$ git clone -n https://src.fedoraproject.org/rpms/librx.git /var/lib/mock/f45-build-16958-494/root/chroot_tmpdir/scmroot/librx
Cloning into '/var/lib/mock/f45-build-16958-494/root/chroot_tmpdir/scmroot/librx'...
$ git fetch origin d4886e69d2e0d895be9607726f308b86b3c3dfbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librx
 * [new ref]         d4886e69d2e0d895be9607726f308b86b3c3dfbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4886e6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild