Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- Fix crash on write to read-only devices
- iotests: Rewrite 'check' in Python, get rid of 'groups'

Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- Fix crash on write to read-only devices
- iotests: Rewrite 'check' in Python, get rid of 'groups' and allow
non-numeric test case names

# gpg: Signature made Wed 27 Jan 2021 19:56:00 GMT
# gpg: using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg: issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
iotests: rename and move 169 and 199 tests
iotests: rewrite check into python
iotests: add testrunner.py
iotests: add testenv.py
iotests: add findtests.py
iotests: 146: drop extra whitespaces from .out file
virtio-scsi-test: Test writing to scsi-cd device
block: Separate blk_is_writable() and blk_supports_write_perm()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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iotests: add findtests.py

Add python script with new logic of searching for tests:

Current ./check behavior:
- tests are named [0-9][0-9][0-9]
- tests must be registered in group file (even if te

iotests: add findtests.py

Add python script with new logic of searching for tests:

Current ./check behavior:
- tests are named [0-9][0-9][0-9]
- tests must be registered in group file (even if test doesn't belong
to any group, like 142)

Behavior of findtests.py:
- group file is dropped
- tests are all files in tests/ subdirectory (except for .out files),
so it's not needed more to "register the test", just create it with
appropriate name in tests/ subdirectory. Old names like
[0-9][0-9][0-9] (in root iotests directory) are supported too, but
not recommended for new tests
- groups are parsed from '# group: ' line inside test files
- optional file group.local may be used to define some additional
groups for downstreams
- 'disabled' group is used to temporary disable tests. So instead of
commenting tests in old 'group' file you now can add them to
disabled group with help of 'group.local' file
- selecting test ranges like 5-15 are not supported more
(to support restarting failed ./check command from the middle of the
process, new argument is added: --start-from)

Benefits:
- no rebase conflicts in group file on patch porting from branch to
branch
- no conflicts in upstream, when different series want to occupy same
test number
- meaningful names for test files
For example, with digital number, when some person wants to add some
test about block-stream, he most probably will just create a new
test. But if there would be test-block-stream test already, he will
at first look at it and may be just add a test-case into it.
And anyway meaningful names are better.

This commit doesn't update check behavior (which will be done in
further commit), still, the documentation changed like new behavior is
already here. Let's live with this small inconsistency for the
following few commits, until final change.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210125185056.129513-3-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

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