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Motivation¶

Variables ending up in vars.json can come from job settings (database), worker settings and set_var() calls.
Sometimes it's hard to trace where a variable was set.
It would at least be nice to see if a variable was in vars.json at the beginning, or if it was set during the test.

Suggestions¶

• Since %bmwqemu::vars is a tied hash, we can actually trace every change and find out the call stack
• Log every call to set_var() with diag() (possibly depending on a job setting DEBUG_VARS
• Save and upload the original vars.jsonseperately
• Add the trace and timestamp for every set_var() call to the object and output that at the end via diag or upload it
• Proof of Concept: https://github.com/os-autoinst/os-autoinst/pull/2468