$ git clone -n https://src.fedoraproject.org/rpms/ghc-refact.git /var/lib/mock/f40-build-1998260-44224/root/chroot_tmpdir/scmroot/ghc-refact
Cloning into '/var/lib/mock/f40-build-1998260-44224/root/chroot_tmpdir/scmroot/ghc-refact'...
$ git fetch origin efb8d6798a993a9fdc2adda8c56cf8006559499c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-refact
 * [new ref]         efb8d6798a993a9fdc2adda8c56cf8006559499c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efb8d67 bump release