added checksum support to package database fetch

1 files changed, 23 insertions, 4 deletions

diff --git a/g_octave/checksum.py b/g_octave/checksum.py
index 79fe969..c5ead44 100644
--- a/g_octave/checksum.py
+++ b/g_octave/checksum.py
@@ -5,7 +5,7 @@
     ~~~~~~~~~~~
     
     This module implements functions for compute/generate SHA1 checksums
-    for files.
+    for DESCRIPTION files.
     
     :copyright: (c) 2010 by Rafael Goncalves Martins
     :license: GPL-2, see LICENSE for more details.
@@ -16,15 +16,34 @@ from __future__ import absolute_import
 __all__ = [
     'sha1_compute',
     'sha1_check',
+    'sha1_check_db',
 ]
 
-from .compat import open
 from hashlib import sha1
+import json
+import os
+
+from .config import Config
+config = Config(True)
 
 
 def sha1_compute(filename):
     with open(filename) as fp:
         return sha1(fp.read()).hexdigest()
 
-def sha1_check(filename, checksum):
-    return sha1_compute(filename) == checksum
+def sha1_check(db, p):
+    description = db[p]
+    manifest = {}
+    with open(os.path.join(config.db, 'manifest.json')) as fp:
+        manifest = json.load(fp)
+    if p not in manifest:
+        return False
+    return manifest[p] == description.sha1sum()
+
+def sha1_check_db(db):
+    for cat in db.pkg_list:
+        for pkg in db.pkg_list[cat]:
+            p = pkg['name']+'-'+pkg['version']
+            if not sha1_check(db, p):
+                return False
+    return True