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 "argv-array.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);
 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         argv_array_pushl(&cp.args, "diff-tree", "--binary", NULL);
 281         argv_array_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         argv_array_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         argv_array_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         argv_array_pushl(&cp.args, "diff-index", "--cached", "--name-only",
 339                          "--diff-filter=A", NULL);
 340         argv_array_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         argv_array_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         argv_array_push(&cp.args, "read-tree");
 369         argv_array_push(&cp.args, oid_to_hex(u_tree));
 370         argv_array_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         argv_array_pushl(&cp.args, "checkout-index", "--all", NULL);
 380         argv_array_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                 argv_array_pushf(&cp.env_array, GIT_WORK_TREE_ENVIRONMENT"=%s",
 503                                  absolute_path(get_git_work_tree()));
 504                 argv_array_pushf(&cp.env_array, GIT_DIR_ENVIRONMENT"=%s",
 505                                  absolute_path(get_git_dir()));
 506                 argv_array_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         argv_array_pushl(&cp_reflog.args, "reflog", "delete", "--updateref",
 550                          "--rewrite", NULL);
 551         argv_array_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         argv_array_pushl(&cp.args, "rev-parse", "--verify", "--quiet", NULL);
 570         argv_array_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         argv_array_pushl(&cp.args, "checkout", "-b", NULL);
 667         argv_array_push(&cp.args, branch);
 668         argv_array_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         argv_array_pushl(&cp.args, "log", "--format=%gd: %gs", "-g",
 696                          "--first-parent", "-m", NULL);
 697         argv_array_pushv(&cp.args, argv);
 698         argv_array_push(&cp.args, ref_stash);
 699         argv_array_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 argv_array stash_args = ARGV_ARRAY_INIT;
 731         struct argv_array revision_args = ARGV_ARRAY_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         argv_array_push(&revision_args, argv[0]);
 741         for (i = 1; i < argc; i++) {
 742                 if (argv[i][0] != '-')
 743                         argv_array_push(&stash_args, argv[i]);
 744                 else
 745                         argv_array_push(&revision_args, argv[i]);
 746         }
 747
 748         ret = get_stash_info(&info, stash_args.argc, stash_args.argv);
 749         argv_array_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.argc == 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.argc, revision_args.argv, &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 argv_array *args,
 846                           const struct pathspec *ps) {
 847         int i;
 848
 849         for (i = 0; i < ps->nr; i++)
 850                 argv_array_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 max_len;
 865         int found = 0;
 866         char *seen;
 867         struct dir_struct dir;
 868
 869         memset(&dir, 0, sizeof(dir));
 870         if (include_untracked != INCLUDE_ALL_FILES)
 871                 setup_standard_excludes(&dir);
 872
 873         seen = xcalloc(ps->nr, 1);
 874
 875         max_len = fill_directory(&dir, the_repository->index, ps);
 876         for (i = 0; i < dir.nr; i++) {
 877                 struct dir_entry *ent = dir.entries[i];
 878                 if (dir_path_match(&the_index, ent, ps, max_len, seen)) {
 879                         found++;
 880                         strbuf_addstr(untracked_files, ent->name);
 881                         /* NUL-terminate: will be fed to update-index -z */
 882                         strbuf_addch(untracked_files, '\0');
 883                 }
 884                 free(ent);
 885         }
 886
 887         free(seen);
 888         free(dir.entries);
 889         free(dir.ignored);
 890         clear_directory(&dir);
 891         return found;
 892 }
 893
 894 /*
 895  * The return value of `check_changes_tracked_files()` can be:
 896  *
 897  * < 0 if there was an error
 898  * = 0 if there are no changes.
 899  * > 0 if there are changes.
 900  */
 901 static int check_changes_tracked_files(const struct pathspec *ps)
 902 {
 903         int result;
 904         struct rev_info rev;
 905         struct object_id dummy;
 906         int ret = 0;
 907
 908         /* No initial commit. */
 909         if (get_oid("HEAD", &dummy))
 910                 return -1;
 911
 912         if (read_cache() < 0)
 913                 return -1;
 914
 915         init_revisions(&rev, NULL);
 916         copy_pathspec(&rev.prune_data, ps);
 917
 918         rev.diffopt.flags.quick = 1;
 919         rev.diffopt.flags.ignore_submodules = 1;
 920         rev.abbrev = 0;
 921
 922         add_head_to_pending(&rev);
 923         diff_setup_done(&rev.diffopt);
 924
 925         result = run_diff_index(&rev, 1);
 926         if (diff_result_code(&rev.diffopt, result)) {
 927                 ret = 1;
 928                 goto done;
 929         }
 930
 931         object_array_clear(&rev.pending);
 932         result = run_diff_files(&rev, 0);
 933         if (diff_result_code(&rev.diffopt, result)) {
 934                 ret = 1;
 935                 goto done;
 936         }
 937
 938 done:
 939         clear_pathspec(&rev.prune_data);
 940         return ret;
 941 }
 942
 943 /*
 944  * The function will fill `untracked_files` with the names of untracked files
 945  * It will return 1 if there were any changes and 0 if there were not.
 946  */
 947 static int check_changes(const struct pathspec *ps, int include_untracked,
 948                          struct strbuf *untracked_files)
 949 {
 950         int ret = 0;
 951         if (check_changes_tracked_files(ps))
 952                 ret = 1;
 953
 954         if (include_untracked && get_untracked_files(ps, include_untracked,
 955                                                      untracked_files))
 956                 ret = 1;
 957
 958         return ret;
 959 }
 960
 961 static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 962                                 struct strbuf files)
 963 {
 964         int ret = 0;
 965         struct strbuf untracked_msg = STRBUF_INIT;
 966         struct child_process cp_upd_index = CHILD_PROCESS_INIT;
 967         struct index_state istate = { NULL };
 968
 969         cp_upd_index.git_cmd = 1;
 970         argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
 971                          "--remove", "--stdin", NULL);
 972         argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
 973                          stash_index_path.buf);
 974
 975         strbuf_addf(&untracked_msg, "untracked files on %s\n", msg->buf);
 976         if (pipe_command(&cp_upd_index, files.buf, files.len, NULL, 0,
 977                          NULL, 0)) {
 978                 ret = -1;
 979                 goto done;
 980         }
 981
 982         if (write_index_as_tree(&info->u_tree, &istate, stash_index_path.buf, 0,
 983                                 NULL)) {
 984                 ret = -1;
 985                 goto done;
 986         }
 987
 988         if (commit_tree(untracked_msg.buf, untracked_msg.len,
 989                         &info->u_tree, NULL, &info->u_commit, NULL, NULL)) {
 990                 ret = -1;
 991                 goto done;
 992         }
 993
 994 done:
 995         discard_index(&istate);
 996         strbuf_release(&untracked_msg);
 997         remove_path(stash_index_path.buf);
 998         return ret;
 999 }
1000
1001 static int stash_patch(struct stash_info *info, const struct pathspec *ps,
1002                        struct strbuf *out_patch, int quiet)
1003 {
1004         int ret = 0;
1005         struct child_process cp_read_tree = CHILD_PROCESS_INIT;
1006         struct child_process cp_diff_tree = CHILD_PROCESS_INIT;
1007         struct index_state istate = { NULL };
1008         char *old_index_env = NULL, *old_repo_index_file;
1009
1010         remove_path(stash_index_path.buf);
1011
1012         cp_read_tree.git_cmd = 1;
1013         argv_array_pushl(&cp_read_tree.args, "read-tree", "HEAD", NULL);
1014         argv_array_pushf(&cp_read_tree.env_array, "GIT_INDEX_FILE=%s",
1015                          stash_index_path.buf);
1016         if (run_command(&cp_read_tree)) {
1017                 ret = -1;
1018                 goto done;
1019         }
1020
1021         /* Find out what the user wants. */
