git.oblomov.eu Git - git/blob - 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>...]]"),
  31         N_("git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  32            "          [-u|--include-untracked] [-a|--all] [<message>]"),
  33         NULL
  34 };
  35
  36 static const char * const git_stash_list_usage[] = {
  37         N_("git stash list [<options>]"),
  38         NULL
  39 };
  40
  41 static const char * const git_stash_show_usage[] = {
  42         N_("git stash show [<options>] [<stash>]"),
  43         NULL
  44 };
  45
  46 static const char * const git_stash_drop_usage[] = {
  47         N_("git stash drop [-q|--quiet] [<stash>]"),
  48         NULL
  49 };
  50
  51 static const char * const git_stash_pop_usage[] = {
  52         N_("git stash pop [--index] [-q|--quiet] [<stash>]"),
  53         NULL
  54 };
  55
  56 static const char * const git_stash_apply_usage[] = {
  57         N_("git stash apply [--index] [-q|--quiet] [<stash>]"),
  58         NULL
  59 };
  60
  61 static const char * const git_stash_branch_usage[] = {
  62         N_("git stash branch <branchname> [<stash>]"),
  63         NULL
  64 };
  65
  66 static const char * const git_stash_clear_usage[] = {
  67         N_("git stash clear"),
  68         NULL
  69 };
  70
  71 static const char * const git_stash_store_usage[] = {
  72         N_("git stash store [-m|--message <message>] [-q|--quiet] <commit>"),
  73         NULL
  74 };
  75
  76 static const char * const git_stash_push_usage[] = {
  77         N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  78            "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
  79            "          [--] [<pathspec>...]]"),
  80         NULL
  81 };
  82
  83 static const char * const git_stash_save_usage[] = {
  84         N_("git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
  85            "          [-u|--include-untracked] [-a|--all] [<message>]"),
  86         NULL
  87 };
  88
  89 static const char *ref_stash = "refs/stash";
  90 static struct strbuf stash_index_path = STRBUF_INIT;
  91
  92 /*
  93  * w_commit is set to the commit containing the working tree
  94  * b_commit is set to the base commit
  95  * i_commit is set to the commit containing the index tree
  96  * u_commit is set to the commit containing the untracked files tree
  97  * w_tree is set to the working tree
  98  * b_tree is set to the base tree
  99  * i_tree is set to the index tree
 100  * u_tree is set to the untracked files tree
 101  */
 102 struct stash_info {
 103         struct object_id w_commit;
 104         struct object_id b_commit;
 105         struct object_id i_commit;
 106         struct object_id u_commit;
 107         struct object_id w_tree;
 108         struct object_id b_tree;
 109         struct object_id i_tree;
 110         struct object_id u_tree;
 111         struct strbuf revision;
 112         int is_stash_ref;
 113         int has_u;
 114 };
 115
 116 static void free_stash_info(struct stash_info *info)
 117 {
 118         strbuf_release(&info->revision);
 119 }
 120
 121 static void assert_stash_like(struct stash_info *info, const char *revision)
 122 {
 123         if (get_oidf(&info->b_commit, "%s^1", revision) ||
 124             get_oidf(&info->w_tree, "%s:", revision) ||
 125             get_oidf(&info->b_tree, "%s^1:", revision) ||
 126             get_oidf(&info->i_tree, "%s^2:", revision))
 127                 die(_("'%s' is not a stash-like commit"), revision);
 128 }
 129
 130 static int get_stash_info(struct stash_info *info, int argc, const char **argv)
 131 {
 132         int ret;
 133         char *end_of_rev;
 134         char *expanded_ref;
 135         const char *revision;
 136         const char *commit = NULL;
 137         struct object_id dummy;
 138         struct strbuf symbolic = STRBUF_INIT;
 139
 140         if (argc > 1) {
 141                 int i;
 142                 struct strbuf refs_msg = STRBUF_INIT;
 143
 144                 for (i = 0; i < argc; i++)
 145                         strbuf_addf(&refs_msg, " '%s'", argv[i]);
 146
 147                 fprintf_ln(stderr, _("Too many revisions specified:%s"),
 148                            refs_msg.buf);
 149                 strbuf_release(&refs_msg);
 150
 151                 return -1;
 152         }
 153
 154         if (argc == 1)
 155                 commit = argv[0];
 156
 157         strbuf_init(&info->revision, 0);
 158         if (!commit) {
 159                 if (!ref_exists(ref_stash)) {
 160                         free_stash_info(info);
 161                         fprintf_ln(stderr, _("No stash entries found."));
 162                         return -1;
 163                 }
 164
 165                 strbuf_addf(&info->revision, "%s@{0}", ref_stash);
 166         } else if (strspn(commit, "0123456789") == strlen(commit)) {
 167                 strbuf_addf(&info->revision, "%s@{%s}", ref_stash, commit);
 168         } else {
 169                 strbuf_addstr(&info->revision, commit);
 170         }
 171
 172         revision = info->revision.buf;
 173
 174         if (get_oid(revision, &info->w_commit)) {
 175                 error(_("%s is not a valid reference"), revision);
 176                 free_stash_info(info);
 177                 return -1;
 178         }
 179
 180         assert_stash_like(info, revision);
 181
 182         info->has_u = !get_oidf(&info->u_tree, "%s^3:", revision);
 183
 184         end_of_rev = strchrnul(revision, '@');
 185         strbuf_add(&symbolic, revision, end_of_rev - revision);
 186
 187         ret = dwim_ref(symbolic.buf, symbolic.len, &dummy, &expanded_ref);
 188         strbuf_release(&symbolic);
 189         switch (ret) {
 190         case 0: /* Not found, but valid ref */
 191                 info->is_stash_ref = 0;
 192                 break;
 193         case 1:
 194                 info->is_stash_ref = !strcmp(expanded_ref, ref_stash);
 195                 break;
 196         default: /* Invalid or ambiguous */
 197                 free_stash_info(info);
 198         }
 199
 200         free(expanded_ref);
 201         return !(ret == 0 || ret == 1);
 202 }
 203
 204 static int do_clear_stash(void)
 205 {
 206         struct object_id obj;
 207         if (get_oid(ref_stash, &obj))
 208                 return 0;
 209
 210         return delete_ref(NULL, ref_stash, &obj, 0);
 211 }
 212
 213 static int clear_stash(int argc, const char **argv, const char *prefix)
 214 {
 215         struct option options[] = {
 216                 OPT_END()
 217         };
 218
 219         argc = parse_options(argc, argv, prefix, options,
 220                              git_stash_clear_usage,
 221                              PARSE_OPT_STOP_AT_NON_OPTION);
 222
 223         if (argc)
 224                 return error(_("git stash clear with parameters is "
 225                                "unimplemented"));
 226
 227         return do_clear_stash();
 228 }
 229
 230 static int reset_tree(struct object_id *i_tree, int update, int reset)
 231 {
 232         int nr_trees = 1;
 233         struct unpack_trees_options opts;
 234         struct tree_desc t[MAX_UNPACK_TREES];
 235         struct tree *tree;
 236         struct lock_file lock_file = LOCK_INIT;
 237
 238         read_cache_preload(NULL);
 239         if (refresh_cache(REFRESH_QUIET))
 240                 return -1;
 241
 242         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 243
 244         memset(&opts, 0, sizeof(opts));
 245
 246         tree = parse_tree_indirect(i_tree);
 247         if (parse_tree(tree))
 248                 return -1;
 249
 250         init_tree_desc(t, tree->buffer, tree->size);
 251
 252         opts.head_idx = 1;
 253         opts.src_index = &the_index;
 254         opts.dst_index = &the_index;
 255         opts.merge = 1;
 256         opts.reset = reset;
 257         opts.update = update;
 258         opts.fn = oneway_merge;
 259
 260         if (unpack_trees(nr_trees, t, &opts))
 261                 return -1;
 262
 263         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 264                 return error(_("unable to write new index file"));
 265
 266         return 0;
 267 }
 268
 269 static int diff_tree_binary(struct strbuf *out, struct object_id *w_commit)
 270 {
 271         struct child_process cp = CHILD_PROCESS_INIT;
 272         const char *w_commit_hex = oid_to_hex(w_commit);
 273
 274         /*
 275          * Diff-tree would not be very hard to replace with a native function,
 276          * however it should be done together with apply_cached.
