Issue #93: Dockerfile and instructions for reproducing binaries

.gitignore

@@ -27,7 +27,7 @@ _testmain.go
 *.prof
 
 # build folder
-build
+/build
 
 # IDE settings
 .idea

README.md

@@ -129,6 +129,23 @@ func main() {
 }
 ```
 
+## Reproducing binaries
+
+Versions >= 1.4.16 can be checked for reproducibility. There is a ready-to-go [Dockerfile](docker/build/Dockerfile)
+which prepares an appropriate environment given several docker build-args
+```bash
+docker build -t fritzctl/build docker/build \
+   --build-arg go_version=1.9.2 \
+   --build-arg fritzctl_version=1.4.16 \
+   --build-arg fritzctl_revision=v1.4.16
+```
+Building the binaries is done in the container phase:
+```bash
+docker run --rm -v fritzctl_build_folder:/root/go/src/github.com/bpicode/fritzctl/build fritzctl/build
+```
+The above command will create a docker volume `fritzctl_build_folder` containing the binaries. Those can be checked for
+equality with the distributed ones.
+
 ## License
 
 This project is licensed under the terms of the MIT license, see [LICENSE](https://github.com/bpicode/fritzctl/blob/master/LICENSE).

docker/build/Dockerfile

@@ -0,0 +1,24 @@
+FROM ubuntu:xenial
+
+ARG go_version=1.9.2
+ARG fritzctl_revision=master
+ARG fritzctl_version=unknown
+
+RUN apt-get update && apt-get install -y make wget git
+RUN wget --quiet https://storage.googleapis.com/golang/go${go_version}.linux-amd64.tar.gz
+RUN tar -xf go${go_version}.linux-amd64.tar.gz
+RUN mv go /usr/local
+RUN mkdir -p /root/go/src/github.com/bpicode
+
+WORKDIR /root/go/src/github.com/bpicode
+RUN git clone https://github.com/bpicode/fritzctl.git
+WORKDIR /root/go/src/github.com/bpicode/fritzctl
+RUN git checkout ${fritzctl_revision}
+RUN mkdir build
+
+ENV GOPATH=/root/go
+ENV GOROOT=/usr/local/go
+ENV PATH=$GOPATH/bin:$GOROOT/bin:$PATH
+ENV FRITZCTL_VERSION=$fritzctl_version
+
+ENTRYPOINT [ "make", "sysinfo", "deps", "dist_all"]