builtin / checkout.con commit Second batch for 2.19 cycle (e333175)
   1#include "builtin.h"
   2#include "config.h"
   3#include "checkout.h"
   4#include "lockfile.h"
   5#include "parse-options.h"
   6#include "refs.h"
   7#include "commit.h"
   8#include "tree.h"
   9#include "tree-walk.h"
  10#include "cache-tree.h"
  11#include "unpack-trees.h"
  12#include "dir.h"
  13#include "run-command.h"
  14#include "merge-recursive.h"
  15#include "branch.h"
  16#include "diff.h"
  17#include "revision.h"
  18#include "remote.h"
  19#include "blob.h"
  20#include "xdiff-interface.h"
  21#include "ll-merge.h"
  22#include "resolve-undo.h"
  23#include "submodule-config.h"
  24#include "submodule.h"
  25
  26static const char * const checkout_usage[] = {
  27        N_("git checkout [<options>] <branch>"),
  28        N_("git checkout [<options>] [<branch>] -- <file>..."),
  29        NULL,
  30};
  31
  32struct checkout_opts {
  33        int patch_mode;
  34        int quiet;
  35        int merge;
  36        int force;
  37        int force_detach;
  38        int writeout_stage;
  39        int overwrite_ignore;
  40        int ignore_skipworktree;
  41        int ignore_other_worktrees;
  42        int show_progress;
  43
  44        const char *new_branch;
  45        const char *new_branch_force;
  46        const char *new_orphan_branch;
  47        int new_branch_log;
  48        enum branch_track track;
  49        struct diff_options diff_options;
  50
  51        int branch_exists;
  52        const char *prefix;
  53        struct pathspec pathspec;
  54        struct tree *source_tree;
  55};
  56
  57static int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
  58                              int changed)
  59{
  60        return run_hook_le(NULL, "post-checkout",
  61                           oid_to_hex(old_commit ? &old_commit->object.oid : &null_oid),
  62                           oid_to_hex(new_commit ? &new_commit->object.oid : &null_oid),
  63                           changed ? "1" : "0", NULL);
  64        /* "new_commit" can be NULL when checking out from the index before
  65           a commit exists. */
  66
  67}
  68
  69static int update_some(const struct object_id *oid, struct strbuf *base,
  70                const char *pathname, unsigned mode, int stage, void *context)
  71{
  72        int len;
  73        struct cache_entry *ce;
  74        int pos;
  75
  76        if (S_ISDIR(mode))
  77                return READ_TREE_RECURSIVE;
  78
  79        len = base->len + strlen(pathname);
  80        ce = xcalloc(1, cache_entry_size(len));
  81        oidcpy(&ce->oid, oid);
  82        memcpy(ce->name, base->buf, base->len);
  83        memcpy(ce->name + base->len, pathname, len - base->len);
  84        ce->ce_flags = create_ce_flags(0) | CE_UPDATE;
  85        ce->ce_namelen = len;
  86        ce->ce_mode = create_ce_mode(mode);
  87
  88        /*
  89         * If the entry is the same as the current index, we can leave the old
  90         * entry in place. Whether it is UPTODATE or not, checkout_entry will
  91         * do the right thing.
  92         */
  93        pos = cache_name_pos(ce->name, ce->ce_namelen);
  94        if (pos >= 0) {
  95                struct cache_entry *old = active_cache[pos];
  96                if (ce->ce_mode == old->ce_mode &&
  97                    !oidcmp(&ce->oid, &old->oid)) {
  98                        old->ce_flags |= CE_UPDATE;
  99                        free(ce);
 100                        return 0;
 101                }
 102        }
 103
 104        add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
 105        return 0;
 106}
 107
 108static int read_tree_some(struct tree *tree, const struct pathspec *pathspec)
 109{
 110        read_tree_recursive(tree, "", 0, 0, pathspec, update_some, NULL);
 111
 112        /* update the index with the given tree's info
 113         * for all args, expanding wildcards, and exit
 114         * with any non-zero return code.
 115         */
 116        return 0;
 117}
 118
 119static int skip_same_name(const struct cache_entry *ce, int pos)
 120{
 121        while (++pos < active_nr &&
 122               !strcmp(active_cache[pos]->name, ce->name))
 123                ; /* skip */
 124        return pos;
 125}
 126
 127static int check_stage(int stage, const struct cache_entry *ce, int pos)
 128{
 129        while (pos < active_nr &&
 130               !strcmp(active_cache[pos]->name, ce->name)) {
 131                if (ce_stage(active_cache[pos]) == stage)
 132                        return 0;
 133                pos++;
 134        }
 135        if (stage == 2)
 136                return error(_("path '%s' does not have our version"), ce->name);
 137        else
 138                return error(_("path '%s' does not have their version"), ce->name);
 139}
 140
 141static int check_stages(unsigned stages, const struct cache_entry *ce, int pos)
 142{
 143        unsigned seen = 0;
 144        const char *name = ce->name;
 145
 146        while (pos < active_nr) {
 147                ce = active_cache[pos];
 148                if (strcmp(name, ce->name))
 149                        break;
 150                seen |= (1 << ce_stage(ce));
 151                pos++;
 152        }
 153        if ((stages & seen) != stages)
 154                return error(_("path '%s' does not have all necessary versions"),
 155                             name);
 156        return 0;
 157}
 158
 159static int checkout_stage(int stage, const struct cache_entry *ce, int pos,
 160                          const struct checkout *state)
 161{
 162        while (pos < active_nr &&
 163               !strcmp(active_cache[pos]->name, ce->name)) {
 164                if (ce_stage(active_cache[pos]) == stage)
 165                        return checkout_entry(active_cache[pos], state, NULL);
 166                pos++;
 167        }
 168        if (stage == 2)
 169                return error(_("path '%s' does not have our version"), ce->name);
 170        else
 171                return error(_("path '%s' does not have their version"), ce->name);
 172}
 173
 174static int checkout_merged(int pos, const struct checkout *state)
 175{
 176        struct cache_entry *ce = active_cache[pos];
 177        const char *path = ce->name;
