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[tor-bugs] #29789 [Core Tor/Tor]: practracker.py codec exception in some locales

#29789: practracker.py codec exception in some locales
-------------------------------+------------------------------
     Reporter:  catalyst       |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:  Sponsor31-can  |
-------------------------------+------------------------------
 practracker.py, implemented in #29221, seems to have a locale dependency
 when python3 is being used.  If the locale isn't a UTF-8 locale, UTF-8
 characters in sources can result in an exception:

 {{{
 $ LANG=en_US.US-ASCII make check-best-practices PYTHON=python
 python ../scripts/maint/practracker/practracker.py ..
 mirkwood:build-norust tlyu$ LANG=en_US.US-ASCII make check-best-practices
 python3 ../scripts/maint/practracker/practracker.py ..
 Traceback (most recent call last):
   File "../scripts/maint/practracker/practracker.py", line 151, in
 <module>
     main()
   File "../scripts/maint/practracker/practracker.py", line 134, in main
     found_new_issues = consider_all_metrics(files_list)
   File "../scripts/maint/practracker/practracker.py", line 89, in
 consider_all_metrics
     found_new_issues |= consider_metrics_for_file(fname, f)
   File "../scripts/maint/practracker/practracker.py", line 104, in
 consider_metrics_for_file
     found_new_issues |= consider_file_size(fname, f)
   File "../scripts/maint/practracker/practracker.py", line 51, in
 consider_file_size
     file_size = metrics.get_file_len(f)
   File "/Users/tlyu/src/tor/scripts/maint/practracker/metrics.py", line
 11, in get_file_len
     for i, l in enumerate(f):
   File
 "/Users/tlyu/src/brew/Cellar/python/3.7.2_2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/encodings/ascii.py",
 line 26, in decode
     return codecs.ascii_decode(input, self.errors)[0]
 UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 14:
 ordinal not in range(128)
 make: *** [check-best-practices] Error 1
 }}}

 I'm also seeing this on gitlab.com CI, but I don't know offhand what its
 locale environment variables are.

 We might want to use the `encoding=` keyword parameter to `open()`, but I
 think that would no longer be python2 compatible.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29789>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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