$ git clone -n https://src.fedoraproject.org/rpms/golang-contrib-opencensus-exporter-ocagent.git /var/lib/mock/f41-build-1039875-18909/root/chroot_tmpdir/scmroot/golang-contrib-opencensus-exporter-ocagent
Cloning into '/var/lib/mock/f41-build-1039875-18909/root/chroot_tmpdir/scmroot/golang-contrib-opencensus-exporter-ocagent'...
$ git fetch origin b21cb01433d7888c16393792d3777dacc6159313:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-contrib-opencensus-exporter-ocagent
 * [new ref]         b21cb01433d7888c16393792d3777dacc6159313 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b21cb01 Fix FTBFS