100 lines
5.3 KiB
Docker
100 lines
5.3 KiB
Docker
# Felis login-limbo image: LOOHP/Limbo + the felis-limbo readiness plugin.
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#
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# CODE-ONLY in this repo — it is not built by the Go CI. It packages the always-on
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# "login" auth gate the setup provisioner points [velocity] login_image at.
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#
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# LOOHP/Limbo has no official image and no release zip. Its CI
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# (ci.loohpjames.com/job/Limbo) publishes two LOOSE artifacts per build:
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# - target/Limbo-<ver>.jar (the server jar; Main-Class com.loohp.limbo.Limbo)
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# - spawn.schem (the default spawn schematic)
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# There is no bundled server.properties — Limbo writes a default on first run.
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# So the runtime is assembled from those two URLs (not a zip) via --build-arg:
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#
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# docker build -f deploy/limbo/Dockerfile \
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# --build-arg LIMBO_JAR_URL=https://ci.loohpjames.com/job/Limbo/<n>/artifact/target/Limbo-<ver>.jar \
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# --build-arg LIMBO_SCHEM_URL=https://ci.loohpjames.com/job/Limbo/<n>/artifact/spawn.schem \
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# --build-arg LIMBO_VERSION=<maven-api-version> \
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# -t felis-limbo:demo .
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#
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# Note LIMBO_VERSION (the maven API version the plugin compiles against, e.g.
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# 2026.0.2-ALPHA) differs from the jar's CI build-qualified filename (e.g.
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# Limbo-2026.0.2-ALPHA-26.2.jar): the CI qualifier is not published to the maven
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# repo. Then import it the same way as the control-plane image (k3s ctr import)
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# and set [velocity] login_image = "felis-limbo:demo" in felis.toml before setup.
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#
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# Two contracts the operator depends on:
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# 1. The game server listens on 25565 (the CRD's GamePort).
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# 2. The felis-limbo readiness endpoint listens on 8080 (StartupSpec.HealthHTTPPort,
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# overridable via FELIS_HEALTH_PORT) and returns 200 only after the first tick.
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# ---- build the felis-limbo plugin jar ----
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# gradle:*-jdk21 — an official Gradle image on JDK 21. JDK 21 is required because
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# current LOOHP/Limbo releases ship Java 21 API classes (class-file major 65); a
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# JDK 17 fails to read them with "wrong version 65.0, should be 61.0". The image
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# also provides the `gradle` binary (this tree vendors no Gradle wrapper).
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# build.gradle still targets release 17 bytecode so the plugin loads on Java 17+.
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FROM gradle:8.14-jdk21 AS plugin
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WORKDIR /src
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# Copy what the limbo module needs: its own tree plus the shared link core it
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# srcDir-includes (../shared/src/main/java → /src/plugins/shared/src/main/java), so
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# the account-link client + config loader compile straight into the jar.
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COPY plugins/limbo/ ./plugins/limbo/
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COPY plugins/shared/ ./plugins/shared/
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ARG LIMBO_VERSION=+
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RUN cd plugins/limbo \
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&& (test -x ./gradlew && ./gradlew --no-daemon -PlimboVersion="$LIMBO_VERSION" build \
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|| gradle --no-daemon -PlimboVersion="$LIMBO_VERSION" build) \
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&& cp build/libs/*.jar /felis-limbo.jar
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# ---- assemble the runtime ----
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# 21-jre: the Limbo jar is Java 21 bytecode (class-file major 65), so a Java 17
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# JRE cannot run it (UnsupportedClassVersionError). A 21 JRE also runs the
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# plugin's release-17 bytecode fine.
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FROM eclipse-temurin:21-jre
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ARG LIMBO_JAR_URL
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ARG LIMBO_SCHEM_URL
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WORKDIR /limbo
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# Pull the two loose LOOHP/Limbo CI artifacts: the server jar (required, saved as
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# Limbo.jar) and the default spawn schematic (optional). Fail loudly if the jar
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# URL was not supplied.
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RUN set -eu; \
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if [ -z "${LIMBO_JAR_URL:-}" ]; then \
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echo "ERROR: --build-arg LIMBO_JAR_URL=<Limbo server jar> is required" >&2; exit 1; \
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fi; \
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apt-get update && apt-get install -y --no-install-recommends curl ca-certificates; \
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curl -fSL "$LIMBO_JAR_URL" -o /limbo/Limbo.jar; \
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if [ -n "${LIMBO_SCHEM_URL:-}" ]; then \
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curl -fSL "$LIMBO_SCHEM_URL" -o /limbo/spawn.schem; \
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fi; \
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apt-get purge -y curl && apt-get autoremove -y && rm -rf /var/lib/apt/lists/*; \
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mkdir -p /limbo/plugins
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# Drop the login+readiness plugin in beside Limbo.jar.
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COPY --from=plugin /felis-limbo.jar /limbo/plugins/felis-limbo.jar
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# The entrypoint pins the game port AND enables Velocity modern forwarding — refusing to
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# start without the secret, because a login gate that derives offline UUIDs would let
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# anyone claim any Minecraft identity (the Owner's included).
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COPY deploy/limbo/entrypoint.sh /usr/local/bin/felis-entrypoint.sh
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# The operator mounts the world PVC at /data. Runtime state lives there; /limbo
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# remains the immutable image seed copied into the volume by the entrypoint.
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WORKDIR /data
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# Run as the game uid (naming.GameUID in the Go tree). The operator pins the same uid in
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# the pod securityContext whatever USER an image declares; declaring it here as well
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# keeps a plain `docker run` of this image off root, and chowning the empty /data seed
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# lets that run write its world. The jar seed above stays root-owned and read-only to
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# the server.
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RUN chown 1000:1000 /data
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USER 1000:1000
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ENV FELIS_HEALTH_PORT=8080
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# FELIS_GAME_PORT is the port the entrypoint pins Limbo to; it MUST equal the operator's
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# GamePort (internal/operator/builders.go). Default 25565 — override only in lockstep
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# with the operator.
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ENV FELIS_GAME_PORT=25565
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EXPOSE 25565 8080
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# felis-entrypoint.sh pins server-port + velocity-modern/forwarding-secrets, then execs
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# `java -jar Limbo.jar --nogui` from /data (headless: the pod has no console). Limbo writes
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# the rest of server.properties on the persistent volume and loads ./spawn.schem as the
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# spawn world. Invoked via `sh` so no +x bit is needed from the (Windows) build host.
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ENTRYPOINT ["/bin/sh", "/usr/local/bin/felis-entrypoint.sh"]
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