1022         old_repo_index_file = the_repository->index_file;
1023         the_repository->index_file = stash_index_path.buf;
1024         old_index_env = xstrdup_or_null(getenv(INDEX_ENVIRONMENT));
1025         setenv(INDEX_ENVIRONMENT, the_repository->index_file, 1);
1026
1027         ret = run_add_interactive(NULL, "--patch=stash", ps);
1028
1029         the_repository->index_file = old_repo_index_file;
1030         if (old_index_env && *old_index_env)
1031                 setenv(INDEX_ENVIRONMENT, old_index_env, 1);
1032         else
1033                 unsetenv(INDEX_ENVIRONMENT);
1034         FREE_AND_NULL(old_index_env);
1035
1036         /* State of the working tree. */
1037         if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
1038                                 NULL)) {
1039                 ret = -1;
1040                 goto done;
1041         }
1042
1043         cp_diff_tree.git_cmd = 1;
1044         argv_array_pushl(&cp_diff_tree.args, "diff-tree", "-p", "-U1", "HEAD",
1045                          oid_to_hex(&info->w_tree), "--", NULL);
1046         if (pipe_command(&cp_diff_tree, NULL, 0, out_patch, 0, NULL, 0)) {
1047                 ret = -1;
1048                 goto done;
1049         }
1050
1051         if (!out_patch->len) {
1052                 if (!quiet)
1053                         fprintf_ln(stderr, _("No changes selected"));
1054                 ret = 1;
1055         }
1056
1057 done:
1058         discard_index(&istate);
1059         remove_path(stash_index_path.buf);
1060         return ret;
1061 }
1062
1063 static int stash_working_tree(struct stash_info *info, const struct pathspec *ps)
1064 {
1065         int ret = 0;
1066         struct rev_info rev;
1067         struct child_process cp_upd_index = CHILD_PROCESS_INIT;
1068         struct strbuf diff_output = STRBUF_INIT;
1069         struct index_state istate = { NULL };
1070
1071         init_revisions(&rev, NULL);
1072         copy_pathspec(&rev.prune_data, ps);
1073
1074         set_alternate_index_output(stash_index_path.buf);
1075         if (reset_tree(&info->i_tree, 0, 0)) {
1076                 ret = -1;
1077                 goto done;
1078         }
1079         set_alternate_index_output(NULL);
1080
1081         rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
1082         rev.diffopt.format_callback = add_diff_to_buf;
1083         rev.diffopt.format_callback_data = &diff_output;
1084
1085         if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
1086                 ret = -1;
1087                 goto done;
1088         }
1089
1090         add_pending_object(&rev, parse_object(the_repository, &info->b_commit),
1091                            "");
1092         if (run_diff_index(&rev, 0)) {
1093                 ret = -1;
1094                 goto done;
1095         }
1096
1097         cp_upd_index.git_cmd = 1;
1098         argv_array_pushl(&cp_upd_index.args, "update-index",
1099                          "--ignore-skip-worktree-entries",
1100                          "-z", "--add", "--remove", "--stdin", NULL);
1101         argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
1102                          stash_index_path.buf);
1103
1104         if (pipe_command(&cp_upd_index, diff_output.buf, diff_output.len,
1105                          NULL, 0, NULL, 0)) {
1106                 ret = -1;
1107                 goto done;
1108         }
1109
1110         if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
1111                                 NULL)) {
1112                 ret = -1;
1113                 goto done;
1114         }
1115
1116 done:
1117         discard_index(&istate);
1118         UNLEAK(rev);
1119         object_array_clear(&rev.pending);
1120         clear_pathspec(&rev.prune_data);
1121         strbuf_release(&diff_output);
1122         remove_path(stash_index_path.buf);
1123         return ret;
1124 }
1125
1126 static int do_create_stash(const struct pathspec *ps, struct strbuf *stash_msg_buf,
1127                            int include_untracked, int patch_mode,
1128                            struct stash_info *info, struct strbuf *patch,
1129                            int quiet)
1130 {
1131         int ret = 0;
1132         int flags = 0;
1133         int untracked_commit_option = 0;
1134         const char *head_short_sha1 = NULL;
1135         const char *branch_ref = NULL;
1136         const char *branch_name = "(no branch)";
1137         struct commit *head_commit = NULL;
1138         struct commit_list *parents = NULL;
1139         struct strbuf msg = STRBUF_INIT;
1140         struct strbuf commit_tree_label = STRBUF_INIT;
1141         struct strbuf untracked_files = STRBUF_INIT;
1142
1143         prepare_fallback_ident("git stash", "git@stash");
1144
1145         read_cache_preload(NULL);
1146         if (refresh_and_write_cache(REFRESH_QUIET, 0, 0) < 0) {
1147                 ret = -1;
1148                 goto done;
1149         }
1150
1151         if (get_oid("HEAD", &info->b_commit)) {
1152                 if (!quiet)
1153                         fprintf_ln(stderr, _("You do not have "
1154                                              "the initial commit yet"));
1155                 ret = -1;
1156                 goto done;
1157         } else {
1158                 head_commit = lookup_commit(the_repository, &info->b_commit);
1159         }
1160
1161         if (!check_changes(ps, include_untracked, &untracked_files)) {
1162                 ret = 1;
1163                 goto done;
1164         }
1165
1166         branch_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flags);
1167         if (flags & REF_ISSYMREF)
1168                 branch_name = strrchr(branch_ref, '/') + 1;
1169         head_short_sha1 = find_unique_abbrev(&head_commit->object.oid,
1170                                              DEFAULT_ABBREV);
1171         strbuf_addf(&msg, "%s: %s ", branch_name, head_short_sha1);
1172         pp_commit_easy(CMIT_FMT_ONELINE, head_commit, &msg);
1173
1174         strbuf_addf(&commit_tree_label, "index on %s\n", msg.buf);
1175         commit_list_insert(head_commit, &parents);
1176         if (write_cache_as_tree(&info->i_tree, 0, NULL) ||
1177             commit_tree(commit_tree_label.buf, commit_tree_label.len,
1178                         &info->i_tree, parents, &info->i_commit, NULL, NULL)) {
1179                 if (!quiet)
1180                         fprintf_ln(stderr, _("Cannot save the current "
1181                                              "index state"));
1182                 ret = -1;
1183                 goto done;
1184         }
1185
1186         if (include_untracked) {
1187                 if (save_untracked_files(info, &msg, untracked_files)) {
1188                         if (!quiet)
1189                                 fprintf_ln(stderr, _("Cannot save "
1190                                                      "the untracked files"));
1191                         ret = -1;
1192                         goto done;
1193                 }
1194                 untracked_commit_option = 1;
1195         }
1196         if (patch_mode) {
1197                 ret = stash_patch(info, ps, patch, quiet);
1198                 if (ret < 0) {
1199                         if (!quiet)
1200                                 fprintf_ln(stderr, _("Cannot save the current "
1201                                                      "worktree state"));
1202                         goto done;
1203                 } else if (ret > 0) {
1204                         goto done;
1205                 }
1206         } else {
1207                 if (stash_working_tree(info, ps)) {
1208                         if (!quiet)
1209                                 fprintf_ln(stderr, _("Cannot save the current "
1210                                                      "worktree state"));
1211                         ret = -1;
1212                         goto done;
1213                 }
1214         }
1215
1216         if (!stash_msg_buf->len)
1217                 strbuf_addf(stash_msg_buf, "WIP on %s", msg.buf);
1218         else
1219                 strbuf_insertf(stash_msg_buf, 0, "On %s: ", branch_name);
1220
1221         /*
1222          * `parents` will be empty after calling `commit_tree()`, so there is
1223          * no need to call `free_commit_list()`
1224          */
1225         parents = NULL;
1226         if (untracked_commit_option)
1227                 commit_list_insert(lookup_commit(the_repository,
1228                                                  &info->u_commit),
1229                                    &parents);
