$ git clone -n https://src.fedoraproject.org/rpms/librvngabw.git /var/lib/mock/f45-build-16917-493/root/chroot_tmpdir/scmroot/librvngabw
Cloning into '/var/lib/mock/f45-build-16917-493/root/chroot_tmpdir/scmroot/librvngabw'...
$ git fetch origin 12380b5463b433902ce9a6ef8cc912906d6dd64b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librvngabw
 * [new ref]         12380b5463b433902ce9a6ef8cc912906d6dd64b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12380b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild