bitbake: siggen: Remove full path from unitaskhashes keys

The full paths make the cache useless in the sdk. They also bloat the
cache size. They're for human debugging benefit only so compromise and
reduce this to the filename.

(Bitbake rev: 3b275c4083eae1d3781f0862919af9de83932b0f)

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

bitbake/lib/bb/siggen.py

@@ -386,7 +386,7 @@ class SignatureGeneratorUniHashMixIn(object):
     def __get_task_unihash_key(self, tid):
         # TODO: The key only *needs* to be the taskhash, the tid is just
         # convenient
-        return '%s:%s' % (tid, self.taskhash[tid])
+        return '%s:%s' % (tid.rsplit("/", 1)[1], self.taskhash[tid])
 
     def get_stampfile_hash(self, tid):
         if tid in self.taskhash:
@@ -457,7 +457,7 @@ class SignatureGeneratorUniHashMixIn(object):
         tempdir = d.getVar('T')
         fn = d.getVar('BB_FILENAME')
         tid = fn + ':do_' + task
-        key = tid + ':' + taskhash
+        key = tid.rsplit("/", 1)[1] + ':' + taskhash
 
         if self.setscenetasks and tid not in self.setscenetasks:
             return