Fix '--offline' implementation to take into account multiple SCMs

Author: screamerbg

mbed/mbed.py

@@ -1221,7 +1221,7 @@ def clone(self, url, path, rev=None, depth=None, protocol=None, offline=False, *
             # Main clone routine if the clone with cache ref failed (might occur if cache ref is dirty)
             if main:
                 if offline:
-                    error("Unable to clone repository \"%s\" in offline mode ('--offline' used)." % url)
+                    continue
                 try:
                     scm.clone(url, path, depth=depth, protocol=protocol, **kwargs)
                 except ProcessException:
@@ -1236,6 +1236,11 @@ def clone(self, url, path, rev=None, depth=None, protocol=None, offline=False, *
             self.set_cache(url)
             return True
 
+        if offline:
+            error("Unable to clone repository \"%s\" in offline mode ('--offline' used)." % url)
+            if os.path.isdir(path):
+                rmtree_readonly(path)
+
         return False
 
     def getlibs(self):