Certain tests like testAP spawn two IWD process in separate
namespaces. When --valrind is used this eats up quite a bit
of RAM and causes the VM to run out of memory and start
killing off processes.
Since using --valgrind actually runs IWD using the valgrind
process the --verbose flag would only work if 'valgrind' was
also specified. This was taken into account with is_verbose
but the actual logic enabling stdout did not use that helper.
This was due, in part, to logging since is_verbose will always
return true if --log is used. To fix this a new flag was added
to is_verbose which omits the --log check to handle this
specific case.
There was a bug with process output where the last bit of data would
never make it into stdout or log files. This was due to the IO watch
being cleaned up when the process was killed and never allowing it
to finish writing any pending data.
Now the IO watch implementation has been moved out into its own
function (io_process) which is now used to write the final bits of
data out on process exit.
The processes in the list ultimately get removed for each
kill() call. This causes strange behavior since the list is
being iterated and each iteration is removing items. Instead
iterate over a new temporary list so the actual process list
can be cleaned up.
IWD_GENL_DEBUG is not generally useful anymore as it just prints a
hexdump of the raw data on the socket. The messages are quite verbose
and spam test-runner logs for little utility.
Process output was being duplicated when -v was used. This was
due to both stderr and stdout being appended to the write_fd list
as well as stderr being set to stdout in the Popen call.
To fix this only stdout should be appended to the write_fd list,
but then there comes a problem with closing the streams. stdout
cannot be closed, so instead it is special cased. A new
verbose boolean was added to Process which, if True, will
cause any output to be written to stdout explicitly.
The Namespace class was never being removed when tests finished.
This is fixed by unreffing the hwsim internal _radio object which
both cleans up the radio and allows the Namespace to be removed.
This moves all the de-init code into kill(), which fixes a few
reference issues causing processes to hang around longer than
desired. If the process terminates on its own and/or the last
reference is lost __del__ will kill the process and clean up.
There were a few issues with the cleanup of Hostapd. First the
process was only being killed, which did not actually remove
the process from the list.
In addition, with EAP-SIM/AKA tests, hostapd created sim_db
unix socket files which it does not clean up.
This is somewhat of an open issue/TODO but for now this avoids
the exception caused by trying to remove a radio that has been
moved to a namespace. Once a radio is moved hwsim loses that phy
and can no longer interact with it. This causes the Destroy()
method call to fail.
A cleanup parameter was added to __init__ which can be used
by processes which create any additional files or require more
a custom cleanup routine. Some additional house keeping was
done to make Process cleanup more robust.
Though multi-test processes seemed like a good idea in terms of
efficiency, the additional code/special cases was not worth it
for the only two multi-test processes (dbus/haveged). Intead this
concept was removed completely and TestContext/Namespaces will
now start all processes for each individual test. This also is
fair to all tests as a previous failed test could end up bleeding
into future tests.
Printing out processes was done manually but instead we can
make Process printing extendable by adding its own __str__
method. This now will print if the process is a multi-test
process as well.
Output files in namespaces were not handled differently and would
end up overwriting/duplicating files from the root namespace. These
are now named /tmp/<process>-<namespace>-out.
The process class was quite hard to understand, and somewhat
fragile when multiple output options were needed like verbose
and logging, and in some cases even an additional output file.
To make things simpler we can have all processes output to a
temporary file (/tmp/<name>-out) and set a GLib IO watch on
that file. When the IO watch callback fires any additional
files (stdout, log files, output files) can be written to.
For wait=True processes we do not use an IO watch, but do
the same thing once the process exits, write to any additional
output files using the process output we already have.
The log dir was never being cleaned out prior to a new logging
test run. This could leave old stale files around. Note that this
will remove any past log files so if you need them, you want to
make a copy before running test-runner with --log again.
Dbus should be started as a multi-test process from the
TestContext, which leaves the dbus address file around for
the full test run. For Namespaces dbus-daemon should be
closed when the Namespace closes.
There were some major problems related to logging and process
output. Tests which required output from start_process would
break if used with '--log/--verbose'. This is because we relied
on 'communicate' to retrieve the process output, but Popen does
not store process output when stdout/stderr are anything other
than PIPE.