 277          */
 278         cp.git_cmd = 1;
 279         argv_array_pushl(&cp.args, "diff-tree", "--binary", NULL);
 280         argv_array_pushf(&cp.args, "%s^2^..%s^2", w_commit_hex, w_commit_hex);
 281
 282         return pipe_command(&cp, NULL, 0, out, 0, NULL, 0);
 283 }
 284
 285 static int apply_cached(struct strbuf *out)
 286 {
 287         struct child_process cp = CHILD_PROCESS_INIT;
 288
 289         /*
 290          * Apply currently only reads either from stdin or a file, thus
 291          * apply_all_patches would have to be updated to optionally take a
 292          * buffer.
 293          */
 294         cp.git_cmd = 1;
 295         argv_array_pushl(&cp.args, "apply", "--cached", NULL);
 296         return pipe_command(&cp, out->buf, out->len, NULL, 0, NULL, 0);
 297 }
 298
 299 static int reset_head(void)
 300 {
 301         struct child_process cp = CHILD_PROCESS_INIT;
 302
 303         /*
 304          * Reset is overall quite simple, however there is no current public
 305          * API for resetting.
 306          */
 307         cp.git_cmd = 1;
 308         argv_array_push(&cp.args, "reset");
 309
 310         return run_command(&cp);
 311 }
 312
 313 static void add_diff_to_buf(struct diff_queue_struct *q,
 314                             struct diff_options *options,
 315                             void *data)
 316 {
 317         int i;
 318
 319         for (i = 0; i < q->nr; i++) {
 320                 strbuf_addstr(data, q->queue[i]->one->path);
 321
 322                 /* NUL-terminate: will be fed to update-index -z */
 323                 strbuf_addch(data, '\0');
 324         }
 325 }
 326
 327 static int get_newly_staged(struct strbuf *out, struct object_id *c_tree)
 328 {
 329         struct child_process cp = CHILD_PROCESS_INIT;
 330         const char *c_tree_hex = oid_to_hex(c_tree);
 331
 332         /*
 333          * diff-index is very similar to diff-tree above, and should be
 334          * converted together with update_index.
 335          */
 336         cp.git_cmd = 1;
 337         argv_array_pushl(&cp.args, "diff-index", "--cached", "--name-only",
 338                          "--diff-filter=A", NULL);
 339         argv_array_push(&cp.args, c_tree_hex);
 340         return pipe_command(&cp, NULL, 0, out, 0, NULL, 0);
 341 }
 342
 343 static int update_index(struct strbuf *out)
 344 {
 345         struct child_process cp = CHILD_PROCESS_INIT;
 346
 347         /*
 348          * Update-index is very complicated and may need to have a public
 349          * function exposed in order to remove this forking.
 350          */
 351         cp.git_cmd = 1;
 352         argv_array_pushl(&cp.args, "update-index", "--add", "--stdin", NULL);
 353         return pipe_command(&cp, out->buf, out->len, NULL, 0, NULL, 0);
 354 }
 355
 356 static int restore_untracked(struct object_id *u_tree)
 357 {
 358         int res;
 359         struct child_process cp = CHILD_PROCESS_INIT;
 360
 361         /*
 362          * We need to run restore files from a given index, but without
 363          * affecting the current index, so we use GIT_INDEX_FILE with
 364          * run_command to fork processes that will not interfere.
 365          */
 366         cp.git_cmd = 1;
 367         argv_array_push(&cp.args, "read-tree");
 368         argv_array_push(&cp.args, oid_to_hex(u_tree));
 369         argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s",
 370                          stash_index_path.buf);
 371         if (run_command(&cp)) {
 372                 remove_path(stash_index_path.buf);
 373                 return -1;
 374         }
 375
 376         child_process_init(&cp);
 377         cp.git_cmd = 1;
 378         argv_array_pushl(&cp.args, "checkout-index", "--all", NULL);
 379         argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s",
 380                          stash_index_path.buf);
 381
 382         res = run_command(&cp);
 383         remove_path(stash_index_path.buf);
 384         return res;
 385 }
 386
 387 static int do_apply_stash(const char *prefix, struct stash_info *info,
 388                           int index, int quiet)
 389 {
 390         int ret;
 391         int has_index = index;
 392         struct merge_options o;
 393         struct object_id c_tree;
 394         struct object_id index_tree;
 395         struct commit *result;
 396         const struct object_id *bases[1];
 397
 398         read_cache_preload(NULL);
 399         if (refresh_cache(REFRESH_QUIET))
 400                 return -1;
 401
 402         if (write_cache_as_tree(&c_tree, 0, NULL))
 403                 return error(_("cannot apply a stash in the middle of a merge"));
 404
 405         if (index) {
 406                 if (oideq(&info->b_tree, &info->i_tree) ||
 407                     oideq(&c_tree, &info->i_tree)) {
 408                         has_index = 0;
 409                 } else {
 410                         struct strbuf out = STRBUF_INIT;
 411
 412                         if (diff_tree_binary(&out, &info->w_commit)) {
 413                                 strbuf_release(&out);
 414                                 return error(_("could not generate diff %s^!."),
 415                                              oid_to_hex(&info->w_commit));
 416                         }
 417
 418                         ret = apply_cached(&out);
 419                         strbuf_release(&out);
 420                         if (ret)
 421                                 return error(_("conflicts in index."
