$ git clone -n https://src.fedoraproject.org/rpms/valijson.git /var/lib/mock/f42-build-side-1-3497630-45961/root/chroot_tmpdir/scmroot/valijson
Cloning into '/var/lib/mock/f42-build-side-1-3497630-45961/root/chroot_tmpdir/scmroot/valijson'...
$ git fetch origin 5c94b72b477c473e276b8aa2682e298f5f43a72e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/valijson
 * [new ref]         5c94b72b477c473e276b8aa2682e298f5f43a72e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c94b72 Add Packit config