lint: Convert lint-python-utf8-encoding.sh to Python

Author: Kvaciral

test/lint/lint-python-utf8-encoding.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2018-2022 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# Make sure we explicitly open all text files using UTF-8 (or ASCII) encoding to
+# avoid potential issues on the BSDs where the locale is not always set.
+
+import sys
+import re
+
+from subprocess import check_output, CalledProcessError
+
+EXCLUDED_DIRS = ["src/crc32c/"]
+
+
+def get_exclude_args():
+    return [":(exclude)" + dir for dir in EXCLUDED_DIRS]
+
+
+def check_fileopens():
+    fileopens = list()
+
+    try:
+        fileopens = check_output(["git", "grep", r" open(", "--", "*.py"] + get_exclude_args(), universal_newlines=True, encoding="utf8").splitlines()
+    except CalledProcessError as e:
+        if e.returncode > 1:
+            raise e
+
+    filtered_fileopens = [fileopen for fileopen in fileopens if not re.search(r"encoding=.(ascii|utf8|utf-8).|open\([^,]*, ['\"][^'\"]*b[^'\"]*['\"]", fileopen)]
+
+    return filtered_fileopens
+
+
+def check_checked_outputs():
+    checked_outputs = list()
+
+    try:
+        checked_outputs = check_output(["git", "grep", "check_output(", "--", "*.py"] + get_exclude_args(), universal_newlines=True, encoding="utf8").splitlines()
+    except CalledProcessError as e:
+        if e.returncode > 1:
+            raise e
+
+    filtered_checked_outputs = [checked_output for checked_output in checked_outputs if re.search(r"universal_newlines=True", checked_output) and not re.search(r"encoding=.(ascii|utf8|utf-8).", checked_output)]
+
+    return filtered_checked_outputs
+
+
+def main():
+    exit_code = 0
+
+    nonexplicit_utf8_fileopens = check_fileopens()
+    if nonexplicit_utf8_fileopens:
+        print("Python's open(...) seems to be used to open text files without explicitly specifying encoding='utf8':\n")
+        for fileopen in nonexplicit_utf8_fileopens:
+            print(fileopen)
+        exit_code = 1
+
+    nonexplicit_utf8_checked_outputs = check_checked_outputs()
+    if nonexplicit_utf8_checked_outputs:
+        if nonexplicit_utf8_fileopens:
+            print("\n")
+        print("Python's check_output(...) seems to be used to get program outputs without explicitly specifying encoding='utf8':\n")
+        for checked_output in nonexplicit_utf8_checked_outputs:
+            print(checked_output)
+        exit_code = 1
+
+    sys.exit(exit_code)
+
+
+if __name__ == "__main__":
+    main()