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refs: create and use ref_update_expects_existing_old_ref()

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The files and reftable backend, need to check if a ref must exist, so
that the required validation can be done. A ref must exist only when the
`old_oid` value of the update has been explicitly set and it is not the
`null_oid` value.

Since we also support symrefs now, we need to ensure that even when
`old_target` is set a ref must exist. While this was missed when we
added symref support in transactions, there are no active users of this
path. As we introduce the 'symref-verify' command in the upcoming
commits, it is important to fix this.

So let's export this to a function called
`ref_update_expects_existing_old_ref()` and expose it internally via
'refs-internal.h'.

Helped-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karthik Nayak
2024-06-07 15:32:58 +02:00
committed by Junio C Hamano
parent 939d49e9bd
commit aba381c090
4 changed files with 14 additions and 3 deletions
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6
refs.c
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@ -2863,3 +2863,9 @@ int ref_update_check_old_target(const char *referent, struct ref_update *update,
referent, update->old_target);
return -1;
}
int ref_update_expects_existing_old_ref(struct ref_update *update)
{
return (update->flags & REF_HAVE_OLD) &&
(!is_null_oid(&update->old_oid) || update->old_target);
}