bitbake/siggen.py: Fix whitelisted variable handling

Even when a variable was whitelisted, any dependencies of that variable
could still creep into the task hash due to the way the whitelisting
code worked. This patch changes thing to ensure that when whitelisted,
that whitelisting applies to the variable and any dependencies it has.

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

1 files changed, 21 insertions, 6 deletions

diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index 4dc09b3f9e..010c2cab26 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -57,7 +57,7 @@ class SignatureGeneratorBasic(SignatureGenerator):
         self.runtaskdeps = {}
         self.gendeps = {}
         self.lookupcache = {}
-        self.basewhitelist = (data.getVar("BB_HASHBASE_WHITELIST", True) or "").split()
+        self.basewhitelist = set((data.getVar("BB_HASHBASE_WHITELIST", True) or "").split())
         self.taskwhitelist = data.getVar("BB_HASHTASK_WHITELIST", True) or None
 
         if self.taskwhitelist:
@@ -67,17 +67,31 @@ class SignatureGeneratorBasic(SignatureGenerator):
 
     def _build_data(self, fn, d):
 
-        taskdeps, gendeps = bb.data.generate_dependencies(d)
+        tasklist, gendeps = bb.data.generate_dependencies(d)
 
+        taskdeps = {}
         basehash = {}
         lookupcache = {}
 
-        for task in taskdeps:
+        for task in tasklist:
             data = d.getVar(task, False)
             lookupcache[task] = data
-            for dep in sorted(taskdeps[task]):
-                if dep in self.basewhitelist:
-                    continue
+
+            newdeps = gendeps[task]
+            seen = set()
+            while newdeps:
+                nextdeps = newdeps
+                seen |= nextdeps
+                newdeps = set()
+                for dep in nextdeps:
+                    if dep in self.basewhitelist:
+                        continue
+                    newdeps |= gendeps[dep]
+                newdeps -= seen
+
+            alldeps = seen - self.basewhitelist
+
+            for dep in sorted(alldeps):
                 if dep in lookupcache:
                     var = lookupcache[dep]
                 else:
@@ -88,6 +102,7 @@ class SignatureGeneratorBasic(SignatureGenerator):
             if data is None:
                 bb.error("Task %s from %s seems to be empty?!" % (task, fn))
             self.basehash[fn + "." + task] = hashlib.md5(data).hexdigest()
+            taskdeps[task] = sorted(alldeps)
 
         self.taskdeps[fn] = taskdeps
         self.gendeps[fn] = gendeps