When converting sudo options from a dictionary to a tuple we need
to track the current index into the tuple separately from the
position of the dictionary entry.
Dictionary order is not stable in Python < 3.6 so we need to sort
by key to have consistent results.
The LogHandler output is also different on older Python versions.
Also, don't stop running python tests after the first error.
If "ClassName" is not specified, load the one and only sudo.Plugin from
the module (if so), otherwise display which plugins are available from
which the system admin can choose.
This only happens when sudo unloads the last python plugin.
The reason doing so is because there are some python modules which
does not support importing them again after destroying the interpreter
which has imported them previously.
Another solution would be to just leak the interpreters (let the kernel
free up), but then there might be some python resources like open files
would not get cleaned up correctly if the plugin is badly written.
Tests are meant to test the scenario sudo does, so I have modified them
to generally do not unlink but only a few times (~per plugin type) so it
does not use 48 interpreters (one gets started on every plugin->open) and
it is visible at least which type of plugin fails deinit if there is an
error.
Tests did not catch the issue where errstr was not set correctly, but
its pointer contained the expected data, because the memory allocator
reused the same space for storing the string.
Now it is either verified to be NULL, or reset to NULL.
The main problem was that string array objects were constructed
differently:
- if constructed by the test, then the elements were constant
- if constructed by the plugin, then the elements were allocated
Modified it so that now each array contains allocated strings so
they can be handled similarly. For freeing, I have used the
str_array_free function from the plugin, so I have linked its object
into the test runner.
Happy path is now free of "definitely lost" memleaks, so the test
can be used for valgrind.
Adapted the default sudo_printf from sudoers plugin to be able to print
errors before plugin open() gets called. (This is used by the multiple io
plugin loading to display error for too much plugin load.)
Since this makes us always have a sudo_log, I have removed the logic about
whether it is available or not.
