$ git clone -n https://src.fedoraproject.org/rpms/prometheus-jmx-exporter.git /var/lib/mock/f41-build-1276956-23150/root/chroot_tmpdir/scmroot/prometheus-jmx-exporter
Cloning into '/var/lib/mock/f41-build-1276956-23150/root/chroot_tmpdir/scmroot/prometheus-jmx-exporter'...
$ git fetch origin 5479c8064eefafb87930f564198262bead39be9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/prometheus-jmx-exporter
 * [new ref]         5479c8064eefafb87930f564198262bead39be9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5479c80 Orphaned for 6+ weeks