 422                                                "Try without --index."));
 423
 424                         discard_cache();
 425                         read_cache();
 426                         if (write_cache_as_tree(&index_tree, 0, NULL))
 427                                 return error(_("could not save index tree"));
 428
 429                         reset_head();
 430                 }
 431         }
 432
 433         if (info->has_u && restore_untracked(&info->u_tree))
 434                 return error(_("could not restore untracked files from stash"));
 435
 436         init_merge_options(&o, the_repository);
 437
 438         o.branch1 = "Updated upstream";
 439         o.branch2 = "Stashed changes";
 440
 441         if (oideq(&info->b_tree, &c_tree))
 442                 o.branch1 = "Version stash was based on";
 443
 444         if (quiet)
 445                 o.verbosity = 0;
 446
 447         if (o.verbosity >= 3)
 448                 printf_ln(_("Merging %s with %s"), o.branch1, o.branch2);
 449
 450         bases[0] = &info->b_tree;
 451
 452         ret = merge_recursive_generic(&o, &c_tree, &info->w_tree, 1, bases,
 453                                       &result);
 454         if (ret) {
 455                 rerere(0);
 456
 457                 if (index)
 458                         fprintf_ln(stderr, _("Index was not unstashed."));
 459
 460                 return ret;
 461         }
 462
 463         if (has_index) {
 464                 if (reset_tree(&index_tree, 0, 0))
 465                         return -1;
 466         } else {
 467                 struct strbuf out = STRBUF_INIT;
 468
 469                 if (get_newly_staged(&out, &c_tree)) {
 470                         strbuf_release(&out);
 471                         return -1;
 472                 }
 473
 474                 if (reset_tree(&c_tree, 0, 1)) {
 475                         strbuf_release(&out);
 476                         return -1;
 477                 }
 478
 479                 ret = update_index(&out);
 480                 strbuf_release(&out);
 481                 if (ret)
 482                         return -1;
 483
 484                 discard_cache();
 485         }
 486
 487         if (quiet) {
 488                 if (refresh_cache(REFRESH_QUIET))
 489                         warning("could not refresh index");
 490         } else {
 491                 struct child_process cp = CHILD_PROCESS_INIT;
 492
 493                 /*
 494                  * Status is quite simple and could be replaced with calls to
 495                  * wt_status in the future, but it adds complexities which may
 496                  * require more tests.
 497                  */
 498                 cp.git_cmd = 1;
 499                 cp.dir = prefix;
 500                 argv_array_push(&cp.args, "status");
 501                 run_command(&cp);
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int apply_stash(int argc, const char **argv, const char *prefix)
 508 {
 509         int ret;
 510         int quiet = 0;
 511         int index = 0;
 512         struct stash_info info;
 513         struct option options[] = {
 514                 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 515                 OPT_BOOL(0, "index", &index,
 516                          N_("attempt to recreate the index")),
 517                 OPT_END()
 518         };
 519
 520         argc = parse_options(argc, argv, prefix, options,
 521                              git_stash_apply_usage, 0);
 522
 523         if (get_stash_info(&info, argc, argv))
 524                 return -1;
 525
 526         ret = do_apply_stash(prefix, &info, index, quiet);
 527         free_stash_info(&info);
 528         return ret;
 529 }
 530
 531 static int do_drop_stash(struct stash_info *info, int quiet)
 532 {
 533         int ret;
 534         struct child_process cp_reflog = CHILD_PROCESS_INIT;
 535         struct child_process cp = CHILD_PROCESS_INIT;
 536
 537         /*
 538          * reflog does not provide a simple function for deleting refs. One will
 539          * need to be added to avoid implementing too much reflog code here
 540          */
 541
 542         cp_reflog.git_cmd = 1;
 543         argv_array_pushl(&cp_reflog.args, "reflog", "delete", "--updateref",
 544                          "--rewrite", NULL);
 545         argv_array_push(&cp_reflog.args, info->revision.buf);
 546         ret = run_command(&cp_reflog);
 547         if (!ret) {
 548                 if (!quiet)
 549                         printf_ln(_("Dropped %s (%s)"), info->revision.buf,
 550                                   oid_to_hex(&info->w_commit));
 551         } else {
 552                 return error(_("%s: Could not drop stash entry"),
 553                              info->revision.buf);
 554         }
 555
 556         /*
 557          * This could easily be replaced by get_oid, but currently it will throw
 558          * a fatal error when a reflog is empty, which we can not recover from.
 559          */
 560         cp.git_cmd = 1;
 561         /* Even though --quiet is specified, rev-parse still outputs the hash */
 562         cp.no_stdout = 1;
 563         argv_array_pushl(&cp.args, "rev-parse", "--verify", "--quiet", NULL);
 564         argv_array_pushf(&cp.args, "%s@{0}", ref_stash);
 565         ret = run_command(&cp);
 566
 567         /* do_clear_stash if we just dropped the last stash entry */
 568         if (ret)
 569                 do_clear_stash();
 570
 571         return 0;
 572 }
 573
 574 static void assert_stash_ref(struct stash_info *info)
 575 {
 576         if (!info->is_stash_ref) {
 577                 error(_("'%s' is not a stash reference"), info->revision.buf);
 578                 free_stash_info(info);
 579                 exit(1);
 580         }
 581 }
 582
 583 static int drop_stash(int argc, const char **argv, const char *prefix)
 584 {
 585         int ret;
 586         int quiet = 0;
 587         struct stash_info info;
 588         struct option options[] = {
 589                 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 590                 OPT_END()
 591         };
 592
 593         argc = parse_options(argc, argv, prefix, options,
 594                              git_stash_drop_usage, 0);
 595
 596         if (get_stash_info(&info, argc, argv))
 597                 return -1;
 598
 599         assert_stash_ref(&info);
 600
 601         ret = do_drop_stash(&info, quiet);
 602         free_stash_info(&info);
 603         return ret;
 604 }
 605
 606 static int pop_stash(int argc, const char **argv, const char *prefix)
 607 {
 608         int ret;
 609         int index = 0;
 610         int quiet = 0;
 611         struct stash_info info;
 612         struct option options[] = {
 613                 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 614                 OPT_BOOL(0, "index", &index,
 615                          N_("attempt to recreate the index")),
 616                 OPT_END()
 617         };
 618
 619         argc = parse_options(argc, argv, prefix, options,
 620                              git_stash_pop_usage, 0);
 621
 622         if (get_stash_info(&info, argc, argv))
 623                 return -1;
 624
 625         assert_stash_ref(&info);
 626         if ((ret = do_apply_stash(prefix, &info, index, quiet)))
 627                 printf_ln(_("The stash entry is kept in case "
 628                             "you need it again."));
 629         else
 630                 ret = do_drop_stash(&info, quiet);
 631
 632         free_stash_info(&info);
 633         return ret;
 634 }
 635
 636 static int branch_stash(int argc, const char **argv, const char *prefix)
 637 {
 638         int ret;
 639         const char *branch = NULL;
 640         struct stash_info info;
 641         struct child_process cp = CHILD_PROCESS_INIT;
 642         struct option options[] = {
 643                 OPT_END()
 644         };
 645
 646         argc = parse_options(argc, argv, prefix, options,
 647                              git_stash_branch_usage, 0);
 648
 649         if (!argc) {
 650                 fprintf_ln(stderr, _("No branch name specified"));
 651                 return -1;
 652         }
 653
 654         branch = argv[0];
 655
 656         if (get_stash_info(&info, argc - 1, argv + 1))