 178        mmfile_t ancestor, ours, theirs;
 179        int status;
 180        struct object_id oid;
 181        mmbuffer_t result_buf;
 182        struct object_id threeway[3];
 183        unsigned mode = 0;
 184
 185        memset(threeway, 0, sizeof(threeway));
 186        while (pos < active_nr) {
 187                int stage;
 188                stage = ce_stage(ce);
 189                if (!stage || strcmp(path, ce->name))
 190                        break;
 191                oidcpy(&threeway[stage - 1], &ce->oid);
 192                if (stage == 2)
 193                        mode = create_ce_mode(ce->ce_mode);
 194                pos++;
 195                ce = active_cache[pos];
 196        }
 197        if (is_null_oid(&threeway[1]) || is_null_oid(&threeway[2]))
 198                return error(_("path '%s' does not have necessary versions"), path);
 199
 200        read_mmblob(&ancestor, &threeway[0]);
 201        read_mmblob(&ours, &threeway[1]);
 202        read_mmblob(&theirs, &threeway[2]);
 203
 204        /*
 205         * NEEDSWORK: re-create conflicts from merges with
 206         * merge.renormalize set, too
 207         */
 208        status = ll_merge(&result_buf, path, &ancestor, "base",
 209                          &ours, "ours", &theirs, "theirs", NULL);
 210        free(ancestor.ptr);
 211        free(ours.ptr);
 212        free(theirs.ptr);
 213        if (status < 0 || !result_buf.ptr) {
 214                free(result_buf.ptr);
 215                return error(_("path '%s': cannot merge"), path);
 216        }
 217
 218        /*
 219         * NEEDSWORK:
 220         * There is absolutely no reason to write this as a blob object
 221         * and create a phony cache entry.  This hack is primarily to get
 222         * to the write_entry() machinery that massages the contents to
 223         * work-tree format and writes out which only allows it for a
 224         * cache entry.  The code in write_entry() needs to be refactored
 225         * to allow us to feed a <buffer, size, mode> instead of a cache
 226         * entry.  Such a refactoring would help merge_recursive as well
 227         * (it also writes the merge result to the object database even
 228         * when it may contain conflicts).
 229         */
 230        if (write_object_file(result_buf.ptr, result_buf.size, blob_type, &oid))
 231                die(_("Unable to add merge result for '%s'"), path);
 232        free(result_buf.ptr);
 233        ce = make_cache_entry(mode, oid.hash, path, 2, 0);
 234        if (!ce)
 235                die(_("make_cache_entry failed for path '%s'"), path);
 236        status = checkout_entry(ce, state, NULL);
 237        free(ce);
 238        return status;
 239}
 240
 241static int checkout_paths(const struct checkout_opts *opts,
 242                          const char *revision)
 243{
 244        int pos;
 245        struct checkout state = CHECKOUT_INIT;
 246        static char *ps_matched;
 247        struct object_id rev;
 248        struct commit *head;
 249        int errs = 0;
 250        struct lock_file lock_file = LOCK_INIT;
 251
 252        if (opts->track != BRANCH_TRACK_UNSPECIFIED)
 253                die(_("'%s' cannot be used with updating paths"), "--track");
 254
 255        if (opts->new_branch_log)
 256                die(_("'%s' cannot be used with updating paths"), "-l");
 257
 258        if (opts->force && opts->patch_mode)
 259                die(_("'%s' cannot be used with updating paths"), "-f");
 260
 261        if (opts->force_detach)
 262                die(_("'%s' cannot be used with updating paths"), "--detach");
 263
 264        if (opts->merge && opts->patch_mode)
 265                die(_("'%s' cannot be used with %s"), "--merge", "--patch");
 266
 267        if (opts->force && opts->merge)
 268                die(_("'%s' cannot be used with %s"), "-f", "-m");
 269
 270        if (opts->new_branch)
 271                die(_("Cannot update paths and switch to branch '%s' at the same time."),
 272                    opts->new_branch);
 273
 274        if (opts->patch_mode)
 275                return run_add_interactive(revision, "--patch=checkout",
 276                                           &opts->pathspec);
 277
 278        hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 279        if (read_cache_preload(&opts->pathspec) < 0)
 280                return error(_("index file corrupt"));
 281
 282        if (opts->source_tree)
 283                read_tree_some(opts->source_tree, &opts->pathspec);
 284
 285        ps_matched = xcalloc(opts->pathspec.nr, 1);
 286
 287        /*
 288         * Make sure all pathspecs participated in locating the paths
 289         * to be checked out.
 290         */
 291        for (pos = 0; pos < active_nr; pos++) {
 292                struct cache_entry *ce = active_cache[pos];
 293                ce->ce_flags &= ~CE_MATCHED;
 294                if (!opts->ignore_skipworktree && ce_skip_worktree(ce))
 295                        continue;
 296                if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
 297                        /*
 298                         * "git checkout tree-ish -- path", but this entry
 299                         * is in the original index; it will not be checked
 300                         * out to the working tree and it does not matter
 301                         * if pathspec matched this entry.  We will not do
 302                         * anything to this entry at all.
 303                         */
 304                        continue;
 305                /*
 306                 * Either this entry came from the tree-ish we are
 307                 * checking the paths out of, or we are checking out
 308                 * of the index.
 309                 *
 310                 * If it comes from the tree-ish, we already know it
 311                 * matches the pathspec and could just stamp
 312                 * CE_MATCHED to it from update_some(). But we still
 313                 * need ps_matched and read_tree_recursive (and
 314                 * eventually tree_entry_interesting) cannot fill
 315                 * ps_matched yet. Once it can, we can avoid calling
 316                 * match_pathspec() for _all_ entries when
 317                 * opts->source_tree != NULL.
