[PATCH v2 0/8] iotests: make meson aware of individual I/O tests

[Daniel P . Berrangé]

To just repeat the patch 5 description...

Currently meson registers a single test that invokes an entire group of
I/O tests, hiding the test granularity from meson. There are various
downsides of doing this

 * You cannot ask 'meson test' to invoke a single I/O test
 * The meson test timeout can't be applied to the individual
   tests
 * Meson only gets a pass/fail for the overall I/O test group
   not individual tests
 * Meson can't show the time of individual I/O tests, so we
   can't see why 4-5 are consuming the bulk of the time
   and ripe for optimization
 * If a CI job gets killed by the GitLab timeout, we don't
   get visibility into how far through the I/O tests
   execution got.

This is not really specific to the I/O tests, the problem is common
to any case of us running a test which is in fact another test
harness which runs many tests. It would be nice to have meson have
the full view of all tests run. Adapting the I/O tests is as easy
win in this respect.

This switches meson to perform test discovery by invoking 'check' in
dry-run mode. It then registers one meson test case for each I/O
test. Parallel execution remains disabled since the I/O tests do not
use self contained execution environments and thus conflict with
each other.

Compare contrast output from a current job:

  https://gitlab.com/qemu-project/qemu/-/jobs/3863603546

[quote]
204/224 qemu:block / qemu-iotests qcow2   OK 329.94s   119 subtests passed
[/quote]

Vs what is seen with this series:

  https://gitlab.com/berrange/qemu/-/jobs/3865975463

[quote]
204/350 qemu:block / qemu-iotests-qcow2-001   OK    2.16s   1 subtests passed
205/350 qemu:block / qemu-iotests-qcow2-002   OK    2.77s   1 subtests passed

...snip...

329/350 qemu:block / qemu-iotests-qcow2-qemu-img-close-errors       OK    6.19s 
  1 subtests passed
330/350 qemu:block / qemu-iotests-qcow2-qsd-jobs          OK    0.55s   1 
subtests passed
[/quote]

A few tweaks were needed to the iotests runner because it had a few
assumptions about it always running in a tree that has already been
built, which is obviously not the case at the time meson does test
discovery.

In v2:

New example pipeline job

   https://gitlab.com/berrange/qemu/-/jobs/3871446106

 * Set build/source dir defaults in CLI option parser
   instead of testenv.py (Alex)
 * Fix messed up termios settings with parallel execution
   by connecting stdin to /dev/null (Thomas)
 * Remove the obsolete check-block.sh script (Thomas)
 * Use a unique sub-directory per test to allow parallelization (Thomas)
 * Enable parallel execution by meson (Thomas)
 * Remove leftover debugging message (Thomas)
 * Use a shorter meson test name 'io-qcow2-012' instead of
   'qemu-iotests-qcow2-012'

Daniel P. Berrangé (8):
  iotests: explicitly pass source/build dir to 'check' command
  iotests: allow test discovery before building
  iotests: strip subdir path when listing tests
  iotests: print TAP protocol version when reporting tests
  iotests: connect stdin to /dev/null when running tests
  iotests: always use a unique sub-directory per test
  iotests: register each I/O test separately with meson
  iotests: remove the check-block.sh script

 tests/check-block.sh             | 43 --------------------------------
 tests/qemu-iotests/check         | 30 +++++++++++++++++++---
 tests/qemu-iotests/meson.build   | 35 +++++++++++++++++++++-----
 tests/qemu-iotests/testenv.py    | 20 +++++++--------
 tests/qemu-iotests/testrunner.py | 43 ++++++++++----------------------
 5 files changed, 78 insertions(+), 93 deletions(-)
 delete mode 100755 tests/check-block.sh

-- 
2.39.2