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fix(mcp): repair sse->http transport mismatch, auto-provision API key

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bambu_mcp_server was refactored from FastMCP/sse to mcp-gate's http|stdio
transport, but native/bambu-run-mcp.service, setup.sh, and bambu-run.sh
enable-mcp were never updated — the systemd unit crash-looped on an
invalid --transport sse flag on any Pi deployed after that change.

Also closes the follow-on gap: MCP over http requires
BAMBU_RUN_MCP_API_KEY, which nothing ever generated, so a fixed service
would just crash-loop on a different error instead. Both setup.sh and
enable-mcp now auto-generate and persist a key (same pattern as
DJANGO_SECRET_KEY), print it in the ready-to-use Claude Desktop config,
and respect a real environment variable over .env if one is already set.
setup.sh's MCP step also gained an idempotency guard so re-running it
doesn't re-prompt/reinstall MCP that's already enabled.

Claude-Session: https://claude.ai/code/session_017Yxt4rdkuSowToxEKGMG9x
This commit is contained in:
RNL
2026-09-05 00:12:23 +10:00
parent 70731c637f
commit 7e4108fb32
3 changed files with 51 additions and 16 deletions
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17
native/bambu-run.sh
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@@ -5,6 +5,7 @@ set -euo pipefail
REPO_DIR="$(cd "$(dirname "$0")/.." && pwd)"
VENV_DIR="$REPO_DIR/.venv"
ENV_FILE="$REPO_DIR/.env"
MANAGE="$VENV_DIR/bin/python $REPO_DIR/standalone/manage.py"
SERVICES="bambu-run-web.service bambu-run-collector.service"
@@ -44,6 +45,19 @@ case "${1:-help}" in
echo "Installing MCP dependencies..."
"$VENV_DIR/bin/pip" install --quiet ".[mcp]"
# Resolution order: a real process/systemd env var always wins and is
# never written to .env; otherwise reuse whatever's already in .env;
# otherwise generate one (same pattern setup.sh uses for DJANGO_SECRET_KEY).
if [ -n "${BAMBU_RUN_MCP_API_KEY:-}" ]; then
echo "Using BAMBU_RUN_MCP_API_KEY from the environment (not written to .env)."
elif grep -q '^BAMBU_RUN_MCP_API_KEY=' "$ENV_FILE" 2>/dev/null; then
echo "BAMBU_RUN_MCP_API_KEY already in .env, reusing it."
else
MCP_API_KEY=$("$VENV_DIR/bin/python" -c "import secrets; print(secrets.token_urlsafe(32))")
echo "BAMBU_RUN_MCP_API_KEY=$MCP_API_KEY" >> "$ENV_FILE"
echo "Generated BAMBU_RUN_MCP_API_KEY and saved it to .env."
fi
sed "s|{{REPO_DIR}}|$REPO_DIR|g; s|{{VENV_DIR}}|$VENV_DIR|g" \
"$REPO_DIR/native/bambu-run-mcp.service" > "$SERVICE_DIR/bambu-run-mcp.service"
@@ -52,10 +66,11 @@ case "${1:-help}" in
systemctl --user start bambu-run-mcp.service
PI_IP=$(hostname -I 2>/dev/null | awk '{print $1}')
MCP_KEY_FOR_DISPLAY="${BAMBU_RUN_MCP_API_KEY:-$(grep '^BAMBU_RUN_MCP_API_KEY=' "$ENV_FILE" 2>/dev/null | cut -d= -f2-)}"
echo "MCP server enabled on port 8808."
echo
echo " Claude Desktop config:"
echo " {\"mcpServers\":{\"bambu-run\":{\"url\":\"http://${PI_IP:-localhost}:8808/sse\"}}}"
echo " {\"mcpServers\":{\"bambu-run\":{\"url\":\"http://${PI_IP:-localhost}:8808/mcp\",\"headers\":{\"Authorization\":\"Bearer ${MCP_KEY_FOR_DISPLAY}\"}}}}"
fi
;;
disable-mcp)