$ git clone -n https://src.fedoraproject.org/rpms/cpuinfo.git /var/lib/mock/f39-build-2469713-61444/root/chroot_tmpdir/scmroot/cpuinfo
Cloning into '/var/lib/mock/f39-build-2469713-61444/root/chroot_tmpdir/scmroot/cpuinfo'...
$ git fetch origin a8f867dbf2d62457f282caa116b1b1f43f9cec5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpuinfo
 * [new ref]         a8f867dbf2d62457f282caa116b1b1f43f9cec5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8f867d Initial package