diff options
Diffstat (limited to 'sequencer.c')
| -rw-r--r-- | sequencer.c | 151 |
1 files changed, 112 insertions, 39 deletions
diff --git a/sequencer.c b/sequencer.c index cd11e340dd..bf078f274b 100644 --- a/sequencer.c +++ b/sequencer.c @@ -13,6 +13,7 @@ #include "rerere.h" #include "merge-recursive.h" #include "refs.h" +#include "argv-array.h" #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION" @@ -251,6 +252,38 @@ static int do_recursive_merge(struct commit *base, struct commit *next, return !clean; } +static int is_index_unchanged(void) +{ + unsigned char head_sha1[20]; + struct commit *head_commit; + + if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL)) + return error(_("Could not resolve HEAD commit\n")); + + head_commit = lookup_commit(head_sha1); + + /* + * If head_commit is NULL, check_commit, called from + * lookup_commit, would have indicated that head_commit is not + * a commit object already. parse_commit() will return failure + * without further complaints in such a case. Otherwise, if + * the commit is invalid, parse_commit() will complain. So + * there is nothing for us to say here. Just return failure. + */ + if (parse_commit(head_commit)) + return -1; + + if (!active_cache_tree) + active_cache_tree = cache_tree(); + + if (!cache_tree_fully_valid(active_cache_tree)) + if (cache_tree_update(active_cache_tree, active_cache, + active_nr, 0)) + return error(_("Unable to update cache tree\n")); + + return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.sha1); +} + /* * If we are cherry-pick, and if the merge did not result in * hand-editing, we will hit this commit and inherit the original @@ -258,23 +291,87 @@ static int do_recursive_merge(struct commit *base, struct commit *next, * If we are revert, or if our cherry-pick results in a hand merge, * we had better say that the current user is responsible for that. */ -static int run_git_commit(const char *defmsg, struct replay_opts *opts) +static int run_git_commit(const char *defmsg, struct replay_opts *opts, + int allow_empty) { - /* 6 is max possible length of our args array including NULL */ - const char *args[6]; - int i = 0; + struct argv_array array; + int rc; + + argv_array_init(&array); + argv_array_push(&array, "commit"); + argv_array_push(&array, "-n"); - args[i++] = "commit"; - args[i++] = "-n"; if (opts->signoff) - args[i++] = "-s"; + argv_array_push(&array, "-s"); if (!opts->edit) { - args[i++] = "-F"; - args[i++] = defmsg; + argv_array_push(&array, "-F"); + argv_array_push(&array, defmsg); + } + + if (allow_empty) + argv_array_push(&array, "--allow-empty"); + + rc = run_command_v_opt(array.argv, RUN_GIT_CMD); + argv_array_clear(&array); + return rc; +} + +static int is_original_commit_empty(struct commit *commit) +{ + const unsigned char *ptree_sha1; + + if (parse_commit(commit)) + return error(_("Could not parse commit %s\n"), + sha1_to_hex(commit->object.sha1)); + if (commit->parents) { + struct commit *parent = commit->parents->item; + if (parse_commit(parent)) + return error(_("Could not parse parent commit %s\n"), + sha1_to_hex(parent->object.sha1)); + ptree_sha1 = parent->tree->object.sha1; + } else { + ptree_sha1 = EMPTY_TREE_SHA1_BIN; /* commit is root */ } - args[i] = NULL; - return run_command_v_opt(args, RUN_GIT_CMD); + return !hashcmp(ptree_sha1, commit->tree->object.sha1); +} + +/* + * 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) @@ -431,8 +528,11 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts) print_advice(res == 1, opts); rerere(opts->allow_rerere_auto); } else { + int allow = allow_empty(opts, commit); + if (allow < 0) + return allow; if (!opts->no_commit) - res = run_git_commit(defmsg, opts); + res = run_git_commit(defmsg, opts, allow); } free_message(&msg); @@ -468,33 +568,6 @@ static void read_and_refresh_cache(struct replay_opts *opts) rollback_lock_file(&index_lock); } -/* - * Append a commit to the end of the commit_list. - * - * next starts by pointing to the variable that holds the head of an - * empty commit_list, and is updated to point to the "next" field of - * the last item on the list as new commits are appended. - * - * Usage example: - * - * struct commit_list *list; - * struct commit_list **next = &list; - * - * next = commit_list_append(c1, next); - * next = commit_list_append(c2, next); - * assert(commit_list_count(list) == 2); - * return list; - */ -static struct commit_list **commit_list_append(struct commit *commit, - struct commit_list **next) -{ - struct commit_list *new = xmalloc(sizeof(struct commit_list)); - new->item = commit; - *next = new; - new->next = NULL; - return &new->next; -} - static int format_todo(struct strbuf *buf, struct commit_list *todo_list, struct replay_opts *opts) { |