diff options
| -rw-r--r-- | sequencer.c | 73 | ||||
| -rwxr-xr-x | t/t3505-cherry-pick-empty.sh | 30 |
2 files changed, 75 insertions, 28 deletions
diff --git a/sequencer.c b/sequencer.c index 3c384b94d2..bf078f274b 100644 --- a/sequencer.c +++ b/sequencer.c @@ -291,7 +291,8 @@ static int is_index_unchanged(void) * 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) { struct argv_array array; int rc; @@ -307,7 +308,7 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts) argv_array_push(&array, defmsg); } - if (opts->allow_empty) + if (allow_empty) argv_array_push(&array, "--allow-empty"); rc = run_command_v_opt(array.argv, RUN_GIT_CMD); @@ -335,6 +336,44 @@ static int is_original_commit_empty(struct commit *commit) 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) { unsigned char head[20]; @@ -344,8 +383,6 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts) char *defmsg = NULL; struct strbuf msgbuf = STRBUF_INIT; int res; - int empty_commit; - int index_unchanged; if (opts->no_commit) { /* @@ -471,10 +508,6 @@ static int do_pick_commit(struct commit *commit, struct replay_opts *opts) free_commit_list(remotes); } - empty_commit = is_original_commit_empty(commit); - if (empty_commit < 0) - return empty_commit; - /* * 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. @@ -495,27 +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 { - index_unchanged = is_index_unchanged(); - /* - * If index_unchanged is less than 0, that indicates we either - * couldn't parse HEAD or the index, so error out here. - */ - if (index_unchanged < 0) - return index_unchanged; - - if (!empty_commit && !opts->keep_redundant_commits && index_unchanged) - /* - * The head tree and the index match - * meaning the commit is empty. Since it wasn't created - * empty (based on the previous test), we can conclude - * the commit has been made redundant. Since we don't - * want to keep redundant commits, we can just return - * here, skipping this commit - */ - return 0; - + 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); diff --git a/t/t3505-cherry-pick-empty.sh b/t/t3505-cherry-pick-empty.sh index 92f00cdf84..5a1340cee6 100755 --- a/t/t3505-cherry-pick-empty.sh +++ b/t/t3505-cherry-pick-empty.sh @@ -71,4 +71,34 @@ test_expect_success 'cherry pick with --keep-redundant-commits' ' git cherry-pick --keep-redundant-commits HEAD^ ' +test_expect_success 'cherry-pick a commit that becomes no-op (prep)' ' + git checkout master && + git branch fork && + echo foo >file2 && + git add file2 && + test_tick && + git commit -m "add file2 on master" && + + git checkout fork && + echo foo >file2 && + git add file2 && + test_tick && + git commit -m "add file2 on the side" +' + +test_expect_success 'cherry-pick a no-op without --keep-redundant' ' + git reset --hard && + git checkout fork^0 && + test_must_fail git cherry-pick master +' + +test_expect_success 'cherry-pick a no-op with --keep-redundant' ' + git reset --hard && + git checkout fork^0 && + git cherry-pick --keep-redundant-commits master && + git show -s --format='%s' >actual && + echo "add file2 on master" >expect && + test_cmp expect actual +' + test_done |