dev: Fix cache directory permissions for nonroot user#131
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The distroless runtime image runs as `nonroot`, but `/tmp/synapse-cache` doesn't exist in the image — so when devservices mounts a named volume there, Docker creates the mountpoint as root and the locator's filesystem backup store fails to write. Pre-create the directory in the builder stage and COPY it into the runtime image with `--chown=nonroot:nonroot`, so named volumes inherit nonroot ownership. Since the path is now baked into the image, make `base_dir` optional in the locator config (defaulting to `/tmp/synapse-cache`) and drop the explicit setting from the devservices YAMLs.
markstory
approved these changes
May 19, 2026
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The distroless runtime image runs as
nonroot, but/tmp/synapse-cachedoesn't exist in the image — so when devservices mounts a named volume there, Docker creates the mountpoint as root and the locator's filesystem backup store fails to write.Pre-create the directory in the builder stage and COPY it into the runtime image with
--chown=nonroot:nonroot, so named volumes inherit nonroot ownership.Since the path is now baked into the image, make
base_diroptional in the locator config (defaulting to/tmp/synapse-cache) and drop the explicit setting from the devservices YAMLs.