Re: [PATCH] builtin-commit: avoid always using reduce_heads()

["Shawn O. Pearce" <spearce@spearce.org>]

Miklos Vajna <vmiklos@frugalware.org> wrote:
> In case git merge --no-ff is used with --no-commit or we have a
> conflict, write info about if fast forwards are allowed or not to
> $GIT_DIR/MERGE_MODE.
 
> diff --git a/builtin-commit.c b/builtin-commit.c
> index 55e1087..aac5cb4 100644
> --- a/builtin-commit.c
> +++ b/builtin-commit.c
> @@ -988,7 +990,18 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
>  		reflog_msg = "commit";
>  		pptr = &commit_list_insert(lookup_commit(head_sha1), pptr)->next;
>  	}
> -	parents = reduce_heads(parents);
> +	strbuf_reset(&sb);
> +	if (!stat(git_path("MERGE_MODE"), &statbuf)) {
> +		if (strbuf_read_file(&sb, git_path("MERGE_MODE"), 0) < 0)
> +			die("could not read MERGE_MODE: %s", strerror(errno));
> +		printf("debug, contents of buf: '%s'\n",sb.buf);
> +		if (!strcmp(sb.buf, "deny_fast_forward")) {
> +			printf("debug, deny fast forward\n");

Left over debugging.

> diff --git a/builtin-merge.c b/builtin-merge.c
> index 5c65a58..973b167 100644
> --- a/builtin-merge.c
> +++ b/builtin-merge.c
> @@ -1210,6 +1210,15 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
>  			merge_msg.len)
>  			die("Could not write to %s", git_path("MERGE_MSG"));
>  		close(fd);
> +		fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT, 0666);
> +		if (fd < 0)
> +			die("Could open %s for writing", git_path("MERGE_MODE"));
> +		strbuf_reset(&buf);
> +		if (!allow_fast_forward)
> +			strbuf_addf(&buf, "deny_fast_forward");

I wonder if the option in the file shouldn't be more related to
the merge command line option.  Its --no-ff to the user.  Maybe we
should call it "no-ff" here?  Or "no-fast-forward" if we want to go
with a longer name that is less likely to be ambiguous in the future?

-- 
Shawn.