$ git clone -n https://src.fedoraproject.org/rpms/rhdb-utils.git /var/lib/mock/f45-build-34515-687/root/chroot_tmpdir/scmroot/rhdb-utils
Cloning into '/var/lib/mock/f45-build-34515-687/root/chroot_tmpdir/scmroot/rhdb-utils'...
$ git fetch origin 4261b285fb48afecd29e8f3b18578a4f161c6883:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rhdb-utils
 * [new ref]         4261b285fb48afecd29e8f3b18578a4f161c6883 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4261b28 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild