$ git clone -n https://src.fedoraproject.org/rpms/pcp.git /var/lib/mock/f39-build-2445083-61041/root/chroot_tmpdir/scmroot/pcp
Cloning into '/var/lib/mock/f39-build-2445083-61041/root/chroot_tmpdir/scmroot/pcp'...
$ git fetch origin 151d766b2d3f1fd48e01d22548892a5714976f13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcp
 * [new ref]         151d766b2d3f1fd48e01d22548892a5714976f13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 151d766 Further refine allowed platforms for pcp2arrow