check-package: fix Python3 support

This script currently uses "/usr/bin/env python" as shebang but it does
not really support Python3. Instead of limiting the script to Python2,
fix it to support both versions.

So change all imports to absolute imports because Python3 follows PEP328
and dropped implicit relative imports.

In order to avoid errors when decoding files with the default 'utf-8'
codec, use errors="surrogateescape" when opening files, the docs for
open() states: "This is useful for processing files in an unknown
encoding.". This argument is not compatible with Python2 open() so
import 'six' to use it only when running in Python3.
As a consequence the file handler becomes explicit, so use it to close()
the file after it got processed.

This "surrogateescape" is a simple alternative to the complete solution
of opening files with "rb" and changing all functions in the lib*.py
files to use bytes objects instead of strings. The only case we can have
non-ascii/non-utf-8 files being checked by the script are for patch
files when the upstream file to be patched is not ascii or utf-8. There
is currently one case in the tree:
package/urg/0002-urg-gcc6-fix-narrowing-conversion.patch.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Reviewed-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Tested-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 02b165dc71fa1aafe04ba0c69281d3ae4c0c974b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

utils/check-package

@@ -5,6 +5,7 @@ from __future__ import print_function
 import argparse
 import inspect
 import re
+import six
 import sys
 
 import checkpackagelib.lib_config
@@ -103,10 +104,15 @@ def check_file_using_lib(fname):
 
     for cf in objects:
         nwarnings += print_warnings(cf.before())
-    for lineno, text in enumerate(open(fname, "r").readlines()):
+    if six.PY3:
+        f = open(fname, "r", errors="surrogateescape")
+    else:
+        f = open(fname, "r")
+    for lineno, text in enumerate(f.readlines()):
         nlines += 1
         for cf in objects:
             nwarnings += print_warnings(cf.check_line(lineno + 1, text))
+    f.close()
     for cf in objects:
         nwarnings += print_warnings(cf.after())
 

utils/checkpackagelib/lib.py

@@ -1,6 +1,6 @@
 # See utils/checkpackagelib/readme.txt before editing this file.
 
-from base import _CheckFunction
+from checkpackagelib.base import _CheckFunction
 
 
 class ConsecutiveEmptyLines(_CheckFunction):

utils/checkpackagelib/lib_config.py

@@ -5,11 +5,11 @@
 
 import re
 
-from base import _CheckFunction
-from lib import ConsecutiveEmptyLines  # noqa: F401
-from lib import EmptyLastLine          # noqa: F401
-from lib import NewlineAtEof           # noqa: F401
-from lib import TrailingSpace          # noqa: F401
+from checkpackagelib.base import _CheckFunction
+from checkpackagelib.lib import ConsecutiveEmptyLines  # noqa: F401
+from checkpackagelib.lib import EmptyLastLine          # noqa: F401
+from checkpackagelib.lib import NewlineAtEof           # noqa: F401
+from checkpackagelib.lib import TrailingSpace          # noqa: F401
 
 
 def _empty_or_comment(text):

utils/checkpackagelib/lib_hash.py

@@ -5,11 +5,11 @@
 
 import re
 
-from base import _CheckFunction
-from lib import ConsecutiveEmptyLines  # noqa: F401
-from lib import EmptyLastLine          # noqa: F401
-from lib import NewlineAtEof           # noqa: F401
-from lib import TrailingSpace          # noqa: F401
+from checkpackagelib.base import _CheckFunction
+from checkpackagelib.lib import ConsecutiveEmptyLines  # noqa: F401
+from checkpackagelib.lib import EmptyLastLine          # noqa: F401
+from checkpackagelib.lib import NewlineAtEof           # noqa: F401
+from checkpackagelib.lib import TrailingSpace          # noqa: F401
 
 
 def _empty_line_or_comment(text):

utils/checkpackagelib/lib_mk.py

@@ -6,11 +6,11 @@
 
 import re
 
-from base import _CheckFunction
-from lib import ConsecutiveEmptyLines  # noqa: F401
-from lib import EmptyLastLine          # noqa: F401
-from lib import NewlineAtEof           # noqa: F401
-from lib import TrailingSpace          # noqa: F401
+from checkpackagelib.base import _CheckFunction
+from checkpackagelib.lib import ConsecutiveEmptyLines  # noqa: F401
+from checkpackagelib.lib import EmptyLastLine          # noqa: F401
+from checkpackagelib.lib import NewlineAtEof           # noqa: F401
+from checkpackagelib.lib import TrailingSpace          # noqa: F401
 
 
 class Indent(_CheckFunction):

utils/checkpackagelib/lib_patch.py

@@ -5,8 +5,8 @@
 
 import re
 
-from base import _CheckFunction
-from lib import NewlineAtEof           # noqa: F401
+from checkpackagelib.base import _CheckFunction
+from checkpackagelib.lib import NewlineAtEof           # noqa: F401
 
 
 class ApplyOrder(_CheckFunction):