1230         commit_list_insert(lookup_commit(the_repository, &info->i_commit),
1231                            &parents);
1232         commit_list_insert(head_commit, &parents);
1233
1234         if (commit_tree(stash_msg_buf->buf, stash_msg_buf->len, &info->w_tree,
1235                         parents, &info->w_commit, NULL, NULL)) {
1236                 if (!quiet)
1237                         fprintf_ln(stderr, _("Cannot record "
1238                                              "working tree state"));
1239                 ret = -1;
1240                 goto done;
1241         }
1242
1243 done:
1244         strbuf_release(&commit_tree_label);
1245         strbuf_release(&msg);
1246         strbuf_release(&untracked_files);
1247         return ret;
1248 }
1249
1250 static int create_stash(int argc, const char **argv, const char *prefix)
1251 {
1252         int ret = 0;
1253         struct strbuf stash_msg_buf = STRBUF_INIT;
1254         struct stash_info info;
1255         struct pathspec ps;
1256
1257         /* Starting with argv[1], since argv[0] is "create" */
1258         strbuf_join_argv(&stash_msg_buf, argc - 1, ++argv, ' ');
1259
1260         memset(&ps, 0, sizeof(ps));
1261         if (!check_changes_tracked_files(&ps))
1262                 return 0;
1263
1264         ret = do_create_stash(&ps, &stash_msg_buf, 0, 0, &info,
1265                               NULL, 0);
1266         if (!ret)
1267                 printf_ln("%s", oid_to_hex(&info.w_commit));
1268
1269         strbuf_release(&stash_msg_buf);
1270         return ret;
1271 }
1272
1273 static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int quiet,
1274                          int keep_index, int patch_mode, int include_untracked)
1275 {
1276         int ret = 0;
1277         struct stash_info info;
1278         struct strbuf patch = STRBUF_INIT;
1279         struct strbuf stash_msg_buf = STRBUF_INIT;
1280         struct strbuf untracked_files = STRBUF_INIT;
1281
1282         if (patch_mode && keep_index == -1)
1283                 keep_index = 1;
1284
1285         if (patch_mode && include_untracked) {
1286                 fprintf_ln(stderr, _("Can't use --patch and --include-untracked"
1287                                      " or --all at the same time"));
1288                 ret = -1;
1289                 goto done;
1290         }
1291
1292         read_cache_preload(NULL);
1293         if (!include_untracked && ps->nr) {
1294                 int i;
1295                 char *ps_matched = xcalloc(ps->nr, 1);
1296
1297                 for (i = 0; i < active_nr; i++)
1298                         ce_path_match(&the_index, active_cache[i], ps,
1299                                       ps_matched);
1300
1301                 if (report_path_error(ps_matched, ps)) {
1302                         fprintf_ln(stderr, _("Did you forget to 'git add'?"));
1303                         ret = -1;
1304                         free(ps_matched);
1305                         goto done;
1306                 }
1307                 free(ps_matched);
1308         }
1309
1310         if (refresh_and_write_cache(REFRESH_QUIET, 0, 0)) {
1311                 ret = -1;
1312                 goto done;
1313         }
1314
1315         if (!check_changes(ps, include_untracked, &untracked_files)) {
1316                 if (!quiet)
1317                         printf_ln(_("No local changes to save"));
1318                 goto done;
1319         }
1320
1321         if (!reflog_exists(ref_stash) && do_clear_stash()) {
1322                 ret = -1;
1323                 if (!quiet)
1324                         fprintf_ln(stderr, _("Cannot initialize stash"));
1325                 goto done;
1326         }
1327
1328         if (stash_msg)
1329                 strbuf_addstr(&stash_msg_buf, stash_msg);
1330         if (do_create_stash(ps, &stash_msg_buf, include_untracked, patch_mode,
1331                             &info, &patch, quiet)) {
1332                 ret = -1;
1333                 goto done;
1334         }
1335
1336         if (do_store_stash(&info.w_commit, stash_msg_buf.buf, 1)) {
1337                 ret = -1;
1338                 if (!quiet)
1339                         fprintf_ln(stderr, _("Cannot save the current status"));
1340                 goto done;
1341         }
1342
1343         if (!quiet)
