cascache.py: Raise ArtifactError on grpc error (!576) · Merge requests · BuildStream / buildstream · GitLab

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Description

Avoid unhandled RpcError by raising an ArtifactError instead.

Changes proposed in this merge request:

Raise an ArtifactError instead of re-raising an RpcError

This merge request, when approved, will close issue/bug: #502 (closed)