Don't surface expected stderr output from git rev-parse #3095
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Description
When using git-mirrors, a rev-parse call is made to look for the commit within the current mirror, which will fatal if not found. As this is expected behaviour, capturing and displaying this error is misleading and not helpful. We can instead ignore it, as the mirror will be updated in this circumstance.
Context
https://coda.io/d/Escalations-Feedback_dHnUHNps1YO/Pipelines-In-Progress-Board_suIFKYEb#Escalations-Pipelines_tuQbCBf6/r850&view=modal
Changes
When doing the rev-parse check for the commit, include a
ShowStderr(false)
to the shell call.Testing
go test ./...
). Buildkite employees may check this if the pipeline has run automatically.go fmt ./...
)