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utils/checkpackagelib/lib_mk.py: fix check for overridden variable

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Currently this .mk snippet results in unexpected behavior from
check-package:
|VAR_1 = VALUE1
|ifeq (condition)
|VAR_1 := $(VAR_1), VALUE2
|endif

Fix commit "163f160a8e utils/{check-package, checkpackagelib}:
consistently use raw strings for re.compile" that ended up doing this:
-    CONCATENATING = re.compile("^([A-Z0-9_]+)\s*(\+|:|)=\s*\$\(\\1\)")
+    CONCATENATING = re.compile(r"^([A-Z0-9_]+)\s*(\+|:|)=\s*\$\(\\1\)")

But raw strings do not expect escaping when referencing \1 and the
pattern ends up searching for a raw '\\1' instead of an occurrence of
the first pattern inside parenthesis.

|$ python3
|Python 3.8.10 (default, Sep 28 2021, 16:10:42)
|[GCC 9.3.0] on linux
|Type "help", "copyright", "credits" or "license" for more information.
|>>> import re
|>>> p1 = re.compile('(foo)bar\\1')
|>>> p2 = re.compile(r'(foo)bar\\1')
|>>> p3 = re.compile(r'(foo)bar\1')
|>>> s1 = 'foobarfoo'
|>>> s2 = 'foobar\\1'
|>>> print(p1.search(s1))
|<re.Match object; span=(0, 9), match='foobarfoo'>
|>>> print(p2.search(s1))
|None
|>>> print(p3.search(s1))
|<re.Match object; span=(0, 9), match='foobarfoo'>
|>>> print(p1.search(s2))
|None
|>>> print(p2.search(s2))
|<re.Match object; span=(0, 8), match='foobar\\1'>
|>>> print(p3.search(s2))
|None
|>>>

So use '\1' instead of '\\1' in the raw string.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Ricardo Martincoski 2021-11-15 20:53:36 -03:00 committed by Arnout Vandecappelle (Essensium/Mind)
parent c06bed7296
commit 5bbedea9c2
1 changed files with 1 additions and 1 deletions
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utils/checkpackagelib/lib_mk.py
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@ -77,7 +77,7 @@ class Indent(_CheckFunction):
class OverriddenVariable(_CheckFunction):
CONCATENATING = re.compile(r"^([A-Z0-9_]+)\s*(\+|:|)=\s*\$\(\\1\)")
CONCATENATING = re.compile(r"^([A-Z0-9_]+)\s*(\+|:|)=\s*\$\(\1\)")
END_CONDITIONAL = re.compile(r"^\s*({})".format("|".join(end_conditional)))
OVERRIDING_ASSIGNMENTS = [':=', "="]
START_CONDITIONAL = re.compile(r"^\s*({})".format("|".join(start_conditional)))