$ git clone -n https://src.fedoraproject.org/rpms/ghc-language-java.git /var/lib/mock/f41-build-839503-160201/root/chroot_tmpdir/scmroot/ghc-language-java
Cloning into '/var/lib/mock/f41-build-839503-160201/root/chroot_tmpdir/scmroot/ghc-language-java'...
$ git fetch origin 854ac90246b7b28965d415e98e990c107dafd810:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-language-java
 * [new ref]         854ac90246b7b28965d415e98e990c107dafd810 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 854ac90 bump release