Re: [PATCH 09/11] Introduce filter_independent() in commit.c

[Junio C Hamano <gitster@pobox.com>]

Miklos Vajna <vmiklos@frugalware.org> writes:

> This is similar to git-show-branch --independent: It filters out commits
> which are reachable from any other item from the input list.
>
> Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
> ---
>  commit.c |   16 ++++++++++++++++
>  commit.h |    1 +
>  2 files changed, 17 insertions(+), 0 deletions(-)
>
> diff --git a/commit.c b/commit.c
> index 6052ca3..0dbf4b7 100644
> --- a/commit.c
> +++ b/commit.c
> @@ -705,3 +705,19 @@ int in_merge_bases(struct commit *commit, struct commit **reference, int num)
>  	free_commit_list(bases);
>  	return ret;
>  }
> +
> +struct commit_list *filter_independent(unsigned char *head,
> +	struct commit_list *heads)
> +{
> +	struct commit_list *i, *bases, *ret = NULL;
> +	struct commit_list **pptr = &ret;
> +
> +	commit_list_insert(lookup_commit(head), &heads);
> +
> +	bases = get_octopus_merge_bases(heads);
> +
> +	for (i = heads; i; i = i->next)
> +		if (!(i->item->object.flags & RESULT))
> +			pptr = &commit_list_insert(i->item, pptr)->next;

Hmm.  How well was this function tested?

Because RESULT is an implementation detail of merge_bases(), I do not
think we would want to expose it outside of it.

More worryingly, the flag is supposed to be cleaned from the objects after
get_merge_bases() returns.  I am not sure what you'll learn by looking at
the flag here.