 318                 */
 319                if (ce_path_match(ce, &opts->pathspec, ps_matched))
 320                        ce->ce_flags |= CE_MATCHED;
 321        }
 322
 323        if (report_path_error(ps_matched, &opts->pathspec, opts->prefix)) {
 324                free(ps_matched);
 325                return 1;
 326        }
 327        free(ps_matched);
 328
 329        /* "checkout -m path" to recreate conflicted state */
 330        if (opts->merge)
 331                unmerge_marked_index(&the_index);
 332
 333        /* Any unmerged paths? */
 334        for (pos = 0; pos < active_nr; pos++) {
 335                const struct cache_entry *ce = active_cache[pos];
 336                if (ce->ce_flags & CE_MATCHED) {
 337                        if (!ce_stage(ce))
 338                                continue;
 339                        if (opts->force) {
 340                                warning(_("path '%s' is unmerged"), ce->name);
 341                        } else if (opts->writeout_stage) {
 342                                errs |= check_stage(opts->writeout_stage, ce, pos);
 343                        } else if (opts->merge) {
 344                                errs |= check_stages((1<<2) | (1<<3), ce, pos);
 345                        } else {
 346                                errs = 1;
 347                                error(_("path '%s' is unmerged"), ce->name);
 348                        }
 349                        pos = skip_same_name(ce, pos) - 1;
 350                }
 351        }
 352        if (errs)
 353                return 1;
 354
 355        /* Now we are committed to check them out */
 356        state.force = 1;
 357        state.refresh_cache = 1;
 358        state.istate = &the_index;
 359
 360        enable_delayed_checkout(&state);
 361        for (pos = 0; pos < active_nr; pos++) {
 362                struct cache_entry *ce = active_cache[pos];
 363                if (ce->ce_flags & CE_MATCHED) {
 364                        if (!ce_stage(ce)) {
 365                                errs |= checkout_entry(ce, &state, NULL);
 366                                continue;
 367                        }
 368                        if (opts->writeout_stage)
 369                                errs |= checkout_stage(opts->writeout_stage, ce, pos, &state);
 370                        else if (opts->merge)
 371                                errs |= checkout_merged(pos, &state);
 372                        pos = skip_same_name(ce, pos) - 1;
 373                }
 374        }
 375        errs |= finish_delayed_checkout(&state);
 376
 377        if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 378                die(_("unable to write new index file"));
 379
 380        read_ref_full("HEAD", 0, &rev, NULL);
 381        head = lookup_commit_reference_gently(&rev, 1);
 382
 383        errs |= post_checkout_hook(head, head, 0);
 384        return errs;
 385}
 386
 387static void show_local_changes(struct object *head,
 388                               const struct diff_options *opts)
 389{
 390        struct rev_info rev;
 391        /* I think we want full paths, even if we're in a subdirectory. */
 392        init_revisions(&rev, NULL);
 393        rev.diffopt.flags = opts->flags;
 394        rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
 395        diff_setup_done(&rev.diffopt);
 396        add_pending_object(&rev, head, NULL);
 397        run_diff_index(&rev, 0);
 398}
 399
 400static void describe_detached_head(const char *msg, struct commit *commit)
 401{
 402        struct strbuf sb = STRBUF_INIT;
 403
 404        if (!parse_commit(commit))
 405                pp_commit_easy(CMIT_FMT_ONELINE, commit, &sb);
 406        if (print_sha1_ellipsis()) {
 407                fprintf(stderr, "%s %s... %s\n", msg,
 408                        find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV), sb.buf);
 409        } else {
 410                fprintf(stderr, "%s %s %s\n", msg,
 411                        find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV), sb.buf);
 412        }
 413        strbuf_release(&sb);
 414}
 415
 416static int reset_tree(struct tree *tree, const struct checkout_opts *o,
 417                      int worktree, int *writeout_error)
 418{
 419        struct unpack_trees_options opts;
 420        struct tree_desc tree_desc;
 421
 422        memset(&opts, 0, sizeof(opts));
 423        opts.head_idx = -1;
 424        opts.update = worktree;
 425        opts.skip_unmerged = !worktree;
 426        opts.reset = 1;
 427        opts.merge = 1;
 428        opts.fn = oneway_merge;
 429        opts.verbose_update = o->show_progress;
 430        opts.src_index = &the_index;
 431        opts.dst_index = &the_index;
 432        parse_tree(tree);
 433        init_tree_desc(&tree_desc, tree->buffer, tree->size);
 434        switch (unpack_trees(1, &tree_desc, &opts)) {
 435        case -2:
 436                *writeout_error = 1;
 437                /*
 438                 * We return 0 nevertheless, as the index is all right
 439                 * and more importantly we have made best efforts to
 440                 * update paths in the work tree, and we cannot revert
 441                 * them.
 442                 */
 443                /* fallthrough */
 444        case 0:
 445                return 0;
 446        default:
 447                return 128;
 448        }
 449}
 450
 451struct branch_info {
 452        const char *name; /* The short name used */
 453        const char *path; /* The full name of a real branch */
 454        struct commit *commit; /* The named commit */
 455        /*
 456         * if not null the branch is detached because it's already
 457         * checked out in this checkout
 458         */
 459        char *checkout;
 460};
 461
 462static void setup_branch_path(struct branch_info *branch)
 463{
 464        struct strbuf buf = STRBUF_INIT;
 465
 466        strbuf_branchname(&buf, branch->name, INTERPRET_BRANCH_LOCAL);
 467        if (strcmp(buf.buf, branch->name))
 468                branch->name = xstrdup(buf.buf);
 469        strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
 470        branch->path = strbuf_detach(&buf, NULL);
 471}
 472
 473static int merge_working_tree(const struct checkout_opts *opts,
 474                              struct branch_info *old_branch_info,
 475                              struct branch_info *new_branch_info,
 476                              int *writeout_error)
 477{
 478        int ret;
 479        struct lock_file lock_file = LOCK_INIT;
 480
 481        hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 482        if (read_cache_preload(NULL) < 0)
 483                return error(_("index file corrupt"));
 484
 485        resolve_undo_clear();
 486        if (opts->force) {
 487                ret = reset_tree(get_commit_tree(new_branch_info->commit),
 488                                 opts, 1, writeout_error);
 489                if (ret)
 490                        return ret;
 491        } else {
 492                struct tree_desc trees[2];
 493                struct tree *tree;
 494                struct unpack_trees_options topts;
 495
 496                memset(&topts, 0, sizeof(topts));
 497                topts.head_idx = -1;
 498                topts.src_index = &the_index;
 499                topts.dst_index = &the_index;
 500
 501                setup_unpack_trees_porcelain(&topts, "checkout");
 502
 503                refresh_cache(REFRESH_QUIET);
 504
 505                if (unmerged_cache()) {
 506                        error(_("you need to resolve your current index first"));
 507                        return 1;
 508                }
 509
 510                /* 2-way merge to the new branch */
 511                topts.initial_checkout = is_cache_unborn();
 512                topts.update = 1;
 513                topts.merge = 1;
 514                topts.gently = opts->merge && old_branch_info->commit;
 515                topts.verbose_update = opts->show_progress;
 516                topts.fn = twoway_merge;
 517                if (opts->overwrite_ignore) {
 518                        topts.dir = xcalloc(1, sizeof(*topts.dir));
 519                        topts.dir->flags |= DIR_SHOW_IGNORED;
 520                        setup_standard_excludes(topts.dir);
 521                }
 522                tree = parse_tree_indirect(old_branch_info->commit ?
 523                                           &old_branch_info->commit->object.oid :
 524                                           the_hash_algo->empty_tree);
 525                init_tree_desc(&trees[0], tree->buffer, tree->size);
 526                tree = parse_tree_indirect(&new_branch_info->commit->object.oid);
 527                init_tree_desc(&trees[1], tree->buffer, tree->size);
 528
 529                ret = unpack_trees(2, trees, &topts);
 530                clear_unpack_trees_porcelain(&topts);
 531                if (ret == -1) {
 532                        /*
 533                         * Unpack couldn't do a trivial merge; either
 534                         * give up or do a real merge, depending on
 535                         * whether the merge flag was used.
 536                         */
 537                        struct tree *result;
 538                        struct tree *work;
 539                        struct merge_options o;
 540                        if (!opts->merge)
 541                                return 1;
 542
 543                        /*
 544                         * Without old_branch_info->commit, the below is the same as
 545                         * the two-tree unpack we already tried and failed.
 546                         */
 547                        if (!old_branch_info->commit)
 548                                return 1;
 549
 550                        /* Do more real merge */
 551
 552                        /*
 553                         * We update the index fully, then write the
 554                         * tree from the index, then merge the new
 555                         * branch with the current tree, with the old
 556                         * branch as the base. Then we reset the index
 557                         * (but not the working tree) to the new
 558                         * branch, leaving the working tree as the
 559                         * merged version, but skipping unmerged
 560                         * entries in the index.
 561                         */
 562
 563                        add_files_to_cache(NULL, NULL, 0);
 564                        /*
 565                         * NEEDSWORK: carrying over local changes
 566                         * when branches have different end-of-line
 567                         * normalization (or clean+smudge rules) is
 568                         * a pain; plumb in an option to set
 569                         * o.renormalize?
 570                         */
 571                        init_merge_options(&o);
 572                        o.verbosity = 0;
 573                        work = write_tree_from_memory(&o);
 574
 575                        ret = reset_tree(get_commit_tree(new_branch_info->commit),
 576                                         opts, 1,
 577                                         writeout_error);
 578                        if (ret)
 579                                return ret;
 580                        o.ancestor = old_branch_info->name;
 581                        o.branch1 = new_branch_info->name;
 582                        o.branch2 = "local";
 583                        ret = merge_trees(&o,
 584                                          get_commit_tree(new_branch_info->commit),
 585                                          work,
 586                                          get_commit_tree(old_branch_info->commit),
 587                                          &result);
 588                        if (ret < 0)
 589                                exit(128);
 590                        ret = reset_tree(get_commit_tree(new_branch_info->commit),
 591                                         opts, 0,
 592                                         writeout_error);
 593                        strbuf_release(&o.obuf);
 594                        if (ret)
 595                                return ret;
 596                }
 597        }
 598
 599        if (!active_cache_tree)
 600                active_cache_tree = cache_tree();
 601
 602        if (!cache_tree_fully_valid(active_cache_tree))
 603                cache_tree_update(&the_index, WRITE_TREE_SILENT | WRITE_TREE_REPAIR);
 604
 605        if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 606                die(_("unable to write new index file"));
 607
 608        if (!opts->force && !opts->quiet)
 609                show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
 610
 611        return 0;
 612}
 613
 614static void report_tracking(struct branch_info *new_branch_info)
 615{
 616        struct strbuf sb = STRBUF_INIT;
 617        struct branch *branch = branch_get(new_branch_info->name);
 618
 619        if (!format_tracking_info(branch, &sb, AHEAD_BEHIND_FULL))
 620                return;
 621        fputs(sb.buf, stdout);
 622        strbuf_release(&sb);
 623}
 624
 625static void update_refs_for_switch(const struct checkout_opts *opts,
 626                                   struct branch_info *old_branch_info,
 627                                   struct branch_info *new_branch_info)
 628{
 629        struct strbuf msg = STRBUF_INIT;
 630        const char *old_desc, *reflog_msg;
 631        if (opts->new_branch) {
 632                if (opts->new_orphan_branch) {
 633                        char *refname;
 634
 635                        refname = mkpathdup("refs/heads/%s", opts->new_orphan_branch);
 636                        if (opts->new_branch_log &&
 637                            !should_autocreate_reflog(refname)) {
 638                                int ret;
 639                                struct strbuf err = STRBUF_INIT;
 640
 641                                ret = safe_create_reflog(refname, 1, &err);
 642                                if (ret) {
 643                                        fprintf(stderr, _("Can not do reflog for '%s': %s\n"),
 644                                                opts->new_orphan_branch, err.buf);
 645                                        strbuf_release(&err);
 646                                        free(refname);
 647                                        return;
 648                                }
 649                                strbuf_release(&err);
 650                        }
 651                        free(refname);
 652                }
 653                else
 654                        create_branch(opts->new_branch, new_branch_info->name,
 655                                      opts->new_branch_force ? 1 : 0,
 656                                      opts->new_branch_force ? 1 : 0,
 657                                      opts->new_branch_log,
 658                                      opts->quiet,
