Tools: journalctl added

[patriki01]

I added command for journalctl. I included only what I thought are most commonly used parameters. Feel free to suggest change.

[danlavu]

It'd be nice to add a doc entry for this and provide the following examples,

1. Typical usage, getting output from journalctl
2. Assertion usage, how to use it and search for a string in the journal for a test case

assert client.utils.tools.journalctl(grep="search string").rc == 0
assert client.utils.tools.journal(grep="bad string").rc not 0

[patriki01]

I added example usage as you proposed.

[ikerexxe]

I'd also add the --system and --user options, I think I'm using them quite often.

However, this is only an optional improvement so I'm approving this PR.

[patriki01]

I added those options @ikerexxe

[ikerexxe]

Thank you!

[ikerexxe]

@danlavu, @pbrezina do you mind reviewing this PR?

[pbrezina]

Hi, @danlavu can you prepare a list for most common tasks that are used by QE? I'm thinking that it would be good to convert this to standalone class that would provide generic cli call but also methods to handle the most common tasks.

Also it should be possible to work only with messages generated by the test run (either by vacuuming journal during setup or by some other means) and dump journal into a file when a test is finished so we can download it as artifact.

It'll be also good to move this to pytest-mh, since it is not strictly related to sssd/idm.

[danlavu]

@pbrezina ack

@patriki01 I suppose we can take the comment about the assertions out then.

[patriki01]

Okay, I move it there: next-actions/pytest-mh#23