Andrew's git / gitweb.git / builtin/rebase.c
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builtin / rebase.con commit fast-export: do automatic reencoding of commit messages only if requested (e80001f)
   1/*
   2 * "git rebase" builtin command
   3 *
   4 * Copyright (c) 2018 Pratik Karki
   5 */
   6
   7#define USE_THE_INDEX_COMPATIBILITY_MACROS
   8#include "builtin.h"
   9#include "run-command.h"
  10#include "exec-cmd.h"
  11#include "argv-array.h"
  12#include "dir.h"
  13#include "packfile.h"
  14#include "refs.h"
  15#include "quote.h"
  16#include "config.h"
  17#include "cache-tree.h"
  18#include "unpack-trees.h"
  19#include "lockfile.h"
  20#include "parse-options.h"
  21#include "commit.h"
  22#include "diff.h"
  23#include "wt-status.h"
  24#include "revision.h"
  25#include "commit-reach.h"
  26#include "rerere.h"
  27#include "branch.h"
  28
  29static char const * const builtin_rebase_usage[] = {
  30        N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
  31                "[<upstream>] [<branch>]"),
  32        N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
  33                "--root [<branch>]"),
  34        N_("git rebase --continue | --abort | --skip | --edit-todo"),
  35        NULL
  36};
  37
  38static GIT_PATH_FUNC(apply_dir, "rebase-apply")
  39static GIT_PATH_FUNC(merge_dir, "rebase-merge")
  40
  41enum rebase_type {
  42        REBASE_UNSPECIFIED = -1,
  43        REBASE_AM,
  44        REBASE_MERGE,
  45        REBASE_INTERACTIVE,
  46        REBASE_PRESERVE_MERGES
  47};
  48
  49struct rebase_options {
  50        enum rebase_type type;
  51        const char *state_dir;
  52        struct commit *upstream;
  53        const char *upstream_name;
  54        const char *upstream_arg;
  55        char *head_name;
  56        struct object_id orig_head;
  57        struct commit *onto;
  58        const char *onto_name;
  59        const char *revisions;
  60        const char *switch_to;
  61        int root;
  62        struct object_id *squash_onto;
  63        struct commit *restrict_revision;
  64        int dont_finish_rebase;
  65        enum {
  66                REBASE_NO_QUIET = 1<<0,
  67                REBASE_VERBOSE = 1<<1,
  68                REBASE_DIFFSTAT = 1<<2,
  69                REBASE_FORCE = 1<<3,
  70                REBASE_INTERACTIVE_EXPLICIT = 1<<4,
  71        } flags;
  72        struct argv_array git_am_opts;
  73        const char *action;
  74        int signoff;
  75        int allow_rerere_autoupdate;
  76        int keep_empty;
  77        int autosquash;
  78        char *gpg_sign_opt;
  79        int autostash;
  80        char *cmd;
  81        int allow_empty_message;
  82        int rebase_merges, rebase_cousins;
  83        char *strategy, *strategy_opts;
  84        struct strbuf git_format_patch_opt;
  85        int reschedule_failed_exec;
  86        int use_legacy_rebase;
  87};
  88
  89static int is_interactive(struct rebase_options *opts)
  90{
  91        return opts->type == REBASE_INTERACTIVE ||
  92                opts->type == REBASE_PRESERVE_MERGES;
  93}
  94
  95static void imply_interactive(struct rebase_options *opts, const char *option)
  96{
  97        switch (opts->type) {
  98        case REBASE_AM:
  99                die(_("%s requires an interactive rebase"), option);
 100                break;
 101        case REBASE_INTERACTIVE:
 102        case REBASE_PRESERVE_MERGES:
 103                break;
 104        case REBASE_MERGE:
 105                /* we now implement --merge via --interactive */
 106        default:
 107                opts->type = REBASE_INTERACTIVE; /* implied */
 108                break;
 109        }
 110}
 111
 112/* Returns the filename prefixed by the state_dir */
 113static const char *state_dir_path(const char *filename, struct rebase_options *opts)
 114{
 115        static struct strbuf path = STRBUF_INIT;
 116        static size_t prefix_len;
 117
 118        if (!prefix_len) {
 119                strbuf_addf(&path, "%s/", opts->state_dir);
 120                prefix_len = path.len;
 121        }
 122
 123        strbuf_setlen(&path, prefix_len);
 124        strbuf_addstr(&path, filename);
 125        return path.buf;
 126}
 127
 128/* Read one file, then strip line endings */
 129static int read_one(const char *path, struct strbuf *buf)
 130{
 131        if (strbuf_read_file(buf, path, 0) < 0)
 132                return error_errno(_("could not read '%s'"), path);
 133        strbuf_trim_trailing_newline(buf);
 134        return 0;
 135}
 136
 137/* Initialize the rebase options from the state directory. */
 138static int read_basic_state(struct rebase_options *opts)
 139{
 140        struct strbuf head_name = STRBUF_INIT;
 141        struct strbuf buf = STRBUF_INIT;
 142        struct object_id oid;
 143
 144        if (read_one(state_dir_path("head-name", opts), &head_name) ||
 145            read_one(state_dir_path("onto", opts), &buf))
 146                return -1;
 147        opts->head_name = starts_with(head_name.buf, "refs/") ?
 148                xstrdup(head_name.buf) : NULL;
 149        strbuf_release(&head_name);
 150        if (get_oid(buf.buf, &oid))
 151                return error(_("could not get 'onto': '%s'"), buf.buf);
 152        opts->onto = lookup_commit_or_die(&oid, buf.buf);
 153
 154        /*
 155         * We always write to orig-head, but interactive rebase used to write to
 156         * head. Fall back to reading from head to cover for the case that the
 157         * user upgraded git with an ongoing interactive rebase.
 158         */
 159        strbuf_reset(&buf);
 160        if (file_exists(state_dir_path("orig-head", opts))) {
 161                if (read_one(state_dir_path("orig-head", opts), &buf))
 162                        return -1;
 163        } else if (read_one(state_dir_path("head", opts), &buf))
 164                return -1;
 165        if (get_oid(buf.buf, &opts->orig_head))
 166                return error(_("invalid orig-head: '%s'"), buf.buf);
 167
 168        if (file_exists(state_dir_path("quiet", opts)))
 169                opts->flags &= ~REBASE_NO_QUIET;
 170        else
 171                opts->flags |= REBASE_NO_QUIET;
 172
 173        if (file_exists(state_dir_path("verbose", opts)))
 174                opts->flags |= REBASE_VERBOSE;
 175
 176        if (file_exists(state_dir_path("signoff", opts))) {
 177                opts->signoff = 1;
 178                opts->flags |= REBASE_FORCE;
 179        }
 180
 181        if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
 182                strbuf_reset(&buf);
 183                if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
 184                            &buf))
 185                        return -1;
 186                if (!strcmp(buf.buf, "--rerere-autoupdate"))
 187                        opts->allow_rerere_autoupdate = 1;
 188                else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
 189                        opts->allow_rerere_autoupdate = 0;
 190                else
 191                        warning(_("ignoring invalid allow_rerere_autoupdate: "
 192                                  "'%s'"), buf.buf);
 193        } else
 194                opts->allow_rerere_autoupdate = -1;
 195
 196        if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
 197                strbuf_reset(&buf);
 198                if (read_one(state_dir_path("gpg_sign_opt", opts),
 199                            &buf))
 200                        return -1;
 201                free(opts->gpg_sign_opt);
 202                opts->gpg_sign_opt = xstrdup(buf.buf);
 203        }
 204
 205        if (file_exists(state_dir_path("strategy", opts))) {
 206                strbuf_reset(&buf);
 207                if (read_one(state_dir_path("strategy", opts), &buf))
 208                        return -1;
 209                free(opts->strategy);
 210                opts->strategy = xstrdup(buf.buf);
 211        }
 212
 213        if (file_exists(state_dir_path("strategy_opts", opts))) {
 214                strbuf_reset(&buf);
 215                if (read_one(state_dir_path("strategy_opts", opts), &buf))
 216                        return -1;
 217                free(opts->strategy_opts);
 218                opts->strategy_opts = xstrdup(buf.buf);
 219        }
 220
 221        strbuf_release(&buf);
 222
 223        return 0;
 224}
 225
 226static int write_basic_state(struct rebase_options *opts)
 227{
 228        write_file(state_dir_path("head-name", opts), "%s",
 229                   opts->head_name ? opts->head_name : "detached HEAD");
 230        write_file(state_dir_path("onto", opts), "%s",
 231                   opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
 232        write_file(state_dir_path("orig-head", opts), "%s",
 233                   oid_to_hex(&opts->orig_head));
 234        write_file(state_dir_path("quiet", opts), "%s",
 235                   opts->flags & REBASE_NO_QUIET ? "" : "t");
 236        if (opts->flags & REBASE_VERBOSE)
 237                write_file(state_dir_path("verbose", opts), "%s", "");
 238        if (opts->strategy)
 239                write_file(state_dir_path("strategy", opts), "%s",
 240                           opts->strategy);
 241        if (opts->strategy_opts)
 242                write_file(state_dir_path("strategy_opts", opts), "%s",
 243                           opts->strategy_opts);
 244        if (opts->allow_rerere_autoupdate >= 0)
 245                write_file(state_dir_path("allow_rerere_autoupdate", opts),
