$ git clone -n https://src.fedoraproject.org/rpms/ghc-basic-prelude.git /var/lib/mock/f40-build-1997695-44168/root/chroot_tmpdir/scmroot/ghc-basic-prelude
Cloning into '/var/lib/mock/f40-build-1997695-44168/root/chroot_tmpdir/scmroot/ghc-basic-prelude'...
$ git fetch origin 4048fffdee7dbedd2f4080cffdb05bfecf8b85da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-basic-prelude
 * [new ref]         4048fffdee7dbedd2f4080cffdb05bfecf8b85da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4048fff bump release