SSHFS: Add helper class to mount filesystem on target through ssh

[nefethael]

Signed-off-by: Vincent Prince vincent.prince.fr@gmail.com

[codecov-io]

Codecov Report

Merging #251 into master will decrease coverage by <.1%.
The diff coverage is 47.8%.

@@           Coverage Diff            @@
##           master    #251     +/-   ##
========================================
- Coverage      55%   54.9%   -0.1%     
========================================
  Files         105     106      +1     
  Lines        6243    6288     +45     
========================================
+ Hits         3437    3458     +21     
- Misses       2806    2830     +24

Impacted Files	Coverage Δ
labgrid/driver/sshdriver.py	48.4% <100%> (ø)	⬆️
labgrid/external/__init__.py	100% <100%> (ø)	⬆️
labgrid/external/sshfs.py	45.4% <45.4%> (ø)

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[kjeldflarup]

Would be nice with an example in the examples section.

A use case could be to combine it with mktemp -d on the DUT, and mount a tmpdir fixture from pytest.

See also https://github.com/labgrid-project/labgrid/issues/250

[nefethael]

@kjeldflarup you're right, i'll add example some day but here how i use it:

in test.py:
sshfs = SSHFS(cmd.target, 'mydir', '/tmp/mymount')

in local.yaml:

....
    - NetworkService:
        address: myhost.local
        username: john
        password: doe
        name: 'mydir'
....
images:
  mydir: '/home/john/doe/mywanteddir'

[Emantor]

Code addtitions look fine, however documentation and an example are missing. Please add those.

[jluebbe]

This should go into https://github.com/labgrid-project/labgridhelper.