$ git clone -n https://src.fedoraproject.org/rpms/certmonger.git /var/lib/mock/f42-build-863080-171404/root/chroot_tmpdir/scmroot/certmonger
Cloning into '/var/lib/mock/f42-build-863080-171404/root/chroot_tmpdir/scmroot/certmonger'...
$ git fetch origin fe76a479b4dbf994f179ff63a7166a35d68f5095:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/certmonger
 * [new ref]         fe76a479b4dbf994f179ff63a7166a35d68f5095 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe76a47 Rebuild for Jansson 2.14