$ git clone -n https://src.fedoraproject.org/rpms/parserng.git /var/lib/mock/f38-build-side-42-init-devel-1199796-30630/root/chroot_tmpdir/scmroot/parserng
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1199796-30630/root/chroot_tmpdir/scmroot/parserng'...
$ git fetch origin f45807cc818e99172451eea0b4f43a548b66f1f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/parserng
 * [new ref]         f45807cc818e99172451eea0b4f43a548b66f1f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f45807c Bumped to fresh and powerfull 1.9