add check mode support

Could it be that easy or do I have missed something?

packaging/pkgng

@@ -89,9 +89,10 @@ def remove_packages(module, pkgin_path, packages):
         if not query_package(module, pkgin_path, package):
             continue
 
-        rc, out, err = module.run_command("%s delete -y %s" % (pkgin_path, package))
+        if not module.check_mode:
+            rc, out, err = module.run_command("%s delete -y %s" % (pkgin_path, package))
 
-        if query_package(module, pkgin_path, package):
+        if not module.check_mode and query_package(module, pkgin_path, package):
             module.fail_json(msg="failed to remove %s: %s" % (package, out))
     
         remove_c += 1
@@ -110,7 +111,7 @@ def install_packages(module, pkgin_path, packages, cached, pkgsite):
     if pkgsite != "":
         pkgsite="PACKAGESITE=%s" % (pkgsite)
 
-    if cached == "no":
+    if not module.check_mode and cached == "no":
         rc, out, err = module.run_command("%s %s update" % (pkgsite, pkgin_path))
         if rc != 0:
             module.fail_json(msg="Could not update catalogue")
@@ -119,9 +120,10 @@ def install_packages(module, pkgin_path, packages, cached, pkgsite):
         if query_package(module, pkgin_path, package):
             continue
 
-        rc, out, err = module.run_command("%s %s install -U -y %s" % (pkgsite, pkgin_path, package))
+        if not module.check_mode:
+            rc, out, err = module.run_command("%s %s install -U -y %s" % (pkgsite, pkgin_path, package))
 
-        if not query_package(module, pkgin_path, package):
+        if not module.check_mode and query_package(module, pkgin_path, package):
             module.fail_json(msg="failed to install %s: %s" % (package, out))
 
         install_c += 1
@@ -134,11 +136,12 @@ def install_packages(module, pkgin_path, packages, cached, pkgsite):
 
 def main():
     module = AnsibleModule(
-            argument_spec    = dict(
-                state        = dict(default="present", choices=["present","absent"]),
-                name         = dict(aliases=["pkg"], required=True),
-                cached       = dict(default="no", required=False, choices=["yes","no"]),
-                pkgsite      = dict(default="", required=False)))
+            argument_spec       = dict(
+                state           = dict(default="present", choices=["present","absent"]),
+                name            = dict(aliases=["pkg"], required=True),
+                cached          = dict(default="supports_check_modeno", required=False, choices=["yes","no"]),
+                pkgsite         = dict(default="", required=False))
+            supports_check_mode = True)
 
     pkgin_path = module.get_bin_path('pkg', True)