 246                           "-%s-rerere-autoupdate",
 247                           opts->allow_rerere_autoupdate ? "" : "-no");
 248        if (opts->gpg_sign_opt)
 249                write_file(state_dir_path("gpg_sign_opt", opts), "%s",
 250                           opts->gpg_sign_opt);
 251        if (opts->signoff)
 252                write_file(state_dir_path("strategy", opts), "--signoff");
 253
 254        return 0;
 255}
 256
 257static int apply_autostash(struct rebase_options *opts)
 258{
 259        const char *path = state_dir_path("autostash", opts);
 260        struct strbuf autostash = STRBUF_INIT;
 261        struct child_process stash_apply = CHILD_PROCESS_INIT;
 262
 263        if (!file_exists(path))
 264                return 0;
 265
 266        if (read_one(path, &autostash))
 267                return error(_("Could not read '%s'"), path);
 268        /* Ensure that the hash is not mistaken for a number */
 269        strbuf_addstr(&autostash, "^0");
 270        argv_array_pushl(&stash_apply.args,
 271                         "stash", "apply", autostash.buf, NULL);
 272        stash_apply.git_cmd = 1;
 273        stash_apply.no_stderr = stash_apply.no_stdout =
 274                stash_apply.no_stdin = 1;
 275        if (!run_command(&stash_apply))
 276                printf(_("Applied autostash.\n"));
 277        else {
 278                struct argv_array args = ARGV_ARRAY_INIT;
 279                int res = 0;
 280
 281                argv_array_pushl(&args,
 282                                 "stash", "store", "-m", "autostash", "-q",
 283                                 autostash.buf, NULL);
 284                if (run_command_v_opt(args.argv, RUN_GIT_CMD))
 285                        res = error(_("Cannot store %s"), autostash.buf);
 286                argv_array_clear(&args);
 287                strbuf_release(&autostash);
 288                if (res)
 289                        return res;
 290
 291                fprintf(stderr,
 292                        _("Applying autostash resulted in conflicts.\n"
 293                          "Your changes are safe in the stash.\n"
 294                          "You can run \"git stash pop\" or \"git stash drop\" "
 295                          "at any time.\n"));
 296        }
 297
 298        strbuf_release(&autostash);
 299        return 0;
 300}
 301
 302static int finish_rebase(struct rebase_options *opts)
 303{
 304        struct strbuf dir = STRBUF_INIT;
 305        const char *argv_gc_auto[] = { "gc", "--auto", NULL };
 306
 307        delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
 308        apply_autostash(opts);
 309        close_all_packs(the_repository->objects);
 310        /*
 311         * We ignore errors in 'gc --auto', since the
 312         * user should see them.
 313         */
 314        run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
 315        strbuf_addstr(&dir, opts->state_dir);
 316        remove_dir_recursively(&dir, 0);
 317        strbuf_release(&dir);
 318
 319        return 0;
 320}
 321
 322static struct commit *peel_committish(const char *name)
 323{
 324        struct object *obj;
 325        struct object_id oid;
 326
 327        if (get_oid(name, &oid))
 328                return NULL;
 329        obj = parse_object(the_repository, &oid);
 330        return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
 331}
 332
 333static void add_var(struct strbuf *buf, const char *name, const char *value)
 334{
 335        if (!value)
 336                strbuf_addf(buf, "unset %s; ", name);
 337        else {
 338                strbuf_addf(buf, "%s=", name);
 339                sq_quote_buf(buf, value);
 340                strbuf_addstr(buf, "; ");
 341        }
 342}
 343
 344#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
 345
 346#define RESET_HEAD_DETACH (1<<0)
 347#define RESET_HEAD_HARD (1<<1)
 348#define RESET_HEAD_RUN_POST_CHECKOUT_HOOK (1<<2)
 349#define RESET_HEAD_REFS_ONLY (1<<3)
 350#define RESET_ORIG_HEAD (1<<4)
 351
 352static int reset_head(struct object_id *oid, const char *action,
 353                      const char *switch_to_branch, unsigned flags,
 354                      const char *reflog_orig_head, const char *reflog_head)
 355{
 356        unsigned detach_head = flags & RESET_HEAD_DETACH;
 357        unsigned reset_hard = flags & RESET_HEAD_HARD;
 358        unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
 359        unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
 360        unsigned update_orig_head = flags & RESET_ORIG_HEAD;
 361        struct object_id head_oid;
 362        struct tree_desc desc[2] = { { NULL }, { NULL } };
 363        struct lock_file lock = LOCK_INIT;
 364        struct unpack_trees_options unpack_tree_opts;
 365        struct tree *tree;
 366        const char *reflog_action;
 367        struct strbuf msg = STRBUF_INIT;
 368        size_t prefix_len;
 369        struct object_id *orig = NULL, oid_orig,
 370                *old_orig = NULL, oid_old_orig;
 371        int ret = 0, nr = 0;
 372
 373        if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
 374                BUG("Not a fully qualified branch: '%s'", switch_to_branch);
 375
 376        if (!refs_only && hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
 377                ret = -1;
 378                goto leave_reset_head;
 379        }
 380
 381        if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
 382                ret = error(_("could not determine HEAD revision"));
 383                goto leave_reset_head;
 384        }
 385
 386        if (!oid)
 387                oid = &head_oid;
 388
 389        if (refs_only)
 390                goto reset_head_refs;
 391
 392        memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
 393        setup_unpack_trees_porcelain(&unpack_tree_opts, action);
 394        unpack_tree_opts.head_idx = 1;
 395        unpack_tree_opts.src_index = the_repository->index;
 396        unpack_tree_opts.dst_index = the_repository->index;
 397        unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
 398        unpack_tree_opts.update = 1;
 399        unpack_tree_opts.merge = 1;
 400        if (!detach_head)
 401                unpack_tree_opts.reset = 1;
 402
 403        if (repo_read_index_unmerged(the_repository) < 0) {
 404                ret = error(_("could not read index"));
 405                goto leave_reset_head;
 406        }
 407
 408        if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
 409                ret = error(_("failed to find tree of %s"),
 410                            oid_to_hex(&head_oid));
 411                goto leave_reset_head;
 412        }
 413
 414        if (!fill_tree_descriptor(&desc[nr++], oid)) {
 415                ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
 416                goto leave_reset_head;
 417        }
 418
 419        if (unpack_trees(nr, desc, &unpack_tree_opts)) {
 420                ret = -1;
 421                goto leave_reset_head;
 422        }
 423
 424        tree = parse_tree_indirect(oid);
 425        prime_cache_tree(the_repository, the_repository->index, tree);
 426
 427        if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
 428                ret = error(_("could not write index"));
 429                goto leave_reset_head;
 430        }
 431
 432reset_head_refs:
 433        reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
 434        strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
 435        prefix_len = msg.len;
 436
 437        if (update_orig_head) {
 438                if (!get_oid("ORIG_HEAD", &oid_old_orig))
 439                        old_orig = &oid_old_orig;
 440                if (!get_oid("HEAD", &oid_orig)) {
 441                        orig = &oid_orig;
 442                        if (!reflog_orig_head) {
 443                                strbuf_addstr(&msg, "updating ORIG_HEAD");
 444                                reflog_orig_head = msg.buf;
 445                        }
 446                        update_ref(reflog_orig_head, "ORIG_HEAD", orig,
 447                                   old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
 448                } else if (old_orig)
 449                        delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
 450        }
 451
 452        if (!reflog_head) {
 453                strbuf_setlen(&msg, prefix_len);
 454                strbuf_addstr(&msg, "updating HEAD");
 455                reflog_head = msg.buf;
 456        }
 457        if (!switch_to_branch)
 458                ret = update_ref(reflog_head, "HEAD", oid, orig,
 459                                 detach_head ? REF_NO_DEREF : 0,
 460                                 UPDATE_REFS_MSG_ON_ERR);
 461        else {
 462                ret = update_ref(reflog_head, switch_to_branch, oid,
 463                                 NULL, 0, UPDATE_REFS_MSG_ON_ERR);
 464                if (!ret)
 465                        ret = create_symref("HEAD", switch_to_branch,
 466                                            reflog_head);
 467        }
 468        if (run_hook)
 469                run_hook_le(NULL, "post-checkout",
 470                            oid_to_hex(orig ? orig : &null_oid),
 471                            oid_to_hex(oid), "1", NULL);
 472
 473leave_reset_head:
 474        strbuf_release(&msg);
 475        rollback_lock_file(&lock);
 476        while (nr)
 477                free((void *)desc[--nr].buffer);
 478        return ret;
 479}