1344                 printf_ln(_("Saved working directory and index state %s"),
1345                           stash_msg_buf.buf);
1346
1347         if (!patch_mode) {
1348                 if (include_untracked && !ps->nr) {
1349                         struct child_process cp = CHILD_PROCESS_INIT;
1350
1351                         cp.git_cmd = 1;
1352                         argv_array_pushl(&cp.args, "clean", "--force",
1353                                          "--quiet", "-d", NULL);
1354                         if (include_untracked == INCLUDE_ALL_FILES)
1355                                 argv_array_push(&cp.args, "-x");
1356                         if (run_command(&cp)) {
1357                                 ret = -1;
1358                                 goto done;
1359                         }
1360                 }
1361                 discard_cache();
1362                 if (ps->nr) {
1363                         struct child_process cp_add = CHILD_PROCESS_INIT;
1364                         struct child_process cp_diff = CHILD_PROCESS_INIT;
1365                         struct child_process cp_apply = CHILD_PROCESS_INIT;
1366                         struct strbuf out = STRBUF_INIT;
1367
1368                         cp_add.git_cmd = 1;
1369                         argv_array_push(&cp_add.args, "add");
1370                         if (!include_untracked)
1371                                 argv_array_push(&cp_add.args, "-u");
1372                         if (include_untracked == INCLUDE_ALL_FILES)
1373                                 argv_array_push(&cp_add.args, "--force");
1374                         argv_array_push(&cp_add.args, "--");
1375                         add_pathspecs(&cp_add.args, ps);
1376                         if (run_command(&cp_add)) {
1377                                 ret = -1;
1378                                 goto done;
1379                         }
1380
1381                         cp_diff.git_cmd = 1;
1382                         argv_array_pushl(&cp_diff.args, "diff-index", "-p",
1383                                          "--cached", "--binary", "HEAD", "--",
1384                                          NULL);
1385                         add_pathspecs(&cp_diff.args, ps);
1386                         if (pipe_command(&cp_diff, NULL, 0, &out, 0, NULL, 0)) {
1387                                 ret = -1;
1388                                 goto done;
1389                         }
1390
1391                         cp_apply.git_cmd = 1;
1392                         argv_array_pushl(&cp_apply.args, "apply", "--index",
1393                                          "-R", NULL);
1394                         if (pipe_command(&cp_apply, out.buf, out.len, NULL, 0,
1395                                          NULL, 0)) {
1396                                 ret = -1;
1397                                 goto done;
1398                         }
1399                 } else {
1400                         struct child_process cp = CHILD_PROCESS_INIT;
1401                         cp.git_cmd = 1;
1402                         argv_array_pushl(&cp.args, "reset", "--hard", "-q",
1403                                          "--no-recurse-submodules", NULL);
1404                         if (run_command(&cp)) {
1405                                 ret = -1;
1406                                 goto done;
1407                         }
1408                 }
1409
1410                 if (keep_index == 1 && !is_null_oid(&info.i_tree)) {
1411                         struct child_process cp = CHILD_PROCESS_INIT;
1412
1413                         cp.git_cmd = 1;
1414                         argv_array_pushl(&cp.args, "checkout", "--no-overlay",
1415                                          oid_to_hex(&info.i_tree), "--", NULL);
1416                         if (!ps->nr)
1417                                 argv_array_push(&cp.args, ":/");
1418                         else
1419                                 add_pathspecs(&cp.args, ps);
1420                         if (run_command(&cp)) {
1421                                 ret = -1;
1422                                 goto done;
1423                         }
1424                 }
1425                 goto done;
1426         } else {
1427                 struct child_process cp = CHILD_PROCESS_INIT;
