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update-ref: add support for 'symref-verify' command

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The 'symref-verify' command allows users to verify if a provided <ref>
contains the provided <old-target> without changing the <ref>. If
<old-target> is not provided, the command will verify that the <ref>
doesn't exist.

The command allows users to verify symbolic refs within a transaction,
and this means users can perform a set of changes in a transaction only
when the verification holds good.

Since we're checking for symbolic refs, this command will only work with
the 'no-deref' mode. This is because any dereferenced symbolic ref will
point to an object and not a ref and the regular 'verify' command can be
used in such situations.

Add required tests for symref support in 'verify'. Since we're here,
also add reflog checks for the pre-existing 'verify' tests, there is no
divergence from behavior, but we never tested to ensure that reflog
wasn't affected by the 'verify' command.

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 15:33:00 +02:00
committed by Junio C Hamano
parent aa6e99f122
commit 1451ac734f
6 changed files with 208 additions and 15 deletions
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11
refs.c
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@@ -1331,14 +1331,19 @@ int ref_transaction_delete(struct ref_transaction *transaction,
int ref_transaction_verify(struct ref_transaction *transaction,
const char *refname,
const struct object_id *old_oid,
const char *old_target,
unsigned int flags,
struct strbuf *err)
{
if (!old_oid)
BUG("verify called with old_oid set to NULL");
if (!old_target && !old_oid)
BUG("verify called with old_oid and old_target set to NULL");
if (old_oid && old_target)
BUG("verify called with both old_oid and old_target set");
if (old_target && !(flags & REF_NO_DEREF))
BUG("verify cannot operate on symrefs with deref mode");
return ref_transaction_update(transaction, refname,
NULL, old_oid,
NULL, NULL,
NULL, old_target,
flags, NULL, err);
}