$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Signature.git /var/lib/mock/f40-build-2021555-46726/root/chroot_tmpdir/scmroot/perl-Test-Signature
Cloning into '/var/lib/mock/f40-build-2021555-46726/root/chroot_tmpdir/scmroot/perl-Test-Signature'...
$ git fetch origin dd9acd67c60093c0a03c6d7fc0c31d9323b9eb4b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Signature
 * [new ref]         dd9acd67c60093c0a03c6d7fc0c31d9323b9eb4b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd9acd6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild