$ git clone -n https://src.fedoraproject.org/rpms/pcp.git /var/lib/mock/f39-build-2221812-52690/root/chroot_tmpdir/scmroot/pcp
Cloning into '/var/lib/mock/f39-build-2221812-52690/root/chroot_tmpdir/scmroot/pcp'...
$ git fetch origin fc70568e935f8f4c88937cbe8fc17db9995ae7d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcp
 * [new ref]         fc70568e935f8f4c88937cbe8fc17db9995ae7d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc70568 Update to latest community sources