$ git clone -n https://src.fedoraproject.org/rpms/toot.git /var/lib/mock/f42-build-3294340-41426/root/chroot_tmpdir/scmroot/toot
Cloning into '/var/lib/mock/f42-build-3294340-41426/root/chroot_tmpdir/scmroot/toot'...
$ git fetch origin 7630941563d85afe738e74d48876fa00c5d9e0bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toot
 * [new ref]         7630941563d85afe738e74d48876fa00c5d9e0bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7630941 Update to 0.48.0