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support/testing: don't fail on tests emitting invalid utf-8 sequences

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When booting under EFI, grub2 will output a nice and shiny boot menu,
using extended ASCII characters (in the [0x80..0xFF] range), namely
CP437 [0], on the assumption that the VGA BIOS is a real one and has the
corresponding (and only!) font, as is the case on real hardware.

However, when run in our runtime test infrastructure, this triggers the
infamous python UnicodeDecodeError exception:

    Traceback (most recent call last):
      [...]
        emulator.login()
      File "[...]/buildroot/support/testing/infra/emulator.py", line 89, in login
        index = self.qemu.expect(["buildroot login:", pexpect.TIMEOUT],
      File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 340, in expect
        return self.expect_list(compiled_pattern_list,
      File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 369, in expect_list
        return exp.expect_loop(timeout)
      File "/usr/lib/python3/dist-packages/pexpect/expect.py", line 111, in expect_loop
        incoming = spawn.read_nonblocking(spawn.maxread, timeout)
      File "/usr/lib/python3/dist-packages/pexpect/pty_spawn.py", line 485, in read_nonblocking
        return super(spawn, self).read_nonblocking(size)
      File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 178, in read_nonblocking
        s = self._decoder.decode(s, final=False)
      File "/usr/lib/python3.8/codecs.py", line 322, in decode
        (result, consumed) = self._buffer_decode(data, self.errors, final)
    UnicodeDecodeError: 'utf-8' codec can't decode byte 0xda in position 0: invalid continuation byte

Grub2 is not wrong in emitting those chars, and basically we should not
expect the packages we test to always emit correct UTF-8 sequences; at
the very least, this should not cause the test infra to fail.

We fix that by telling pexpect.spawn to "fix" such invalid sequences by
replacing them with the suitable Unicode character, U+FFFD REPLACEMENT
CHARACTER.

[0] https://en.wikipedia.org/wiki/Code_page_437
[1] https://docs.python.org/3/library/codecs.html#error-handlers

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
[yann.morin.1998@free.fr:
  - don't change encoding, use codec_errors
  - rewrite commit log accordingly
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Kory Maincent 2021-09-23 17:57:24 +02:00 committed by Yann E. MORIN
parent 1702e06a77
commit d6d7cbb8e0
1 changed files with 1 additions and 0 deletions
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1
support/testing/infra/emulator.py
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@ -77,6 +77,7 @@ class Emulator(object):
self.qemu = pexpect.spawn(qemu_cmd[0], qemu_cmd[1:],
timeout=5 * self.timeout_multiplier,
encoding='utf-8',
codec_errors='replace',
env={"QEMU_AUDIO_DRV": "none"})
# We want only stdout into the log to avoid double echo
self.qemu.logfile_read = self.logfile