$ git clone -n https://src.fedoraproject.org/rpms/ghc-system-fileio.git /var/lib/mock/f41-build-838861-159865/root/chroot_tmpdir/scmroot/ghc-system-fileio
Cloning into '/var/lib/mock/f41-build-838861-159865/root/chroot_tmpdir/scmroot/ghc-system-fileio'...
$ git fetch origin e737488f542e86df52fc910b99eed7bf7216abe7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-system-fileio
 * [new ref]         e737488f542e86df52fc910b99eed7bf7216abe7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e737488 bump release