diffoscope/comparators/apk.py

@@ -29,7 +29,7 @@ from diffoscope.difference import Difference
 from .utils.file import File
 from .utils.archive import Archive
 from .utils.compare import compare_files
-from .zip import Zipinfo, ZipinfoVerbose
+from .zip import zipinfo_differences
 from .missing_file import MissingFile
 
 logger = logging.getLogger(__name__)
@@ -67,12 +67,13 @@ class ApkContainer(Archive):
             stdout=subprocess.PIPE,
         )
 
-        # Optionally extract the classes.dex file; apktool does not do this.
-        subprocess.call(
-            ('unzip', '-d', self._unpacked, self.source.path, 'classes.dex'),
-            stderr=subprocess.PIPE,
-            stdout=subprocess.PIPE,
-        )
+        # Optionally extract a few files that apktool does not
+        for x in ('classes.dex', 'resources.arsc'):
+            subprocess.call(
+                ('unzip', '-d', self._unpacked, self.source.path, x),
+                stderr=subprocess.PIPE,
+                stdout=subprocess.PIPE,
+            )
 
         for root, _, files in os.walk(self._unpacked):
             current_dir = []
@@ -175,10 +176,7 @@ class ApkFile(File):
     CONTAINER_CLASS = ApkContainer
 
     def compare_details(self, other, source=None):
-        zipinfo_difference = Difference.from_command(
-            Zipinfo, self.path, other.path
-        ) or Difference.from_command(ZipinfoVerbose, self.path, other.path)
-        return [zipinfo_difference]
+        return zipinfo_differences(self, other)
 
 
 def filter_apk_metadata(filepath, archive_name):

diffoscope/comparators/zip.py

@@ -125,6 +125,20 @@ class BsdtarVerbose(Command):
         return ['bsdtar', '-tvf', self.path]
 
 
+def zipinfo_differences(file, other):
+    """
+    Run all our zipinfo variants.
+    """
+
+    for x in (Zipinfo, ZipinfoVerbose, BsdtarVerbose):
+        result = Difference.from_command(x, file.path, other.path)
+        # We only return the 'best' one
+        if result is not None:
+            return [result]
+
+    return []
+
+
 class ZipDirectory(Directory, ArchiveMember):
     def __init__(self, archive, member_name):
         ArchiveMember.__init__(self, archive, member_name)
@@ -192,20 +206,11 @@ class ZipFile(File):
 
     def compare_details(self, other, source=None):
         differences = []
-        zipinfo_difference = None
         if Config().exclude_directory_metadata != 'recursive':
-            for x in (Zipinfo, ZipinfoVerbose, BsdtarVerbose):
-                zipinfo_difference = Difference.from_command(
-                    x, self.path, other.path
-                )
-                if zipinfo_difference:
-                    break
-        zipnote_difference = Difference.from_command(
-            Zipnote, self.path, other.path
+            differences.extend(zipinfo_differences(self, other))
+        differences.append(
+            Difference.from_command(Zipnote, self.path, other.path)
         )
-        for x in (zipinfo_difference, zipnote_difference):
-            if x is not None:
-                differences.append(x)
         return differences