1 files changed, 36 insertions, 0 deletions

diff --git a/meta/lib/oe/license.py b/meta/lib/oe/license.py
index 7ab66e762f..3543cfe1f6 100644
--- a/meta/lib/oe/license.py
+++ b/meta/lib/oe/license.py
@@ -3,6 +3,7 @@
 
 import ast
 import re
+from fnmatch import fnmatchcase as fnmatch
 
 class InvalidLicense(StandardError):
     def __init__(self, license):
@@ -60,3 +61,38 @@ def flattened_licenses(licensestr, choose_licenses):
     flatten = FlattenVisitor(choose_licenses)
     flatten.visit_string(licensestr)
     return flatten.licenses
+
+def is_included(licensestr, whitelist=None, blacklist=None):
+    """Given a license string and whitelist and blacklist, determine if the
+    license string matches the whitelist and does not match the blacklist.
+
+    Returns a tuple holding the boolean state and a list of the applicable
+    licenses which were excluded (or None, if the state is True)
+    """
+
+    def include_license(license):
+        return (any(fnmatch(license, pattern) for pattern in whitelist) and not
+                any(fnmatch(license, pattern) for pattern in blacklist))
+
+    def choose_licenses(alpha, beta):
+        """Select the option in an OR which is the 'best' (has the most
+        included licenses)."""
+        alpha_weight = len(filter(include_license, alpha))
+        beta_weight = len(filter(include_license, beta))
+        if alpha_weight > beta_weight:
+            return alpha
+        else:
+            return beta
+
+    if not whitelist:
+        whitelist = ['*']
+
+    if not blacklist:
+        blacklist = []
+
+    licenses = flattened_licenses(licensestr, choose_licenses)
+    excluded = filter(lambda lic: not include_license(lic), licenses)
+    if excluded:
+        return False, excluded
+    else:
+        return True, None