1428
1429                 cp.git_cmd = 1;
1430                 argv_array_pushl(&cp.args, "apply", "-R", NULL);
1431
1432                 if (pipe_command(&cp, patch.buf, patch.len, NULL, 0, NULL, 0)) {
1433                         if (!quiet)
1434                                 fprintf_ln(stderr, _("Cannot remove "
1435                                                      "worktree changes"));
1436                         ret = -1;
1437                         goto done;
1438                 }
1439
1440                 if (keep_index < 1) {
1441                         struct child_process cp = CHILD_PROCESS_INIT;
1442
1443                         cp.git_cmd = 1;
1444                         argv_array_pushl(&cp.args, "reset", "-q", "--", NULL);
1445                         add_pathspecs(&cp.args, ps);
1446                         if (run_command(&cp)) {
1447                                 ret = -1;
1448                                 goto done;
1449                         }
1450                 }
1451                 goto done;
1452         }
1453
1454 done:
1455         strbuf_release(&stash_msg_buf);
1456         return ret;
1457 }
1458
1459 static int push_stash(int argc, const char **argv, const char *prefix,
1460                       int push_assumed)
1461 {
1462         int force_assume = 0;
1463         int keep_index = -1;
1464         int patch_mode = 0;
1465         int include_untracked = 0;
1466         int quiet = 0;
1467         int pathspec_file_nul = 0;
1468         const char *stash_msg = NULL;
1469         const char *pathspec_from_file = NULL;
1470         struct pathspec ps;
1471         struct option options[] = {
1472                 OPT_BOOL('k', "keep-index", &keep_index,
1473                          N_("keep index")),
1474                 OPT_BOOL('p', "patch", &patch_mode,
1475                          N_("stash in patch mode")),
1476                 OPT__QUIET(&quiet, N_("quiet mode")),
1477                 OPT_BOOL('u', "include-untracked", &include_untracked,
1478                          N_("include untracked files in stash")),
1479                 OPT_SET_INT('a', "all", &include_untracked,
1480                             N_("include ignore files"), 2),
1481                 OPT_STRING('m', "message", &stash_msg, N_("message"),
1482                            N_("stash message")),
1483                 OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
1484                 OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
1485                 OPT_END()
1486         };
1487
1488         if (argc) {
1489                 force_assume = !strcmp(argv[0], "-p");
1490                 argc = parse_options(argc, argv, prefix, options,
1491                                      git_stash_push_usage,
1492                                      PARSE_OPT_KEEP_DASHDASH);
1493         }
1494
1495         if (argc) {
1496                 if (!strcmp(argv[0], "--")) {
1497                         argc--;
1498                         argv++;
1499                 } else if (push_assumed && !force_assume) {
1500                         die("subcommand wasn't specified; 'push' can't be assumed due to unexpected token '%s'",
1501                             argv[0]);
1502                 }
1503         }
1504
1505         parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL | PATHSPEC_PREFIX_ORIGIN,
1506                        prefix, argv);
1507
1508         if (pathspec_from_file) {
1509                 if (patch_mode)
1510                         die(_("--pathspec-from-file is incompatible with --patch"));
1511
1512                 if (ps.nr)
1513                         die(_("--pathspec-from-file is incompatible with pathspec arguments"));
1514
1515                 parse_pathspec_file(&ps, 0,
1516                                     PATHSPEC_PREFER_FULL | PATHSPEC_PREFIX_ORIGIN,
1517                                     prefix, pathspec_from_file, pathspec_file_nul);
1518         } else if (pathspec_file_nul) {
1519                 die(_("--pathspec-file-nul requires --pathspec-from-file"));
1520         }
1521
1522         return do_push_stash(&ps, stash_msg, quiet, keep_index, patch_mode,
1523                              include_untracked);
1524 }
1525
1526 static int save_stash(int argc, const char **argv, const char *prefix)
