$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-atk.git /var/lib/mock/f41-build-723959-13112/root/chroot_tmpdir/scmroot/ghc-gi-atk
Cloning into '/var/lib/mock/f41-build-723959-13112/root/chroot_tmpdir/scmroot/ghc-gi-atk'...
$ git fetch origin c0be39eaa589bda9960aa0e3ab39560f76bcb8fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-atk
 * [new ref]         c0be39eaa589bda9960aa0e3ab39560f76bcb8fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0be39e cabal-rpm-2.1.5