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Reproducible build: Ensure apkdiff.py works properly again

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The recent switch to Python3 (2ccdf0e396) introduced a regression
that led to file content no longer being compared:

   In compareEntries(), two generators/iterators are created:

     sourceInfoList      = filter(lambda sourceInfo: …, sourceZip.infolist())
     destinationInfoList = filter(lambda destinationInfo: …, destinationZip.infolist())

   Few lines later, those are exhausted:

     if len(sourceInfoList) != len(destinationInfoList):

   Yet another few lines later, the exhausted generator is used again:

     for sourceEntryInfo in sourceInfoList:
        …          # <-- unreachable

This is caused by behavioral differences between Python2 and Python3:

   user@z_signal:~$ python2
   Python 2.7.13 (default, Sep 26 2018, 18:42:22)
   [GCC 6.3.0 20170516] on linux2
   Type "help", "copyright", "credits" or "license" for more information.
   >>> f = filter(lambda i: i % 2 == 0, [0, 1, 2, 3, 4, 5, 6])
   >>> list(f)
   [0, 2, 4, 6]
   >>> list(f)
   [0, 2, 4, 6]
   >>>

   user@z_signal:~$ python3
   Python 3.5.3 (default, Sep 27 2018, 17:25:39)
   [GCC 6.3.0 20170516] on linux
   Type "help", "copyright", "credits" or "license" for more information.
   >>> f = filter(lambda i: i % 2 == 0, [0, 1, 2, 3, 4, 5, 6])
   >>> list(f)
   [0, 2, 4, 6]
   >>> list(f)
   []
   >>>
This commit is contained in:
Peter Gerber 2019-05-11 12:00:58 +02:00 • committed by Greyson Parrelli
parent 4e64242883
commit b6dc25a368
1 changed files with 4 additions and 4 deletions
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8
apkdiff/apkdiff.py
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@ -35,10 +35,10 @@ class ApkDiff:
return True
def compareEntries(self, sourceZip, destinationZip):
sourceInfoList = filter(lambda sourceInfo: sourceInfo.filename not in self.IGNORE_FILES, sourceZip.infolist())
destinationInfoList = filter(lambda destinationInfo: destinationInfo.filename not in self.IGNORE_FILES, destinationZip.infolist())
sourceInfoList = list(filter(lambda sourceInfo: sourceInfo.filename not in self.IGNORE_FILES, sourceZip.infolist()))
destinationInfoList = list(filter(lambda destinationInfo: destinationInfo.filename not in self.IGNORE_FILES, destinationZip.infolist()))
if len(list(sourceInfoList)) != len(list(destinationInfoList)):
if len(sourceInfoList) != len(destinationInfoList):
print("APK info lists of different length!")
return False
@ -61,7 +61,7 @@ class ApkDiff:
sourceChunk = sourceFile.read(1024)
destinationChunk = destinationFile.read(1024)
while sourceChunk != "" or destinationChunk != "":
while sourceChunk != b"" or destinationChunk != b"":
if sourceChunk != destinationChunk:
return False