$ git clone -n https://src.fedoraproject.org/rpms/ghc-simple-cmd.git /var/lib/mock/f41-build-839430-160145/root/chroot_tmpdir/scmroot/ghc-simple-cmd
Cloning into '/var/lib/mock/f41-build-839430-160145/root/chroot_tmpdir/scmroot/ghc-simple-cmd'...
$ git fetch origin 71141011835b1c6018c30093a21ff97e4f986582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-simple-cmd
 * [new ref]         71141011835b1c6018c30093a21ff97e4f986582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7114101 bump release