From 9663c3bc6a04b9b4f63a54b820d3edb16aa95e6d Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sun, 2 Dec 2007 23:55:23 -0800 Subject: [PATCH] git-commit: Allow to amend a merge commit that does not change the tree Normally, it should not be allowed to generate an empty commit. A merge commit generated with git 'merge -s ours' does not change the tree (along the first parent), but merges are not "empty" even if they do not change the tree. Hence, we should be careful not to forbid this case. Signed-off-by: Junio C Hamano --- builtin-commit.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/builtin-commit.c b/builtin-commit.c index f37a90f07..6c2dc390c 100644 --- a/builtin-commit.c +++ b/builtin-commit.c @@ -676,6 +676,14 @@ int git_commit_config(const char *k, const char *v) return git_status_config(k, v); } +static int is_a_merge(const unsigned char *sha1) +{ + struct commit *commit = lookup_commit(sha1); + if (!commit || parse_commit(commit)) + die("could not parse HEAD commit"); + return !!(commit->parents && commit->parents->next); +} + static const char commit_utf8_warn[] = "Warning: commit message does not conform to UTF-8.\n" "You may want to amend it after fixing the message, or set the config\n" @@ -701,7 +709,8 @@ int cmd_commit(int argc, const char **argv, const char *prefix) return 1; } - if (!prepare_log_message(index_file, prefix) && !in_merge) { + if (!prepare_log_message(index_file, prefix) && !in_merge && + !(amend && is_a_merge(head_sha1))) { run_status(stdout, index_file, prefix); rollback_index_files(); unlink(commit_editmsg); -- 2.30.2