+grep -sq '^add_drive.*test1.img.*readonly:true' test.out
+! grep -sq '^add_drive.*test1.img.*format' test.out
+grep -sq '^add_drive.*test2.img.*readonly:true.*format:raw' test.out
+grep -sq '^add_drive.*test3.img.*readonly:true.*format:qcow2' test.out