 659                                      opts->track);
 660                new_branch_info->name = opts->new_branch;
 661                setup_branch_path(new_branch_info);
 662        }
 663
 664        old_desc = old_branch_info->name;
 665        if (!old_desc && old_branch_info->commit)
 666                old_desc = oid_to_hex(&old_branch_info->commit->object.oid);
 667
 668        reflog_msg = getenv("GIT_REFLOG_ACTION");
 669        if (!reflog_msg)
 670                strbuf_addf(&msg, "checkout: moving from %s to %s",
 671                        old_desc ? old_desc : "(invalid)", new_branch_info->name);
 672        else
 673                strbuf_insert(&msg, 0, reflog_msg, strlen(reflog_msg));
 674
 675        if (!strcmp(new_branch_info->name, "HEAD") && !new_branch_info->path && !opts->force_detach) {
 676                /* Nothing to do. */
 677        } else if (opts->force_detach || !new_branch_info->path) {      /* No longer on any branch. */
 678                update_ref(msg.buf, "HEAD", &new_branch_info->commit->object.oid, NULL,
 679                           REF_NO_DEREF, UPDATE_REFS_DIE_ON_ERR);
 680                if (!opts->quiet) {
 681                        if (old_branch_info->path &&
 682                            advice_detached_head && !opts->force_detach)
 683                                detach_advice(new_branch_info->name);
 684                        describe_detached_head(_("HEAD is now at"), new_branch_info->commit);
 685                }
 686        } else if (new_branch_info->path) {     /* Switch branches. */
 687                if (create_symref("HEAD", new_branch_info->path, msg.buf) < 0)
 688                        die(_("unable to update HEAD"));
 689                if (!opts->quiet) {
 690                        if (old_branch_info->path && !strcmp(new_branch_info->path, old_branch_info->path)) {
 691                                if (opts->new_branch_force)
 692                                        fprintf(stderr, _("Reset branch '%s'\n"),
 693                                                new_branch_info->name);
 694                                else
 695                                        fprintf(stderr, _("Already on '%s'\n"),
 696                                                new_branch_info->name);
 697                        } else if (opts->new_branch) {
 698                                if (opts->branch_exists)
 699                                        fprintf(stderr, _("Switched to and reset branch '%s'\n"), new_branch_info->name);
 700                                else
 701                                        fprintf(stderr, _("Switched to a new branch '%s'\n"), new_branch_info->name);
 702                        } else {
 703                                fprintf(stderr, _("Switched to branch '%s'\n"),
 704                                        new_branch_info->name);
 705                        }
 706                }
 707                if (old_branch_info->path && old_branch_info->name) {
 708                        if (!ref_exists(old_branch_info->path) && reflog_exists(old_branch_info->path))
 709                                delete_reflog(old_branch_info->path);
 710                }
 711        }
 712        remove_branch_state();
 713        strbuf_release(&msg);
 714        if (!opts->quiet &&
 715            (new_branch_info->path || (!opts->force_detach && !strcmp(new_branch_info->name, "HEAD"))))
 716                report_tracking(new_branch_info);
 717}
 718
 719static int add_pending_uninteresting_ref(const char *refname,
 720                                         const struct object_id *oid,
 721                                         int flags, void *cb_data)
 722{
 723        add_pending_oid(cb_data, refname, oid, UNINTERESTING);
 724        return 0;
 725}
 726
 727static void describe_one_orphan(struct strbuf *sb, struct commit *commit)
 728{
 729        strbuf_addstr(sb, "  ");
 730        strbuf_add_unique_abbrev(sb, &commit->object.oid, DEFAULT_ABBREV);
 731        strbuf_addch(sb, ' ');
 732        if (!parse_commit(commit))
 733                pp_commit_easy(CMIT_FMT_ONELINE, commit, sb);
 734        strbuf_addch(sb, '\n');
 735}
 736
 737#define ORPHAN_CUTOFF 4
 738static void suggest_reattach(struct commit *commit, struct rev_info *revs)
 739{
 740        struct commit *c, *last = NULL;
 741        struct strbuf sb = STRBUF_INIT;
 742        int lost = 0;
 743        while ((c = get_revision(revs)) != NULL) {
 744                if (lost < ORPHAN_CUTOFF)
 745                        describe_one_orphan(&sb, c);
 746                last = c;
 747                lost++;
 748        }
 749        if (ORPHAN_CUTOFF < lost) {
 750                int more = lost - ORPHAN_CUTOFF;
 751                if (more == 1)
 752                        describe_one_orphan(&sb, last);
 753                else
 754                        strbuf_addf(&sb, _(" ... and %d more.\n"), more);
 755        }
 756
 757        fprintf(stderr,
 758                Q_(
 759                /* The singular version */
 760                "Warning: you are leaving %d commit behind, "
 761                "not connected to\n"
 762                "any of your branches:\n\n"
 763                "%s\n",
 764                /* The plural version */
 765                "Warning: you are leaving %d commits behind, "
 766                "not connected to\n"
 767                "any of your branches:\n\n"
 768                "%s\n",
 769                /* Give ngettext() the count */
 770                lost),
 771                lost,
 772                sb.buf);
 773        strbuf_release(&sb);
 774
 775        if (advice_detached_head)
 776                fprintf(stderr,
 777                        Q_(
 778                        /* The singular version */
 779                        "If you want to keep it by creating a new branch, "
 780                        "this may be a good time\nto do so with:\n\n"
 781                        " git branch <new-branch-name> %s\n\n",
 782                        /* The plural version */
 783                        "If you want to keep them by creating a new branch, "
 784                        "this may be a good time\nto do so with:\n\n"
 785                        " git branch <new-branch-name> %s\n\n",
 786                        /* Give ngettext() the count */
 787                        lost),
 788                        find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
 789}
 790
 791/*
 792 * We are about to leave commit that was at the tip of a detached
 793 * HEAD.  If it is not reachable from any ref, this is the last chance
 794 * for the user to do so without resorting to reflog.
