Fix docker builds for musl

CHANGELOG.md

+# v0.2.1 (2018-08-11)
+
+Use musl builds for alpine images.
+
 # v0.2.0 (2018-08-10)
 
 * Corrected 'on' value for lights

Dockerfile.amd64

-FROM        amd64/busybox:musl
+FROM        alpine:latest
 MAINTAINER  Richard Mitchell <hue-exporter@mitch.org.uk>
 
-COPY ./build/hue_exporter.amd64 /bin/hue_exporter
+COPY ./build/hue_exporter.amd64.musl /bin/hue_exporter
 COPY hue_exporter.example.yml   /etc/hue_exporter/config.yml
 
-VOLUME /etc/hue_exporter
-
 EXPOSE      9366
 ENTRYPOINT  [ "/bin/hue_exporter" ]
 CMD         [ "--config.file=/etc/hue_exporter/config.yml" ]

Dockerfile.arm7

-FROM        arm32v7/busybox:latest
+FROM        armhf/alpine:latest
 MAINTAINER  Richard Mitchell <hue-exporter@mitch.org.uk>
 
-COPY ./build/hue_exporter.arm7 /bin/hue_exporter
+COPY ./build/hue_exporter.arm7.musl /bin/hue_exporter
 COPY hue_exporter.example.yml   /etc/hue_exporter/config.yml
 
-VOLUME /etc/hue_exporter
-
 EXPOSE      9366
 ENTRYPOINT  [ "/bin/hue_exporter" ]
 CMD         [ "--config.file=/etc/hue_exporter/config.yml" ]

Dockerfile.build.amd64.musl

+FROM amd64/golang:alpine
+
+COPY . /go/src/github.com/mitchellrj/hue_exporter
+WORKDIR /go/src/github.com/mitchellrj/hue_exporter
+
+VOLUME /build
+CMD go build -o /build/hue_exporter.amd64.musl

Dockerfile.build.arm7.musl

+FROM armhf/alpine:latest
+
+RUN apk add --no-cache git go musl-dev && mkdir /go
+ENV GOPATH=/go
+COPY . /go/src/github.com/mitchellrj/hue_exporter
+WORKDIR /go/src/github.com/mitchellrj/hue_exporter
+
+VOLUME /build
+CMD go build -o /build/hue_exporter.arm7.musl

Makefile

@@ -18,19 +18,27 @@ staticcheck:
 build:
 	go build
 
-dist: darwin amd64 arm7 docker
+dist: darwin amd64 arm7 amd64-musl arm7-musl docker
 
 darwin:
 	cp hue_exporter build/hue_exporter.darwin
 
 amd64:
-	docker build --pull -f Dockerfile.build.amd64 -t hue_exporter_builder:latest .
+	docker build --pull -f Dockerfile.build.amd64.glibc -t hue_exporter_builder:latest .
 	docker run -v $$(pwd)/build:/build hue_exporter_builder:latest
 
 arm7:
-	docker build --pull -f Dockerfile.build.arm7 -t hue_exporter_builder:latest-arm .
+	docker build --pull -f Dockerfile.build.arm7.glibc -t hue_exporter_builder:latest-arm .
 	docker run -v $$(pwd)/build:/build hue_exporter_builder:latest-arm
 
+amd64-musl:
+	docker build --pull -f Dockerfile.build.amd64.musl -t hue_exporter_builder:latest-musl .
+	docker run -v $$(pwd)/build:/build hue_exporter_builder:latest-musl
+
+arm7-musl:
+	docker build --pull -f Dockerfile.build.arm7.musl -t hue_exporter_builder:latest-arm-musl .
+	docker run -v $$(pwd)/build:/build hue_exporter_builder:latest-arm-musl
+
 docker:
 	docker build --pull -f Dockerfile.amd64 -t mitchellrj/hue_exporter:latest .
 	docker tag mitchellrj/hue_exporter:latest mitchellrj/hue_exporter:$$(build/hue_exporter.darwin -V)

README.md

@@ -73,6 +73,10 @@ Those flag values are the defaults, so you could just run `hue_exporter` on its
 
 There are a few docker images built, including ones for ARM7 (Raspberry Pi). You can find these on [Docker Hub](https://hub.docker.com/r/mitchellrj/hue_exporter). They expose `/etc/hue_exporter` as a volume for you to generate or pass in your own configuration.
 
+```
+docker run -p 9366:9366 -v my_config.yml:/etc/hue_exporter/config.yml mitchellrj/hue_exporter:latest
+```
+
 ## License
 
 MIT / X11 Consortium license. I'd prefer to use Apache 2.0, but the excellent Hue library that this app uses is GPL 2.0 and that isn't compatible with Apache.

version.go

 package main
 
-const VERSION = "0.2.0"
+const VERSION = "0.2.1"