$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector-space.git /var/lib/mock/f38-build-side-42-init-devel-837866-28399/root/chroot_tmpdir/scmroot/ghc-vector-space
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-837866-28399/root/chroot_tmpdir/scmroot/ghc-vector-space'...
$ git fetch origin 9cea7d2f4a6477e34a9da4ff4373032d1eef5cde:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector-space
 * [new ref]         9cea7d2f4a6477e34a9da4ff4373032d1eef5cde -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9cea7d2 Convert to %autorelease and %autochangelog