yocto-compat-layer.py: apply test_signatures to all layers

Software layers were previously allowed to change signatures, but
that's not desired for those layers either. The rule that a layer
which is "Yocto Compatible 2.0" must not change signatures unless
explicitly requested holds for all kinds of layers.

However, as this is something that software layers might not be able
to do right away, testing for signature changes in software layers can
be disabled. It's on by default, as that was Richard's
recommendation. Whether that should change needs further discussion as
part of finalizing "Yocto Compatible 2.0".

As it might still change, the tool now has both a with/without
parameter so that users of the tool can choose the desired behavior
without being affected by future changes to the default.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

3 files changed, 14 insertions, 6 deletions

diff --git a/scripts/lib/compatlayer/cases/common.py b/scripts/lib/compatlayer/cases/common.py
index 2dfcbb1c32..a1cdbab51e 100644
--- a/scripts/lib/compatlayer/cases/common.py
+++ b/scripts/lib/compatlayer/cases/common.py
@@ -27,8 +27,9 @@ class CommonCompatLayer(OECompatLayerTestCase):
                       'bitbake -e')
 
     def test_signatures(self):
-        if self.tc.layer['type'] == LayerType.SOFTWARE:
-            raise unittest.SkipTest("Layer %s isn't BSP or DISTRO one." \
+        if self.tc.layer['type'] == LayerType.SOFTWARE and \
+           not self.tc.test_software_layer_signatures:
+            raise unittest.SkipTest("Not testing for signature changes in a software layer %s." \
                      % self.tc.layer['name'])
 
         # task -> (old signature, new signature)
diff --git a/scripts/lib/compatlayer/context.py b/scripts/lib/compatlayer/context.py
index 4932238798..7811d4ac20 100644
--- a/scripts/lib/compatlayer/context.py
+++ b/scripts/lib/compatlayer/context.py
@@ -9,6 +9,7 @@ import re
 from oeqa.core.context import OETestContext
 
 class CompatLayerTestContext(OETestContext):
-    def __init__(self, td=None, logger=None, layer=None):
+    def __init__(self, td=None, logger=None, layer=None, test_software_layer_signatures=True):
         super(CompatLayerTestContext, self).__init__(td, logger)
         self.layer = layer
+        self.test_software_layer_signatures = test_software_layer_signatures
diff --git a/scripts/yocto-compat-layer.py b/scripts/yocto-compat-layer.py
index 0d5700b538..ba64b4d6e4 100755
--- a/scripts/yocto-compat-layer.py
+++ b/scripts/yocto-compat-layer.py
@@ -30,12 +30,12 @@ CASES_PATHS = [os.path.join(os.path.abspath(os.path.dirname(__file__)),
                 'lib', 'compatlayer', 'cases')]
 logger = scriptutils.logger_create(PROGNAME, stream=sys.stdout)
 
-def test_layer_compatibility(td, layer):
+def test_layer_compatibility(td, layer, test_software_layer_signatures):
     from compatlayer.context import CompatLayerTestContext
     logger.info("Starting to analyze: %s" % layer['name'])
     logger.info("----------------------------------------------------------------------")
 
-    tc = CompatLayerTestContext(td=td, logger=logger, layer=layer)
+    tc = CompatLayerTestContext(td=td, logger=logger, layer=layer, test_software_layer_signatures=test_software_layer_signatures)
     tc.loadTests(CASES_PATHS)
     return tc.runTests()
 
@@ -53,6 +53,12 @@ def main():
             help='List of MACHINEs to be used during testing', action='store')
     parser.add_argument('--additional-layers', nargs="+",
             help='List of additional layers to add during testing', action='store')
+    group = parser.add_mutually_exclusive_group()
+    group.add_argument('--with-software-layer-signature-check', action='store_true', dest='test_software_layer_signatures',
+                       default=True,
+                       help='check that software layers do not change signatures (on by default)')
+    group.add_argument('--without-software-layer-signature-check', action='store_false', dest='test_software_layer_signatures',
+                       help='disable signature checking for software layers')
     parser.add_argument('-n', '--no-auto', help='Disable auto layer discovery',
             action='store_true')
     parser.add_argument('-d', '--debug', help='Enable debug output',
@@ -173,7 +179,7 @@ def main():
             layers_tested = layers_tested + 1
             continue
 
-        result = test_layer_compatibility(td, layer)
+        result = test_layer_compatibility(td, layer, args.test_software_layer_signatures)
         results[layer['name']] = result
         results_status[layer['name']] = 'PASS' if results[layer['name']].wasSuccessful() else 'FAIL'
         layers_tested = layers_tested + 1