$ git clone -n https://src.fedoraproject.org/rpms/squid.git /var/lib/mock/f39-build-1704113-41218/root/chroot_tmpdir/scmroot/squid
Cloning into '/var/lib/mock/f39-build-1704113-41218/root/chroot_tmpdir/scmroot/squid'...
$ git fetch origin 014ff8bb7a1d9f2f3d3ab300bd7b6bfdf8728137:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/squid
 * [new ref]         014ff8bb7a1d9f2f3d3ab300bd7b6bfdf8728137 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 014ff8b new version 6.5