$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google-iam.git /var/lib/mock/f41-build-1285119-23248/root/chroot_tmpdir/scmroot/golang-cloud-google-iam
Cloning into '/var/lib/mock/f41-build-1285119-23248/root/chroot_tmpdir/scmroot/golang-cloud-google-iam'...
$ git fetch origin 5bf3beb40da68326d295c0f85b6b55ce8dddf7b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google-iam
 * [new ref]         5bf3beb40da68326d295c0f85b6b55ce8dddf7b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bf3beb Update to 1.1.8