$ git clone -n https://src.fedoraproject.org/rpms/python-google-cloud-storage.git /var/lib/mock/f39-build-1950108-43210/root/chroot_tmpdir/scmroot/python-google-cloud-storage
Cloning into '/var/lib/mock/f39-build-1950108-43210/root/chroot_tmpdir/scmroot/python-google-cloud-storage'...
$ git fetch origin b22f9d34af9610f268aae65a60019aa5c7d82fd4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-google-cloud-storage
 * [new ref]         b22f9d34af9610f268aae65a60019aa5c7d82fd4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b22f9d3 Merge branch 'rawhide' into f39