$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson-yaml.git /var/lib/mock/f40-build-744534-111739/root/chroot_tmpdir/scmroot/ghc-aeson-yaml
Cloning into '/var/lib/mock/f40-build-744534-111739/root/chroot_tmpdir/scmroot/ghc-aeson-yaml'...
$ git fetch origin 69a7c8722ff7e830210a2e9e75ba5129f85b258b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-aeson-yaml
 * [new ref]         69a7c8722ff7e830210a2e9e75ba5129f85b258b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69a7c87 bump release