The DCR client registry created its storage directory eagerly in __init__,
and DCR_STORAGE_PATH defaulted to /var/lib/aegis-mcp — a path that is neither
created in the image nor mounted as a writable volume. Under the hardened
read-only docker-compose, every /oauth/authorize, /oauth/token, and /register
call hit `mkdir('/var/lib/aegis-mcp')` on a read-only filesystem, raising an
unhandled OSError and returning a bare "Internal Server Error" during login.
- oauth_flow.py: defer the storage-dir mkdir from __init__ to _persist (the
only write path). authorize/token only read the registry, so they no longer
require a writable filesystem and stop 500-ing.
- docker/Dockerfile: create and chown /var/lib/aegis-mcp.
- docker-compose.yml + docker/docker-compose.yml: add a persistent
aegis-mcp-data volume mounted at /var/lib/aegis-mcp so DCR registrations
survive restarts.
- .env.example: document DCR_STORAGE_PATH and set PUBLIC_BASE_URL to the real
MCP host.
- README.md: spell out exact values (Gitea host, MCP host, callback URL, MCP
URL) and add a "required writable volumes" section explaining the cause of
the login 500.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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