 657                 return -1;
 658
 659         cp.git_cmd = 1;
 660         argv_array_pushl(&cp.args, "checkout", "-b", NULL);
 661         argv_array_push(&cp.args, branch);
 662         argv_array_push(&cp.args, oid_to_hex(&info.b_commit));
 663         ret = run_command(&cp);
 664         if (!ret)
 665                 ret = do_apply_stash(prefix, &info, 1, 0);
 666         if (!ret && info.is_stash_ref)
 667                 ret = do_drop_stash(&info, 0);
 668
 669         free_stash_info(&info);
 670
 671         return ret;
 672 }
 673
 674 static int list_stash(int argc, const char **argv, const char *prefix)
 675 {
 676         struct child_process cp = CHILD_PROCESS_INIT;
 677         struct option options[] = {
 678                 OPT_END()
 679         };
 680
 681         argc = parse_options(argc, argv, prefix, options,
 682                              git_stash_list_usage,
 683                              PARSE_OPT_KEEP_UNKNOWN);
 684
 685         if (!ref_exists(ref_stash))
 686                 return 0;
 687
 688         cp.git_cmd = 1;
 689         argv_array_pushl(&cp.args, "log", "--format=%gd: %gs", "-g",
 690                          "--first-parent", "-m", NULL);
 691         argv_array_pushv(&cp.args, argv);
 692         argv_array_push(&cp.args, ref_stash);
 693         argv_array_push(&cp.args, "--");
 694         return run_command(&cp);
 695 }
 696
 697 static int show_stat = 1;
 698 static int show_patch;
 699
 700 static int git_stash_config(const char *var, const char *value, void *cb)
 701 {
 702         if (!strcmp(var, "stash.showstat")) {
 703                 show_stat = git_config_bool(var, value);
 704                 return 0;
 705         }
 706         if (!strcmp(var, "stash.showpatch")) {
 707                 show_patch = git_config_bool(var, value);
 708                 return 0;
 709         }
 710         return git_default_config(var, value, cb);
 711 }
 712
 713 static int show_stash(int argc, const char **argv, const char *prefix)
 714 {
 715         int i;
 716         int opts = 0;
 717         int ret = 0;
 718         struct stash_info info;
 719         struct rev_info rev;
 720         struct argv_array stash_args = ARGV_ARRAY_INIT;
 721         struct option options[] = {
 722                 OPT_END()
 723         };
 724
 725         init_diff_ui_defaults();
 726         git_config(git_diff_ui_config, NULL);
 727         init_revisions(&rev, prefix);
 728
 729         for (i = 1; i < argc; i++) {
 730                 if (argv[i][0] != '-')
 731                         argv_array_push(&stash_args, argv[i]);
 732                 else
 733                         opts++;
 734         }
 735
 736         ret = get_stash_info(&info, stash_args.argc, stash_args.argv);
 737         argv_array_clear(&stash_args);
 738         if (ret)
 739                 return -1;
 740
 741         /*
 742          * The config settings are applied only if there are not passed
 743          * any options.
 744          */
 745         if (!opts) {
 746                 git_config(git_stash_config, NULL);
 747                 if (show_stat)
 748                         rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT;
 749
 750                 if (show_patch)
 751                         rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
 752
 753                 if (!show_stat && !show_patch) {
 754                         free_stash_info(&info);
 755                         return 0;
 756                 }
 757         }
 758
 759         argc = setup_revisions(argc, argv, &rev, NULL);
 760         if (argc > 1) {
 761                 free_stash_info(&info);
 762                 usage_with_options(git_stash_show_usage, options);
 763         }
 764         if (!rev.diffopt.output_format) {
 765                 rev.diffopt.output_format = DIFF_FORMAT_PATCH;
 766                 diff_setup_done(&rev.diffopt);
 767         }
 768
 769         rev.diffopt.flags.recursive = 1;
 770         setup_diff_pager(&rev.diffopt);
 771         diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt);
 772         log_tree_diff_flush(&rev);
 773
 774         free_stash_info(&info);
 775         return diff_result_code(&rev.diffopt, 0);
 776 }
 777
 778 static int do_store_stash(const struct object_id *w_commit, const char *stash_msg,
 779                           int quiet)
 780 {
 781         if (!stash_msg)
 782                 stash_msg = "Created via \"git stash store\".";
 783
 784         if (update_ref(stash_msg, ref_stash, w_commit, NULL,
 785                        REF_FORCE_CREATE_REFLOG,
 786                        quiet ? UPDATE_REFS_QUIET_ON_ERR :
 787                        UPDATE_REFS_MSG_ON_ERR)) {
 788                 if (!quiet) {
 789                         fprintf_ln(stderr, _("Cannot update %s with %s"),
 790                                    ref_stash, oid_to_hex(w_commit));
 791                 }
 792                 return -1;
 793         }
 794
 795         return 0;
 796 }
 797
 798 static int store_stash(int argc, const char **argv, const char *prefix)
 799 {
 800         int quiet = 0;
 801         const char *stash_msg = NULL;
 802         struct object_id obj;
 803         struct object_context dummy;
 804         struct option options[] = {
 805                 OPT__QUIET(&quiet, N_("be quiet")),
 806                 OPT_STRING('m', "message", &stash_msg, "message",
 807                            N_("stash message")),
 808                 OPT_END()
 809         };
 810
 811         argc = parse_options(argc, argv, prefix, options,
 812                              git_stash_store_usage,
 813                              PARSE_OPT_KEEP_UNKNOWN);
 814
 815         if (argc != 1) {
 816                 if (!quiet)
 817                         fprintf_ln(stderr, _("\"git stash store\" requires one "
 818                                              "<commit> argument"));
 819                 return -1;
 820         }
 821
 822         if (get_oid_with_context(the_repository,
 823                                  argv[0], quiet ? GET_OID_QUIETLY : 0, &obj,
 824                                  &dummy)) {
 825                 if (!quiet)
 826                         fprintf_ln(stderr, _("Cannot update %s with %s"),
 827                                              ref_stash, argv[0]);
 828                 return -1;
 829         }
 830
 831         return do_store_stash(&obj, stash_msg, quiet);
 832 }
 833
 834 static void add_pathspecs(struct argv_array *args,
 835                           const struct pathspec *ps) {
 836         int i;
 837
 838         for (i = 0; i < ps->nr; i++)
 839                 argv_array_push(args, ps->items[i].original);
 840 }
 841
 842 /*
 843  * `untracked_files` will be filled with the names of untracked files.
 844  * The return value is:
 845  *
 846  * = 0 if there are not any untracked files
 847  * > 0 if there are untracked files
 848  */
 849 static int get_untracked_files(const struct pathspec *ps, int include_untracked,
 850                                struct strbuf *untracked_files)
 851 {
 852         int i;
 853         int max_len;
 854         int found = 0;
 855         char *seen;
 856         struct dir_struct dir;
 857
 858         memset(&dir, 0, sizeof(dir));
 859         if (include_untracked != INCLUDE_ALL_FILES)
 860                 setup_standard_excludes(&dir);
 861
 862         seen = xcalloc(ps->nr, 1);
 863
 864         max_len = fill_directory(&dir, the_repository->index, ps);
 865         for (i = 0; i < dir.nr; i++) {
 866                 struct dir_entry *ent = dir.entries[i];
 867                 if (dir_path_match(&the_index, ent, ps, max_len, seen)) {
 868                         found++;
 869                         strbuf_addstr(untracked_files, ent->name);
 870                         /* NUL-terminate: will be fed to update-index -z */
 871                         strbuf_addch(untracked_files, '\0');
 872                 }
 873                 free(ent);
 874         }
 875
 876         free(seen);
 877         free(dir.entries);
 878         free(dir.ignored);
 879         clear_directory(&dir);
 880         return found;
 881 }
 882
 883 /*
 884  * The return value of `check_changes_tracked_files()` can be:
 885  *
 886  * < 0 if there was an error
 887  * = 0 if there are no changes.
