Integrate scanning into build

common.py

@@ -890,6 +890,45 @@ def prepare_source(vcs, app, build, build_dir, extlib_dir, sdk_path, ndk_path, j
     return root_dir
 
 
+# Scan the source code in the given directory (and all subdirectories)
+# and return a list of potential problems.
+def scan_source(source_dir):
+
+    problems = []
+
+    # Scan for common known non-free blobs:
+    usual_suspects = ['flurryagent',
+                      'paypal_mpl',
+                      'libgoogleanalytics',
+                      'admob-sdk-android',
+                      'googleadview',
+                      'googleadmobadssdk']
+    for r,d,f in os.walk(build_dir):
+        for curfile in f:
+            for suspect in usual_suspects:
+                if curfile.lower().find(suspect) != -1:
+                    msg = 'Found probable non-free blob ' + os.path.join(r, curfile)
+                    problems.append(msg)
+
+    # Presence of a jni directory without buildjni=yes might
+    # indicate a problem...
+    if (os.path.exists(os.path.join(root_dir, 'jni')) and 
+            thisbuild.get('buildjni', 'no') != 'yes'):
+        msg = 'Found jni directory, but buildjni is not enabled'
+        problems.append(msg)
+
+    # Presence of these is not a problem as such, but they
+    # shouldn't be there and mess up our source tarballs...
+    if os.path.exists(os.path.join(root_dir, 'bin')):
+        msg = "There shouldn't be a bin directory"
+        problems.append(msg)
+    if os.path.exists(os.path.join(root_dir, 'gen')):
+        msg = "There shouldn't be a gen directory"
+        problems.append(msg)
+
+    return problems
+
+
 class KnownApks:
 
     def __init__(self):