$ git clone -n https://src.fedoraproject.org/rpms/jetty.git /var/lib/mock/f42-build-3355598-45025/root/chroot_tmpdir/scmroot/jetty
Cloning into '/var/lib/mock/f42-build-3355598-45025/root/chroot_tmpdir/scmroot/jetty'...
$ git fetch origin 52be2db170d1045393f70ff82780d8ef1a5f7355:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jetty
 * [new ref]         52be2db170d1045393f70ff82780d8ef1a5f7355 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52be2db Add sysusers.d config file to allow rpm to create users/groups automatically