 888  * > 0 if there are changes.
 889  */
 890 static int check_changes_tracked_files(const struct pathspec *ps)
 891 {
 892         int result;
 893         struct rev_info rev;
 894         struct object_id dummy;
 895         int ret = 0;
 896
 897         /* No initial commit. */
 898         if (get_oid("HEAD", &dummy))
 899                 return -1;
 900
 901         if (read_cache() < 0)
 902                 return -1;
 903
 904         init_revisions(&rev, NULL);
 905         copy_pathspec(&rev.prune_data, ps);
 906
 907         rev.diffopt.flags.quick = 1;
 908         rev.diffopt.flags.ignore_submodules = 1;
 909         rev.abbrev = 0;
 910
 911         add_head_to_pending(&rev);
 912         diff_setup_done(&rev.diffopt);
 913
 914         result = run_diff_index(&rev, 1);
 915         if (diff_result_code(&rev.diffopt, result)) {
 916                 ret = 1;
 917                 goto done;
 918         }
 919
 920         object_array_clear(&rev.pending);
 921         result = run_diff_files(&rev, 0);
 922         if (diff_result_code(&rev.diffopt, result)) {
 923                 ret = 1;
 924                 goto done;
 925         }
 926
 927 done:
 928         clear_pathspec(&rev.prune_data);
 929         return ret;
 930 }
 931
 932 /*
 933  * The function will fill `untracked_files` with the names of untracked files
 934  * It will return 1 if there were any changes and 0 if there were not.
 935  */
 936 static int check_changes(const struct pathspec *ps, int include_untracked,
 937                          struct strbuf *untracked_files)
 938 {
 939         int ret = 0;
 940         if (check_changes_tracked_files(ps))
 941                 ret = 1;
 942
 943         if (include_untracked && get_untracked_files(ps, include_untracked,
 944                                                      untracked_files))
 945                 ret = 1;
 946
 947         return ret;
 948 }
 949
 950 static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 951                                 struct strbuf files)
 952 {
 953         int ret = 0;
 954         struct strbuf untracked_msg = STRBUF_INIT;
 955         struct child_process cp_upd_index = CHILD_PROCESS_INIT;
 956         struct index_state istate = { NULL };
 957
 958         cp_upd_index.git_cmd = 1;
 959         argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
 960                          "--remove", "--stdin", NULL);
 961         argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
 962                          stash_index_path.buf);
 963
 964         strbuf_addf(&untracked_msg, "untracked files on %s\n", msg->buf);
 965         if (pipe_command(&cp_upd_index, files.buf, files.len, NULL, 0,
 966                          NULL, 0)) {
 967                 ret = -1;
 968                 goto done;
 969         }
 970
 971         if (write_index_as_tree(&info->u_tree, &istate, stash_index_path.buf, 0,
 972                                 NULL)) {
 973                 ret = -1;
 974                 goto done;
 975         }
 976
 977         if (commit_tree(untracked_msg.buf, untracked_msg.len,
 978                         &info->u_tree, NULL, &info->u_commit, NULL, NULL)) {
 979                 ret = -1;
 980                 goto done;
 981         }
 982
 983 done:
 984         discard_index(&istate);
 985         strbuf_release(&untracked_msg);
 986         remove_path(stash_index_path.buf);
 987         return ret;
 988 }
 989
 990 static int stash_patch(struct stash_info *info, const struct pathspec *ps,
 991                        struct strbuf *out_patch, int quiet)
 992 {
 993         int ret = 0;
 994         struct child_process cp_read_tree = CHILD_PROCESS_INIT;
 995         struct child_process cp_add_i = CHILD_PROCESS_INIT;
 996         struct child_process cp_diff_tree = CHILD_PROCESS_INIT;
 997         struct index_state istate = { NULL };
 998
 999         remove_path(stash_index_path.buf);
1000
1001         cp_read_tree.git_cmd = 1;
1002         argv_array_pushl(&cp_read_tree.args, "read-tree", "HEAD", NULL);
1003         argv_array_pushf(&cp_read_tree.env_array, "GIT_INDEX_FILE=%s",
1004                          stash_index_path.buf);
1005         if (run_command(&cp_read_tree)) {
1006                 ret = -1;
1007                 goto done;
1008         }
1009
1010         /* Find out what the user wants. */
1011         cp_add_i.git_cmd = 1;
1012         argv_array_pushl(&cp_add_i.args, "add--interactive", "--patch=stash",
1013                          "--", NULL);
1014         add_pathspecs(&cp_add_i.args, ps);
1015         argv_array_pushf(&cp_add_i.env_array, "GIT_INDEX_FILE=%s",
1016                          stash_index_path.buf);
1017         if (run_command(&cp_add_i)) {
1018                 ret = -1;
1019                 goto done;
1020         }
1021
1022         /* State of the working tree. */
1023         if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
1024                                 NULL)) {
1025                 ret = -1;
1026                 goto done;
1027         }
1028
1029         cp_diff_tree.git_cmd = 1;
1030         argv_array_pushl(&cp_diff_tree.args, "diff-tree", "-p", "HEAD",
1031                          oid_to_hex(&info->w_tree), "--", NULL);
1032         if (pipe_command(&cp_diff_tree, NULL, 0, out_patch, 0, NULL, 0)) {
1033                 ret = -1;
1034                 goto done;
1035         }
1036
1037         if (!out_patch->len) {
1038                 if (!quiet)
1039                         fprintf_ln(stderr, _("No changes selected"));
1040                 ret = 1;
1041         }
1042
1043 done:
1044         discard_index(&istate);
1045         remove_path(stash_index_path.buf);
1046         return ret;
1047 }
1048
1049 static int stash_working_tree(struct stash_info *info, const struct pathspec *ps)
1050 {
1051         int ret = 0;
1052         struct rev_info rev;
1053         struct child_process cp_upd_index = CHILD_PROCESS_INIT;
1054         struct strbuf diff_output = STRBUF_INIT;
1055         struct index_state istate = { NULL };
1056
1057         init_revisions(&rev, NULL);
1058         copy_pathspec(&rev.prune_data, ps);
1059
1060         set_alternate_index_output(stash_index_path.buf);
1061         if (reset_tree(&info->i_tree, 0, 0)) {
1062                 ret = -1;
1063                 goto done;
1064         }
1065         set_alternate_index_output(NULL);
1066
1067         rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
1068         rev.diffopt.format_callback = add_diff_to_buf;
1069         rev.diffopt.format_callback_data = &diff_output;
1070
1071         if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
1072                 ret = -1;
1073                 goto done;
1074         }
1075
1076         add_pending_object(&rev, parse_object(the_repository, &info->b_commit),
1077                            "");
1078         if (run_diff_index(&rev, 0)) {
1079                 ret = -1;
1080                 goto done;
1081         }
1082
1083         cp_upd_index.git_cmd = 1;
1084         argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
1085                          "--remove", "--stdin", NULL);
1086         argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
1087                          stash_index_path.buf);
1088
1089         if (pipe_command(&cp_upd_index, diff_output.buf, diff_output.len,
1090                          NULL, 0, NULL, 0)) {
1091                 ret = -1;
1092                 goto done;
1093         }
1094
1095         if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
1096                                 NULL)) {
1097                 ret = -1;
1098                 goto done;
1099         }
1100
1101 done:
1102         discard_index(&istate);
1103         UNLEAK(rev);
1104         object_array_clear(&rev.pending);
1105         clear_pathspec(&rev.prune_data);
1106         strbuf_release(&diff_output);
