De-experiment isolated plugin checkout #2694
Merged
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Description
Isolated plugin checkout was an experiment that ensures each agent worker checks out plugins into a separate directory.
The experiment was made because the previous behavior of sharing the a plugin's directory between agents works was not locking the checkouts correctly.
If two agent workers run two different version of a plugin concurrenlty, the worker that checked out last would control the version of the plugin used by both agent workers.
A solution involving shared and exclusive locks was proposed at the time, but as plugins are usually a small collection of bash scripts, the complexity of the solution was not worth the benefit.
Context
#2301
https://coda.io/d/Escalations-Feedback_dHnUHNps1YO/Escalations_sudOj#Escalations-Table_tuS42/r22&view=modal
Changes
Promote the isolated plugin checkout experiment so that the only behavior is that each work has an independent copy of every plugin.
Testing
go test ./...
). Buildkite employees may check this if the pipeline has run automatically.go fmt ./...
)