$ git clone -n https://src.fedoraproject.org/rpms/erlang-pkix.git /var/lib/mock/f40-build-1937370-25150/root/chroot_tmpdir/scmroot/erlang-pkix
Cloning into '/var/lib/mock/f40-build-1937370-25150/root/chroot_tmpdir/scmroot/erlang-pkix'...
$ git fetch origin 2f132865e59a21150167f973dea5a89b46cdcf23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-pkix
 * [new ref]         2f132865e59a21150167f973dea5a89b46cdcf23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f13286 pkix ver. 1.0.10