$ git clone -n https://src.fedoraproject.org/rpms/ghc-xdg-userdirs.git /var/lib/mock/f40-build-742726-110881/root/chroot_tmpdir/scmroot/ghc-xdg-userdirs
Cloning into '/var/lib/mock/f40-build-742726-110881/root/chroot_tmpdir/scmroot/ghc-xdg-userdirs'...
$ git fetch origin d6bbbd89c67dada6bfa62c316e1c8cff71e2affc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-xdg-userdirs
 * [new ref]         d6bbbd89c67dada6bfa62c316e1c8cff71e2affc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6bbbd8 bump release