$ git clone -n https://src.fedoraproject.org/rpms/jctools.git /var/lib/mock/eln-build-side-115277-61089201-6588857/root/chroot_tmpdir/scmroot/jctools
Cloning into '/var/lib/mock/eln-build-side-115277-61089201-6588857/root/chroot_tmpdir/scmroot/jctools'...
$ git fetch origin 383a5d024e9e021b89f8528108d4ff12ff7416f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jctools
 * [new ref]         383a5d024e9e021b89f8528108d4ff12ff7416f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 383a5d0 Update to upstream version 4.0.5