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authorJohan Dahlin <johan@gnome.org>2010-06-10 14:27:16 -0300
committerJohan Dahlin <johan@gnome.org>2010-06-10 16:49:18 -0300
commite472079ae99e4ca36a31cb563d19fdb3b2807d9e (patch)
treedf293410b1b8aaed1c7e5ceab1c0e0e8bd0b061e /giscanner/cachestore.py
parent1175ebe5d84bec58acc082c3077af138cad1f54e (diff)
downloadgobject-introspection-e472079ae99e4ca36a31cb563d19fdb3b2807d9e.tar.gz
[cachestore] Add versioning
Version the cache by checking the SHA1 of the content of all python source files. If the SHA1 hash differs, just regenerate the cache. https://bugzilla.gnome.org/show_bug.cgi?id=568842
Diffstat (limited to 'giscanner/cachestore.py')
-rw-r--r--giscanner/cachestore.py51
1 files changed, 50 insertions, 1 deletions
diff --git a/giscanner/cachestore.py b/giscanner/cachestore.py
index e127dda1..70ca00ad 100644
--- a/giscanner/cachestore.py
+++ b/giscanner/cachestore.py
@@ -1,6 +1,6 @@
# -*- Mode: Python -*-
# GObject-Introspection - a framework for introspecting GObject libraries
-# Copyright (C) 2008 Johan Dahlin
+# Copyright (C) 2008-2010 Johan Dahlin
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
@@ -20,11 +20,25 @@
import errno
import cPickle
+import glob
import hashlib
import os
import shutil
+import sys
import tempfile
+import giscanner
+
+_CACHE_VERSION_FILENAME = '.cache-version'
+
+def _get_versionhash():
+ toplevel = os.path.dirname(giscanner.__file__)
+ # Use pyc instead of py to avoid extra IO
+ sources = glob.glob(os.path.join(toplevel, '*.pyc'))
+ sources.append(sys.argv[0])
+ # Using mtimes is a bit (5x) faster than hashing the file contents
+ mtimes = (str(os.stat(source).st_mtime) for source in sources)
+ return hashlib.sha1(''.join(mtimes)).hexdigest()
def _get_cachedir():
homedir = os.environ.get('HOME')
@@ -59,6 +73,35 @@ class CacheStore(object):
raise
self._directory = None
+ self._check_cache_version()
+
+ def _check_cache_version(self):
+ current_hash = _get_versionhash()
+ version = os.path.join(self._directory, _CACHE_VERSION_FILENAME)
+ try:
+ cache_hash = open(version).read()
+ except IOError, e:
+ # File does not exist
+ if e.errno == errno.ENOENT:
+ cache_hash = 0
+ else:
+ raise
+
+ if current_hash == cache_hash:
+ return
+
+ self._clean()
+ try:
+ fp = open(version, 'w')
+ except IOError, e:
+ # Permission denied
+ if e.errno == errno.EACCES:
+ return
+ else:
+ raise
+
+ fp.write(current_hash)
+
def _get_filename(self, filename):
# If we couldn't create the directory we're probably
# on a read only home directory where we just disable
@@ -88,6 +131,12 @@ class CacheStore(object):
else:
raise
+ def _clean(self):
+ for filename in os.listdir(self._directory):
+ if filename == _CACHE_VERSION_FILENAME:
+ continue
+ self._remove_filename(filename)
+
def store(self, filename, data):
store_filename = self._get_filename(filename)
if store_filename is None: