$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-memocombinators.git /var/lib/mock/f40-build-2074876-49444/root/chroot_tmpdir/scmroot/ghc-data-memocombinators
Cloning into '/var/lib/mock/f40-build-2074876-49444/root/chroot_tmpdir/scmroot/ghc-data-memocombinators'...
$ git fetch origin 30a4693f5ef790e7f7e07658bc8dfd1d9eee586d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-memocombinators
 * [new ref]         30a4693f5ef790e7f7e07658bc8dfd1d9eee586d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30a4693 bump release