Intead, in the case of logging or outfiles, we can simply read
from the file we just wrote to.
For an explicit --verbose application we must handle things
slightly different. A keyword argument was added to Process,
'need_out' which will ensure the process output is kept
regardless of --log or --verbose.
Now a user should be able to use --log/--verbose without any
tests failing.
The verbose arguments come in from the QEMU command line as a
single string. This should have been split into an array immediately
but was not. This led to issues like hostapd debug being enabled
when "-v hostapd_cli" was passed in.
Since the list of files copied to /tmp was part of the return value from
pre_test(), if an exception occurred inside pre_test(), "copied" would
be undefined and the post_test(ctx, copied) call in the finally clause
cause another exception:
raceback (most recent call last):
File "/home/balrog/repos/iwd/tools/test-runner", line 1508, in <module>
run_tests()
File "/home/balrog/repos/iwd/tools/test-runner", line 1242, in run_tests
run_auto_tests(config.ctx, args)
File "/home/balrog/repos/iwd/tools/test-runner", line 1166, in run_auto_tests
post_test(ctx, copied)
UnboundLocalError: local variable 'copied' referenced before assignment
(apart from not being able to clean up the files). Pass "copied" as a
paremeter to pre_test instead.
Use the hwsim DBus API rather than command line. This both is
faster and more dynamic than doing so with the command line.
This also avoids tracking the radio ID since we can just hang
on to the radio Dbus object directly.
The Create() API was limited to only taking a Name and boolean
(for p2p enabling). The actual hwsim nl80211 API can take more
attributes than this (which are actually utilized when creating
from the command line). To get the DBus API up to the same
functionality the two arguments in Create were replaced with
a single dictionary. This allows for extending later if more
arguments are needed.
In the NEW_RADIO callback hwsim was assuming that DBus had no
yet replied to the Create() method. In some cases the NEW_RADIO
event fires before the actual callback which will respond to
DBus. This causes a crash in the create callback.
Starts hwsim but does not register to mac80211_hwsim. This is to
allow autotests to disable hwsim, while still having the ability
to create/destroy radios over DBus.
For better reliability the processor count is now set to qemu.
In cases of low CPU count (< 2) hosts the processor count is
limited to 1. Otherwise half of the host cores will be used for
the VM.
Allow the storage directory (default /tmp/iwd) to be configured
just like the state directory. This is in order to support multiple
IWD instances which require separate storage directories for network
provisioning files.
Our simulated environment was really only meant to test air-to-air
communication by using mac80211_hwsim. Protocols like DHCP use IP
communication which starts to fall apart when using hwsim radios.
Mainly unicast sockets do not work since there is no underlying
network infrastructure.
In order to simulate a more realistic environment network namespaces
are introduced in this patch. This allows wireless phy's to be added
to a network namespace and unique IWD instances manage those phys.
This is done automatically when 'NameSpaces' entries are configured
in hw.conf:
[SETUP]
num_radios=2
[NameSpaces]
ns0=rad1,...
This will create a namespace named ns0, and add rad1 to that
namespace. rad1 will not appear as a phy in what's being called the
'root' namespace (the default namespace).
As far as a test is concerned you can create a new IWD() class and
pass the namespace in. This will start a new IWD instance in that
namespace:
ns0 = ctx.get_namespace('ns0')
wd_ns0 = IWD(start_iwd=True, namespace=ns0)
'wd_ns0' can now be used to interact with IWD in that namespace, just
like any other IWD class object.
Sometimes improperly written tests can end up causing future tests
to fail. For faster debugging you can now add a '+' after a given
autotest which will start that test and run all tests which come
alphabetically after it (as if you are running a full autotest suite).
Example:
./test-runner -A testWPA+
This will run testWPA, testWPA2, testWPA2-no-CCMP, testWPA2-SHA256,
and testWPA2withMFP.
This can result in strange test results since there was no less
than zero checks before subtracting the total tests from failed
tests. In case of an internal exception we can just set all values
to zero. This will be handled specially as we do for timeout
errors.