 480
 481static int move_to_original_branch(struct rebase_options *opts)
 482{
 483        struct strbuf orig_head_reflog = STRBUF_INIT, head_reflog = STRBUF_INIT;
 484        int ret;
 485
 486        if (!opts->head_name)
 487                return 0; /* nothing to move back to */
 488
 489        if (!opts->onto)
 490                BUG("move_to_original_branch without onto");
 491
 492        strbuf_addf(&orig_head_reflog, "rebase finished: %s onto %s",
 493                    opts->head_name, oid_to_hex(&opts->onto->object.oid));
 494        strbuf_addf(&head_reflog, "rebase finished: returning to %s",
 495                    opts->head_name);
 496        ret = reset_head(NULL, "", opts->head_name, RESET_HEAD_REFS_ONLY,
 497                         orig_head_reflog.buf, head_reflog.buf);
 498
 499        strbuf_release(&orig_head_reflog);
 500        strbuf_release(&head_reflog);
 501        return ret;
 502}
 503
 504static const char *resolvemsg =
 505N_("Resolve all conflicts manually, mark them as resolved with\n"
 506"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
 507"You can instead skip this commit: run \"git rebase --skip\".\n"
 508"To abort and get back to the state before \"git rebase\", run "
 509"\"git rebase --abort\".");
 510
 511static int run_am(struct rebase_options *opts)
 512{
 513        struct child_process am = CHILD_PROCESS_INIT;
 514        struct child_process format_patch = CHILD_PROCESS_INIT;
 515        struct strbuf revisions = STRBUF_INIT;
 516        int status;
 517        char *rebased_patches;
 518
 519        am.git_cmd = 1;
 520        argv_array_push(&am.args, "am");
 521
 522        if (opts->action && !strcmp("continue", opts->action)) {
 523                argv_array_push(&am.args, "--resolved");
 524                argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 525                if (opts->gpg_sign_opt)
 526                        argv_array_push(&am.args, opts->gpg_sign_opt);
 527                status = run_command(&am);
 528                if (status)
 529                        return status;
 530
 531                return move_to_original_branch(opts);
 532        }
 533        if (opts->action && !strcmp("skip", opts->action)) {
 534                argv_array_push(&am.args, "--skip");
 535                argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 536                status = run_command(&am);
 537                if (status)
 538                        return status;
 539
 540                return move_to_original_branch(opts);
 541        }
 542        if (opts->action && !strcmp("show-current-patch", opts->action)) {
 543                argv_array_push(&am.args, "--show-current-patch");
 544                return run_command(&am);
 545        }
 546
 547        strbuf_addf(&revisions, "%s...%s",
 548                    oid_to_hex(opts->root ?
 549                               /* this is now equivalent to !opts->upstream */
 550                               &opts->onto->object.oid :
 551                               &opts->upstream->object.oid),
 552                    oid_to_hex(&opts->orig_head));
 553
 554        rebased_patches = xstrdup(git_path("rebased-patches"));
 555        format_patch.out = open(rebased_patches,
 556                                O_WRONLY | O_CREAT | O_TRUNC, 0666);
 557        if (format_patch.out < 0) {
 558                status = error_errno(_("could not open '%s' for writing"),
 559                                     rebased_patches);
 560                free(rebased_patches);
 561                argv_array_clear(&am.args);
 562                return status;
 563        }
 564
 565        format_patch.git_cmd = 1;
 566        argv_array_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
 567                         "--full-index", "--cherry-pick", "--right-only",
 568                         "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
 569                         "--no-cover-letter", "--pretty=mboxrd", "--topo-order", NULL);
 570        if (opts->git_format_patch_opt.len)
 571                argv_array_split(&format_patch.args,
 572                                 opts->git_format_patch_opt.buf);
 573        argv_array_push(&format_patch.args, revisions.buf);
 574        if (opts->restrict_revision)
 575                argv_array_pushf(&format_patch.args, "^%s",
 576                                 oid_to_hex(&opts->restrict_revision->object.oid));
 577
 578        status = run_command(&format_patch);
 579        if (status) {
 580                unlink(rebased_patches);
 581                free(rebased_patches);
 582                argv_array_clear(&am.args);
 583
 584                reset_head(&opts->orig_head, "checkout", opts->head_name, 0,
 585                           "HEAD", NULL);
 586                error(_("\ngit encountered an error while preparing the "
 587                        "patches to replay\n"
 588                        "these revisions:\n"
 589                        "\n    %s\n\n"
 590                        "As a result, git cannot rebase them."),
 591                      opts->revisions);
 592
 593                strbuf_release(&revisions);
 594                return status;
 595        }
 596        strbuf_release(&revisions);
 597
 598        am.in = open(rebased_patches, O_RDONLY);
 599        if (am.in < 0) {
 600                status = error_errno(_("could not open '%s' for reading"),
 601                                     rebased_patches);
 602                free(rebased_patches);
 603                argv_array_clear(&am.args);
 604                return status;
 605        }
 606
 607        argv_array_pushv(&am.args, opts->git_am_opts.argv);
 608        argv_array_push(&am.args, "--rebasing");
 609        argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 610        argv_array_push(&am.args, "--patch-format=mboxrd");
 611        if (opts->allow_rerere_autoupdate > 0)
 612                argv_array_push(&am.args, "--rerere-autoupdate");
 613        else if (opts->allow_rerere_autoupdate == 0)
 614                argv_array_push(&am.args, "--no-rerere-autoupdate");
 615        if (opts->gpg_sign_opt)
 616                argv_array_push(&am.args, opts->gpg_sign_opt);
 617        status = run_command(&am);
 618        unlink(rebased_patches);
 619        free(rebased_patches);
 620
 621        if (!status) {
 622                return move_to_original_branch(opts);
 623        }
 624
 625        if (is_directory(opts->state_dir))
 626                write_basic_state(opts);
 627
 628        return status;
 629}
 630
 631static int run_specific_rebase(struct rebase_options *opts)
 632{
 633        const char *argv[] = { NULL, NULL };
 634        struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
 635        int status;
 636        const char *backend, *backend_func;
 637
 638        if (opts->type == REBASE_INTERACTIVE) {
 639                /* Run builtin interactive rebase */
 640                struct child_process child = CHILD_PROCESS_INIT;
 641
 642                argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
 643                                 resolvemsg);
 644                if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
 645                        argv_array_push(&child.env_array,
 646                                        "GIT_SEQUENCE_EDITOR=:");
 647                        opts->autosquash = 0;
 648                }
 649
 650                child.git_cmd = 1;
 651                argv_array_push(&child.args, "rebase--interactive");
 652
 653                if (opts->action)
 654                        argv_array_pushf(&child.args, "--%s", opts->action);
 655                if (opts->keep_empty)
 656                        argv_array_push(&child.args, "--keep-empty");
 657                if (opts->rebase_merges)
 658                        argv_array_push(&child.args, "--rebase-merges");
 659                if (opts->rebase_cousins)
 660                        argv_array_push(&child.args, "--rebase-cousins");
 661                if (opts->autosquash)
 662                        argv_array_push(&child.args, "--autosquash");
 663                if (opts->flags & REBASE_VERBOSE)
 664                        argv_array_push(&child.args, "--verbose");
 665                if (opts->flags & REBASE_FORCE)
 666                        argv_array_push(&child.args, "--no-ff");
 667                if (opts->restrict_revision)
 668                        argv_array_pushf(&child.args,
 669                                         "--restrict-revision=^%s",
 670                                         oid_to_hex(&opts->restrict_revision->object.oid));
 671                if (opts->upstream)
 672                        argv_array_pushf(&child.args, "--upstream=%s",
 673                                         oid_to_hex(&opts->upstream->object.oid));
 674                if (opts->onto)
 675                        argv_array_pushf(&child.args, "--onto=%s",
 676                                         oid_to_hex(&opts->onto->object.oid));
 677                if (opts->squash_onto)
 678                        argv_array_pushf(&child.args, "--squash-onto=%s",
 679                                         oid_to_hex(opts->squash_onto));
 680                if (opts->onto_name)
 681                        argv_array_pushf(&child.args, "--onto-name=%s",
 682                                         opts->onto_name);
 683                argv_array_pushf(&child.args, "--head-name=%s",
 684                                 opts->head_name ?
 685                                 opts->head_name : "detached HEAD");
 686                if (opts->strategy)
 687                        argv_array_pushf(&child.args, "--strategy=%s",
 688                                         opts->strategy);
 689                if (opts->strategy_opts)
 690                        argv_array_pushf(&child.args, "--strategy-opts=%s",
 691                                         opts->strategy_opts);
 692                if (opts->switch_to)
 693                        argv_array_pushf(&child.args, "--switch-to=%s",
 694                                         opts->switch_to);
 695                if (opts->cmd)
 696                        argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
 697                if (opts->allow_empty_message)
 698                        argv_array_push(&child.args, "--allow-empty-message");
 699                if (opts->allow_rerere_autoupdate > 0)
 700                        argv_array_push(&child.args, "--rerere-autoupdate");
 701                else if (opts->allow_rerere_autoupdate == 0)
 702                        argv_array_push(&child.args, "--no-rerere-autoupdate");
 703                if (opts->gpg_sign_opt)
 704                        argv_array_push(&child.args, opts->gpg_sign_opt);
 705                if (opts->signoff)
 706                        argv_array_push(&child.args, "--signoff");
 707                if (opts->reschedule_failed_exec)
 708                        argv_array_push(&child.args, "--reschedule-failed-exec");
 709
 710                status = run_command(&child);
 711                goto finished_rebase;
 712        }
 713
 714        if (opts->type == REBASE_AM) {
 715                status = run_am(opts);
 716                goto finished_rebase;
 717        }
 718
 719        add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
 720        add_var(&script_snippet, "state_dir", opts->state_dir);
 721
 722        add_var(&script_snippet, "upstream_name", opts->upstream_name);
 723        add_var(&script_snippet, "upstream", opts->upstream ?
 724                oid_to_hex(&opts->upstream->object.oid) : NULL);
 725        add_var(&script_snippet, "head_name",
 726                opts->head_name ? opts->head_name : "detached HEAD");
 727        add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
 728        add_var(&script_snippet, "onto", opts->onto ?
 729                oid_to_hex(&opts->onto->object.oid) : NULL);
 730        add_var(&script_snippet, "onto_name", opts->onto_name);
 731        add_var(&script_snippet, "revisions", opts->revisions);
 732        add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
 733                oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
 734        add_var(&script_snippet, "GIT_QUIET",
 735                opts->flags & REBASE_NO_QUIET ? "" : "t");
 736        sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
 737        add_var(&script_snippet, "git_am_opt", buf.buf);
 738        strbuf_release(&buf);
 739        add_var(&script_snippet, "verbose",
 740                opts->flags & REBASE_VERBOSE ? "t" : "");
 741        add_var(&script_snippet, "diffstat",
 742                opts->flags & REBASE_DIFFSTAT ? "t" : "");
 743        add_var(&script_snippet, "force_rebase",
 744                opts->flags & REBASE_FORCE ? "t" : "");
 745        if (opts->switch_to)
 746                add_var(&script_snippet, "switch_to", opts->switch_to);
 747        add_var(&script_snippet, "action", opts->action ? opts->action : "");
 748        add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
 749        add_var(&script_snippet, "allow_rerere_autoupdate",
 750                opts->allow_rerere_autoupdate < 0 ? "" :
 751                opts->allow_rerere_autoupdate ?
 752                "--rerere-autoupdate" : "--no-rerere-autoupdate");
 753        add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
 754        add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
 755        add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
 756        add_var(&script_snippet, "cmd", opts->cmd);
 757        add_var(&script_snippet, "allow_empty_message",
 758                opts->allow_empty_message ?  "--allow-empty-message" : "");
 759        add_var(&script_snippet, "rebase_merges",
 760                opts->rebase_merges ? "t" : "");
 761        add_var(&script_snippet, "rebase_cousins",
 762                opts->rebase_cousins ? "t" : "");
 763        add_var(&script_snippet, "strategy", opts->strategy);
 764        add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
 765        add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
 766        add_var(&script_snippet, "squash_onto",
 767                opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
 768        add_var(&script_snippet, "git_format_patch_opt",
 769                opts->git_format_patch_opt.buf);
 770
 771        if (is_interactive(opts) &&
 772            !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
 773                strbuf_addstr(&script_snippet,
 774                              "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
 775                opts->autosquash = 0;
 776        }
 777
 778        switch (opts->type) {
 779        case REBASE_AM:
 780                backend = "git-rebase--am";
 781                backend_func = "git_rebase__am";
 782                break;
 783        case REBASE_PRESERVE_MERGES:
 784                backend = "git-rebase--preserve-merges";
 785                backend_func = "git_rebase__preserve_merges";
 786                break;
 787        default:
 788                BUG("Unhandled rebase type %d", opts->type);
 789                break;
 790        }
 791
 792        strbuf_addf(&script_snippet,
 793                    ". git-sh-setup && . git-rebase--common &&"
 794                    " . %s && %s", backend, backend_func);
 795        argv[0] = script_snippet.buf;
 796
 797        status = run_command_v_opt(argv, RUN_USING_SHELL);
 798finished_rebase:
 799        if (opts->dont_finish_rebase)
 800                ; /* do nothing */
 801        else if (opts->type == REBASE_INTERACTIVE)
 802                ; /* interactive rebase cleans up after itself */
 803        else if (status == 0) {
 804                if (!file_exists(state_dir_path("stopped-sha", opts)))
 805                        finish_rebase(opts);
 806        } else if (status == 2) {
 807                struct strbuf dir = STRBUF_INIT;
 808
 809                apply_autostash(opts);
 810                strbuf_addstr(&dir, opts->state_dir);
 811                remove_dir_recursively(&dir, 0);
 812                strbuf_release(&dir);
 813                die("Nothing to do");
 814        }
 815
 816        strbuf_release(&script_snippet);
 817
 818        return status ? -1 : 0;
 819}
 820
 821static int rebase_config(const char *var, const char *value, void *data)
 822{
 823        struct rebase_options *opts = data;
 824
 825        if (!strcmp(var, "rebase.stat")) {
 826                if (git_config_bool(var, value))
 827                        opts->flags |= REBASE_DIFFSTAT;
 828                else
 829                        opts->flags &= !REBASE_DIFFSTAT;
 830                return 0;
 831        }
 832
 833        if (!strcmp(var, "rebase.autosquash")) {
 834                opts->autosquash = git_config_bool(var, value);
 835                return 0;
 836        }
 837
 838        if (!strcmp(var, "commit.gpgsign")) {
 839                free(opts->gpg_sign_opt);
 840                opts->gpg_sign_opt = git_config_bool(var, value) ?
 841                        xstrdup("-S") : NULL;
 842                return 0;
 843        }
 844
 845        if (!strcmp(var, "rebase.autostash")) {
 846                opts->autostash = git_config_bool(var, value);
 847                return 0;
 848        }
 849
 850        if (!strcmp(var, "rebase.reschedulefailedexec")) {
 851                opts->reschedule_failed_exec = git_config_bool(var, value);
 852                return 0;
 853        }
 854
 855        if (!strcmp(var, "rebase.usebuiltin")) {
 856                opts->use_legacy_rebase = !git_config_bool(var, value);
 857                return 0;
 858        }
 859
 860        return git_default_config(var, value, data);
 861}
 862
 863/*
 864 * Determines whether the commits in from..to are linear, i.e. contain
 865 * no merge commits. This function *expects* `from` to be an ancestor of
 866 * `to`.
 867 */
 868static int is_linear_history(struct commit *from, struct commit *to)
 869{
 870        while (to && to != from) {
 871                parse_commit(to);
 872                if (!to->parents)
 873                        return 1;
 874                if (to->parents->next)
 875                        return 0;
 876                to = to->parents->item;
 877        }
 878        return 1;
 879}
 880
 881static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
 882                            struct object_id *merge_base)
 883{
 884        struct commit *head = lookup_commit(the_repository, head_oid);
 885        struct commit_list *merge_bases;
 886        int res;
 887
 888        if (!head)
 889                return 0;
 890
 891        merge_bases = get_merge_bases(onto, head);
 892        if (merge_bases && !merge_bases->next) {
 893                oidcpy(merge_base, &merge_bases->item->object.oid);
 894                res = oideq(merge_base, &onto->object.oid);
 895        } else {
 896                oidcpy(merge_base, &null_oid);
 897                res = 0;
 898        }
 899        free_commit_list(merge_bases);
 900        return res && is_linear_history(onto, head);
 901}
 902
 903/* -i followed by -m is still -i */
 904static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
 905{
 906        struct rebase_options *opts = opt->value;
 907
 908        BUG_ON_OPT_NEG(unset);
 909        BUG_ON_OPT_ARG(arg);
 910
 911        if (!is_interactive(opts))
 912                opts->type = REBASE_MERGE;
 913
 914        return 0;
 915}
 916
 917/* -i followed by -p is still explicitly interactive, but -p alone is not */
 918static int parse_opt_interactive(const struct option *opt, const char *arg,
 919                                 int unset)
 920{
 921        struct rebase_options *opts = opt->value;
 922
 923        BUG_ON_OPT_NEG(unset);
 924        BUG_ON_OPT_ARG(arg);
 925
 926        opts->type = REBASE_INTERACTIVE;
 927        opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
 928
 929        return 0;
 930}
 931
 932static void NORETURN error_on_missing_default_upstream(void)
 933{
 934        struct branch *current_branch = branch_get(NULL);
 935
 936        printf(_("%s\n"
 937                 "Please specify which branch you want to rebase against.\n"
 938                 "See git-rebase(1) for details.\n"
 939                 "\n"
 940                 "    git rebase '<branch>'\n"
 941                 "\n"),
 942                current_branch ? _("There is no tracking information for "
 943                        "the current branch.") :
 944                        _("You are not currently on a branch."));
 945
 946        if (current_branch) {
 947                const char *remote = current_branch->remote_name;
 948
 949                if (!remote)
 950                        remote = _("<remote>");
 951
 952                printf(_("If you wish to set tracking information for this "
 953                         "branch you can do so with:\n"
 954                         "\n"
 955                         "    git branch --set-upstream-to=%s/<branch> %s\n"
 956                         "\n"),
 957                       remote, current_branch->name);
 958        }
 959        exit(1);
 960}
 961
 962static void set_reflog_action(struct rebase_options *options)
 963{
 964        const char *env;
 965        struct strbuf buf = STRBUF_INIT;
 966
 967        if (!is_interactive(options))
 968                return;
 969
 970        env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
 971        if (env && strcmp("rebase", env))
 972                return; /* only override it if it is "rebase" */
 973
 974        strbuf_addf(&buf, "rebase -i (%s)", options->action);
 975        setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
 976        strbuf_release(&buf);
 977}
 978
 979static int check_exec_cmd(const char *cmd)
 980{
 981        if (strchr(cmd, '\n'))
 982                return error(_("exec commands cannot contain newlines"));
 983
 984        /* Does the command consist purely of whitespace? */
 985        if (!cmd[strspn(cmd, " \t\r\f\v")])
 986                return error(_("empty exec command"));
 987
 988        return 0;
 989}
 990
 991
 992int cmd_rebase(int argc, const char **argv, const char *prefix)
 993{
 994        struct rebase_options options = {
 995                .type = REBASE_UNSPECIFIED,
 996                .flags = REBASE_NO_QUIET,
 997                .git_am_opts = ARGV_ARRAY_INIT,
 998                .allow_rerere_autoupdate  = -1,
 999                .allow_empty_message = 1,
1000                .git_format_patch_opt = STRBUF_INIT,
1001        };
1002        const char *branch_name;
1003        int ret, flags, total_argc, in_progress = 0;
1004        int ok_to_skip_pre_rebase = 0;
1005        struct strbuf msg = STRBUF_INIT;
1006        struct strbuf revisions = STRBUF_INIT;
1007        struct strbuf buf = STRBUF_INIT;
1008        struct object_id merge_base;
1009        enum {
1010                NO_ACTION,
1011                ACTION_CONTINUE,
1012                ACTION_SKIP,
1013                ACTION_ABORT,
1014                ACTION_QUIT,
1015                ACTION_EDIT_TODO,
1016                ACTION_SHOW_CURRENT_PATCH,
1017        } action = NO_ACTION;
1018        static const char *action_names[] = { N_("undefined"),
1019                                              N_("continue"),
1020                                              N_("skip"),
1021                                              N_("abort"),
1022                                              N_("quit"),
1023                                              N_("edit_todo"),
1024                                              N_("show_current_patch"),
1025                                              NULL };
1026        const char *gpg_sign = NULL;
1027        struct string_list exec = STRING_LIST_INIT_NODUP;
1028        const char *rebase_merges = NULL;
1029        int fork_point = -1;
1030        struct string_list strategy_options = STRING_LIST_INIT_NODUP;
1031        struct object_id squash_onto;
1032        char *squash_onto_name = NULL;
1033        struct option builtin_rebase_options[] = {
1034                OPT_STRING(0, "onto", &options.onto_name,
1035                           N_("revision"),
1036                           N_("rebase onto given branch instead of upstream")),
1037                OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
1038                         N_("allow pre-rebase hook to run")),
1039                OPT_NEGBIT('q', "quiet", &options.flags,
1040                           N_("be quiet. implies --no-stat"),
1041                           REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
1042                OPT_BIT('v', "verbose", &options.flags,
1043                        N_("display a diffstat of what changed upstream"),
1044                        REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
1045                {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
1046                        N_("do not show diffstat of what changed upstream"),
1047                        PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
1048                OPT_BOOL(0, "signoff", &options.signoff,
1049                         N_("add a Signed-off-by: line to each commit")),
1050                OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
1051                                  NULL, N_("passed to 'git am'"),
1052                                  PARSE_OPT_NOARG),
1053                OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
1054                                  &options.git_am_opts, NULL,
1055                                  N_("passed to 'git am'"), PARSE_OPT_NOARG),
1056                OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
1057                                  N_("passed to 'git am'"), PARSE_OPT_NOARG),
1058                OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
1059                                  N_("passed to 'git apply'"), 0),
1060                OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
1061                                  N_("action"), N_("passed to 'git apply'"), 0),
1062                OPT_BIT('f', "force-rebase", &options.flags,
1063                        N_("cherry-pick all commits, even if unchanged"),
1064                        REBASE_FORCE),
1065                OPT_BIT(0, "no-ff", &options.flags,
1066                        N_("cherry-pick all commits, even if unchanged"),
1067                        REBASE_FORCE),
1068                OPT_CMDMODE(0, "continue", &action, N_("continue"),
1069                            ACTION_CONTINUE),
1070                OPT_CMDMODE(0, "skip", &action,
1071                            N_("skip current patch and continue"), ACTION_SKIP),
1072                OPT_CMDMODE(0, "abort", &action,
1073                            N_("abort and check out the original branch"),
1074                            ACTION_ABORT),
1075                OPT_CMDMODE(0, "quit", &action,
1076                            N_("abort but keep HEAD where it is"), ACTION_QUIT),
1077                OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
1078                            "during an interactive rebase"), ACTION_EDIT_TODO),
1079                OPT_CMDMODE(0, "show-current-patch", &action,
1080                            N_("show the patch file being applied or merged"),
1081                            ACTION_SHOW_CURRENT_PATCH),
1082                { OPTION_CALLBACK, 'm', "merge", &options, NULL,
1083                        N_("use merging strategies to rebase"),
1084                        PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1085                        parse_opt_merge },
1086                { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
1087                        N_("let the user edit the list of commits to rebase"),
1088                        PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1089                        parse_opt_interactive },
1090                OPT_SET_INT('p', "preserve-merges", &options.type,
1091                            N_("(DEPRECATED) try to recreate merges instead of "
1092                               "ignoring them"), REBASE_PRESERVE_MERGES),
1093                OPT_BOOL(0, "rerere-autoupdate",
1094                         &options.allow_rerere_autoupdate,
1095                         N_("allow rerere to update index with resolved "
1096                            "conflict")),
1097                OPT_BOOL('k', "keep-empty", &options.keep_empty,
1098                         N_("preserve empty commits during rebase")),
1099                OPT_BOOL(0, "autosquash", &options.autosquash,
1100                         N_("move commits that begin with "
1101                            "squash!/fixup! under -i")),
1102                { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
1103                        N_("GPG-sign commits"),
1104                        PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
1105                OPT_BOOL(0, "autostash", &options.autostash,
1106                         N_("automatically stash/stash pop before and after")),
1107                OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
1108                                N_("add exec lines after each commit of the "
1109                                   "editable list")),
1110                OPT_BOOL(0, "allow-empty-message",
1111                         &options.allow_empty_message,
1112                         N_("allow rebasing commits with empty messages")),
1113                {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
1114                        N_("mode"),
1115                        N_("try to rebase merges instead of skipping them"),
1116                        PARSE_OPT_OPTARG, NULL, (intptr_t)""},
1117                OPT_BOOL(0, "fork-point", &fork_point,
1118                         N_("use 'merge-base --fork-point' to refine upstream")),
1119                OPT_STRING('s', "strategy", &options.strategy,
1120                           N_("strategy"), N_("use the given merge strategy")),
1121                OPT_STRING_LIST('X', "strategy-option", &strategy_options,
1122                                N_("option"),
1123                                N_("pass the argument through to the merge "
1124                                   "strategy")),
1125                OPT_BOOL(0, "root", &options.root,
1126                         N_("rebase all reachable commits up to the root(s)")),
1127                OPT_BOOL(0, "reschedule-failed-exec",
1128                         &options.reschedule_failed_exec,
1129                         N_("automatically re-schedule any `exec` that fails")),
1130                OPT_END(),
1131        };
1132        int i;
1133
1134        if (argc == 2 && !strcmp(argv[1], "-h"))
1135                usage_with_options(builtin_rebase_usage,
1136                                   builtin_rebase_options);
1137
1138        prefix = setup_git_directory();
1139        trace_repo_setup(prefix);
1140        setup_work_tree();
1141
1142        git_config(rebase_config, &options);
1143
1144        if (options.use_legacy_rebase ||
1145            !git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1))
1146                warning(_("the rebase.useBuiltin support has been removed!\n"
1147                          "See its entry in 'git help config' for details."));
1148
1149        strbuf_reset(&buf);
1150        strbuf_addf(&buf, "%s/applying", apply_dir());
1151        if(file_exists(buf.buf))
1152                die(_("It looks like 'git am' is in progress. Cannot rebase."));
1153
1154        if (is_directory(apply_dir())) {
1155                options.type = REBASE_AM;
1156                options.state_dir = apply_dir();
1157        } else if (is_directory(merge_dir())) {
1158                strbuf_reset(&buf);
1159                strbuf_addf(&buf, "%s/rewritten", merge_dir());
1160                if (is_directory(buf.buf)) {
1161                        options.type = REBASE_PRESERVE_MERGES;
1162                        options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1163                } else {
1164                        strbuf_reset(&buf);
1165                        strbuf_addf(&buf, "%s/interactive", merge_dir());
1166                        if(file_exists(buf.buf)) {
1167                                options.type = REBASE_INTERACTIVE;
1168                                options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1169                        } else
1170                                options.type = REBASE_MERGE;
1171                }
1172                options.state_dir = merge_dir();
1173        }
1174
1175        if (options.type != REBASE_UNSPECIFIED)
1176                in_progress = 1;
1177
1178        total_argc = argc;
1179        argc = parse_options(argc, argv, prefix,
1180                             builtin_rebase_options,
1181                             builtin_rebase_usage, 0);
1182
1183        if (action != NO_ACTION && total_argc != 2) {
1184                usage_with_options(builtin_rebase_usage,
1185                                   builtin_rebase_options);
1186        }
1187
1188        if (argc > 2)
1189                usage_with_options(builtin_rebase_usage,
1190                                   builtin_rebase_options);
1191
1192        if (options.type == REBASE_PRESERVE_MERGES)
1193                warning(_("git rebase --preserve-merges is deprecated. "
1194                          "Use --rebase-merges instead."));
1195
1196        if (action != NO_ACTION && !in_progress)
1197                die(_("No rebase in progress?"));
1198        setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
1199
1200        if (action == ACTION_EDIT_TODO && !is_interactive(&options))
1201                die(_("The --edit-todo action can only be used during "
1202                      "interactive rebase."));
1203
1204        if (trace2_is_enabled()) {
1205                if (is_interactive(&options))
1206                        trace2_cmd_mode("interactive");
1207                else if (exec.nr)
1208                        trace2_cmd_mode("interactive-exec");
1209                else
1210                        trace2_cmd_mode(action_names[action]);
1211        }
1212
1213        switch (action) {
1214        case ACTION_CONTINUE: {
1215                struct object_id head;
1216                struct lock_file lock_file = LOCK_INIT;
1217                int fd;
1218
1219                options.action = "continue";
1220                set_reflog_action(&options);
1221
1222                /* Sanity check */
1223                if (get_oid("HEAD", &head))
1224                        die(_("Cannot read HEAD"));
1225
1226                fd = hold_locked_index(&lock_file, 0);
1227                if (repo_read_index(the_repository) < 0)
1228                        die(_("could not read index"));
1229                refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1230                              NULL);
1231                if (0 <= fd)
1232                        repo_update_index_if_able(the_repository, &lock_file);
1233                rollback_lock_file(&lock_file);
1234
1235                if (has_unstaged_changes(the_repository, 1)) {
1236                        puts(_("You must edit all merge conflicts and then\n"
1237                               "mark them as resolved using git add"));
1238                        exit(1);
1239                }
1240                if (read_basic_state(&options))
1241                        exit(1);
1242                goto run_rebase;
1243        }
1244        case ACTION_SKIP: {
1245                struct string_list merge_rr = STRING_LIST_INIT_DUP;
1246
1247                options.action = "skip";
1248                set_reflog_action(&options);
1249
1250                rerere_clear(the_repository, &merge_rr);
1251                string_list_clear(&merge_rr, 1);
1252
1253                if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1254                               NULL, NULL) < 0)
1255                        die(_("could not discard worktree changes"));
1256                remove_branch_state(the_repository);
1257                if (read_basic_state(&options))
1258                        exit(1);
1259                goto run_rebase;
1260        }
1261        case ACTION_ABORT: {
1262                struct string_list merge_rr = STRING_LIST_INIT_DUP;
1263                options.action = "abort";
1264                set_reflog_action(&options);
1265
1266                rerere_clear(the_repository, &merge_rr);
1267                string_list_clear(&merge_rr, 1);
1268
1269                if (read_basic_state(&options))
1270                        exit(1);
1271                if (reset_head(&options.orig_head, "reset",
1272                               options.head_name, RESET_HEAD_HARD,
1273                               NULL, NULL) < 0)
1274                        die(_("could not move back to %s"),
1275                            oid_to_hex(&options.orig_head));
1276                remove_branch_state(the_repository);
1277                ret = finish_rebase(&options);
1278                goto cleanup;
1279        }
1280        case ACTION_QUIT: {
1281                strbuf_reset(&buf);
1282                strbuf_addstr(&buf, options.state_dir);
1283                ret = !!remove_dir_recursively(&buf, 0);
1284                if (ret)
1285                        die(_("could not remove '%s'"), options.state_dir);
1286                goto cleanup;
1287        }
1288        case ACTION_EDIT_TODO:
1289                options.action = "edit-todo";
1290                options.dont_finish_rebase = 1;
1291                goto run_rebase;
1292        case ACTION_SHOW_CURRENT_PATCH:
1293                options.action = "show-current-patch";
1294                options.dont_finish_rebase = 1;
1295                goto run_rebase;
1296        case NO_ACTION:
1297                break;
1298        default:
1299                BUG("action: %d", action);
1300        }
1301
1302        /* Make sure no rebase is in progress */
1303        if (in_progress) {
1304                const char *last_slash = strrchr(options.state_dir, '/');
1305                const char *state_dir_base =
1306                        last_slash ? last_slash + 1 : options.state_dir;
1307                const char *cmd_live_rebase =
1308                        "git rebase (--continue | --abort | --skip)";
1309                strbuf_reset(&buf);
1310                strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1311                die(_("It seems that there is already a %s directory, and\n"
1312                      "I wonder if you are in the middle of another rebase.  "
1313                      "If that is the\n"
1314                      "case, please try\n\t%s\n"
1315                      "If that is not the case, please\n\t%s\n"
1316                      "and run me again.  I am stopping in case you still "
1317                      "have something\n"
1318                      "valuable there.\n"),
1319                    state_dir_base, cmd_live_rebase, buf.buf);
1320        }
1321
1322        for (i = 0; i < options.git_am_opts.argc; i++) {
1323                const char *option = options.git_am_opts.argv[i], *p;
1324                if (!strcmp(option, "--committer-date-is-author-date") ||
1325                    !strcmp(option, "--ignore-date") ||
1326                    !strcmp(option, "--whitespace=fix") ||
1327                    !strcmp(option, "--whitespace=strip"))
1328                        options.flags |= REBASE_FORCE;
1329                else if (skip_prefix(option, "-C", &p)) {
1330                        while (*p)
1331                                if (!isdigit(*(p++)))
1332                                        die(_("switch `C' expects a "
1333                                              "numerical value"));
1334                } else if (skip_prefix(option, "--whitespace=", &p)) {
1335                        if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1336                            strcmp(p, "error") && strcmp(p, "error-all"))
1337                                die("Invalid whitespace option: '%s'", p);
1338                }
1339        }
1340
1341        for (i = 0; i < exec.nr; i++)
1342                if (check_exec_cmd(exec.items[i].string))
1343                        exit(1);
1344
1345        if (!(options.flags & REBASE_NO_QUIET))
1346                argv_array_push(&options.git_am_opts, "-q");
1347
1348        if (options.keep_empty)
1349                imply_interactive(&options, "--keep-empty");
1350
1351        if (gpg_sign) {
1352                free(options.gpg_sign_opt);
1353                options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1354        }
1355
1356        if (exec.nr) {
1357                int i;
1358
1359                imply_interactive(&options, "--exec");
1360
1361                strbuf_reset(&buf);
1362                for (i = 0; i < exec.nr; i++)
1363                        strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1364                options.cmd = xstrdup(buf.buf);
1365        }
1366
1367        if (rebase_merges) {
1368                if (!*rebase_merges)
1369                        ; /* default mode; do nothing */
1370                else if (!strcmp("rebase-cousins", rebase_merges))
1371                        options.rebase_cousins = 1;
1372                else if (strcmp("no-rebase-cousins", rebase_merges))
1373                        die(_("Unknown mode: %s"), rebase_merges);
1374                options.rebase_merges = 1;
1375                imply_interactive(&options, "--rebase-merges");
1376        }
1377
1378        if (strategy_options.nr) {
1379                int i;
1380
1381                if (!options.strategy)
1382                        options.strategy = "recursive";
1383
1384                strbuf_reset(&buf);
1385                for (i = 0; i < strategy_options.nr; i++)
1386                        strbuf_addf(&buf, " --%s",
1387                                    strategy_options.items[i].string);
1388                options.strategy_opts = xstrdup(buf.buf);
1389        }
1390
1391        if (options.strategy) {
1392                options.strategy = xstrdup(options.strategy);
1393                switch (options.type) {
1394                case REBASE_AM:
1395                        die(_("--strategy requires --merge or --interactive"));
1396                case REBASE_MERGE:
1397                case REBASE_INTERACTIVE:
1398                case REBASE_PRESERVE_MERGES:
1399                        /* compatible */
1400                        break;
1401                case REBASE_UNSPECIFIED:
1402                        options.type = REBASE_MERGE;
1403                        break;
1404                default:
1405                        BUG("unhandled rebase type (%d)", options.type);
1406                }
1407        }
1408
1409        if (options.type == REBASE_MERGE)
1410                imply_interactive(&options, "--merge");
1411
1412        if (options.root && !options.onto_name)
1413                imply_interactive(&options, "--root without --onto");
1414
1415        if (isatty(2) && options.flags & REBASE_NO_QUIET)
1416                strbuf_addstr(&options.git_format_patch_opt, " --progress");
1417
1418        switch (options.type) {
1419        case REBASE_MERGE:
1420        case REBASE_INTERACTIVE:
1421        case REBASE_PRESERVE_MERGES:
1422                options.state_dir = merge_dir();
1423                break;
1424        case REBASE_AM:
1425                options.state_dir = apply_dir();
1426                break;
1427        default:
1428                /* the default rebase backend is `--am` */
1429                options.type = REBASE_AM;
1430                options.state_dir = apply_dir();
1431                break;
1432        }
1433
1434        if (options.reschedule_failed_exec && !is_interactive(&options))
1435                die(_("%s requires an interactive rebase"), "--reschedule-failed-exec");
1436
1437        if (options.git_am_opts.argc) {
1438                /* all am options except -q are compatible only with --am */
1439                for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1440                        if (strcmp(options.git_am_opts.argv[i], "-q"))
1441                                break;
1442
1443                if (is_interactive(&options) && i >= 0)
1444                        die(_("cannot combine am options with either "
1445                              "interactive or merge options"));
1446        }
1447
1448        if (options.signoff) {
1449                if (options.type == REBASE_PRESERVE_MERGES)
1450                        die("cannot combine '--signoff' with "
1451                            "'--preserve-merges'");
1452                argv_array_push(&options.git_am_opts, "--signoff");
1453                options.flags |= REBASE_FORCE;
1454        }
1455
1456        if (options.type == REBASE_PRESERVE_MERGES) {
1457                /*
1458                 * Note: incompatibility with --signoff handled in signoff block above
1459                 * Note: incompatibility with --interactive is just a strong warning;
1460                 *       git-rebase.txt caveats with "unless you know what you are doing"
1461                 */
1462                if (options.rebase_merges)
1463                        die(_("cannot combine '--preserve-merges' with "
1464                              "'--rebase-merges'"));
1465
1466                if (options.reschedule_failed_exec)
1467                        die(_("error: cannot combine '--preserve-merges' with "
1468                              "'--reschedule-failed-exec'"));
1469        }
1470
1471        if (options.rebase_merges) {
1472                if (strategy_options.nr)
1473                        die(_("cannot combine '--rebase-merges' with "
1474                              "'--strategy-option'"));
1475                if (options.strategy)
1476                        die(_("cannot combine '--rebase-merges' with "
1477                              "'--strategy'"));
1478        }
1479
1480        if (!options.root) {
1481                if (argc < 1) {
1482                        struct branch *branch;
1483
1484                        branch = branch_get(NULL);
1485                        options.upstream_name = branch_get_upstream(branch,
1486                                                                    NULL);
1487                        if (!options.upstream_name)
1488                                error_on_missing_default_upstream();
1489                        if (fork_point < 0)
1490                                fork_point = 1;
1491                } else {
1492                        options.upstream_name = argv[0];
1493                        argc--;
1494                        argv++;
1495                        if (!strcmp(options.upstream_name, "-"))
1496                                options.upstream_name = "@{-1}";
1497                }
1498                options.upstream = peel_committish(options.upstream_name);
1499                if (!options.upstream)
1500                        die(_("invalid upstream '%s'"), options.upstream_name);
1501                options.upstream_arg = options.upstream_name;
1502        } else {
1503                if (!options.onto_name) {
1504                        if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1505                                        &squash_onto, NULL, NULL) < 0)
1506                                die(_("Could not create new root commit"));
1507                        options.squash_onto = &squash_onto;
1508                        options.onto_name = squash_onto_name =
1509                                xstrdup(oid_to_hex(&squash_onto));
1510                }
1511                options.upstream_name = NULL;
1512                options.upstream = NULL;
1513                if (argc > 1)
1514                        usage_with_options(builtin_rebase_usage,
1515                                           builtin_rebase_options);
1516                options.upstream_arg = "--root";
1517        }
1518
1519        /* Make sure the branch to rebase onto is valid. */
1520        if (!options.onto_name)
1521                options.onto_name = options.upstream_name;
1522        if (strstr(options.onto_name, "...")) {
1523                if (get_oid_mb(options.onto_name, &merge_base) < 0)
1524                        die(_("'%s': need exactly one merge base"),
1525                            options.onto_name);
1526                options.onto = lookup_commit_or_die(&merge_base,
1527                                                    options.onto_name);
1528        } else {
1529                options.onto = peel_committish(options.onto_name);
1530                if (!options.onto)
1531                        die(_("Does not point to a valid commit '%s'"),
1532                                options.onto_name);
1533        }
1534
1535        /*
1536         * If the branch to rebase is given, that is the branch we will rebase
1537         * branch_name -- branch/commit being rebased, or
1538         *                HEAD (already detached)
1539         * orig_head -- commit object name of tip of the branch before rebasing
1540         * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1541         */
1542        if (argc == 1) {
1543                /* Is it "rebase other branchname" or "rebase other commit"? */
1544                branch_name = argv[0];
1545                options.switch_to = argv[0];
1546
1547                /* Is it a local branch? */
1548                strbuf_reset(&buf);
1549                strbuf_addf(&buf, "refs/heads/%s", branch_name);
1550                if (!read_ref(buf.buf, &options.orig_head))
1551                        options.head_name = xstrdup(buf.buf);
1552                /* If not is it a valid ref (branch or commit)? */
1553                else if (!get_oid(branch_name, &options.orig_head))
1554                        options.head_name = NULL;
1555                else
1556                        die(_("fatal: no such branch/commit '%s'"),
1557                            branch_name);
1558        } else if (argc == 0) {
1559                /* Do not need to switch branches, we are already on it. */
1560                options.head_name =
1561                        xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1562                                         &flags));
1563                if (!options.head_name)
1564                        die(_("No such ref: %s"), "HEAD");
1565                if (flags & REF_ISSYMREF) {
1566                        if (!skip_prefix(options.head_name,
1567                                         "refs/heads/", &branch_name))
1568                                branch_name = options.head_name;
1569
1570                } else {
1571                        free(options.head_name);
1572                        options.head_name = NULL;
1573                        branch_name = "HEAD";
1574                }
1575                if (get_oid("HEAD", &options.orig_head))
1576                        die(_("Could not resolve HEAD to a revision"));
1577        } else
1578                BUG("unexpected number of arguments left to parse");
1579
1580        if (fork_point > 0) {
1581                struct commit *head =
1582                        lookup_commit_reference(the_repository,
1583                                                &options.orig_head);
