$ git clone -n https://src.fedoraproject.org/rpms/jzlib.git /var/lib/mock/f40-build-2056265-49121/root/chroot_tmpdir/scmroot/jzlib
Cloning into '/var/lib/mock/f40-build-2056265-49121/root/chroot_tmpdir/scmroot/jzlib'...
$ git fetch origin 6d88c728f869d6c490babf38324ea54b79fb1643:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jzlib
 * [new ref]         6d88c728f869d6c490babf38324ea54b79fb1643 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d88c72 Update javapackages test plan to f40