Re: [PATCH v3 4/6] pseudorefs: create and use pseudoref update and delete functions

> Pseudorefs should not be updated through the ref transaction
> API, because alternate ref backends still need to store pseudorefs
> in GIT_DIR (instead of wherever they store refs).  Instead,
> change update_ref and delete_ref to call pseudoref-specific
> functions.
>
> Signed-off-by: David Turner <dturner@twopensource.com>
> ---
> diff --git a/refs.c b/refs.c
> index 553ae8b..2bd6aa6 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -2877,12 +2877,87 @@ enum ref_type ref_type(const char *refname)
> +static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1)
> +{
> +       static struct lock_file lock;
> +       const char *filename;
> +
> +       filename = git_path("%s", pseudoref);
> +
> +       if (old_sha1 && !is_null_sha1(old_sha1)) {
> +               int fd;
> +               unsigned char actual_old_sha1[20];
> +
> +               fd = hold_lock_file_for_update(&lock, filename,
> +                                              LOCK_DIE_ON_ERROR);
> +               if (fd < 0)
> +                       die_errno(_("Could not open '%s' for writing"), filename);
> +               read_ref(pseudoref, actual_old_sha1);
> +               if (hashcmp(actual_old_sha1, old_sha1)) {
> +                       warning("Unexpected sha1 when deleting %s", pseudoref);
> +                       return -1;

> +               }
> +
> +               unlink(filename);
> +               rollback_lock_file(&lock);
> +       } else {
> +               unlink(filename);
> +       }
> +
> +       return 0;
> +}