$ git clone -n https://src.fedoraproject.org/rpms/ghc-prelude-extras.git /var/lib/mock/f40-build-742275-110680/root/chroot_tmpdir/scmroot/ghc-prelude-extras
Cloning into '/var/lib/mock/f40-build-742275-110680/root/chroot_tmpdir/scmroot/ghc-prelude-extras'...
$ git fetch origin cbdb6df807a82e6252c80a0642fe6d1e3e5136c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-prelude-extras
 * [new ref]         cbdb6df807a82e6252c80a0642fe6d1e3e5136c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbdb6df bump release