agentwrapper: Allow specifying agent prefix

[benjamin1313]

Allows client to specify where on the exporter .labgrid_agent_{agent_hash}.py should be copied to. Default is the user homedir.

Description

Checklist

• Documentation for the feature
• Tests for the feature

• PR has been tested

• Man pages have been regenerated

[Emantor]

Can you elaborate a bit more on why you need this? Uploading these files to other directories than the users home directory could mean that they can be modified by a different user and this may provide a security risk.

[benjamin1313]

Can you elaborate a bit more on why you need this? Uploading these files to other directories than the users home directory could mean that they can be modified by a different user and this may provide a security risk.

We are running the labgrid exporter as a systemd portable service. The homedir for the exporter user is read-only (this is on purpose). We have tmpfs dirs available for the service we use for this purpose. They are local to the portable service, so not available to other users.
With a agent prefix we get more control over where the agent is saved allowing us to place it in a tmpfs dir instead of the homedir.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.8%. Comparing base (cea524d) to head (a1141a3).
⚠️ Report is 167 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1584   +/-   ##
======================================
  Coverage    55.8%   55.8%           
======================================
  Files         170     170           
  Lines       13377   13378    +1     
======================================
+ Hits         7469    7470    +1     
  Misses       5908    5908           

Flag	Coverage Δ
3.10	56.1% <100.0%> (+<0.1%)	⬆️
3.11	?
3.12	56.1% <100.0%> (+<0.1%)	⬆️
3.13	56.1% <100.0%> (+<0.1%)	⬆️
3.9	56.1% <100.0%> (+<0.1%)	⬆️

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