1107         remove_path(stash_index_path.buf);
1108         return ret;
1109 }
1110
1111 static int do_create_stash(const struct pathspec *ps, struct strbuf *stash_msg_buf,
1112                            int include_untracked, int patch_mode,
1113                            struct stash_info *info, struct strbuf *patch,
1114                            int quiet)
1115 {
1116         int ret = 0;
1117         int flags = 0;
1118         int untracked_commit_option = 0;
1119         const char *head_short_sha1 = NULL;
1120         const char *branch_ref = NULL;
1121         const char *branch_name = "(no branch)";
1122         struct commit *head_commit = NULL;
1123         struct commit_list *parents = NULL;
1124         struct strbuf msg = STRBUF_INIT;
1125         struct strbuf commit_tree_label = STRBUF_INIT;
1126         struct strbuf untracked_files = STRBUF_INIT;
1127
1128         prepare_fallback_ident("git stash", "git@stash");
1129
1130         read_cache_preload(NULL);
1131         refresh_cache(REFRESH_QUIET);
1132
1133         if (get_oid("HEAD", &info->b_commit)) {
1134                 if (!quiet)
1135                         fprintf_ln(stderr, _("You do not have "
1136                                              "the initial commit yet"));
1137                 ret = -1;
1138                 goto done;
1139         } else {
1140                 head_commit = lookup_commit(the_repository, &info->b_commit);
1141         }
1142
1143         if (!check_changes(ps, include_untracked, &untracked_files)) {
1144                 ret = 1;
1145                 goto done;
1146         }
1147
1148         branch_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flags);
1149         if (flags & REF_ISSYMREF)
1150                 branch_name = strrchr(branch_ref, '/') + 1;
1151         head_short_sha1 = find_unique_abbrev(&head_commit->object.oid,
1152                                              DEFAULT_ABBREV);
1153         strbuf_addf(&msg, "%s: %s ", branch_name, head_short_sha1);
1154         pp_commit_easy(CMIT_FMT_ONELINE, head_commit, &msg);
1155
1156         strbuf_addf(&commit_tree_label, "index on %s\n", msg.buf);
1157         commit_list_insert(head_commit, &parents);
1158         if (write_cache_as_tree(&info->i_tree, 0, NULL) ||
1159             commit_tree(commit_tree_label.buf, commit_tree_label.len,
1160                         &info->i_tree, parents, &info->i_commit, NULL, NULL)) {
1161                 if (!quiet)
1162                         fprintf_ln(stderr, _("Cannot save the current "
1163                                              "index state"));
1164                 ret = -1;
1165                 goto done;
1166         }
1167
1168         if (include_untracked) {
1169                 if (save_untracked_files(info, &msg, untracked_files)) {
1170                         if (!quiet)
1171                                 fprintf_ln(stderr, _("Cannot save "
1172                                                      "the untracked files"));
1173                         ret = -1;
1174                         goto done;
1175                 }
1176                 untracked_commit_option = 1;
1177         }
1178         if (patch_mode) {
1179                 ret = stash_patch(info, ps, patch, quiet);
1180                 if (ret < 0) {
1181                         if (!quiet)
1182                                 fprintf_ln(stderr, _("Cannot save the current "
1183                                                      "worktree state"));
1184                         goto done;
1185                 } else if (ret > 0) {
1186                         goto done;
1187                 }
1188         } else {
1189                 if (stash_working_tree(info, ps)) {
1190                         if (!quiet)
1191                                 fprintf_ln(stderr, _("Cannot save the current "
1192                                                      "worktree state"));
1193                         ret = -1;
1194                         goto done;
1195                 }
1196         }
1197
1198         if (!stash_msg_buf->len)
1199                 strbuf_addf(stash_msg_buf, "WIP on %s", msg.buf);
1200         else
1201                 strbuf_insertf(stash_msg_buf, 0, "On %s: ", branch_name);
1202
1203         /*
1204          * `parents` will be empty after calling `commit_tree()`, so there is
1205          * no need to call `free_commit_list()`
1206          */
1207         parents = NULL;
1208         if (untracked_commit_option)
1209                 commit_list_insert(lookup_commit(the_repository,
1210                                                  &info->u_commit),
1211                                    &parents);
1212         commit_list_insert(lookup_commit(the_repository, &info->i_commit),
1213                            &parents);
1214         commit_list_insert(head_commit, &parents);
1215
1216         if (commit_tree(stash_msg_buf->buf, stash_msg_buf->len, &info->w_tree,
1217                         parents, &info->w_commit, NULL, NULL)) {
1218                 if (!quiet)
1219                         fprintf_ln(stderr, _("Cannot record "
1220                                              "working tree state"));
1221                 ret = -1;
1222                 goto done;
1223         }
1224
1225 done:
1226         strbuf_release(&commit_tree_label);
1227         strbuf_release(&msg);
1228         strbuf_release(&untracked_files);
1229         return ret;
1230 }
1231
1232 static int create_stash(int argc, const char **argv, const char *prefix)
1233 {
1234         int ret = 0;
1235         struct strbuf stash_msg_buf = STRBUF_INIT;
1236         struct stash_info info;
1237         struct pathspec ps;
1238
1239         /* Starting with argv[1], since argv[0] is "create" */
1240         strbuf_join_argv(&stash_msg_buf, argc - 1, ++argv, ' ');
1241
1242         memset(&ps, 0, sizeof(ps));
1243         if (!check_changes_tracked_files(&ps))
1244                 return 0;
1245
1246         ret = do_create_stash(&ps, &stash_msg_buf, 0, 0, &info,
1247                               NULL, 0);
1248         if (!ret)
1249                 printf_ln("%s", oid_to_hex(&info.w_commit));
1250
1251         strbuf_release(&stash_msg_buf);
1252         return ret;
1253 }
1254
1255 static int do_push_stash(const struct pathspec *ps, const char *stash_msg, int quiet,
1256                          int keep_index, int patch_mode, int include_untracked)
1257 {
1258         int ret = 0;
1259         struct stash_info info;
1260         struct strbuf patch = STRBUF_INIT;
1261         struct strbuf stash_msg_buf = STRBUF_INIT;
1262         struct strbuf untracked_files = STRBUF_INIT;
1263
1264         if (patch_mode && keep_index == -1)
1265                 keep_index = 1;
1266
1267         if (patch_mode && include_untracked) {
1268                 fprintf_ln(stderr, _("Can't use --patch and --include-untracked"
1269                                      " or --all at the same time"));
1270                 ret = -1;
1271                 goto done;
1272         }
1273
1274         read_cache_preload(NULL);
1275         if (!include_untracked && ps->nr) {
1276                 int i;
1277                 char *ps_matched = xcalloc(ps->nr, 1);
1278
1279                 for (i = 0; i < active_nr; i++)
1280                         ce_path_match(&the_index, active_cache[i], ps,
1281                                       ps_matched);
1282
1283                 if (report_path_error(ps_matched, ps)) {
1284                         fprintf_ln(stderr, _("Did you forget to 'git add'?"));
1285                         ret = -1;
1286                         free(ps_matched);
1287                         goto done;
1288                 }
1289                 free(ps_matched);
1290         }
1291
1292         if (refresh_cache(REFRESH_QUIET)) {
1293                 ret = -1;
1294                 goto done;
