[PATCH 4/5] packed-backend: remove stub BUG(...) functions

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Remove the stub BUG(...) functions previously used by the "struct
ref_storage_be refs_be_packed" backend.

We never call any functions in the packed backend by using it as a
"normal" primary ref store, instead we'll always initialize a "files"
backend ref-store.

It will then via the "packed_ref_store" member of "struct
files_ref_store" call selected functions in the "packed" backend, and
we'll in addition call others via wrappers in refs.c.

So while these would arguably give us *slightly* more meaningful error
messages we'll NULL the missing members in the initializer anyway, so
we'll reliably get a segfault if we're ever changing the backend and
having it call something it doesn't have.

So there's no need for this verbose boilerplate, and as shown in a
subsequent commit it might even lead to some confusion about the
packed backend being a "real" backend. Let's make it clear that it's
not.

As an aside, this also fixes a warning emitted by SunCC in at least
versions 12.5 and 12.6 of Oracle Developer Studio:

    "refs/packed-backend.c", line 1599: warning: Function has no return statement : packed_create_symref
    "refs/packed-backend.c", line 1606: warning: Function has no return statement : packed_rename_ref)
    "refs/packed-backend.c", line 1613: warning: Function has no return statement : packed_copy_ref
    "refs/packed-backend.c", line 1648: warning: Function has no return statement : packed_create_reflog

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 refs/packed-backend.c | 88 +++++--------------------------------------
 1 file changed, 9 insertions(+), 79 deletions(-)

diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 03002451f15..310c2a72026 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -1591,81 +1591,11 @@ static int packed_pack_refs(struct ref_store *ref_store, unsigned int flags)
 	return 0;
 }
 
-static int packed_create_symref(struct ref_store *ref_store,
-			       const char *refname, const char *target,
-			       const char *logmsg)
-{
-	BUG("packed reference store does not support symrefs");
-}
-
-static int packed_rename_ref(struct ref_store *ref_store,
-			    const char *oldrefname, const char *newrefname,
-			    const char *logmsg)
-{
-	BUG("packed reference store does not support renaming references");
-}
-
-static int packed_copy_ref(struct ref_store *ref_store,
-			   const char *oldrefname, const char *newrefname,
-			   const char *logmsg)
-{
-	BUG("packed reference store does not support copying references");
-}
-
 static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_store)
 {
 	return empty_ref_iterator_begin();
 }
 
-static int packed_for_each_reflog_ent(struct ref_store *ref_store,
-				      const char *refname,
-				      each_reflog_ent_fn fn, void *cb_data)
-{
-	BUG("packed reference store does not support reflogs");
-	return 0;
-}
-
-static int packed_for_each_reflog_ent_reverse(struct ref_store *ref_store,
-					      const char *refname,
-					      each_reflog_ent_fn fn,
-					      void *cb_data)
-{
-	BUG("packed reference store does not support reflogs");
-	return 0;
-}
-
-static int packed_reflog_exists(struct ref_store *ref_store,
-			       const char *refname)
-{
-	BUG("packed reference store does not support reflogs");
-	return 0;
-}
-
-static int packed_create_reflog(struct ref_store *ref_store,
-				const char *refname, struct strbuf *err)
-{
-	BUG("packed reference store does not support reflogs");
-}
-
-static int packed_delete_reflog(struct ref_store *ref_store,
-			       const char *refname)
-{
-	BUG("packed reference store does not support reflogs");
-	return 0;
-}
-
-static int packed_reflog_expire(struct ref_store *ref_store,
-				const char *refname,
-				unsigned int flags,
-				reflog_expiry_prepare_fn prepare_fn,
-				reflog_expiry_should_prune_fn should_prune_fn,
-				reflog_expiry_cleanup_fn cleanup_fn,
-				void *policy_cb_data)
-{
-	BUG("packed reference store does not support reflogs");
-	return 0;
-}
-
 struct ref_storage_be refs_be_packed = {
 	.next = NULL,
 	.name = "packed",
@@ -1677,20 +1607,20 @@ struct ref_storage_be refs_be_packed = {
 	.initial_transaction_commit = packed_initial_transaction_commit,
 
 	.pack_refs = packed_pack_refs,
-	.create_symref = packed_create_symref,
+	.create_symref = NULL,
 	.delete_refs = packed_delete_refs,
-	.rename_ref = packed_rename_ref,
-	.copy_ref = packed_copy_ref,
+	.rename_ref = NULL,
+	.copy_ref = NULL,
 
 	.iterator_begin = packed_ref_iterator_begin,
 	.read_raw_ref = packed_read_raw_ref,
 	.read_symbolic_ref = NULL,
 
 	.reflog_iterator_begin = packed_reflog_iterator_begin,
-	.for_each_reflog_ent = packed_for_each_reflog_ent,
-	.for_each_reflog_ent_reverse = packed_for_each_reflog_ent_reverse,
-	.reflog_exists = packed_reflog_exists,
-	.create_reflog = packed_create_reflog,
-	.delete_reflog = packed_delete_reflog,
-	.reflog_expire = packed_reflog_expire
+	.for_each_reflog_ent = NULL,
+	.for_each_reflog_ent_reverse = NULL,
+	.reflog_exists = NULL,
+	.create_reflog = NULL,
+	.delete_reflog = NULL,
+	.reflog_expire = NULL,
 };
-- 
2.35.1.1384.g7d2906948a1