$ git clone -n https://src.fedoraproject.org/rpms/retrace-client.git /var/lib/mock/f39-build-2548004-61915/root/chroot_tmpdir/scmroot/retrace-client
Cloning into '/var/lib/mock/f39-build-2548004-61915/root/chroot_tmpdir/scmroot/retrace-client'...
$ git fetch origin 1a5e17b6b212516e7871a3f862dc0a6f853d8cd6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/retrace-client
 * [new ref]         1a5e17b6b212516e7871a3f862dc0a6f853d8cd6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a5e17b Initial setup of the repo