$ git clone -n https://src.fedoraproject.org/rpms/icecream.git /var/lib/mock/f41-build-side-1-2805933-32866/root/chroot_tmpdir/scmroot/icecream
Cloning into '/var/lib/mock/f41-build-side-1-2805933-32866/root/chroot_tmpdir/scmroot/icecream'...
$ git fetch origin 447cb8977f8642cca1b3c0327e800f7f1826d403:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icecream
 * [new ref]         447cb8977f8642cca1b3c0327e800f7f1826d403 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 447cb89 convert GPLv2+ license to SPDX