$ git clone -n https://src.fedoraproject.org/rpms/ghc-servant-server.git /var/lib/mock/f40-build-744422-111705/root/chroot_tmpdir/scmroot/ghc-servant-server
Cloning into '/var/lib/mock/f40-build-744422-111705/root/chroot_tmpdir/scmroot/ghc-servant-server'...
$ git fetch origin 0f49766e66c9d4adc9c87207a3d75929ae44ced0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-servant-server
 * [new ref]         0f49766e66c9d4adc9c87207a3d75929ae44ced0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f49766 bump release