diff options
Diffstat (limited to 'builtin/rebase.c')
| -rw-r--r-- | builtin/rebase.c | 1583 |
1 files changed, 1583 insertions, 0 deletions
diff --git a/builtin/rebase.c b/builtin/rebase.c new file mode 100644 index 0000000000..b5c99ec10c --- /dev/null +++ b/builtin/rebase.c @@ -0,0 +1,1583 @@ +/* + * "git rebase" builtin command + * + * Copyright (c) 2018 Pratik Karki + */ + +#include "builtin.h" +#include "run-command.h" +#include "exec-cmd.h" +#include "argv-array.h" +#include "dir.h" +#include "packfile.h" +#include "refs.h" +#include "quote.h" +#include "config.h" +#include "cache-tree.h" +#include "unpack-trees.h" +#include "lockfile.h" +#include "parse-options.h" +#include "commit.h" +#include "diff.h" +#include "wt-status.h" +#include "revision.h" +#include "commit-reach.h" +#include "rerere.h" +#include "branch.h" + +static char const * const builtin_rebase_usage[] = { + N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] " + "[<upstream>] [<branch>]"), + N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] " + "--root [<branch>]"), + N_("git rebase --continue | --abort | --skip | --edit-todo"), + NULL +}; + +static GIT_PATH_FUNC(apply_dir, "rebase-apply") +static GIT_PATH_FUNC(merge_dir, "rebase-merge") + +enum rebase_type { + REBASE_UNSPECIFIED = -1, + REBASE_AM, + REBASE_MERGE, + REBASE_INTERACTIVE, + REBASE_PRESERVE_MERGES +}; + +static int use_builtin_rebase(void) +{ + struct child_process cp = CHILD_PROCESS_INIT; + struct strbuf out = STRBUF_INIT; + int ret, env = git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1); + + if (env != -1) + return env; + + argv_array_pushl(&cp.args, + "config", "--bool", "rebase.usebuiltin", NULL); + cp.git_cmd = 1; + if (capture_command(&cp, &out, 6)) { + strbuf_release(&out); + return 1; + } + + strbuf_trim(&out); + ret = !strcmp("true", out.buf); + strbuf_release(&out); + return ret; +} + +struct rebase_options { + enum rebase_type type; + const char *state_dir; + struct commit *upstream; + const char *upstream_name; + const char *upstream_arg; + char *head_name; + struct object_id orig_head; + struct commit *onto; + const char *onto_name; + const char *revisions; + const char *switch_to; + int root; + struct object_id *squash_onto; + struct commit *restrict_revision; + int dont_finish_rebase; + enum { + REBASE_NO_QUIET = 1<<0, + REBASE_VERBOSE = 1<<1, + REBASE_DIFFSTAT = 1<<2, + REBASE_FORCE = 1<<3, + REBASE_INTERACTIVE_EXPLICIT = 1<<4, + } flags; + struct argv_array git_am_opts; + const char *action; + int signoff; + int allow_rerere_autoupdate; + int keep_empty; + int autosquash; + char *gpg_sign_opt; + int autostash; + char *cmd; + int allow_empty_message; + int rebase_merges, rebase_cousins; + char *strategy, *strategy_opts; + struct strbuf git_format_patch_opt; +}; + +static int is_interactive(struct rebase_options *opts) +{ + return opts->type == REBASE_INTERACTIVE || + opts->type == REBASE_PRESERVE_MERGES; +} + +static void imply_interactive(struct rebase_options *opts, const char *option) +{ + switch (opts->type) { + case REBASE_AM: + die(_("%s requires an interactive rebase"), option); + break; + case REBASE_INTERACTIVE: + case REBASE_PRESERVE_MERGES: + break; + case REBASE_MERGE: + /* we silently *upgrade* --merge to --interactive if needed */ + default: + opts->type = REBASE_INTERACTIVE; /* implied */ + break; + } +} + +/* Returns the filename prefixed by the state_dir */ +static const char *state_dir_path(const char *filename, struct rebase_options *opts) +{ + static struct strbuf path = STRBUF_INIT; + static size_t prefix_len; + + if (!prefix_len) { + strbuf_addf(&path, "%s/", opts->state_dir); + prefix_len = path.len; + } + + strbuf_setlen(&path, prefix_len); + strbuf_addstr(&path, filename); + return path.buf; +} + +/* Read one file, then strip line endings */ +static int read_one(const char *path, struct strbuf *buf) +{ + if (strbuf_read_file(buf, path, 0) < 0) + return error_errno(_("could not read '%s'"), path); + strbuf_trim_trailing_newline(buf); + return 0; +} + +/* Initialize the rebase options from the state directory. */ +static int read_basic_state(struct rebase_options *opts) +{ + struct strbuf head_name = STRBUF_INIT; + struct strbuf buf = STRBUF_INIT; + struct object_id oid; + + if (read_one(state_dir_path("head-name", opts), &head_name) || + read_one(state_dir_path("onto", opts), &buf)) + return -1; + opts->head_name = starts_with(head_name.buf, "refs/") ? + xstrdup(head_name.buf) : NULL; + strbuf_release(&head_name); + if (get_oid(buf.buf, &oid)) + return error(_("could not get 'onto': '%s'"), buf.buf); + opts->onto = lookup_commit_or_die(&oid, buf.buf); + + /* + * We always write to orig-head, but interactive rebase used to write to + * head. Fall back to reading from head to cover for the case that the + * user upgraded git with an ongoing interactive rebase. + */ + strbuf_reset(&buf); + if (file_exists(state_dir_path("orig-head", opts))) { + if (read_one(state_dir_path("orig-head", opts), &buf)) + return -1; + } else if (read_one(state_dir_path("head", opts), &buf)) + return -1; + if (get_oid(buf.buf, &opts->orig_head)) + return error(_("invalid orig-head: '%s'"), buf.buf); + + strbuf_reset(&buf); + if (read_one(state_dir_path("quiet", opts), &buf)) + return -1; + if (buf.len) + opts->flags &= ~REBASE_NO_QUIET; + else + opts->flags |= REBASE_NO_QUIET; + + if (file_exists(state_dir_path("verbose", opts))) + opts->flags |= REBASE_VERBOSE; + + if (file_exists(state_dir_path("signoff", opts))) { + opts->signoff = 1; + opts->flags |= REBASE_FORCE; + } + + if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) { + strbuf_reset(&buf); + if (read_one(state_dir_path("allow_rerere_autoupdate", opts), + &buf)) + return -1; + if (!strcmp(buf.buf, "--rerere-autoupdate")) + opts->allow_rerere_autoupdate = 1; + else if (!strcmp(buf.buf, "--no-rerere-autoupdate")) + opts->allow_rerere_autoupdate = 0; + else + warning(_("ignoring invalid allow_rerere_autoupdate: " + "'%s'"), buf.buf); + } else + opts->allow_rerere_autoupdate = -1; + + if (file_exists(state_dir_path("gpg_sign_opt", opts))) { + strbuf_reset(&buf); + if (read_one(state_dir_path("gpg_sign_opt", opts), + &buf)) + return -1; + free(opts->gpg_sign_opt); + opts->gpg_sign_opt = xstrdup(buf.buf); + } + + if (file_exists(state_dir_path("strategy", opts))) { + strbuf_reset(&buf); + if (read_one(state_dir_path("strategy", opts), &buf)) + return -1; + free(opts->strategy); + opts->strategy = xstrdup(buf.buf); + } + + if (file_exists(state_dir_path("strategy_opts", opts))) { + strbuf_reset(&buf); + if (read_one(state_dir_path("strategy_opts", opts), &buf)) + return -1; + free(opts->strategy_opts); + opts->strategy_opts = xstrdup(buf.buf); + } + + strbuf_release(&buf); + + return 0; +} + +static int apply_autostash(struct rebase_options *opts) +{ + const char *path = state_dir_path("autostash", opts); + struct strbuf autostash = STRBUF_INIT; + struct child_process stash_apply = CHILD_PROCESS_INIT; + + if (!file_exists(path)) + return 0; + + if (read_one(path, &autostash)) + return error(_("Could not read '%s'"), path); + /* Ensure that the hash is not mistaken for a number */ + strbuf_addstr(&autostash, "^0"); + argv_array_pushl(&stash_apply.args, + "stash", "apply", autostash.buf, NULL); + stash_apply.git_cmd = 1; + stash_apply.no_stderr = stash_apply.no_stdout = + stash_apply.no_stdin = 1; + if (!run_command(&stash_apply)) + printf(_("Applied autostash.\n")); + else { + struct argv_array args = ARGV_ARRAY_INIT; + int res = 0; + + argv_array_pushl(&args, + "stash", "store", "-m", "autostash", "-q", + autostash.buf, NULL); + if (run_command_v_opt(args.argv, RUN_GIT_CMD)) + res = error(_("Cannot store %s"), autostash.buf); + argv_array_clear(&args); + strbuf_release(&autostash); + if (res) + return res; + + fprintf(stderr, + _("Applying autostash resulted in conflicts.\n" + "Your changes are safe in the stash.\n" + "You can run \"git stash pop\" or \"git stash drop\" " + "at any time.\n")); + } + + strbuf_release(&autostash); + return 0; +} + +static int finish_rebase(struct rebase_options *opts) +{ + struct strbuf dir = STRBUF_INIT; + const char *argv_gc_auto[] = { "gc", "--auto", NULL }; + + delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF); + apply_autostash(opts); + close_all_packs(the_repository->objects); + /* + * We ignore errors in 'gc --auto', since the + * user should see them. + */ + run_command_v_opt(argv_gc_auto, RUN_GIT_CMD); + strbuf_addstr(&dir, opts->state_dir); + remove_dir_recursively(&dir, 0); + strbuf_release(&dir); + + return 0; +} + +static struct commit *peel_committish(const char *name) +{ + struct object *obj; + struct object_id oid; + + if (get_oid(name, &oid)) + return NULL; + obj = parse_object(the_repository, &oid); + return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT); +} + +static void add_var(struct strbuf *buf, const char *name, const char *value) +{ + if (!value) + strbuf_addf(buf, "unset %s; ", name); + else { + strbuf_addf(buf, "%s=", name); + sq_quote_buf(buf, value); + strbuf_addstr(buf, "; "); + } +} + +static const char *resolvemsg = +N_("Resolve all conflicts manually, mark them as resolved with\n" +"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n" +"You can instead skip this commit: run \"git rebase --skip\".\n" +"To abort and get back to the state before \"git rebase\", run " +"\"git rebase --abort\"."); + +static int run_specific_rebase(struct rebase_options *opts) +{ + const char *argv[] = { NULL, NULL }; + struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT; + int status; + const char *backend, *backend_func; + + if (opts->type == REBASE_INTERACTIVE) { + /* Run builtin interactive rebase */ + struct child_process child = CHILD_PROCESS_INIT; + + argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s", + resolvemsg); + if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) { + argv_array_push(&child.env_array, "GIT_EDITOR=:"); + opts->autosquash = 0; + } + + child.git_cmd = 1; + argv_array_push(&child.args, "rebase--interactive"); + + if (opts->action) + argv_array_pushf(&child.args, "--%s", opts->action); + if (opts->keep_empty) + argv_array_push(&child.args, "--keep-empty"); + if (opts->rebase_merges) + argv_array_push(&child.args, "--rebase-merges"); + if (opts->rebase_cousins) + argv_array_push(&child.args, "--rebase-cousins"); + if (opts->autosquash) + argv_array_push(&child.args, "--autosquash"); + if (opts->flags & REBASE_VERBOSE) + argv_array_push(&child.args, "--verbose"); + if (opts->flags & REBASE_FORCE) + argv_array_push(&child.args, "--no-ff"); + if (opts->restrict_revision) + argv_array_pushf(&child.args, + "--restrict-revision=^%s", + oid_to_hex(&opts->restrict_revision->object.oid)); + if (opts->upstream) + argv_array_pushf(&child.args, "--upstream=%s", + oid_to_hex(&opts->upstream->object.oid)); + if (opts->onto) + argv_array_pushf(&child.args, "--onto=%s", + oid_to_hex(&opts->onto->object.oid)); + if (opts->squash_onto) + argv_array_pushf(&child.args, "--squash-onto=%s", + oid_to_hex(opts->squash_onto)); + if (opts->onto_name) + argv_array_pushf(&child.args, "--onto-name=%s", + opts->onto_name); + argv_array_pushf(&child.args, "--head-name=%s", + opts->head_name ? + opts->head_name : "detached HEAD"); + if (opts->strategy) + argv_array_pushf(&child.args, "--strategy=%s", + opts->strategy); + if (opts->strategy_opts) + argv_array_pushf(&child.args, "--strategy-opts=%s", + opts->strategy_opts); + if (opts->switch_to) + argv_array_pushf(&child.args, "--switch-to=%s", + opts->switch_to); + if (opts->cmd) + argv_array_pushf(&child.args, "--cmd=%s", opts->cmd); + if (opts->allow_empty_message) + argv_array_push(&child.args, "--allow-empty-message"); + if (opts->allow_rerere_autoupdate > 0) + argv_array_push(&child.args, "--rerere-autoupdate"); + else