$ git clone -n https://src.fedoraproject.org/rpms/ghc-hourglass.git /var/lib/mock/f40-build-742184-110610/root/chroot_tmpdir/scmroot/ghc-hourglass
Cloning into '/var/lib/mock/f40-build-742184-110610/root/chroot_tmpdir/scmroot/ghc-hourglass'...
$ git fetch origin 607057350cc310290ce2e84822dcc6bc68822665:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hourglass
 * [new ref]         607057350cc310290ce2e84822dcc6bc68822665 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6070573 bump release