[PATCH 00/15] test/functional: improve functional test debugging & fix tuxrun

[Daniel P . Berrangé]

This started out as a series to get rid of the many GBs of temp
files the functional tests leave behind. Then it expanded into
improving the functional test debugging by ensuring we preserve
the QEMU stdout/stderr log file created by the QEMUMachine class.
In the course of doing that I encountered some other minor points
worth fixing, and then got side tracked into looking at the tuxrun
hangs with aarch64be. Investigating the latter exposed some further
holes in the debugging story prompting yet more patches, as well as
a final solution for tuxrun. So this series does:

 * Purge all scratch files created by tests
 * Preserve the stdout/stderr log file
 * Capture debug log messages on QEMUMachine
 * Provide a QMP backdoor for debugging stuck QEMUs
 * Enhance console handling for partial line matches
 * Fix the tuxrun tests by eliminating sleeps

There's quite alot of code here, but at the same time it feels like
the kind of stuff that'll be valuable either in the 9.2 release, or
in the soon to exist 9.2 stable branch.

NB, with this series applied Thomas' tuxrun conversion to functional
testing survives 200 iterations on my machine, whereas it would
reliably hang in < 20, and often in < 10, before.

Daniel P. Berrangé (15):
  tests/functional: fix mips64el test to honour workdir
  tests/functional: automatically clean up scratch files after tests
  tests/functional: remove "AVOCADO" from env variable name
  tests/functional: remove todo wrt avocado.utils.wait_for
  tests/functional: remove leftover :avocado: tags
  tests/functional: remove obsolete reference to avocado bug
  tests/functional: remove comments talking about avocado
  tests/functional: honour self.workdir in ACPI bits tests
  tests/functional: put QEMUMachine logs in testcase log directory
  tests/functional: honour requested test VM name in QEMUMachine
  tests/functional: enable debug logging for QEMUMachine
  tests/functional: logs details of console interaction operations
  tests/functional: rewrite console handling to be bytewise
  tests/functional: remove time.sleep usage from tuxrun tests
  tests/functional: add a QMP backdoor for debugging stalled tests

 docs/devel/testing/functional.rst        | 16 ++++++
 tests/functional/qemu_test/cmd.py        | 65 ++++++++++++++++++------
 tests/functional/qemu_test/testcase.py   | 33 +++++++++---
 tests/functional/qemu_test/tuxruntest.py | 17 +++----
 tests/functional/test_acpi_bits.py       | 56 +++++++-------------
 tests/functional/test_arm_bpim2u.py      | 20 --------
 tests/functional/test_arm_orangepi.py    | 27 ----------
 tests/functional/test_m68k_nextcube.py   |  3 +-
 tests/functional/test_mips64el_malta.py  |  4 +-
 9 files changed, 119 insertions(+), 122 deletions(-)

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2.46.0