$ git clone -n https://src.fedoraproject.org/rpms/tracer.git /var/lib/mock/f40-build-2235257-53420/root/chroot_tmpdir/scmroot/tracer
Cloning into '/var/lib/mock/f40-build-2235257-53420/root/chroot_tmpdir/scmroot/tracer'...
$ git fetch origin 4534d68d821625c2eb666a4a5925ff1473c6476f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tracer
 * [new ref]         4534d68d821625c2eb666a4a5925ff1473c6476f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4534d68 Update tracer to 1.1-1