configd: T6640: enforce in_session returns False under configd (backport #3955) #3959
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The CStore in_session check is a false positive outside of a config session if a specific environment variable is set with an existing referent in unionfs. To allow extensions when running under configd and avoid confusion, enforce in_session returns False. (cherry picked from commit 6543f44)
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dmbaturin
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c-po
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Change Summary
Injecting the environment variables needed for avoiding the use of my_set under configd (T6633) causes in_session to return True; we should enforce legacy checks to be consistent with the separation of concerns between the config session and conf_mode script execution.
For this (T6489/T6633) and other extensions as we move towards dropping CStore, in_session should return False if running under configd.
The complex of interactions is described in T6639.
Types of changes
Enforce distinction between configd and config session to allow extensions/alternatives to CStore.
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This is an automatic backport of pull request #3955 done by [Mergify](https://mergify.com).