1 files changed, 37 insertions, 0 deletions
diff --git a/layman/overlays/source.py b/layman/overlays/source.py
index 8ed9d31..1cd6b5b 100644
--- a/layman/overlays/source.py
+++ b/layman/overlays/source.py
@@ -13,8 +13,45 @@
 # Author(s):
 #             Sebastian Pipping <sebastian@pipping.org>
 
+import os
 from layman.overlays.overlay import Overlay
 
 class OverlaySource(Overlay):
     def __init__(self, xml, config, ignore = 0, quiet = False):
         super(OverlaySource, self).__init__(xml, config, ignore, quiet)
+
+    def supported(self, binaries = []):
+        '''Is the overlay type supported?'''
+
+        if binaries:
+            for command, mtype, package in binaries:
+                found = False
+                if os.path.isabs(command):
+                    kind = 'Binary'
+                    found = os.path.exists(command)
+                else:
+                    kind = 'Command'
+                    for d in os.environ['PATH'].split(os.pathsep):
+                        f = os.path.join(d, command)
+                        if os.path.exists(f):
+                            found = True
+                            break
+
+                if not found:
+                    raise Exception(kind + ' ' + command + ' seems to be missing!'
+                                    ' Overlay type "' + mtype + '" not support'
+                                    'ed. Did you emerge ' + package + '?')
+
+        return True
+
+    def is_supported(self):
+        '''Is the overlay type supported?'''
+
+        try:
+            self.supported()
+            return True
+        except Exception, error:
+            return False
+
+    def command(self):
+        return self.config['%s_command' % self.__class__.type_key]