 795 */
 796static void orphaned_commit_warning(struct commit *old_commit, struct commit *new_commit)
 797{
 798        struct rev_info revs;
 799        struct object *object = &old_commit->object;
 800
 801        init_revisions(&revs, NULL);
 802        setup_revisions(0, NULL, &revs, NULL);
 803
 804        object->flags &= ~UNINTERESTING;
 805        add_pending_object(&revs, object, oid_to_hex(&object->oid));
 806
 807        for_each_ref(add_pending_uninteresting_ref, &revs);
 808        add_pending_oid(&revs, "HEAD", &new_commit->object.oid, UNINTERESTING);
 809
 810        if (prepare_revision_walk(&revs))
 811                die(_("internal error in revision walk"));
 812        if (!(old_commit->object.flags & UNINTERESTING))
 813                suggest_reattach(old_commit, &revs);
 814        else
 815                describe_detached_head(_("Previous HEAD position was"), old_commit);
 816
 817        /* Clean up objects used, as they will be reused. */
 818        clear_commit_marks_all(ALL_REV_FLAGS);
 819}
 820
 821static int switch_branches(const struct checkout_opts *opts,
 822                           struct branch_info *new_branch_info)
 823{
 824        int ret = 0;
 825        struct branch_info old_branch_info;
 826        void *path_to_free;
 827        struct object_id rev;
 828        int flag, writeout_error = 0;
 829        memset(&old_branch_info, 0, sizeof(old_branch_info));
 830        old_branch_info.path = path_to_free = resolve_refdup("HEAD", 0, &rev, &flag);
 831        if (old_branch_info.path)
 832                old_branch_info.commit = lookup_commit_reference_gently(&rev, 1);
 833        if (!(flag & REF_ISSYMREF))
 834                old_branch_info.path = NULL;
 835
 836        if (old_branch_info.path)
 837                skip_prefix(old_branch_info.path, "refs/heads/", &old_branch_info.name);
 838
 839        if (!new_branch_info->name) {
 840                new_branch_info->name = "HEAD";
 841                new_branch_info->commit = old_branch_info.commit;
 842                if (!new_branch_info->commit)
 843                        die(_("You are on a branch yet to be born"));
 844                parse_commit_or_die(new_branch_info->commit);
 845        }
 846
 847        ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
 848        if (ret) {
 849                free(path_to_free);
 850                return ret;
 851        }
 852
 853        if (!opts->quiet && !old_branch_info.path && old_branch_info.commit && new_branch_info->commit != old_branch_info.commit)
 854                orphaned_commit_warning(old_branch_info.commit, new_branch_info->commit);
 855
 856        update_refs_for_switch(opts, &old_branch_info, new_branch_info);
 857
 858        ret = post_checkout_hook(old_branch_info.commit, new_branch_info->commit, 1);
 859        free(path_to_free);
 860        return ret || writeout_error;
 861}
 862
 863static int git_checkout_config(const char *var, const char *value, void *cb)
 864{
 865        if (!strcmp(var, "diff.ignoresubmodules")) {
 866                struct checkout_opts *opts = cb;
 867                handle_ignore_submodules_arg(&opts->diff_options, value);
 868                return 0;
 869        }
 870
 871        if (starts_with(var, "submodule."))
 872                return git_default_submodule_config(var, value, NULL);
 873
 874        return git_xmerge_config(var, value, NULL);
 875}
 876
 877static int parse_branchname_arg(int argc, const char **argv,
 878                                int dwim_new_local_branch_ok,
 879                                struct branch_info *new_branch_info,
 880                                struct checkout_opts *opts,
 881                                struct object_id *rev)
 882{
 883        struct tree **source_tree = &opts->source_tree;
 884        const char **new_branch = &opts->new_branch;
 885        int argcount = 0;
 886        struct object_id branch_rev;
 887        const char *arg;
 888        int dash_dash_pos;
 889        int has_dash_dash = 0;
 890        int i;
 891
 892        /*
 893         * case 1: git checkout <ref> -- [<paths>]
 894         *
 895         *   <ref> must be a valid tree, everything after the '--' must be
 896         *   a path.
 897         *
 898         * case 2: git checkout -- [<paths>]
 899         *
 900         *   everything after the '--' must be paths.
 901         *
 902         * case 3: git checkout <something> [--]
 903         *
 904         *   (a) If <something> is a commit, that is to
 905         *       switch to the branch or detach HEAD at it.  As a special case,
 906         *       if <something> is A...B (missing A or B means HEAD but you can
 907         *       omit at most one side), and if there is a unique merge base
 908         *       between A and B, A...B names that merge base.
 909         *
 910         *   (b) If <something> is _not_ a commit, either "--" is present
 911         *       or <something> is not a path, no -t or -b was given, and
 912         *       and there is a tracking branch whose name is <something>
 913         *       in one and only one remote, then this is a short-hand to
 914         *       fork local <something> from that remote-tracking branch.
 915         *
 916         *   (c) Otherwise, if "--" is present, treat it like case (1).
 917         *
 918         *   (d) Otherwise :
 919         *       - if it's a reference, treat it like case (1)
 920         *       - else if it's a path, treat it like case (2)
 921         *       - else: fail.
 922         *
 923         * case 4: git checkout <something> <paths>
 924         *
 925         *   The first argument must not be ambiguous.
 926         *   - If it's *only* a reference, treat it like case (1).
 927         *   - If it's only a path, treat it like case (2).
 928         *   - else: fail.
 929         *
 930         */
 931        if (!argc)
 932                return 0;
 933
 934        arg = argv[0];
 935        dash_dash_pos = -1;
 936        for (i = 0; i < argc; i++) {
 937                if (!strcmp(argv[i], "--")) {
 938                        dash_dash_pos = i;
 939                        break;
 940                }
 941        }
 942        if (dash_dash_pos == 0)
 943                return 1; /* case (2) */
 944        else if (dash_dash_pos == 1)
 945                has_dash_dash = 1; /* case (3) or (1) */
 946        else if (dash_dash_pos >= 2)
 947                die(_("only one reference expected, %d given."), dash_dash_pos);
 948
 949        if (!strcmp(arg, "-"))
 950                arg = "@{-1}";
 951
 952        if (get_oid_mb(arg, rev)) {
 953                /*
 954                 * Either case (3) or (4), with <something> not being
 955                 * a commit, or an attempt to use case (1) with an
 956                 * invalid ref.
 957                 *
 958                 * It's likely an error, but we need to find out if
 959                 * we should auto-create the branch, case (3).(b).
 960                 */
 961                int recover_with_dwim = dwim_new_local_branch_ok;
 962
 963                if (!has_dash_dash &&
 964                    (check_filename(opts->prefix, arg) || !no_wildcard(arg)))
 965                        recover_with_dwim = 0;
 966                /*
 967                 * Accept "git checkout foo" and "git checkout foo --"
 968                 * as candidates for dwim.
 969                 */
 970                if (!(argc == 1 && !has_dash_dash) &&
 971                    !(argc == 2 && has_dash_dash))
 972                        recover_with_dwim = 0;
 973
 974                if (recover_with_dwim) {
 975                        const char *remote = unique_tracking_name(arg, rev);
 976                        if (remote) {
 977                                *new_branch = arg;
 978                                arg = remote;
 979                                /* DWIMmed to create local branch, case (3).(b) */
 980                        } else {
 981                                recover_with_dwim = 0;
 982                        }
 983                }
 984
 985                if (!recover_with_dwim) {
 986                        if (has_dash_dash)
 987                                die(_("invalid reference: %s"), arg);
 988                        return argcount;
 989                }
 990        }
 991
 992        /* we can't end up being in (2) anymore, eat the argument */
 993        argcount++;
 994        argv++;
 995        argc--;
 996
 997        new_branch_info->name = arg;
 998        setup_branch_path(new_branch_info);
 999
1000        if (!check_refname_format(new_branch_info->path, 0) &&
1001            !read_ref(new_branch_info->path, &branch_rev))
1002                oidcpy(rev, &branch_rev);
1003        else
1004                new_branch_info->path = NULL; /* not an existing branch */
1005
1006        new_branch_info->commit = lookup_commit_reference_gently(rev, 1);
1007        if (!new_branch_info->commit) {
1008                /* not a commit */
1009                *source_tree = parse_tree_indirect(rev);
1010        } else {
1011                parse_commit_or_die(new_branch_info->commit);
1012                *source_tree = get_commit_tree(new_branch_info->commit);
1013        }
1014
1015        if (!*source_tree)                   /* case (1): want a tree */
1016                die(_("reference is not a tree: %s"), arg);
1017        if (!has_dash_dash) {   /* case (3).(d) -> (1) */
1018                /*
1019                 * Do not complain the most common case
1020                 *      git checkout branch
1021                 * even if there happen to be a file called 'branch';
1022                 * it would be extremely annoying.
1023                 */
1024                if (argc)
1025                        verify_non_filename(opts->prefix, arg);
1026        } else {
1027                argcount++;
1028                argv++;
1029                argc--;
1030        }
1031
1032        return argcount;
1033}
1034
1035static int switch_unborn_to_new_branch(const struct checkout_opts *opts)
1036{
1037        int status;
1038        struct strbuf branch_ref = STRBUF_INIT;
1039
1040        if (!opts->new_branch)
1041                die(_("You are on a branch yet to be born"));
1042        strbuf_addf(&branch_ref, "refs/heads/%s", opts->new_branch);
1043        status = create_symref("HEAD", branch_ref.buf, "checkout -b");
1044        strbuf_release(&branch_ref);
1045        if (!opts->quiet)
1046                fprintf(stderr, _("Switched to a new branch '%s'\n"),
1047                        opts->new_branch);
1048        return status;
1049}
1050
1051static int checkout_branch(struct checkout_opts *opts,
1052                           struct branch_info *new_branch_info)
1053{
1054        if (opts->pathspec.nr)
1055                die(_("paths cannot be used with switching branches"));
1056
1057        if (opts->patch_mode)
1058                die(_("'%s' cannot be used with switching branches"),
1059                    "--patch");
1060
1061        if (opts->writeout_stage)
1062                die(_("'%s' cannot be used with switching branches"),
1063                    "--ours/--theirs");
1064
1065        if (opts->force && opts->merge)
1066                die(_("'%s' cannot be used with '%s'"), "-f", "-m");
1067
1068        if (opts->force_detach && opts->new_branch)
1069                die(_("'%s' cannot be used with '%s'"),
1070                    "--detach", "-b/-B/--orphan");
1071
1072        if (opts->new_orphan_branch) {
1073                if (opts->track != BRANCH_TRACK_UNSPECIFIED)
1074                        die(_("'%s' cannot be used with '%s'"), "--orphan", "-t");
1075        } else if (opts->force_detach) {
1076                if (opts->track != BRANCH_TRACK_UNSPECIFIED)
1077                        die(_("'%s' cannot be used with '%s'"), "--detach", "-t");
1078        } else if (opts->track == BRANCH_TRACK_UNSPECIFIED)
1079                opts->track = git_branch_track;
1080
1081        if (new_branch_info->name && !new_branch_info->commit)
1082                die(_("Cannot switch branch to a non-commit '%s'"),
1083                    new_branch_info->name);
1084
1085        if (new_branch_info->path && !opts->force_detach && !opts->new_branch &&
1086            !opts->ignore_other_worktrees) {
1087                int flag;
1088                char *head_ref = resolve_refdup("HEAD", 0, NULL, &flag);
1089                if (head_ref &&
1090                    (!(flag & REF_ISSYMREF) || strcmp(head_ref, new_branch_info->path)))
1091                        die_if_checked_out(new_branch_info->path, 1);
1092                free(head_ref);
1093        }
1094
1095        if (!new_branch_info->commit && opts->new_branch) {
1096                struct object_id rev;
1097                int flag;
1098
1099                if (!read_ref_full("HEAD", 0, &rev, &flag) &&
1100                    (flag & REF_ISSYMREF) && is_null_oid(&rev))
1101                        return switch_unborn_to_new_branch(opts);
1102        }
1103        return switch_branches(opts, new_branch_info);
1104}
1105
1106int cmd_checkout(int argc, const char **argv, const char *prefix)
1107{
1108        struct checkout_opts opts;
1109        struct branch_info new_branch_info;
1110        char *conflict_style = NULL;
1111        int dwim_new_local_branch = 1;
1112        struct option options[] = {
1113                OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
1114                OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
1115                           N_("create and checkout a new branch")),
1116                OPT_STRING('B', NULL, &opts.new_branch_force, N_("branch"),
1117                           N_("create/reset and checkout a branch")),
1118                OPT_BOOL('l', NULL, &opts.new_branch_log, N_("create reflog for new branch")),
1119                OPT_BOOL(0, "detach", &opts.force_detach, N_("detach HEAD at named commit")),
1120                OPT_SET_INT('t', "track",  &opts.track, N_("set upstream info for new branch"),
1121                        BRANCH_TRACK_EXPLICIT),
1122                OPT_STRING(0, "orphan", &opts.new_orphan_branch, N_("new-branch"), N_("new unparented branch")),
1123                OPT_SET_INT_F('2', "ours", &opts.writeout_stage,
1124                              N_("checkout our version for unmerged files"),