1527 {
1528         int keep_index = -1;
1529         int patch_mode = 0;
1530         int include_untracked = 0;
1531         int quiet = 0;
1532         int ret = 0;
1533         const char *stash_msg = NULL;
1534         struct pathspec ps;
1535         struct strbuf stash_msg_buf = STRBUF_INIT;
1536         struct option options[] = {
1537                 OPT_BOOL('k', "keep-index", &keep_index,
1538                          N_("keep index")),
1539                 OPT_BOOL('p', "patch", &patch_mode,
1540                          N_("stash in patch mode")),
1541                 OPT__QUIET(&quiet, N_("quiet mode")),
1542                 OPT_BOOL('u', "include-untracked", &include_untracked,
1543                          N_("include untracked files in stash")),
1544                 OPT_SET_INT('a', "all", &include_untracked,
1545                             N_("include ignore files"), 2),
1546                 OPT_STRING('m', "message", &stash_msg, "message",
1547                            N_("stash message")),
1548                 OPT_END()
1549         };
1550
1551         argc = parse_options(argc, argv, prefix, options,
1552                              git_stash_save_usage,
1553                              PARSE_OPT_KEEP_DASHDASH);
1554
1555         if (argc)
1556                 stash_msg = strbuf_join_argv(&stash_msg_buf, argc, argv, ' ');
1557
1558         memset(&ps, 0, sizeof(ps));
1559         ret = do_push_stash(&ps, stash_msg, quiet, keep_index,
1560                             patch_mode, include_untracked);
1561
1562         strbuf_release(&stash_msg_buf);
1563         return ret;
1564 }
1565
1566 int cmd_stash(int argc, const char **argv, const char *prefix)
1567 {
1568         pid_t pid = getpid();
1569         const char *index_file;
1570         struct argv_array args = ARGV_ARRAY_INIT;
1571
1572         struct option options[] = {
1573                 OPT_END()
1574         };
1575
1576         git_config(git_stash_config, NULL);
1577
1578         if (use_legacy_stash ||
1579             !git_env_bool("GIT_TEST_STASH_USE_BUILTIN", -1))
1580                 warning(_("the stash.useBuiltin support has been removed!\n"
1581                           "See its entry in 'git help config' for details."));
1582
1583         argc = parse_options(argc, argv, prefix, options, git_stash_usage,
1584                              PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
1585
1586         index_file = get_index_file();
1587         strbuf_addf(&stash_index_path, "%s.stash.%" PRIuMAX, index_file,
1588                     (uintmax_t)pid);
1589
1590         if (!argc)
1591                 return !!push_stash(0, NULL, prefix, 0);
1592         else if (!strcmp(argv[0], "apply"))
1593                 return !!apply_stash(argc, argv, prefix);
1594         else if (!strcmp(argv[0], "clear"))
1595                 return !!clear_stash(argc, argv, prefix);
1596         else if (!strcmp(argv[0], "drop"))
1597                 return !!drop_stash(argc, argv, prefix);
1598         else if (!strcmp(argv[0], "pop"))
1599                 return !!pop_stash(argc, argv, prefix);
1600         else if (!strcmp(argv[0], "branch"))
1601                 return !!branch_stash(argc, argv, prefix);
1602         else if (!strcmp(argv[0], "list"))
1603                 return !!list_stash(argc, argv, prefix);
1604         else if (!strcmp(argv[0], "show"))
1605                 return !!show_stash(argc, argv, prefix);
1606         else if (!strcmp(argv[0], "store"))
1607                 return !!store_stash(argc, argv, prefix);
1608         else if (!strcmp(argv[0], "create"))
1609                 return !!create_stash(argc, argv, prefix);
1610         else if (!strcmp(argv[0], "push"))
1611                 return !!push_stash(argc, argv, prefix, 0);
1612         else if (!strcmp(argv[0], "save"))
1613                 return !!save_stash(argc, argv, prefix);
1614         else if (*argv[0] != '-')
1615                 usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
1616                               git_stash_usage, options);
1617
1618         /* Assume 'stash push' */
1619         argv_array_push(&args, "push");
1620         argv_array_pushv(&args, argv);
1621         return !!push_stash(args.argc, args.argv, prefix, 1);
1622 }