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Fix encoding issue during processing output

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When using the package-installs element there can be some encoding
problems if the package installation emits unparsable output
[1]. However in this case we just want to forward the output to the
console which normally can handle this correctly. In order to fix this
switch off universal_newlines processing such that we just operate on
bytes.

Further we have to decode the lines without setting the locale and
ignoring errors. This is required because print encodes without
setting the locale and thus we need to filter/modify the stream such
that it doesn't crash.

[1] Traceback:
2018-03-01 09:58:00.515 | Traceback (most recent call last):
2018-03-01 09:58:00.515 |   File "/usr/local/bin/package-installs-v2", line 137, in <module>
2018-03-01 09:58:00.515 |     main()
2018-03-01 09:58:00.515 |   File "/usr/local/bin/package-installs-v2", line 130, in main
2018-03-01 09:58:00.515 |     process_output(install_args, follow=True)
2018-03-01 09:58:00.515 |     for line in iter(proc.stdout.readline, ''):
2018-03-01 09:58:00.515 |   File "/usr/lib/python3.5/encodings/ascii.py", line 26, in decode
2018-03-01 09:58:00.515 |     return codecs.ascii_decode(input, self.errors)[0]
2018-03-01 09:58:00.515 | UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 34: ordinal not in range(128)

Change-Id: Ie4af9b4523459a630cfb98d09093bfe9ef7aa61e
This commit is contained in:
Tobias Henkel 2018-03-01 14:04:10 +00:00
parent 3fb0950808
commit b62ed1823c
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GPG Key ID: 03750DEC158E5FA2
1 changed files with 6 additions and 4 deletions
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10
diskimage_builder/elements/package-installs/bin/package-installs-v2
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@ -18,6 +18,7 @@ from __future__ import print_function
import argparse
import json
import locale
import os
import subprocess
import sys
@ -29,19 +30,20 @@ from collections import defaultdict
# if follow is set, output will be echoed to stdout
def process_output(cmdline, follow=False):
proc = subprocess.Popen(cmdline, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True)
stderr=subprocess.STDOUT)
if follow:
print("Running command: %s" % cmdline)
out = ""
with proc.stdout:
for line in iter(proc.stdout.readline, ''):
for line in iter(proc.stdout.readline, b''):
line = line.decode(encoding=locale.getpreferredencoding(False),
errors='backslashreplace')
out += line
print("> %s" % line, end="")
proc.wait()
print("returncode: %d" % proc.returncode)
else:
out = proc.communicate()[0]
out = proc.communicate()[0].decode(errors='backslashreplace')
if proc.returncode:
e = subprocess.CalledProcessError(proc.returncode, cmdline)