1125                              2, PARSE_OPT_NONEG),
1126                OPT_SET_INT_F('3', "theirs", &opts.writeout_stage,
1127                              N_("checkout their version for unmerged files"),
1128                              3, PARSE_OPT_NONEG),
1129                OPT__FORCE(&opts.force, N_("force checkout (throw away local modifications)"),
1130                           PARSE_OPT_NOCOMPLETE),
1131                OPT_BOOL('m', "merge", &opts.merge, N_("perform a 3-way merge with the new branch")),
1132                OPT_BOOL_F(0, "overwrite-ignore", &opts.overwrite_ignore,
1133                           N_("update ignored files (default)"),
1134                           PARSE_OPT_NOCOMPLETE),
1135                OPT_STRING(0, "conflict", &conflict_style, N_("style"),
1136                           N_("conflict style (merge or diff3)")),
1137                OPT_BOOL('p', "patch", &opts.patch_mode, N_("select hunks interactively")),
1138                OPT_BOOL(0, "ignore-skip-worktree-bits", &opts.ignore_skipworktree,
1139                         N_("do not limit pathspecs to sparse entries only")),
1140                OPT_HIDDEN_BOOL(0, "guess", &dwim_new_local_branch,
1141                                N_("second guess 'git checkout <no-such-branch>'")),
1142                OPT_BOOL(0, "ignore-other-worktrees", &opts.ignore_other_worktrees,
1143                         N_("do not check if another worktree is holding the given ref")),
1144                { OPTION_CALLBACK, 0, "recurse-submodules", NULL,
1145                            "checkout", "control recursive updating of submodules",
1146                            PARSE_OPT_OPTARG, option_parse_recurse_submodules_worktree_updater },
1147                OPT_BOOL(0, "progress", &opts.show_progress, N_("force progress reporting")),
1148                OPT_END(),
1149        };
1150
1151        memset(&opts, 0, sizeof(opts));
1152        memset(&new_branch_info, 0, sizeof(new_branch_info));
1153        opts.overwrite_ignore = 1;
1154        opts.prefix = prefix;
1155        opts.show_progress = -1;
1156
1157        git_config(git_checkout_config, &opts);
1158
1159        opts.track = BRANCH_TRACK_UNSPECIFIED;
1160
1161        argc = parse_options(argc, argv, prefix, options, checkout_usage,
1162                             PARSE_OPT_KEEP_DASHDASH);
1163
1164        if (opts.show_progress < 0) {
1165                if (opts.quiet)
1166                        opts.show_progress = 0;
1167                else
1168                        opts.show_progress = isatty(2);
1169        }
1170
1171        if (conflict_style) {
1172                opts.merge = 1; /* implied */
1173                git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
1174        }
1175
1176        if ((!!opts.new_branch + !!opts.new_branch_force + !!opts.new_orphan_branch) > 1)
1177                die(_("-b, -B and --orphan are mutually exclusive"));
1178
1179        /*
1180         * From here on, new_branch will contain the branch to be checked out,
1181         * and new_branch_force and new_orphan_branch will tell us which one of
1182         * -b/-B/--orphan is being used.
1183         */
1184        if (opts.new_branch_force)
1185                opts.new_branch = opts.new_branch_force;
1186
1187        if (opts.new_orphan_branch)
1188                opts.new_branch = opts.new_orphan_branch;
1189
1190        /* --track without -b/-B/--orphan should DWIM */
1191        if (opts.track != BRANCH_TRACK_UNSPECIFIED && !opts.new_branch) {
1192                const char *argv0 = argv[0];
1193                if (!argc || !strcmp(argv0, "--"))
1194                        die (_("--track needs a branch name"));
1195                skip_prefix(argv0, "refs/", &argv0);
1196                skip_prefix(argv0, "remotes/", &argv0);
1197                argv0 = strchr(argv0, '/');
1198                if (!argv0 || !argv0[1])
1199                        die (_("Missing branch name; try -b"));
1200                opts.new_branch = argv0 + 1;
1201        }
1202
1203        /*
1204         * Extract branch name from command line arguments, so
1205         * all that is left is pathspecs.
1206         *
1207         * Handle
1208         *
1209         *  1) git checkout <tree> -- [<paths>]
1210         *  2) git checkout -- [<paths>]
1211         *  3) git checkout <something> [<paths>]
1212         *
1213         * including "last branch" syntax and DWIM-ery for names of
1214         * remote branches, erroring out for invalid or ambiguous cases.
1215         */
1216        if (argc) {
1217                struct object_id rev;
1218                int dwim_ok =
1219                        !opts.patch_mode &&
1220                        dwim_new_local_branch &&
1221                        opts.track == BRANCH_TRACK_UNSPECIFIED &&
1222                        !opts.new_branch;
1223                int n = parse_branchname_arg(argc, argv, dwim_ok,
1224                                             &new_branch_info, &opts, &rev);
1225                argv += n;
1226                argc -= n;
1227        }
1228
1229        if (argc) {
1230                parse_pathspec(&opts.pathspec, 0,
1231                               opts.patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0,
1232                               prefix, argv);
1233
1234                if (!opts.pathspec.nr)
1235                        die(_("invalid path specification"));
1236
1237                /*
1238                 * Try to give more helpful suggestion.
1239                 * new_branch && argc > 1 will be caught later.
1240                 */
1241                if (opts.new_branch && argc == 1)
1242                        die(_("'%s' is not a commit and a branch '%s' cannot be created from it"),
1243                                argv[0], opts.new_branch);
1244
1245                if (opts.force_detach)
1246                        die(_("git checkout: --detach does not take a path argument '%s'"),
1247                            argv[0]);
1248
1249                if (1 < !!opts.writeout_stage + !!opts.force + !!opts.merge)
1250                        die(_("git checkout: --ours/--theirs, --force and --merge are incompatible when\n"
1251                              "checking out of the index."));
1252        }
1253
1254        if (opts.new_branch) {
1255                struct strbuf buf = STRBUF_INIT;
1256
1257                if (opts.new_branch_force)
1258                        opts.branch_exists = validate_branchname(opts.new_branch, &buf);
1259                else
1260                        opts.branch_exists =
1261                                validate_new_branchname(opts.new_branch, &buf, 0);
1262                strbuf_release(&buf);
1263        }
1264
1265        UNLEAK(opts);
1266        if (opts.patch_mode || opts.pathspec.nr)
1267                return checkout_paths(&opts, new_branch_info.name);
1268        else
1269                return checkout_branch(&opts, &new_branch_info);
1270}