Improve the Docker image

.dockerfiles/entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+[ -n "${PUID}" ] && usermod -u "${PUID}" msgbus
+[ -n "${PGID}" ] && groupmod -g "${PGID}" msgbus
+
+printf "Switching UID=%s and GID=%s\n" "${PUID}" "${PGID}"
+exec su-exec msgbus:msgbus "$@"

.dockerignore

@@ -1,2 +1,14 @@
+Dockerfile
+
 *~
 *.bak
+.DS_Store
+*.idea
+
+/dist
+
+/msgbus
+/msgbusd
+
+/cmd/msgbus/msgbus
+/cmd/msgbusd/msgbusd

Dockerfile

@@ -1,35 +1,65 @@
 # Build
 FROM golang:alpine AS build
 
-ARG TAG
-ARG BUILD
+RUN apk add --no-cache -U build-base git make
 
-ENV LIBRARY msgbus
-ENV SERVER msgbusd
-ENV CLIENT msgbus
-ENV REPO prologic/$LIBRARY
+RUN mkdir -p /src
 
-RUN apk add --update git make build-base && \
-    rm -rf /var/cache/apk/*
+WORKDIR /src
 
-WORKDIR /go/src/github.com/$REPO
-COPY . /go/src/github.com/$REPO
-RUN make TAG=$TAG BUILD=$BUILD build
+# Copy Makefile
+COPY Makefile ./
+
+# Install deps
+RUN make deps
+
+# Copy go.mod and go.sum and install and cache dependencies
+COPY go.mod .
+COPY go.sum .
+
+# Copy sources
+COPY *.go ./
+COPY ./client/*.go ./client/
+COPY ./cmd/msgbusd/*.go ./cmd/msgbusd/
+COPY ./cmd/msgbus/*.go ./cmd/msgbus/
+
+# Version/Commit (there there is no .git in Docker build context)
+# NOTE: This is fairly low down in the Dockerfile instructions so
+#       we don't break the Docker build cache just be changing
+#       unrelated files that actually haven't changed but caused the
+#       COMMIT value to change.
+ARG VERSION="0.0.0"
+ARG COMMIT="HEAD"
+
+# Build client binary
+RUN make cli VERSION=$VERSION COMMIT=$COMMIT
+
+# Build server binary
+RUN make server VERSION=$VERSION COMMIT=$COMMIT
 
 # Runtime
-FROM scratch
+FROM alpine:latest
 
-ENV LIBRARY msgbus
-ENV SERVER msgbusd
-ENV CLIENT msgbus
-ENV REPO prologic/$LIBRARY
+RUN apk --no-cache -U add su-exec shadow ca-certificates tzdata
 
-LABEL msgbud.app main
+ENV PUID=1000
+ENV PGID=1000
 
-COPY --from=build /go/src/github.com/${REPO}/cmd/${SERVER}/${SERVER} /${SERVER}
-COPY --from=build /go/src/github.com/${REPO}/cmd/${CLIENT}/${CLIENT} /${CLIENT}
+RUN addgroup -g "${PGID}" msgbus && \
+    adduser -D -H -G msgbus -h /var/empty -u "${PUID}" msgbus && \
+    mkdir -p /data && chown -R msgbus:msgbus /data
 
-EXPOSE 8000/tcp
+VOLUME /data
 
-ENTRYPOINT ["/msgbusd"]
-CMD []
+WORKDIR /
+
+# force cgo resolver
+ENV GODEBUG=netdns=cgo
+
+COPY --from=build /src/msgbusd /usr/local/bin/msgbusd
+COPY --from=build /src/msgbus /usr/local/bin/msgbus
+
+COPY .dockerfiles/entrypoint.sh /init
+
+ENTRYPOINT ["/init"]
+CMD ["msgbusd"]