388 def filtered_and_obsolete_hash(repo, maxrev):

   389     """build hashs of filtered and obsolete revisions in the current repoview.

   390 

   391     Multiple caches perform up-to-date validation by checking that the

   392     tiprev and tipnode stored in the cache file match the current repository.

   393     However, this is not sufficient for validating repoviews because the set

   394     of revisions in the view may change without the repository tiprev and

   395     tipnode changing.

   396 

   397     This function hashes all the revs filtered from the view up to maxrev and

   398     returns that SHA-1 digest. The obsolete revisions hashed are only the

   399     non-filtered one.

   400     """

   401     cl = repo.changelog

   402     obs_set = obsolete.getrevs(repo, b'obsolete')

   403     key = (maxrev, hash(cl.filteredrevs), hash(obs_set))

   404 

   405     result = cl._filteredrevs_hashcache.get(key)

   406     if result is None:

   407         filtered_hash = None

   408         obs_hash = None

   409         filtered_revs, obs_revs = _filtered_and_obs_revs(repo, maxrev)

   410         if filtered_revs:

   411             filtered_hash = _hash_revs(filtered_revs)

   412         if obs_revs:

   413             obs_hash = _hash_revs(obs_revs)

   414         result = (filtered_hash, obs_hash)

   415         cl._filteredrevs_hashcache[key] = result

   416     return result

   417 

   418