On Thu, Apr 07, 2016 at 12:42:19AM -0400, Jeff King wrote:
> On Wed, Apr 06, 2016 at 06:15:03PM +0100, Adam Dinwoodie wrote:
>
> > `git commit --amend -m ''` seems to be an unambiguous request to blank a
> > commit message, but it actually leaves the commit message as-is. That's
> > the case regardless of whether `--allow-empty-message` is specified, and
> > doesn't so much as drop a non-zero return code.
> >
> > Add failing tests to show this behaviour.
>
> Hmm. Is it just that we check "message.len", which cannot tell the
> difference between "-m was not given" and "-m was given the empty
> string"?
>
> IOW, would this fix it?
>
> diff --git a/builtin/commit.c b/builtin/commit.c
> index 109742e..3cdc44e 100644
> --- a/builtin/commit.c
> +++ b/builtin/commit.c
> @@ -695,7 +695,7 @@ static int prepare_to_commit(const char *index_file,
> const char *prefix,
> }
> }
>
> - if (message.len) {
> + if (have_option_m) {
> strbuf_addbuf(&sb, &message);
> hook_arg1 = "message";
> } else if (logfile && !strcmp(logfile, "-")) {
I guessed that this might have come from the conversion of "message"
form a pointer (which could be NULL) into a strbuf. And indeed, it looks
like f956853 (builtin-commit: resurrect behavior for multiple -m
options, 2007-11-11) did that.
There are a few other checks for "message.len" which probably should be
using "have_option_m". E.g.:
$ git commit -F /dev/null -m foo
fatal: Option -m cannot be combined with -c/-C/-F/--fixup.
$ git commit -F /dev/null -m ''
On branch master
nothing to commit, working directory clean
-Peff
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