/* * Do we run "git commit" with "--allow-empty"? */ static int allow_empty(struct replay_opts *opts, struct commit *commit) { int index_unchanged, empty_commit; /* * Three cases: * * (1) we do not allow empty at all and error out. * * (2) we allow ones that were initially empty, but * forbid the ones that become empty; * * (3) we allow both. */ if (!opts->allow_empty) return 0; /* let "git commit" barf as necessary */ index_unchanged = is_index_unchanged(); if (index_unchanged < 0) return index_unchanged; if (!index_unchanged) return 0; /* we do not have to say --allow-empty */ if (opts->keep_redundant_commits) return 1; empty_commit = is_original_commit_empty(commit); if (empty_commit < 0) return empty_commit; if (!empty_commit) return 0; else return 1; }
static int do_pick_commit(struct commit *commit, struct replay_opts *opts) { unsigned char head[20]; struct commit *base, *next, *parent; const char *base_label, *next_label; struct commit_message msg = { NULL, NULL, NULL, NULL, NULL }; char *defmsg = NULL; struct strbuf msgbuf = STRBUF_INIT; int res, unborn = 0, allow; if (opts->no_commit) { /* * We do not intend to commit immediately. We just want to * merge the differences in, so let's compute the tree * that represents the "current" state for merge-recursive * to work on. */ if (write_cache_as_tree(head, 0, NULL)) die (_("Your index file is unmerged.")); } else { unborn = get_sha1("HEAD", head); if (unborn) hashcpy(head, EMPTY_TREE_SHA1_BIN); if (index_differs_from(unborn ? EMPTY_TREE_SHA1_HEX : "HEAD", 0)) return error_dirty_index(opts); } discard_cache(); if (!commit->parents) { parent = NULL; } else if (commit->parents->next) { /* Reverting or cherry-picking a merge commit */ int cnt; struct commit_list *p; if (!opts->mainline) return error(_("Commit %s is a merge but no -m option was given."), sha1_to_hex(commit->object.sha1)); for (cnt = 1, p = commit->parents; cnt != opts->mainline && p; cnt++) p = p->next; if (cnt != opts->mainline || !p) return error(_("Commit %s does not have parent %d"), sha1_to_hex(commit->object.sha1), opts->mainline); parent = p->item; } else if (0 < opts->mainline) return error(_("Mainline was specified but commit %s is not a merge."), sha1_to_hex(commit->object.sha1)); else parent = commit->parents->item; if (opts->allow_ff && ((parent && !hashcmp(parent->object.sha1, head)) || (!parent && unborn))) return fast_forward_to(commit->object.sha1, head, unborn, opts); if (parent && parse_commit(parent) < 0) /* TRANSLATORS: The first %s will be "revert" or "cherry-pick", the second %s a SHA1 */ return error(_("%s: cannot parse parent commit %s"), action_name(opts), sha1_to_hex(parent->object.sha1)); if (get_message(commit, &msg) != 0) return error(_("Cannot get commit message for %s"), sha1_to_hex(commit->object.sha1)); /* * "commit" is an existing commit. We would want to apply * the difference it introduces since its first parent "prev" * on top of the current HEAD if we are cherry-pick. Or the * reverse of it if we are revert. */ defmsg = git_pathdup("MERGE_MSG"); if (opts->action == REPLAY_REVERT) { base = commit; base_label = msg.label; next = parent; next_label = msg.parent_label; strbuf_addstr(&msgbuf, "Revert \""); strbuf_addstr(&msgbuf, msg.subject); strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit "); strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1)); if (commit->parents && commit->parents->next) { strbuf_addstr(&msgbuf, ", reversing\nchanges made to "); strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1)); } strbuf_addstr(&msgbuf, ".\n"); } else { const char *p; base = parent; base_label = msg.parent_label; next = commit; next_label = msg.label; /* * Append the commit log message to msgbuf; it starts * after the tree, parent, author, committer * information followed by "\n\n". */ p = strstr(msg.message, "\n\n"); if (p) { p += 2; strbuf_addstr(&msgbuf, p); } if (opts->record_origin) { if (!has_conforming_footer(&msgbuf, NULL, 0)) strbuf_addch(&msgbuf, '\n'); strbuf_addstr(&msgbuf, cherry_picked_prefix); strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1)); strbuf_addstr(&msgbuf, ")\n"); } } if (!opts->strategy || !strcmp(opts->strategy, "recursive") || opts->action == REPLAY_REVERT) { res = do_recursive_merge(base, next, base_label, next_label, head, &msgbuf, opts); write_message(&msgbuf, defmsg); } else { struct commit_list *common = NULL; struct commit_list *remotes = NULL; write_message(&msgbuf, defmsg); commit_list_insert(base, &common); commit_list_insert(next, &remotes); res = try_merge_command(opts->strategy, opts->xopts_nr, opts->xopts, common, sha1_to_hex(head), remotes); free_commit_list(common); free_commit_list(remotes); } /* * If the merge was clean or if it failed due to conflict, we write * CHERRY_PICK_HEAD for the subsequent invocation of commit to use. * However, if the merge did not even start, then we don't want to * write it at all. */ if (opts->action == REPLAY_PICK && !opts->no_commit && (res == 0 || res == 1)) write_cherry_pick_head(commit, "CHERRY_PICK_HEAD"); if (opts->action == REPLAY_REVERT && ((opts->no_commit && res == 0) || res == 1)) write_cherry_pick_head(commit, "REVERT_HEAD"); if (res) { error(opts->action == REPLAY_REVERT ? _("could not revert %s... %s") : _("could not apply %s... %s"), find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), msg.subject); print_advice(res == 1, opts); rerere(opts->allow_rerere_auto); goto leave; } if (opts->skip_empty && is_index_unchanged() == 1) { if (!opts->quiet) warning(_("skipping %s... %s"), find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), msg.subject); goto leave; } allow = allow_empty(opts, commit); if (allow < 0) { res = allow; goto leave; } if (!opts->no_commit) res = run_git_commit(defmsg, opts, allow); if (!res && opts->action == REPLAY_PICK) { unsigned char to[20]; if (read_ref("HEAD", to)) goto leave; add_rewritten(&rewritten, commit->object.sha1, to); } leave: free_message(&msg); free(defmsg); return res; }