1295         }
1296
1297         if (!check_changes(ps, include_untracked, &untracked_files)) {
1298                 if (!quiet)
1299                         printf_ln(_("No local changes to save"));
1300                 goto done;
1301         }
1302
1303         if (!reflog_exists(ref_stash) && do_clear_stash()) {
1304                 ret = -1;
1305                 if (!quiet)
1306                         fprintf_ln(stderr, _("Cannot initialize stash"));
1307                 goto done;
1308         }
1309
1310         if (stash_msg)
1311                 strbuf_addstr(&stash_msg_buf, stash_msg);
1312         if (do_create_stash(ps, &stash_msg_buf, include_untracked, patch_mode,
1313                             &info, &patch, quiet)) {
1314                 ret = -1;
1315                 goto done;
1316         }
1317
1318         if (do_store_stash(&info.w_commit, stash_msg_buf.buf, 1)) {
1319                 ret = -1;
1320                 if (!quiet)
1321                         fprintf_ln(stderr, _("Cannot save the current status"));
1322                 goto done;
1323         }
1324
1325         if (!quiet)
1326                 printf_ln(_("Saved working directory and index state %s"),
1327                           stash_msg_buf.buf);
1328
1329         if (!patch_mode) {
1330                 if (include_untracked && !ps->nr) {
1331                         struct child_process cp = CHILD_PROCESS_INIT;
1332
1333                         cp.git_cmd = 1;
1334                         argv_array_pushl(&cp.args, "clean", "--force",
1335                                          "--quiet", "-d", NULL);
1336                         if (include_untracked == INCLUDE_ALL_FILES)
1337                                 argv_array_push(&cp.args, "-x");
1338                         if (run_command(&cp)) {
1339                                 ret = -1;
1340                                 goto done;
1341                         }
1342                 }
1343                 discard_cache();
1344                 if (ps->nr) {
1345                         struct child_process cp_add = CHILD_PROCESS_INIT;
1346                         struct child_process cp_diff = CHILD_PROCESS_INIT;
1347                         struct child_process cp_apply = CHILD_PROCESS_INIT;
1348                         struct strbuf out = STRBUF_INIT;
1349
1350                         cp_add.git_cmd = 1;
1351                         argv_array_push(&cp_add.args, "add");
1352                         if (!include_untracked)
1353                                 argv_array_push(&cp_add.args, "-u");
1354                         if (include_untracked == INCLUDE_ALL_FILES)
1355                                 argv_array_push(&cp_add.args, "--force");
1356                         argv_array_push(&cp_add.args, "--");
1357                         add_pathspecs(&cp_add.args, ps);
1358                         if (run_command(&cp_add)) {
1359                                 ret = -1;
1360                                 goto done;
1361                         }
1362
1363                         cp_diff.git_cmd = 1;
1364                         argv_array_pushl(&cp_diff.args, "diff-index", "-p",
1365                                          "--cached", "--binary", "HEAD", "--",
1366                                          NULL);
1367                         add_pathspecs(&cp_diff.args, ps);
1368                         if (pipe_command(&cp_diff, NULL, 0, &out, 0, NULL, 0)) {
1369                                 ret = -1;
1370                                 goto done;
1371                         }
1372
1373                         cp_apply.git_cmd = 1;
1374                         argv_array_pushl(&cp_apply.args, "apply", "--index",
1375                                          "-R", NULL);
1376                         if (pipe_command(&cp_apply, out.buf, out.len, NULL, 0,
1377                                          NULL, 0)) {
1378                                 ret = -1;
1379                                 goto done;
1380                         }
1381                 } else {
1382                         struct child_process cp = CHILD_PROCESS_INIT;
1383                         cp.git_cmd = 1;
1384                         argv_array_pushl(&cp.args, "reset", "--hard", "-q",
1385                                          NULL);
1386                         if (run_command(&cp)) {
1387                                 ret = -1;
1388                                 goto done;
1389                         }
1390                 }
1391
1392                 if (keep_index == 1 && !is_null_oid(&info.i_tree)) {
1393                         struct child_process cp_ls = CHILD_PROCESS_INIT;
1394                         struct child_process cp_checkout = CHILD_PROCESS_INIT;
1395                         struct strbuf out = STRBUF_INIT;
1396
1397                         if (reset_tree(&info.i_tree, 0, 1)) {
1398                                 ret = -1;
1399                                 goto done;
1400                         }
1401
1402                         cp_ls.git_cmd = 1;
1403                         argv_array_pushl(&cp_ls.args, "ls-files", "-z",
1404                                          "--modified", "--", NULL);
1405
1406                         add_pathspecs(&cp_ls.args, ps);
1407                         if (pipe_command(&cp_ls, NULL, 0, &out, 0, NULL, 0)) {
1408                                 ret = -1;
1409                                 goto done;
1410                         }
1411
1412                         cp_checkout.git_cmd = 1;
1413                         argv_array_pushl(&cp_checkout.args, "checkout-index",
1414                                          "-z", "--force", "--stdin", NULL);
1415                         if (pipe_command(&cp_checkout, out.buf, out.len, NULL,
1416                                          0, NULL, 0)) {
1417                                 ret = -1;
1418                                 goto done;
1419                         }
1420                 }
1421                 goto done;
1422         } else {
1423                 struct child_process cp = CHILD_PROCESS_INIT;
1424
1425                 cp.git_cmd = 1;
1426                 argv_array_pushl(&cp.args, "apply", "-R", NULL);
1427
1428                 if (pipe_command(&cp, patch.buf, patch.len, NULL, 0, NULL, 0)) {
1429                         if (!quiet)
1430                                 fprintf_ln(stderr, _("Cannot remove "
1431                                                      "worktree changes"));
1432                         ret = -1;
1433                         goto done;
1434                 }
1435
1436                 if (keep_index < 1) {
1437                         struct child_process cp = CHILD_PROCESS_INIT;
1438
1439                         cp.git_cmd = 1;
1440                         argv_array_pushl(&cp.args, "reset", "-q", "--", NULL);
1441                         add_pathspecs(&cp.args, ps);
1442                         if (run_command(&cp)) {
1443                                 ret = -1;
1444                                 goto done;
1445                         }
1446                 }
1447                 goto done;
1448         }
1449
1450 done:
1451         strbuf_release(&stash_msg_buf);
1452         return ret;
1453 }
1454
1455 static int push_stash(int argc, const char **argv, const char *prefix)
1456 {
1457         int keep_index = -1;
1458         int patch_mode = 0;
1459         int include_untracked = 0;
1460         int quiet = 0;
1461         const char *stash_msg = NULL;
1462         struct pathspec ps;
1463         struct option options[] = {
1464                 OPT_BOOL('k', "keep-index", &keep_index,
1465                          N_("keep index")),
1466                 OPT_BOOL('p', "patch", &patch_mode,
1467                          N_("stash in patch mode")),
1468                 OPT__QUIET(&quiet, N_("quiet mode")),
