$ git clone -n https://src.fedoraproject.org/rpms/squirrel.git /var/lib/mock/f40-build-2064637-49167/root/chroot_tmpdir/scmroot/squirrel
Cloning into '/var/lib/mock/f40-build-2064637-49167/root/chroot_tmpdir/scmroot/squirrel'...
$ git fetch origin ccb66c42fc700e5c3ec8a16bc8c61c176053c1f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/squirrel
 * [new ref]         ccb66c42fc700e5c3ec8a16bc8c61c176053c1f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ccb66c4 - update to upstream version 3.2