$ git clone -n https://src.fedoraproject.org/rpms/ghc-Boolean.git /var/lib/mock/f41-build-835785-158645/root/chroot_tmpdir/scmroot/ghc-Boolean
Cloning into '/var/lib/mock/f41-build-835785-158645/root/chroot_tmpdir/scmroot/ghc-Boolean'...
$ git fetch origin 5528f34e4aa2b883335bb41fd12a597310cd5231:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-Boolean
 * [new ref]         5528f34e4aa2b883335bb41fd12a597310cd5231 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5528f34 bump release