$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson-pretty.git /var/lib/mock/f40-build-744818-111849/root/chroot_tmpdir/scmroot/ghc-aeson-pretty
Cloning into '/var/lib/mock/f40-build-744818-111849/root/chroot_tmpdir/scmroot/ghc-aeson-pretty'...
$ git fetch origin b7e5d628900b841020a8f963a48231e4f98ddc5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-aeson-pretty
 * [new ref]         b7e5d628900b841020a8f963a48231e4f98ddc5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7e5d62 bump release