diff --git a/bin/is b/bin/is
index 0a7f08bc94c970931d49da5c22d283cf83458453..3f05cf357c2a2c0cd5cb96788016b6d02055b039 100755
--- a/bin/is
+++ b/bin/is
@@ -301,24 +301,9 @@ def c_install(args):
     image, repo = next(get_images([args.pattern], repoman, min=1, max=1))
     # Print setup information
     arrow(u"Installing %s v%s" % (image.name, image.version))
-    # install start time
-    t0 = time.time()
-    # run parser scripts with parser parser argument
-    image.run_parser({"parser": subparser})
-    # call parser again, with extended attributes
-    arrow("Parsing arguments")
-    # Catch exception in custom argparse action
-    try:
-        args = args.parser.parse_args()
-    except Exception as e:
-        raise ISError("Parsing error", e)
-    # run setup scripts
-    if not args.dry_run:
-        image.run_setup({"namespace": args})
-        # compute building time
-        t1 = time.time()
-        dt = int(t1 - t0)
-        arrow(u"Install time: %s" % datetime.timedelta(seconds=dt))
+    # let's go
+    dt = image.run(args.parser, subparser, run_setup=not args.dry_run)
+    arrow(u"Install time: %s" % datetime.timedelta(seconds=dt))
 
 def c_list(args):
     '''
diff --git a/installsystems/image.py b/installsystems/image.py
index 5f6d0af52680afb722999e9f71d32ca99979bc35..0e0edbc7b213f8f7079ac7de4843f34e4c997fe3 100644
--- a/installsystems/image.py
+++ b/installsystems/image.py
@@ -944,6 +944,40 @@ class PackageImage(Image):
                 arrow(u"Extracting payload %s in %s" % (payname, dest))
                 self.payload[payname].extract(dest, force=force)
 
+    def run(self, parser, extparser, load_modules=True, run_parser=True,
+            run_setup=True):
+        '''
+        Run images scripts
+
+        parser is the whole command line parser
+        extparser is the parser extensible by parser scripts
+
+        if load_modules is true load image modules
+        if run_parser is true run parser scripts
+        if run_setup is true run setup scripts
+        '''
+        # register start time
+        t0 = time.time()
+        # load image modules
+        if load_modules:
+            self.load_modules(lambda: self.select_scripts("lib"))
+        # run parser scripts to extend extparser
+        # those scripts should only extand the parser or produce error
+        if run_parser:
+            self.run_parser({"parser": extparser})
+        # call parser (again), with full options
+        arrow("Parsing command line")
+        # Catch exception in custom argparse action
+        try:
+            args = parser.parse_args()
+        except Exception as e:
+            raise ISError("Argument parser", e)
+        # run setup scripts
+        if run_setup:
+            self.run_setup({"namespace": args})
+        # return the building time
+        return int(time.time() - t0)
+
     def run_parser(self, global_dict):
         '''
         Run parser scripts