fetch2: Sort file checksums by value, not path

Changing the path to a file could change the task hash even if the file
still has the same checksum. This occurs when the task depends on
multiple files and the sort order of their paths changes. Usually the
sorting is consistent because layers tend to have the same relative
paths, but this should take care of other configuations.

The problem arose when using a .bbappend to add files to a recipe in
another layer. If the layer is located alongside the other layers and
their parent directory is moved, the hash does not change. However,
moving the .bbappend layer outside of the common directory can change
the path sort order and the task hash.

Signed-off-by: Tyler Hall <tylerwhall@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/lib/bb/fetch2/__init__.py b/lib/bb/fetch2/__init__.py
index 150dc3c18f8a16a4674dfdb12286a5209bebc4bc..47463561e35e5b22f9c63c2de96d8830889ad88e 100644 (file)
--- a/lib/bb/fetch2/__init__.py
+++ b/lib/bb/fetch2/__init__.py
@@ -30,6 +30,7 @@ from __future__ import print_function
 import os, re
 import logging
 import urllib
+import operator
 import bb.persist_data, bb.utils
 import bb.checksum
 from bb import data
@@ -729,7 +730,7 @@ def get_file_checksums(filelist, pn):
         if checksum:
             checksums.append((pth, checksum))
 
-    checksums.sort()
+    checksums.sort(key=operator.itemgetter(1))
     return checksums