$ git clone -n https://src.fedoraproject.org/rpms/cjose.git /var/lib/mock/f42-build-863081-171404/root/chroot_tmpdir/scmroot/cjose
Cloning into '/var/lib/mock/f42-build-863081-171404/root/chroot_tmpdir/scmroot/cjose'...
$ git fetch origin 3e9b581028ec5e1ccef7c999b1532d308a90a6b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cjose
 * [new ref]         3e9b581028ec5e1ccef7c999b1532d308a90a6b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e9b581 Rebuild for Jansson 2.14