unicontrol: unbundle the `find-unicode-control` script

[kdudka]

csmock bundles its own copy of the find-unicode-control script. We should remove the script from csmock's git repository and make the unicontrol plug-in download (and cache) the script from upstream as we do in the gitleaks and snyk plug-ins.

[kdudka]

We need to get the following changes upstream first (the first two hunks should be harmless while the change of the output format will need a new option I guess):

--- a/find_unicode_control.py
+++ b/find_unicode_control.py
@@ -15,6 +15,7 @@ from __future__ import print_function

 import sys, os, argparse, re, unicodedata, subprocess
 import importlib
+import six
 from stat import *

 try:
@@ -63,9 +64,9 @@ scan_exclude_mime = [r'text/x-po$', r'text/x-tex$', r'text/x-troff$',
 verbose_mode = False

 # Print to stderr in verbose mode.
-def eprint(*args, **kwargs):
+def eprint(arg, **kwargs):
     if verbose_mode:
-        print(*args, file=sys.stderr, **kwargs)
+        six.print_(arg, file=sys.stderr, **kwargs)

 # Decode a single latin1 line.
 def decodeline(inf):
@@ -103,7 +104,8 @@ def analyze_text_detailed(filename, text, disallowed, msg):
         line = line + 1
         subset = [c for c in t if _chr(ord(c)) in disallowed]
         if subset:
-            print('%s:%d %s: %s' % (filename, line, msg, subset))
+            print('Error: UNICONTROL_WARNING:')
+            print('%s:%d: warning: %s: %s\n' % (filename, line, msg, subset))
             warned = True
     if not warned:
         eprint('%s: OK' % filename)
@@ -118,7 +120,8 @@ def analyze_text(filename, text, disallowed, msg):
         return analyze_text_detailed(filename, text, disallowed, msg)

     if not text.isdisjoint(disallowed):
-        print('%s: %s: %s' % (filename, msg, text & disallowed))
+        print('Error: UNICONTROL_WARNING:')
+        print('%s: warning: %s: %s\n' % (filename, msg, text & disallowed))
         return True
     else:
         eprint('%s: OK' % filename)

[kdudka]

Alternatively, csmock-plugin-unicontrol may postprocess the output of the scanning script, e.g. by sed as we do in the sast-unicode-check task in Konflux: https://github.com/konflux-ci/build-definitions/blob/c2003d906d709799c1383f23f04d755fe4c837be/task/sast-unicode-check/0.1/sast-unicode-check.yaml#L154