$ git clone -n https://src.fedoraproject.org/rpms/rust-graphene-rs0.19.git /var/lib/mock/f42-build-side-1-3505942-45995/root/chroot_tmpdir/scmroot/rust-graphene-rs0.19
Cloning into '/var/lib/mock/f42-build-side-1-3505942-45995/root/chroot_tmpdir/scmroot/rust-graphene-rs0.19'...
$ git fetch origin 8f486eb304a0d830dcbe7e882e7949af9284b735:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-graphene-rs0.19
 * [new ref]         8f486eb304a0d830dcbe7e882e7949af9284b735 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f486eb compat package no longer needed