if (opts->allow_rerere_autoupdate == 0) + argv_array_push(&child.args, "--no-rerere-autoupdate"); + if (opts->gpg_sign_opt) + argv_array_push(&child.args, opts->gpg_sign_opt); + if (opts->signoff) + argv_array_push(&child.args, "--signoff"); + + status = run_command(&child); + goto finished_rebase; + } + + add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir())); + add_var(&script_snippet, "state_dir", opts->state_dir); + + add_var(&script_snippet, "upstream_name", opts->upstream_name); + add_var(&script_snippet, "upstream", opts->upstream ? + oid_to_hex(&opts->upstream->object.oid) : NULL); + add_var(&script_snippet, "head_name", + opts->head_name ? opts->head_name : "detached HEAD"); + add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head)); + add_var(&script_snippet, "onto", opts->onto ? + oid_to_hex(&opts->onto->object.oid) : NULL); + add_var(&script_snippet, "onto_name", opts->onto_name); + add_var(&script_snippet, "revisions", opts->revisions); + add_var(&script_snippet, "restrict_revision", opts->restrict_revision ? + oid_to_hex(&opts->restrict_revision->object.oid) : NULL); + add_var(&script_snippet, "GIT_QUIET", + opts->flags & REBASE_NO_QUIET ? "" : "t"); + sq_quote_argv_pretty(&buf, opts->git_am_opts.argv); + add_var(&script_snippet, "git_am_opt", buf.buf); + strbuf_release(&buf); + add_var(&script_snippet, "verbose", + opts->flags & REBASE_VERBOSE ? "t" : ""); + add_var(&script_snippet, "diffstat", + opts->flags & REBASE_DIFFSTAT ? "t" : ""); + add_var(&script_snippet, "force_rebase", + opts->flags & REBASE_FORCE ? "t" : ""); + if (opts->switch_to) + add_var(&script_snippet, "switch_to", opts->switch_to); + add_var(&script_snippet, "action", opts->action ? opts->action : ""); + add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : ""); + add_var(&script_snippet, "allow_rerere_autoupdate", + opts->allow_rerere_autoupdate < 0 ? "" : + opts->allow_rerere_autoupdate ? + "--rerere-autoupdate" : "--no-rerere-autoupdate"); + add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : ""); + add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : ""); + add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt); + add_var(&script_snippet, "cmd", opts->cmd); + add_var(&script_snippet, "allow_empty_message", + opts->allow_empty_message ? "--allow-empty-message" : ""); + add_var(&script_snippet, "rebase_merges", + opts->rebase_merges ? "t" : ""); + add_var(&script_snippet, "rebase_cousins", + opts->rebase_cousins ? "t" : ""); + add_var(&script_snippet, "strategy", opts->strategy); + add_var(&script_snippet, "strategy_opts", opts->strategy_opts); + add_var(&script_snippet, "rebase_root", opts->root ? "t" : ""); + add_var(&script_snippet, "squash_onto", + opts->squash_onto ? oid_to_hex(opts->squash_onto) : ""); + add_var(&script_snippet, "git_format_patch_opt", + opts->git_format_patch_opt.buf); + + if (is_interactive(opts) && + !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) { + strbuf_addstr(&script_snippet, + "GIT_EDITOR=:; export GIT_EDITOR; "); + opts->autosquash = 0; + } + + switch (opts->type) { + case REBASE_AM: + backend = "git-rebase--am"; + backend_func = "git_rebase__am"; + break; + case REBASE_MERGE: + backend = "git-rebase--merge"; + backend_func = "git_rebase__merge"; + break; + case REBASE_PRESERVE_MERGES: + backend = "git-rebase--preserve-merges"; + backend_func = "git_rebase__preserve_merges"; + break; + default: + BUG("Unhandled rebase type %d", opts->type); + break; + } + + strbuf_addf(&script_snippet, + ". git-sh-setup && . git-rebase--common &&" + " . %s && %s", backend, backend_func); + argv[0] = script_snippet.buf; + + status = run_command_v_opt(argv, RUN_USING_SHELL); +finished_rebase: + if (opts->dont_finish_rebase) + ; /* do nothing */ + else if (opts->type == REBASE_INTERACTIVE) + ; /* interactive rebase cleans up after itself */ + else if (status == 0) { + if (!file_exists(state_dir_path("stopped-sha", opts))) + finish_rebase(opts); + } else if (status == 2) { + struct strbuf dir = STRBUF_INIT; + + apply_autostash(opts); + strbuf_addstr(&dir, opts->state_dir); + remove_dir_recursively(&dir, 0); + strbuf_release(&dir); + die("Nothing to do"); + } + + strbuf_release(&script_snippet); + + return status ? -1 : 0; +} + +#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION" + +#define RESET_HEAD_DETACH (1<<0) +#define RESET_HEAD_HARD (1<<1) + +static int reset_head(struct object_id *oid, const char *action, + const char *switch_to_branch, unsigned flags, + const char *reflog_orig_head, const char *reflog_head) +{ + unsigned detach_head = flags & RESET_HEAD_DETACH; + unsigned reset_hard = flags & RESET_HEAD_HARD; + struct object_id head_oid; + struct tree_desc desc[2] = { { NULL }, { NULL } }; + struct lock_file lock = LOCK_INIT; + struct unpack_trees_options unpack_tree_opts; + struct tree *tree; + const char *reflog_action; + struct strbuf msg = STRBUF_INIT; + size_t prefix_len; + struct object_id *orig = NULL, oid_orig, + *old_orig = NULL, oid_old_orig; + int ret = 0, nr = 0; + + if (switch_to_branch && !starts_with(switch_to_branch, "refs/")) + BUG("Not a fully qualified branch: '%s'", switch_to_branch); + + if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) { + ret = -1; + goto leave_reset_head; + } + + if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) { + ret = error(_("could not determine HEAD revision")); + goto leave_reset_head; + } + + if (!oid) + oid = &head_oid; + + memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts)); + setup_unpack_trees_porcelain(&unpack_tree_opts, action); + unpack_tree_opts.head_idx = 1; + unpack_tree_opts.src_index = the_repository->index; + unpack_tree_opts.dst_index = the_repository->index; + unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge; + unpack_tree_opts.update = 1; + unpack_tree_opts.merge = 1; + if (!detach_head) + unpack_tree_opts.reset = 1; + + if (read_index_unmerged(the_repository->index) < 0) { + ret = error(_("could not read index")); + goto leave_reset_head; + } + + if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) { + ret = error(_("failed to find tree of %s"), + oid_to_hex(&head_oid)); + goto leave_reset_head; + } + + if (!fill_tree_descriptor(&desc[nr++], oid)) { + ret = error(_("failed to find tree of %s"), oid_to_hex(oid)); + goto leave_reset_head; + } + + if (unpack_trees(nr, desc, &unpack_tree_opts)) { + ret = -1; + goto leave_reset_head; + } + + tree = parse_tree_indirect(oid); + prime_cache_tree(the_repository->index, tree); + + if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) { + ret = error(_("could not write index")); + goto leave_reset_head; + } + + reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT); + strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase"); + prefix_len = msg.len; + + if (!get_oid("ORIG_HEAD", &oid_old_orig)) + old_orig = &oid_old_orig; + if (!get_oid("HEAD", &oid_orig)) { + orig = &oid_orig; + if (!reflog_orig_head) { + strbuf_addstr(&msg, "updating ORIG_HEAD"); + reflog_orig_head = msg.buf; + } + update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0, + UPDATE_REFS_MSG_ON_ERR); + } else if (old_orig) + delete_ref(NULL, "ORIG_HEAD", old_orig, 0); + if (!reflog_head) { + strbuf_setlen(&msg, prefix_len); + strbuf_addstr(&msg, "updating HEAD"); + reflog_head = msg.buf; + } + if (!switch_to_branch) + ret = update_ref(reflog_head, "HEAD", oid, orig, + detach_head ? REF_NO_DEREF : 0, + UPDATE_REFS_MSG_ON_ERR); + else { + ret = create_symref("HEAD", switch_to_branch, msg.buf); + if (!ret) + ret = update_ref(reflog_head, "HEAD", oid, NULL, 0, + UPDATE_REFS_MSG_ON_ERR); + } + +leave_reset_head: + strbuf_release(&msg); + rollback_lock_file(&lock); + while (nr) + free((void *)desc[--nr].buffer); + return ret; +} + +static int rebase_config(const char *var, const char *value, void *data) +{ + struct rebase_options *opts = data; + + if (!strcmp(var, "rebase.stat")) { + if (git_config_bool(var, value)) + opts->flags |= REBASE_DIFFSTAT; + else + opts->flags &= !REBASE_DIFFSTAT; + return 0; + } + + if (!strcmp(var, "rebase.autosquash")) { + opts->autosquash = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "commit.gpgsign")) { + free(opts->gpg_sign_opt); + opts->gpg_sign_opt = git_config_bool(var, value) ? + xstrdup("-S") : NULL; + return 0; + } + + if (!strcmp(var, "rebase.autostash")) { + opts->autostash = git_config_bool(var, value); + return 0; + } + + return git_default_config(var, value, data); +} + +/* + * Determines whether the commits in from..to are linear, i.e. contain + * no merge commits. This function *expects* `from` to be an ancestor of + * `to`. + */ +static int is_linear_history(struct commit *from, struct commit *to) +{ + while (to && to != from) { + parse_commit(to); + if (!to->parents) + return 1; + if (to->parents->next) + return 0; + to = to->parents->item; + } + return 1; +} + +static int can_fast_forward(struct commit *onto, struct object_id *head_oid, + struct object_id *merge_base) +{ + struct commit *head = lookup_commit(the_repository, head_oid); + struct commit_list *merge_bases; + int res; + + if (!head) + return 0; + + merge_bases = get_merge_bases(onto, head); + if (merge_bases && !merge_bases->next) { + oidcpy(merge_base, &merge_bases->item->object.oid); + res = oideq(merge_base, &onto->object.oid); + } else { + oidcpy(merge_base, &null_oid); + res = 0; + } + free_commit_list(merge_bases); + return res && is_linear_history(onto, head); +} + +/* -i followed by -m is still -i */ +static int parse_opt_merge(const struct option *opt, const char *arg, int unset) +{ + struct rebase_options *opts = opt->value; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(arg); + + if (!is_interactive(opts)) + opts->type = REBASE_MERGE; + + return 0; +} + +/* -i followed by -p is still explicitly interactive, but -p alone is not */ +static int parse_opt_interactive(const struct option *opt, const char *arg, + int unset) +{ + struct rebase_options *opts = opt->value; + + BUG_ON_OPT_NEG(unset); + BUG_ON_OPT_ARG(arg); + + opts->type = REBASE_INTERACTIVE; + opts->flags |= REBASE_INTERACTIVE_EXPLICIT; + + return 0; +} + +static void NORETURN error_on_missing_default_upstream(void) +{ + struct branch *current_branch = branch_get(NULL); + + printf(_("%s\n" + "Please specify which branch you want to rebase against.\n" + "See git-rebase(1) for details.\n" + "\n" + " git rebase '<branch>'\n" + "\n"), + current_branch ? _("There is no tracking information for " + "the current branch.") : + _("You are not currently on a branch.")); + + if (current_branch) { + const char *remote = current_branch->remote_name; + + if (!remote) + remote = _("<remote>"); + + printf(_("If you wish to set tracking information for this " + "branch you can do so with:\n" + "\n" + " git branch --set-upstream-to=%s/<branch> %s\n" + "\n"), + remote, current_branch->name); + } + exit(1); +} + +static void set_reflog_action(struct rebase_options *options) +{ + const char *env; + struct strbuf buf = STRBUF_INIT; + + if (!is_interactive(options)) + return; + + env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT); + if (env && strcmp("rebase", env)) + return; /* only override it if it is "rebase" */ + + strbuf_addf(&buf, "rebase -i (%s)", options->action); + setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1); + strbuf_release(&buf); +} + +int cmd_rebase(int argc, const char **argv, const char *prefix) +{ + struct rebase_options options = { + .type = REBASE_UNSPECIFIED, + .flags = REBASE_NO_QUIET, + .git_am_opts = ARGV_ARRAY_INIT, + .allow_rerere_autoupdate = -1, + .allow_empty_message = 1, + .git_format_patch_opt = STRBUF_INIT, + }; + const char *branch_name; + int ret, flags, total_argc, in_progress = 0; + int ok_to_skip_pre_rebase = 0; + struct strbuf msg = STRBUF_INIT; + struct strbuf revisions = STRBUF_INIT; + struct strbuf buf = STRBUF_INIT; + struct object_id merge_base; + enum { + NO_ACTION, + ACTION_CONTINUE, + ACTION_SKIP, + ACTION_ABORT, + ACTION_QUIT, + ACTION_EDIT_TODO, + ACTION_SHOW_CURRENT_PATCH, + } action = NO_ACTION; + const char *gpg_sign = NULL; + struct string_list exec = STRING_LIST_INIT_NODUP; + const char *rebase_merges = NULL; + int fork_point = -1; + struct string_list strategy_options = STRING_LIST_INIT_NODUP; + struct object_id squash_onto; + char *squash_onto_name = NULL; + struct option builtin_rebase_options[] = { + OPT_STRING(0, "onto", &options.onto_name, + N_("revision"), + N_("rebase onto given branch instead of upstream")), + OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase, + N_("allow pre-rebase hook to run")), + OPT_NEGBIT('q', "quiet", &options.flags, + N_("be quiet. implies --no-stat"), + REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT), + OPT_BIT('v', "verbose", &options.flags, + N_("display a diffstat of what changed upstream"), + REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT), + {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL, + N_("do not show diffstat of what changed upstream"), + PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT }, + OPT_BOOL(0, "signoff", &options.signoff, + N_("add a Signed-off-by: line to each commit")), + OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts, + NULL, N_("passed to 'git am'"), + PARSE_OPT_NOARG), + OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date", + &options.git_am_opts, NULL, + N_("passed to 'git am'"), PARSE_OPT_NOARG), + OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL, + N_("passed to 'git am'"), PARSE_OPT_NOARG), + OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"), + N_("passed to 'git apply'"), 0), + OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts, + N_("action"), N_("passed to 'git apply'"), 0), + OPT_BIT('f', "force-rebase", &options.flags, + N_("cherry-pick all commits, even if unchanged"), + REBASE_FORCE), + OPT_BIT(0, "no-ff", &options.flags, + N_("cherry-pick all commits, even if unchanged"), + REBASE_FORCE), + OPT_CMDMODE(0, "continue", &action, N_("continue"), + ACTION_CONTINUE), + OPT_CMDMODE(0, "skip", &action, + N_("skip current patch and continue"), ACTION_SKIP), + OPT_CMDMODE(0, "abort", &action, + N_("abort and check out the original branch"), + ACTION_ABORT), + OPT_CMDMODE(0, "quit", &action, + N_("abort but keep HEAD where it is"), ACTION_QUIT), + OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list " + "during an interactive rebase"), ACTION_EDIT_TODO), + OPT_CMDMODE(0, "show-current-patch", &action, + N_("show the patch file being applied or merged"), + ACTION_SHOW_CURRENT_PATCH), + { OPTION_CALLBACK, 'm', "merge", &options, NULL, + N_("use merging strategies to rebase"), + PARSE_OPT_NOARG | PARSE_OPT_NONEG, + parse_opt_merge }, + { OPTION_CALLBACK, 'i', "interactive", &options, NULL, + N_("let the user edit the list of commits to rebase"), + PARSE_OPT_NOARG | PARSE_OPT_NONEG, + parse_opt_interactive }, + OPT_SET_INT('p', "preserve-merges", &options.type, + N_("try to recreate merges instead of ignoring " + "them"), REBASE_PRESERVE_MERGES), + OPT_BOOL(0, "rerere-autoupdate", + &options.allow_rerere_autoupdate, + N_("allow rerere to update index with resolved " + "conflict")), + OPT_BOOL('k', "keep-empty", &options.keep_empty, + N_("preserve empty commits during rebase")), + OPT_BOOL(0, "autosquash", &options.autosquash, + N_("move commits that begin with " + "squash!/fixup! under -i")), + { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"), + N_("GPG-sign commits"), + PARSE_OPT_OPTARG, NULL, (intptr_t) "" }, + OPT_BOOL(0, "autostash", &options.autostash, + N_("automatically stash/stash pop before and after")), + OPT_STRING_LIST('x', "exec", &exec, N_("exec"), + N_("add exec lines after each commit of the " + "editable list")), + OPT_BOOL(0, "allow-empty-message", + &options.allow_empty_message, + N_("allow rebasing commits with empty messages")), + {OPTION_STRING, 'r', "rebase-merges", &rebase_merges, + N_("mode"), + N_("try to rebase merges instead of skipping them"), + PARSE_OPT_OPTARG, NULL, (intptr_t)""}, + OPT_BOOL(0, "fork-point", &fork_point, + N_("use 'merge-base --fork-point' to refine upstream")), + OPT_STRING('s', "strategy", &options.strategy, + N_("strategy"), N_("use the given merge strategy")), + OPT_STRING_LIST('X', "strategy-option", &strategy_options, + N_("option"), + N_("pass the argument through to the merge " + "strategy")), + OPT_BOOL(0, "root", &options.root, + N_("rebase all reachable commits up to the root(s)")), + OPT_END(), + }; + int i; + + /* + * NEEDSWORK: Once the builtin rebase has been tested enough + * and git-legacy-rebase.sh is retired to contrib/, this preamble + * can be removed. + */ + + if (!use_builtin_rebase()) { + const char *path = mkpath("%s/git-legacy-rebase", + git_exec_path()); + + if (sane_execvp(path, (char **)argv) < 0) + die_errno(_("could not exec %s"), path); + else + BUG("sane_execvp() returned???"); + } + + if (argc == 2 && !strcmp(argv[1], "-h")) + usage_with_options(builtin_rebase_usage, + builtin_rebase_options); + + prefix = setup_git_directory(); + trace_repo_setup(prefix); + setup_work_tree(); + + git_config(rebase_config, &options); + + strbuf_reset(&buf); + strbuf_addf(&buf, "%s/applying", apply_dir()); + if(file_exists(buf.buf)) + die(_("It looks like 'git am' is in progress. Cannot rebase.")); + + if (is_directory(apply_dir())) { + options.type = REBASE_AM; + options.state_dir = apply_dir(); + } else if (is_directory(merge_dir())) { + strbuf_reset(&buf); + strbuf_addf(&buf, "%s/rewritten", merge_dir()); + if (is_directory(buf.buf)) { + options.type = REBASE_PRESERVE_MERGES; + options.flags |= REBASE_INTERACTIVE_EXPLICIT; + } else { + strbuf_reset(&buf); + strbuf_addf(&buf, "%s/interactive", merge_dir()); + if(file_exists(buf.buf)) { + options.type = REBASE_INTERACTIVE; + options.flags |= REBASE_INTERACTIVE_EXPLICIT; + } else + options.type = REBASE_MERGE; + } + options.state_dir = merge_dir(); + } + + if (options.type != REBASE_UNSPECIFIED) + in_progress = 1; + + total_argc = argc; + argc = parse_options(argc, argv, prefix, + builtin_rebase_options, + builtin_rebase_usage, 0); + + if (action != NO_ACTION && total_argc != 2) { + usage_with_options(builtin_rebase_usage, + builtin_rebase_options); + } + + if (argc > 2) + usage_with_options(builtin_rebase_usage, + builtin_rebase_options); + + if (action != NO_ACTION && !in_progress) + die(_("No rebase in progress?")); + setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0); + + if (action == ACTION_EDIT_TODO && !is_interactive(&options)) + die(_("The --edit-todo action can only be used during " + "interactive rebase.")); + + switch (action) { + case ACTION_CONTINUE: { + struct object_id head; + struct lock_file lock_file = LOCK_INIT; + int fd; + + options.action = "continue"; + set_reflog_action(&options); + + /* Sanity check */ + if (get_oid("HEAD", &head)) + die(_("Cannot read HEAD")); + + fd = hold_locked_index(&lock_file, 0); + if (read_index(the_repository->index) < 0) + die(_("could not read index")); + refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL, + NULL); + if (0 <= fd) + update_index_if_able(the_repository->index, + &lock_file); + rollback_lock_file(&lock_file); + + if (has_unstaged_changes(1)) { + puts(_("You must edit all merge conflicts and then\n" + "mark them as resolved using git add")); + exit(1); + } + if (read_basic_state(&options)) + exit(1); + goto run_rebase; + } + case ACTION_SKIP: { + struct string_list merge_rr = STRING_LIST_INIT_DUP; + + options.action = "skip"; + set_reflog_action(&options); + + rerere_clear(&merge_rr); + string_list_clear(&merge_rr, 1); + + if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD, + NULL, NULL) < 0) + die(_("could not discard worktree changes")); + remove_branch_state(); + if (read_basic_state(&options)) + exit(1); + goto run_rebase; + } + case ACTION_ABORT: { + struct string_list merge_rr = STRING_LIST_INIT_DUP; + options.action = "abort"; + set_reflog_action(&options); + + rerere_clear(&merge_rr); + string_list_clear(&merge_rr, 1); + + if (read_basic_state(&options)) + exit(1); + if (reset_head(&options.orig_head, "reset", + options.head_name, RESET_HEAD_HARD, + NULL, NULL) < 0) + die(_("could not move back to %s"), + oid_to_hex(&options.orig_head)); + remove_branch_state(); + ret = finish_rebase(&options); + goto cleanup; + } + case ACTION_QUIT: { + strbuf_reset(&buf); + strbuf_addstr(&buf, options.state_dir); + ret = !!remove_dir_recursively(&buf, 0); + if (ret) + die(_("could not remove '%s'"), options.state_dir); + goto cleanup; + } + case ACTION_EDIT_TODO: + options.action = "edit-todo"; + options.dont_finish_rebase = 1; + goto run_rebase; + case ACTION_SHOW_CURRENT_PATCH: + options.action = "show-current-patch"; + options.dont_finish_rebase = 1; + goto run_rebase; + case NO_ACTION: + break; + default: + BUG("action: %d", action); + } + + /* Make sure no rebase is in progress */ + if (in_progress) { + const char *last_slash = strrchr(options.state_dir, '/'); + const char *state_dir_base = + last_slash ? last_slash + 1 : options.state_dir; + const char *cmd_live_rebase = + "git rebase (--continue | --abort | --skip)"; + strbuf_reset(&buf); + strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir); + die(_("It seems that there is already a %s directory, and\n" + "I wonder if you are in the middle of another rebase. " + "If that is the\n" + "case, please try\n\t%s\n" + "If that is not the case, please\n\t%s\n" + "and run me again. I am stopping in case you still " + "have something\n" + "valuable there.\n"), + state_dir_base, cmd_live_rebase, buf.buf); + } + + for (i = 0; i < options.git_am_opts.argc; i++) { + const char *option = options.git_am_opts.argv[i], *p; + if (!strcmp(option, "--committer-date-is-author-date") || + !strcmp(option, "--ignore-date") || + !strcmp(option, "--whitespace=fix") || + !strcmp(option, "--whitespace=strip")) + options.flags |= REBASE_FORCE; + else if (skip_prefix(option, "-C", &p)) { + while (*p) + if (!isdigit(*(p++))) + die(_("switch `C' expects a " + "numerical value")); + } else if (skip_prefix(option, "--whitespace=", &p)) { + if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") && + strcmp(p, "error") && strcmp(p, "error-all")) + die("Invalid whitespace option: '%s'", p); + } + } + + if (!(options.flags & REBASE_NO_QUIET)) + argv_array_push(&options.git_am_opts, "-q"); + + if (options.keep_empty) + imply_interactive(&options, "--keep-empty"); + + if (gpg_sign) { + free(options.gpg_sign_opt); + options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign); + } + + if (exec.nr) { + int i; + + imply_interactive(&options, "--exec"); + + strbuf_reset(&buf); + for (i = 0; i < exec.nr; i++) + strbuf_addf(&buf, "exec %s\n", exec.items[i].string); + options.cmd = xstrdup(buf.buf); + } + + if (rebase_merges) { + if (!*rebase_merges) + ; /* default mode; do nothing */ + else if (!strcmp("rebase-cousins", rebase_merges)) + options.rebase_cousins = 1; + else if (strcmp("no-rebase-cousins", rebase_merges)) + die(_("Unknown mode: %s"), rebase_merges); + options.rebase_merges = 1; + imply_interactive(&options, "--rebase-merges"); + } + + if (strategy_options.nr) { + int i; + + if (!options.strategy) + options.strategy = "recursive"; + + strbuf_reset(&buf); + for (i = 0; i < strategy_options.nr; i++) + strbuf_addf(&buf, " --%s", + strategy_options.items[i].string); + options.strategy_opts = xstrdup(buf.buf); + } + + if (options.strategy) { + options.strategy = xstrdup(options.strategy); + switch (options.type) { + case REBASE_AM: + die(_("--strategy requires --merge or --interactive")); + case REBASE_MERGE: + case REBASE_INTERACTIVE: + case REBASE_PRESERVE_MERGES: + /* compatible */ + break; + case REBASE_UNSPECIFIED: + options.type = REBASE_MERGE; + break; + default: + BUG("unhandled rebase type (%d)", options.type); + } + } + + if (options.root && !options.onto_name) + imply_interactive(&options, "--root without --onto"); + + if (isatty(2) && options.flags & REBASE_NO_QUIET) + strbuf_addstr(&options.git_format_patch_opt, " --progress"); + + switch (options.type) { + case REBASE_MERGE: + case REBASE_INTERACTIVE: + case REBASE_PRESERVE_MERGES: + options.state_dir = merge_dir(); + break; + case REBASE_AM: + options.state_dir = apply_dir(); + break; + default: + /* the default rebase backend is `--am` */ + options.type = REBASE_AM; + options.state_dir = apply_dir(); + break; + } + + if (options.git_am_opts.argc) { + /* all am options except -q are compatible only with --am */ + for (i = options.git_am_opts.argc - 1; i >= 0; i--) + if (strcmp(options.git_am_opts.argv[i], "-q")) + break; + + if (is_interactive(&options) && i >= 0) + die(_("error: cannot combine interactive options " + "(--interactive, --exec, --rebase-merges, " + "--preserve-merges, --keep-empty, --root + " + "--onto) with am options (%s)"), buf.buf); + if (options.type == REBASE_MERGE && i >= 0) + die(_("error: cannot combine merge options (--merge, " + "--strategy, --strategy-option) with am options " + "(%s)"), buf.buf); + } + + if (options.signoff) { + if (options.type == REBASE_PRESERVE_MERGES) + die("cannot combine '--signoff' with " + "'--preserve-merges'"); + argv_array_push(&options.git_am_opts, "--signoff"); + options.flags |= REBASE_FORCE; + } + + if (options.type == REBASE_PRESERVE_MERGES) + /* + * Note: incompatibility with --signoff handled in signoff block above + * Note: incompatibility with --interactive is just a strong warning; + * git-rebase.txt caveats with "unless you know what you are doing" + */ + if (options.rebase_merges) + die(_("error: cannot combine '--preserve-merges' with " + "'--rebase-merges'")); + + if (options.rebase_merges) { + if (strategy_options.nr) + die(_("error: cannot combine '--rebase-merges' with " + "'--strategy-option'")); + if (options.strategy) + die(_("error: cannot combine '--rebase-merges' with " + "'--strategy'")); + } + + if (!options.root) { + if (argc < 1) { + struct branch *branch; + + branch = branch_get(NULL); + options.upstream_name = branch_get_upstream(branch, + NULL); + if (!options.upstream_name) + error_on_missing_default_upstream(); + if (fork_point < 0) + fork_point = 1; + } else { + options.upstream_name = argv[0]; + argc--; + argv++; + if (!strcmp(options.upstream_name, "-")) + options.upstream_name = "@{-1}"; + } + options.upstream = peel_committish(options.upstream_name); + if (!options.upstream) + die(_("invalid upstream '%s'"), options.upstream_name); + options.upstream_arg = options.upstream_name; + } else { + if (!options.onto_name) { + if (commit_tree("", 0, the_hash_algo->empty_tree, NULL, + &squash_onto, NULL, NULL) < 0) + die(_("Could not create new root commit")); + options.squash_onto = &squash_onto; + options.onto_name = squash_onto_name = + xstrdup(oid_to_hex(&squash_onto)); + } + options.upstream_name = NULL; + options.upstream = NULL; + if (argc > 1) + usage_with_options(builtin_rebase_usage, + builtin_rebase_options); + options.upstream_arg = "--root"; + } + + /* Make sure the branch to rebase onto is valid. */ + if (!options.onto_name) + options.onto_name = options.upstream_name; + if (strstr(options.onto_name, "...")) { + if (get_oid_mb(options.onto_name, &merge_base) < 0) + die(_("'%s': need exactly one merge base"), + options.onto_name); + options.onto = lookup_commit_or_die(&merge_base, + options.onto_name); + } else { + options.onto = peel_committish(options.onto_name); + if (!options.onto) + die(_("Does not point to a valid commit '%s'"), + options.onto_name); + } + + /* + * If the branch to rebase is given, that is the branch we will rebase + * branch_name -- branch/commit being rebased, or + * HEAD (already detached) + * orig_head -- commit object name of tip of the branch before rebasing + * head_name -- refs/heads/<that-branch> or NULL (detached HEAD) + */ + if (argc == 1) { + /* Is it "rebase other branchname" or "rebase other commit"? */ + branch_name = argv[0]; + options.switch_to = argv[0]; + + /* Is it a local branch? */ + strbuf_reset(&buf); + strbuf_addf(&buf, "refs/heads/%s", branch_name); + if (!read_ref(buf.buf, &options.orig_head)) + options.head_name = xstrdup(buf.buf); + /* If not is it a valid ref (branch or commit)? */ + else if (!get_oid(branch_name, &options.orig_head)) + options.head_name = NULL; + else + die(_("fatal: no such branch/commit '%s'"), + branch_name); + } else if (argc == 0) { + /* Do not need to switch branches, we are already on it. */ + options.head_name = + xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL, + &flags)); + if (!options.head_name) + die(_("No such ref: %s"), "HEAD"); + if (flags & REF_ISSYMREF) { + if (!skip_prefix(options.head_name, + "refs/heads/", &branch_name)) + branch_name = options.head_name; + + } else { + free(options.head_name); + options.head_name = NULL; + branch_name = "HEAD"; + } + if (get_oid("HEAD", &options.orig_head)) + die(_("Could not resolve HEAD to a revision")); + } else + BUG("unexpected number of arguments left to parse"); + + if (fork_point > 0) { + struct commit *head = + lookup_commit_reference(the_repository, + &options.orig_head); + options.restrict_revision = + get_fork_point(options.upstream_name, head); + } + + if (read_index(the_repository->index) < 0) + die(_("could not read index")); + + if (options.autostash) { + struct lock_file lock_file = LOCK_INIT; + int fd; + + fd = hold_locked_index(&lock_file, 0); + refresh_cache(REFRESH_QUIET); + if (0 <= fd) + update_index_if_able(&the_index, &lock_file); + rollback_lock_file(&lock_file); + + if (has_unstaged_changes(1) || has_uncommitted_changes(1)) { + const char *autostash = + state_dir_path("autostash", &options); + struct child_process stash = CHILD_PROCESS_INIT; + struct object_id oid; + struct commit *head = + lookup_commit_reference(the_repository, + &options.orig_head); + + argv_array_pushl(&stash.args, + "stash", "create", "autostash", NULL); + stash.git_cmd = 1; + stash.no_stdin = 1; + strbuf_reset(&buf); + if (capture_command(&stash, &buf, GIT_MAX_HEXSZ)) + die(_("Cannot autostash")); + strbuf_trim_trailing_newline(&buf); + if (get_oid(buf.buf, &oid)) + die(_("Unexpected stash response: '%s'"), + buf.buf); + strbuf_reset(&buf); + strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV); + + if (safe_create_leading_directories_const(autostash)) + die(_("Could not create directory for '%s'"), + options.state_dir); + write_file(autostash, "%s", oid_to_hex(&oid)); + printf(_("Created autostash: %s\n"), buf.buf); + if (reset_head(&head->object.oid, "reset --hard", + NULL, RESET_HEAD_HARD, NULL, NULL) < 0) + die(_("could not reset --hard")); + printf(_("HEAD is now at %s"), + find_unique_abbrev(&head->object.oid, + DEFAULT_ABBREV)); + strbuf_reset(&buf); + pp_commit_easy(CMIT_FMT_ONELINE, head, &buf); + if (buf.len > 0) + printf(" %s", buf.buf); + putchar('\n'); + + if (discard_index(the_repository->index) < 0 || + read_index(the_repository->index) < 0) + die(_("could not read index")); + } + } + + if (require_clean_work_tree("rebase", + _("Please commit or stash them."), 1, 1)) { + ret = 1; + goto cleanup; + } + + /* + * Now we are rebasing commits upstream..orig_head (or with --root, + * everything leading up to orig_head) on top of onto. + */ + + /* + * Check if we are already based on onto with linear history, + * but this should be done only when upstream and onto are the same + * and if this is not an interactive rebase. + */ + if (can_fast_forward(options.onto, &options.orig_head, &merge_base) && + !is_interactive(&options) && !options.restrict_revision && + options.upstream && + !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) { + int flag; + + if (!(options.flags & REBASE_FORCE)) { + /* Lazily switch to the target branch if needed... */ + if (options.switch_to) { + struct object_id oid; + + if (get_oid(options.switch_to, &oid) < 0) { + ret = !!error(_("could not parse '%s'"), + options.switch_to); + goto cleanup; + } + + strbuf_reset(&buf); + strbuf_addf(&buf, "%s: checkout %s", + getenv(GIT_REFLOG_ACTION_ENVIRONMENT), + options.switch_to); + if (reset_head(&oid, "checkout", + options.head_name, 0, + NULL, buf.buf) < 0) { + ret = !!error(_("could not switch to " + "%s"), + options.switch_to); + goto cleanup; + } + } + + if (!(options.flags & REBASE_NO_QUIET)) + ; /* be quiet */ + else if (!strcmp(branch_name, "HEAD") && + resolve_ref_unsafe("HEAD", 0, NULL, &flag)) + puts(_("HEAD is up to date.")); + else + printf(_("Current branch %s is up to date.\n"), + branch_name); + ret = !!finish_rebase(&options); + goto cleanup; + } else if (!(options.flags & REBASE_NO_QUIET)) + ; /* be quiet */ + else if (!strcmp(branch_name, "HEAD") && + resolve_ref_unsafe("HEAD", 0, NULL, &flag)) + puts(_("HEAD is up to date, rebase forced.")); + else + printf(_("Current branch %s is up to date, rebase " + "forced.\n"), branch_name); + } + + /* If a hook exists, give it a chance to interrupt*/ + if (!ok_to_skip_pre_rebase && + run_hook_le(NULL, "pre-rebase", options.upstream_arg, + argc ? argv[0] : NULL, NULL)) + die(_("The pre-rebase hook refused to rebase.")); + + if (options.flags & REBASE_DIFFSTAT) { + struct diff_options opts; + + if (options.flags & REBASE_VERBOSE) { + if (is_null_oid(&merge_base)) + printf(_("Changes to %s:\n"), + oid_to_hex(&options.onto->object.oid)); + else + printf(_("Changes from %s to %s:\n"), + oid_to_hex(&merge_base), + oid_to_hex(&options.onto->object.oid)); + } + + /* We want color (if set), but no pager */ + diff_setup(&opts); + opts.stat_width = -1; /* use full terminal width */ + opts.stat_graph_width = -1; /* respect statGraphWidth config */ + opts.output_format |= + DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT; + opts.detect_rename = DIFF_DETECT_RENAME; + diff_setup_done(&opts); + diff_tree_oid(is_null_oid(&merge_base) ? + the_hash_algo->empty_tree : &merge_base, + &options.onto->object.oid, "", &opts); + diffcore_std(&opts); + diff_flush(&opts); + } + + if (is_interactive(&options)) + goto run_rebase; + + /* Detach HEAD and reset the tree */ + if (options.flags & REBASE_NO_QUIET) + printf(_("First, rewinding head to replay your work on top of " + "it...\n")); + + strbuf_addf(&msg, "%s: checkout %s", + getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name); + if (reset_head(&options.onto->object.oid, "checkout", NULL, + RESET_HEAD_DETACH, NULL, msg.buf)) + die(_("Could not detach HEAD")); + strbuf_release(&msg); + + /* + * If the onto is a proper descendant of the tip of the branch, then + * we just fast-forwarded. + */ + strbuf_reset(&msg); + if (!oidcmp(&merge_base, &options.orig_head)) { + printf(_("Fast-forwarded %s to %s.\n"), + branch_name, options.onto_name); + strbuf_addf(&msg, "rebase finished: %s onto %s", + options.head_name ? options.head_name : "detached HEAD", + oid_to_hex(&options.onto->object.oid)); + reset_head(NULL, "Fast-forwarded", options.head_name, 0, + "HEAD", msg.buf); + strbuf_release(&msg); + ret = !!finish_rebase(&options); + goto cleanup; + } + + strbuf_addf(&revisions, "%s..%s", + options.root ? oid_to_hex(&options.onto->object.oid) : + (options.restrict_revision ? + oid_to_hex(&options.restrict_revision->object.oid) : + oid_to_hex(&options.upstream->object.oid)), + oid_to_hex(&options.orig_head)); + + options.revisions = revisions.buf; + +run_rebase: + ret = !!run_specific_rebase(&options); + +cleanup: + strbuf_release(&revisions); + free(options.head_name); + free(options.gpg_sign_opt); + free(options.cmd); + free(squash_onto_name); + return ret; +} |