$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-ostree.git /var/lib/mock/f41-build-840809-160954/root/chroot_tmpdir/scmroot/ghc-gi-ostree
Cloning into '/var/lib/mock/f41-build-840809-160954/root/chroot_tmpdir/scmroot/ghc-gi-ostree'...
$ git fetch origin d603aaae84c7e123592a3a439514cd295076d310:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-ostree
 * [new ref]         d603aaae84c7e123592a3a439514cd295076d310 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d603aaa https://hackage.haskell.org/package/gi-ostree-1.0.19/changelog