1469                 OPT_BOOL('u', "include-untracked", &include_untracked,
1470                          N_("include untracked files in stash")),
1471                 OPT_SET_INT('a', "all", &include_untracked,
1472                             N_("include ignore files"), 2),
1473                 OPT_STRING('m', "message", &stash_msg, N_("message"),
1474                            N_("stash message")),
1475                 OPT_END()
1476         };
1477
1478         if (argc)
1479                 argc = parse_options(argc, argv, prefix, options,
1480                                      git_stash_push_usage,
1481                                      0);
1482
1483         parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL | PATHSPEC_PREFIX_ORIGIN,
1484                        prefix, argv);
1485         return do_push_stash(&ps, stash_msg, quiet, keep_index, patch_mode,
1486                              include_untracked);
1487 }
1488
1489 static int save_stash(int argc, const char **argv, const char *prefix)
1490 {
1491         int keep_index = -1;
1492         int patch_mode = 0;
1493         int include_untracked = 0;
1494         int quiet = 0;
1495         int ret = 0;
1496         const char *stash_msg = NULL;
1497         struct pathspec ps;
1498         struct strbuf stash_msg_buf = STRBUF_INIT;
1499         struct option options[] = {
1500                 OPT_BOOL('k', "keep-index", &keep_index,
1501                          N_("keep index")),
1502                 OPT_BOOL('p', "patch", &patch_mode,
1503                          N_("stash in patch mode")),
1504                 OPT__QUIET(&quiet, N_("quiet mode")),
1505                 OPT_BOOL('u', "include-untracked", &include_untracked,
1506                          N_("include untracked files in stash")),
1507                 OPT_SET_INT('a', "all", &include_untracked,
1508                             N_("include ignore files"), 2),
1509                 OPT_STRING('m', "message", &stash_msg, "message",
1510                            N_("stash message")),
1511                 OPT_END()
1512         };
1513
1514         argc = parse_options(argc, argv, prefix, options,
1515                              git_stash_save_usage,
1516                              PARSE_OPT_KEEP_DASHDASH);
1517
1518         if (argc)
1519                 stash_msg = strbuf_join_argv(&stash_msg_buf, argc, argv, ' ');
1520
1521         memset(&ps, 0, sizeof(ps));
1522         ret = do_push_stash(&ps, stash_msg, quiet, keep_index,
1523                             patch_mode, include_untracked);
1524
1525         strbuf_release(&stash_msg_buf);
1526         return ret;
1527 }
1528
1529 static int use_builtin_stash(void)
1530 {
1531         struct child_process cp = CHILD_PROCESS_INIT;
1532         struct strbuf out = STRBUF_INIT;
1533         int ret, env = git_env_bool("GIT_TEST_STASH_USE_BUILTIN", -1);
1534
1535         if (env != -1)
1536                 return env;
1537
1538         argv_array_pushl(&cp.args,
1539                          "config", "--bool", "stash.usebuiltin", NULL);
1540         cp.git_cmd = 1;
1541         if (capture_command(&cp, &out, 6)) {
1542                 strbuf_release(&out);
1543                 return 1;
1544         }
1545
1546         strbuf_trim(&out);
1547         ret = !strcmp("true", out.buf);
1548         strbuf_release(&out);
1549         return ret;
1550 }
1551
1552 int cmd_stash(int argc, const char **argv, const char *prefix)
1553 {
1554         int i = -1;
1555         pid_t pid = getpid();
1556         const char *index_file;
1557         struct argv_array args = ARGV_ARRAY_INIT;
1558
1559         struct option options[] = {
1560                 OPT_END()
1561         };
1562
1563         if (!use_builtin_stash()) {
1564                 const char *path = mkpath("%s/git-legacy-stash",
1565                                           git_exec_path());
1566
1567                 if (sane_execvp(path, (char **)argv) < 0)
1568                         die_errno(_("could not exec %s"), path);
1569                 else
1570                         BUG("sane_execvp() returned???");
1571         }
1572
1573         prefix = setup_git_directory();
1574         trace_repo_setup(prefix);
1575         setup_work_tree();
1576
1577         git_config(git_diff_basic_config, NULL);
1578
1579         argc = parse_options(argc, argv, prefix, options, git_stash_usage,
1580                              PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
1581
1582         index_file = get_index_file();
1583         strbuf_addf(&stash_index_path, "%s.stash.%" PRIuMAX, index_file,
1584                     (uintmax_t)pid);
1585
1586         if (!argc)
1587                 return !!push_stash(0, NULL, prefix);
1588         else if (!strcmp(argv[0], "apply"))
1589                 return !!apply_stash(argc, argv, prefix);
1590         else if (!strcmp(argv[0], "clear"))
1591                 return !!clear_stash(argc, argv, prefix);
1592         else if (!strcmp(argv[0], "drop"))
1593                 return !!drop_stash(argc, argv, prefix);
1594         else if (!strcmp(argv[0], "pop"))
1595                 return !!pop_stash(argc, argv, prefix);
1596         else if (!strcmp(argv[0], "branch"))
1597                 return !!branch_stash(argc, argv, prefix);
1598         else if (!strcmp(argv[0], "list"))
1599                 return !!list_stash(argc, argv, prefix);
1600         else if (!strcmp(argv[0], "show"))
1601                 return !!show_stash(argc, argv, prefix);
1602         else if (!strcmp(argv[0], "store"))
1603                 return !!store_stash(argc, argv, prefix);
1604         else if (!strcmp(argv[0], "create"))
1605                 return !!create_stash(argc, argv, prefix);
1606         else if (!strcmp(argv[0], "push"))
1607                 return !!push_stash(argc, argv, prefix);
1608         else if (!strcmp(argv[0], "save"))
1609                 return !!save_stash(argc, argv, prefix);
1610         else if (*argv[0] != '-')
1611                 usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
1612                               git_stash_usage, options);
1613
1614         if (strcmp(argv[0], "-p")) {
1615                 while (++i < argc && strcmp(argv[i], "--")) {
1616                         /*
1617                          * `akpqu` is a string which contains all short options,
1618                          * except `-m` which is verified separately.
1619                          */
1620                         if ((strlen(argv[i]) == 2) && *argv[i] == '-' &&
1621                             strchr("akpqu", argv[i][1]))
1622                                 continue;
1623
1624                         if (!strcmp(argv[i], "--all") ||
1625                             !strcmp(argv[i], "--keep-index") ||
1626                             !strcmp(argv[i], "--no-keep-index") ||
1627                             !strcmp(argv[i], "--patch") ||
1628                             !strcmp(argv[i], "--quiet") ||
1629                             !strcmp(argv[i], "--include-untracked"))
1630                                 continue;
1631
1632                         /*
1633                          * `-m` and `--message=` are verified separately because
1634                          * they need to be immediately followed by a string
1635                          * (i.e.`-m"foobar"` or `--message="foobar"`).
1636                          */
1637                         if (starts_with(argv[i], "-m") ||
1638                             starts_with(argv[i], "--message="))
1639                                 continue;
1640
1641                         usage_with_options(git_stash_usage, options);
1642                 }
1643         }
1644
1645         argv_array_push(&args, "push");
1646         argv_array_pushv(&args, argv);
1647         return !!push_stash(args.argc, args.argv, prefix);
1648 }