$ git clone -n https://src.fedoraproject.org/rpms/ghc-pipes.git /var/lib/mock/f40-build-2055511-49119/root/chroot_tmpdir/scmroot/ghc-pipes
Cloning into '/var/lib/mock/f40-build-2055511-49119/root/chroot_tmpdir/scmroot/ghc-pipes'...
$ git fetch origin a845b711d55d38bedb45b68a81960b75f685e0b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-pipes
 * [new ref]         a845b711d55d38bedb45b68a81960b75f685e0b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a845b71 bump release