$ git clone -n https://src.fedoraproject.org/forks/fkrenzel/rpms/ca-certificates.git /var/lib/mock/f43-build-61074752-6588604/root/chroot_tmpdir/scmroot/ca-certificates
Cloning into '/var/lib/mock/f43-build-61074752-6588604/root/chroot_tmpdir/scmroot/ca-certificates'...
$ git fetch origin 82f4d89946d81442731aef5d8c85ffc6e0792ee0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/fkrenzel/rpms/ca-certificates
 * [new ref]         82f4d89946d81442731aef5d8c85ffc6e0792ee0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82f4d89 Drop /etc/pki/tls/cert.pem and bundles in .../tls/certs/