Re: [PATCH 03/13] delete_ref(): handle special case more explicitly

[Stefan Beller <sbeller@google.com>]

On Mon, Jun 8, 2015 at 4:45 AM, Michael Haggerty <mhagger@alum.mit.edu> wrote:
> delete_ref() uses a different convention for its old_sha1 parameter
> than, say, ref_transaction_delete(): NULL_SHA1 means not to check the
> old value. Make this fact a little bit clearer in the code by handling
> it in explicit, commented code rather than burying it in a conditional
> expression.
>
> Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
> ---
>  refs.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/refs.c b/refs.c
> index b575bb8..f9d87b6 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -2795,10 +2795,13 @@ int delete_ref(const char *refname, const unsigned char *old_sha1,
>         struct ref_transaction *transaction;
>         struct strbuf err = STRBUF_INIT;
>
> +       /* Treat NULL_SHA1 as "don't care" */

and by "don't care" you mean we still care about getting it deleted,
the part we don't care about is the particular sha1 (could be a bogus ref).

> +       if (old_sha1 && is_null_sha1(old_sha1))
> +               old_sha1 = NULL;
> +
>         transaction = ref_transaction_begin(&err);
>         if (!transaction ||
> -           ref_transaction_delete(transaction, refname,
> -                                  (old_sha1 && !is_null_sha1(old_sha1)) ? old_sha1 : NULL,
> +           ref_transaction_delete(transaction, refname, old_sha1,
>                                    flags, NULL, &err) ||
>             ref_transaction_commit(transaction, &err)) {
>                 error("%s", err.buf);
> --
> 2.1.4
>