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feat(multiplayer): add game-server Docker image with the supervisor as PID 1

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New additive targets, the existing server/exporter/smoke-client/enet-test
targets are byte-for-byte unchanged (make verify-phase6 re-run clean
after this, see previous commit):

  - supervisor-build: builds server/cmd/game-server-supervisor with a
    pinned golang:1.23-alpine (matching go.mod's go 1.23)
  - game-server: the same dedicated-server export as `server`, plus the
    supervisor binary, with the supervisor as ENTRYPOINT instead of the
    direct launcher script -- this is what makes the process-ready/
    assignment-ready control-plane registration from the last two
    commits actually reachable in a real deployment.

Verified with a real docker build --target game-server, not just by
reading the file: both binaries land at the expected paths with
correct permissions, and the supervisor prints its usage text when
run directly.

deploy/k8s/base/fleet.yaml does not reference this image or invoke the
supervisor's flags yet -- documented inline and in
multiplayer-next.md; that's the next concrete step, not attempted here
since the exact flag values (control-plane URL, workload-token mount
path) are deployment-environment decisions this sandbox can't make.
This commit is contained in:
Josh Creek
2026-09-01 13:38:19 +01:00
parent 9b26f867bc
commit 14e1e62deb
1 changed files with 24 additions and 0 deletions
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Dockerfile
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@@ -47,3 +47,27 @@ ENTRYPOINT ["/opt/cosmic-clash/cosmic-clash-server"]
FROM exporter AS smoke-client
WORKDIR /workspace
ENTRYPOINT ["godot", "--headless", "--path", "Game", "res://tests/export_server_smoke.tscn", "--"]
# Builds the process supervisor (server/supervisor, multiplayer-next.md task
# 8.27/8.28) that wraps the Agones-allocated dedicated server as PID 1.
# golang:1.23-alpine (matches server/go.mod's `go 1.23`), resolved 2026-09-01.
FROM --platform=linux/amd64 golang@sha256:383395b794dffa5b53012a212365d40c8e37109a626ca30d6151c8348d380b5f AS supervisor-build
WORKDIR /workspace/server
COPY server/go.mod server/go.sum ./
RUN go mod download
COPY server/ ./
RUN CGO_ENABLED=0 go build -o /opt/cosmic-clash/game-server-supervisor ./cmd/game-server-supervisor
# Agones-allocated fleet image: the same dedicated-server export as `server`
# (unchanged above; make verify-phase6 exercises that target exactly as
# before), wrapped by the Go supervisor as PID 1 instead of the direct
# launcher script -- required for process-ready/assignment-ready Agones SDK
# calls and control-plane registration (multiplayer-next.md §8.27/§8.28).
# deploy/k8s/base/fleet.yaml does not reference this target yet: the
# per-deployment supervisor flags (--sdk-base-url, --control-plane-url,
# --workload-token-path, ...) still need to be decided and added to the
# Fleet pod template, along with the projected workload-token volume.
FROM server AS game-server
COPY --from=supervisor-build /opt/cosmic-clash/game-server-supervisor /opt/cosmic-clash/game-server-supervisor
RUN chmod 0755 /opt/cosmic-clash/game-server-supervisor
ENTRYPOINT ["/opt/cosmic-clash/game-server-supervisor"]