuf stash_msg_buf = STRBUF_INIT;
1526         struct option options[] = {
1527                 OPT_BOOL('k', "keep-index", &keep_index,
1528                          N_("keep index")),
1529                 OPT_BOOL('p', "patch", &patch_mode,
1530                          N_("stash in patch mode")),
1531                 OPT__QUIET(&quiet, N_("quiet mode")),
1532                 OPT_BOOL('u', "include-untracked", &include_untracked,
1533                          N_("include untracked files in stash")),
1534                 OPT_SET_INT('a', "all", &include_untracked,
1535                             N_("include ignore files"), 2),
1536                 OPT_STRING('m', "message", &stash_msg, "message",
1537                            N_("stash message")),
1538                 OPT_END()
1539         };
1540
1541         argc = parse_options(argc, argv, prefix, options,
1542                              git_stash_save_usage,
1543                              PARSE_OPT_KEEP_DASHDASH);
1544
1545         if (argc)
1546                 stash_msg = strbuf_join_argv(&stash_msg_buf, argc, argv, ' ');
1547
1548         memset(&ps, 0, sizeof(ps));
1549         ret = do_push_stash(&ps, stash_msg, quiet, keep_index,
1550                             patch_mode, include_untracked);
1551
1552         strbuf_release(&stash_msg_buf);
1553         return ret;
1554 }
1555
1556 int cmd_stash(int argc, const char **argv, const char *prefix)
1557 {
1558         pid_t pid = getpid();
1559         const char *index_file;
1560         struct strvec args = STRVEC_INIT;
1561
1562         struct option options[] = {
1563                 OPT_END()
1564         };
1565
1566         git_config(git_stash_config, NULL);
1567
1568         if (use_legacy_stash ||
1569             !git_env_bool("GIT_TEST_STASH_USE_BUILTIN", -1))
1570                 warning(_("the stash.useBuiltin support has been removed!\n"
1571                           "See its entry in 'git help config' for details."));
1572
1573         argc = parse_options(argc, argv, prefix, options, git_stash_usage,
1574                              PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
1575
1576         index_file = get_index_file();
1577         strbuf_addf(&stash_index_path, "%s.stash.%" PRIuMAX, index_file,
1578                     (uintmax_t)pid);
1579
1580         if (!argc)
1581                 return !!push_stash(0, NULL, prefix, 0);
1582         else if (!strcmp(argv[0], "apply"))
1583                 return !!apply_stash(argc, argv, prefix);
1584         else if (!strcmp(argv[0], "clear"))
1585                 return !!clear_stash(argc, argv, prefix);
1586         else if (!strcmp(argv[0], "drop"))
1587                 return !!drop_stash(argc, argv, prefix);
1588         else if (!strcmp(argv[0], "pop"))
1589                 return !!pop_stash(argc, argv, prefix);
1590         else if (!strcmp(argv[0], "branch"))
1591                 return !!branch_stash(argc, argv, prefix);
1592         else if (!strcmp(argv[0], "list"))
1593                 return !!list_stash(argc, argv, prefix);
1594         else if (!strcmp(argv[0], "show"))
1595                 return !!show_stash(argc, argv, prefix);
1596         else if (!strcmp(argv[0], "store"))
1597                 return !!store_stash(argc, argv, prefix);
1598         else if (!strcmp(argv[0], "create"))
1599                 return !!create_stash(argc, argv, prefix);
1600         else if (!strcmp(argv[0], "push"))
1601                 return !!push_stash(argc, argv, prefix, 0);
1602         else if (!strcmp(argv[0], "save"))
1603                 return !!save_stash(argc, argv, prefix);
1604         else if (*argv[0] != '-')
1605                 usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
1606                               git_stash_usage, options);
1607
1608         /* Assume 'stash push' */
1609         strvec_push(&args, "push");
1610         strvec_pushv(&args, argv);
1611         return !!push_stash(args.nr, args.v, prefix, 1);
1612 }