bitbake: cooker: Restore sys.path and sys.modules between parses

When memory resident bitbake is active and we re-parse, the old module
configuration is present which can lead to strange errors. Reset this
when reparsing so the state is consistent. This fixes memory resident
bitbake errors.

(Bitbake rev: 951942c3c284ec2c62e730e145688033190af9b2)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/cooker.py

@@ -159,6 +159,9 @@ class BBCooker:
             for f in featureSet:
                 self.featureset.setFeature(f)
 
+        self.orig_syspath = sys.path.copy()
+        self.orig_sysmodules = [*sys.modules]
+
         self.configuration = bb.cookerdata.CookerConfiguration()
 
         self.idleCallBackRegister = idleCallBackRegister
@@ -350,6 +353,11 @@ class BBCooker:
         self.state = state.initial
         self.caches_array = []
 
+        sys.path = self.orig_syspath.copy()
+        for mod in [*sys.modules]:
+            if mod not in self.orig_sysmodules:
+                del sys.modules[mod]
+
         # Need to preserve BB_CONSOLELOG over resets
         consolelog = None
         if hasattr(self, "data"):