$ git clone -n https://src.fedoraproject.org/rpms/truth.git /var/lib/mock/f40-build-2488210-61651/root/chroot_tmpdir/scmroot/truth
Cloning into '/var/lib/mock/f40-build-2488210-61651/root/chroot_tmpdir/scmroot/truth'...
$ git fetch origin da1ba8eef20c479cb3c14cd47a5e7c1294599910:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/truth
 * [new ref]         da1ba8eef20c479cb3c14cd47a5e7c1294599910 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da1ba8e Desperate attempt to survive