1584                options.restrict_revision =
1585                        get_fork_point(options.upstream_name, head);
1586        }
1587
1588        if (repo_read_index(the_repository) < 0)
1589                die(_("could not read index"));
1590
1591        if (options.autostash) {
1592                struct lock_file lock_file = LOCK_INIT;
1593                int fd;
1594
1595                fd = hold_locked_index(&lock_file, 0);
1596                refresh_cache(REFRESH_QUIET);
1597                if (0 <= fd)
1598                        repo_update_index_if_able(the_repository, &lock_file);
1599                rollback_lock_file(&lock_file);
1600
1601                if (has_unstaged_changes(the_repository, 1) ||
1602                    has_uncommitted_changes(the_repository, 1)) {
1603                        const char *autostash =
1604                                state_dir_path("autostash", &options);
1605                        struct child_process stash = CHILD_PROCESS_INIT;
1606                        struct object_id oid;
1607                        struct commit *head =
1608                                lookup_commit_reference(the_repository,
1609                                                        &options.orig_head);
1610
1611                        argv_array_pushl(&stash.args,
1612                                         "stash", "create", "autostash", NULL);
1613                        stash.git_cmd = 1;
1614                        stash.no_stdin = 1;
1615                        strbuf_reset(&buf);
1616                        if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1617                                die(_("Cannot autostash"));
1618                        strbuf_trim_trailing_newline(&buf);
1619                        if (get_oid(buf.buf, &oid))
1620                                die(_("Unexpected stash response: '%s'"),
1621                                    buf.buf);
1622                        strbuf_reset(&buf);
1623                        strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1624
1625                        if (safe_create_leading_directories_const(autostash))
1626                                die(_("Could not create directory for '%s'"),
1627                                    options.state_dir);
1628                        write_file(autostash, "%s", oid_to_hex(&oid));
1629                        printf(_("Created autostash: %s\n"), buf.buf);
1630                        if (reset_head(&head->object.oid, "reset --hard",
1631                                       NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
1632                                die(_("could not reset --hard"));
1633                        printf(_("HEAD is now at %s"),
1634                               find_unique_abbrev(&head->object.oid,
1635                                                  DEFAULT_ABBREV));
1636                        strbuf_reset(&buf);
1637                        pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1638                        if (buf.len > 0)
1639                                printf(" %s", buf.buf);
1640                        putchar('\n');
1641
1642                        if (discard_index(the_repository->index) < 0 ||
1643                                repo_read_index(the_repository) < 0)
1644                                die(_("could not read index"));
1645                }
1646        }
1647
1648        if (require_clean_work_tree(the_repository, "rebase",
1649                                    _("Please commit or stash them."), 1, 1)) {
1650                ret = 1;
1651                goto cleanup;
1652        }
1653
1654        /*
1655         * Now we are rebasing commits upstream..orig_head (or with --root,
1656         * everything leading up to orig_head) on top of onto.
1657         */
1658
1659        /*
1660         * Check if we are already based on onto with linear history,
1661         * but this should be done only when upstream and onto are the same
1662         * and if this is not an interactive rebase.
1663         */
1664        if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1665            !is_interactive(&options) && !options.restrict_revision &&
1666            options.upstream &&
1667            !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1668                int flag;
1669
1670                if (!(options.flags & REBASE_FORCE)) {
1671                        /* Lazily switch to the target branch if needed... */
1672                        if (options.switch_to) {
1673                                struct object_id oid;
1674
1675                                if (get_oid(options.switch_to, &oid) < 0) {
1676                                        ret = !!error(_("could not parse '%s'"),
1677                                                      options.switch_to);
1678                                        goto cleanup;
1679                                }
1680
1681                                strbuf_reset(&buf);
1682                                strbuf_addf(&buf, "%s: checkout %s",
1683                                            getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
1684                                            options.switch_to);
1685                                if (reset_head(&oid, "checkout",
1686                                               options.head_name,
1687                                               RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1688                                               NULL, buf.buf) < 0) {
1689                                        ret = !!error(_("could not switch to "
1690                                                        "%s"),
1691                                                      options.switch_to);
1692                                        goto cleanup;
1693                                }
1694                        }
1695
1696                        if (!(options.flags & REBASE_NO_QUIET))
1697                                ; /* be quiet */
1698                        else if (!strcmp(branch_name, "HEAD") &&
1699                                 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1700                                puts(_("HEAD is up to date."));
1701                        else
1702                                printf(_("Current branch %s is up to date.\n"),
1703                                       branch_name);
1704                        ret = !!finish_rebase(&options);
1705                        goto cleanup;
1706                } else if (!(options.flags & REBASE_NO_QUIET))
1707                        ; /* be quiet */
1708                else if (!strcmp(branch_name, "HEAD") &&
1709                         resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1710                        puts(_("HEAD is up to date, rebase forced."));
1711                else
1712                        printf(_("Current branch %s is up to date, rebase "
1713                                 "forced.\n"), branch_name);
1714        }
1715
1716        /* If a hook exists, give it a chance to interrupt*/
1717        if (!ok_to_skip_pre_rebase &&
1718            run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1719                        argc ? argv[0] : NULL, NULL))
1720                die(_("The pre-rebase hook refused to rebase."));
1721
1722        if (options.flags & REBASE_DIFFSTAT) {
1723                struct diff_options opts;
1724
1725                if (options.flags & REBASE_VERBOSE) {
1726                        if (is_null_oid(&merge_base))
1727                                printf(_("Changes to %s:\n"),
1728                                       oid_to_hex(&options.onto->object.oid));
1729                        else
1730                                printf(_("Changes from %s to %s:\n"),
1731                                       oid_to_hex(&merge_base),
1732                                       oid_to_hex(&options.onto->object.oid));
1733                }
1734
1735                /* We want color (if set), but no pager */
1736                diff_setup(&opts);
1737                opts.stat_width = -1; /* use full terminal width */
1738                opts.stat_graph_width = -1; /* respect statGraphWidth config */
1739                opts.output_format |=
1740                        DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1741                opts.detect_rename = DIFF_DETECT_RENAME;
1742                diff_setup_done(&opts);
1743                diff_tree_oid(is_null_oid(&merge_base) ?
1744                              the_hash_algo->empty_tree : &merge_base,
1745                              &options.onto->object.oid, "", &opts);
1746                diffcore_std(&opts);
1747                diff_flush(&opts);
1748        }
1749
1750        if (is_interactive(&options))
1751                goto run_rebase;
1752
1753        /* Detach HEAD and reset the tree */
1754        if (options.flags & REBASE_NO_QUIET)
1755                printf(_("First, rewinding head to replay your work on top of "
1756                         "it...\n"));
1757
1758        strbuf_addf(&msg, "%s: checkout %s",
1759                    getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
1760        if (reset_head(&options.onto->object.oid, "checkout", NULL,
1761                       RESET_HEAD_DETACH | RESET_ORIG_HEAD | 
1762                       RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1763                       NULL, msg.buf))
1764                die(_("Could not detach HEAD"));
1765        strbuf_release(&msg);
1766
1767        /*
1768         * If the onto is a proper descendant of the tip of the branch, then
1769         * we just fast-forwarded.
1770         */
1771        strbuf_reset(&msg);
1772        if (!oidcmp(&merge_base, &options.orig_head)) {
1773                printf(_("Fast-forwarded %s to %s.\n"),
1774                        branch_name, options.onto_name);
1775                strbuf_addf(&msg, "rebase finished: %s onto %s",
1776                        options.head_name ? options.head_name : "detached HEAD",
1777                        oid_to_hex(&options.onto->object.oid));
1778                reset_head(NULL, "Fast-forwarded", options.head_name,
1779                           RESET_HEAD_REFS_ONLY, "HEAD", msg.buf);
1780                strbuf_release(&msg);
1781                ret = !!finish_rebase(&options);
1782                goto cleanup;
1783        }
1784
1785        strbuf_addf(&revisions, "%s..%s",
1786                    options.root ? oid_to_hex(&options.onto->object.oid) :
1787                    (options.restrict_revision ?
1788                     oid_to_hex(&options.restrict_revision->object.oid) :
1789                     oid_to_hex(&options.upstream->object.oid)),
1790                    oid_to_hex(&options.orig_head));
1791
1792        options.revisions = revisions.buf;
1793
1794run_rebase:
1795        ret = !!run_specific_rebase(&options);
1796
1797cleanup:
1798        strbuf_release(&revisions);
1799        free(options.head_name);
1800        free(options.gpg_sign_opt);
1801        free(options.cmd);
1802        free(squash_onto_name);
1803        return ret;
1804}