Nguyễn Thái Ngọc Duy  <pclo...@gmail.com> writes:

> We only try to get branch name in "format-patch origin" case or
> similar and not "format-patch -22" where HEAD is automatically
> added. Without correct branch name, branch description cannot be
> added. Make sure we always get branch name.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
> ---
>  builtin/log.c           | 16 +++++++++++++---
>  t/t4014-format-patch.sh |  7 +++++++
>  2 files changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/builtin/log.c b/builtin/log.c
> index 039bf67..81683f6 100644
> --- a/builtin/log.c
> +++ b/builtin/log.c
> @@ -1027,12 +1027,22 @@ static char *find_branch_name(struct rev_info *rev)
>               else
>                       return NULL;
>       }
> -     if (positive < 0)
> +     if (positive >= 0)
> +             ref = rev->cmdline.rev[positive].name;
> +     else if (!rev->cmdline.nr && rev->pending.nr == 1 &&
> +              !strcmp(rev->pending.objects[0].name, "HEAD"))
> +             /*
> +              * No actual ref from command line, but "HEAD" from
> +              * rev->def was added in setup_revisions()
> +              * e.g. format-patch --cover-letter -12
> +              */
> +             ref = "HEAD";
> +     else
>               return NULL;
> -     ref = rev->cmdline.rev[positive].name;
>       if (dwim_ref(ref, strlen(ref), branch_sha1, &full_ref) &&
>           !prefixcmp(full_ref, "refs/heads/") &&
> -         !hashcmp(rev->cmdline.rev[positive].item->sha1, branch_sha1))
> +         (positive < 0 ||
> +          !hashcmp(rev->cmdline.rev[positive].item->sha1, branch_sha1)))

This hashcmp() is to make sure that the tip we _guessed_ with
dwim_ref() that the user meant matches what we are going to use, so
I do not think disabling the check is a good idea.

You could (and I think you should) do something like this:

        if (0 <= positive) {
                ref = rev->cmdline.rev[positive].name;
                tip_sha1 = rev->cmdline.rev[positive].item->sha1;
        } else if (... defaulted to implied HEAD? ...) {
                ref = "HEAD";
                tip_sha1 = rev->pending.objects[0].item->sha1;
        } else {
                return NULL;
        }

        if (dwim_ref(...) && !prefixcmp(full_ref, "refs/heads/") &&
            !hashcmp(tip_sha1, branch_sha1))

to preserve that safety instead.
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