docker-golang

Docker Hub Link: vcabbage/golang

This Dockerfile builds a container with the Go toolchain from the master branch of the Go repository.

Download the prebuilt container from Docker Hub:

docker pull vcabbage/golang

The build pulls the Go repo, compiles it with the latest released version, then replaces the release version with the newly compiled toolchain. As the image is based on the official golang:latest image, documentation in Docker Hub golang repository applies to this image as well.

Building a Specific Branch or Commit

A specific branch or commit can be built by passing in the checkout build arg.

$ docker build --build-arg checkout=dev.ssa .
Sending build context to Docker daemon 133.6 kB
Step 1 : FROM golang:latest
 ---> 002b233310bb
Step 2 : ARG checkout=master
 ---> Using cache
 ---> 2a53f12a1b34
Step 3 : RUN git clone https://go.googlesource.com/go /tmp/go &&     cd /tmp/go/src &&     git checkout $branch &&     GOROOT_BOOTSTRAP=/usr/local/go GOROOT_FINAL=/usr/local/go ./make.bash &&     cd - &&     rm -rf /usr/local/go &&     rm -rf /tmp/go/.git* &&     mv /tmp/go /usr/local/go
 ---> Running in f7d38341caf7
Cloning into '/tmp/go'...
Switched to a new branch 'dev.ssa'
Branch dev.ssa set up to track remote branch dev.ssa from origin.
##### Building Go bootstrap tool.
cmd/dist

##### Building Go toolchain using /usr/local/go.
[omitted]

 ---> aee3a3e6c1d6
Removing intermediate container f7d38341caf7
Successfully built aee3a3e6c1d6

$ docker run --rm aee3a3e6c1d6 go version
go version devel +d08010f Mon Aug 15 14:47:49 2016 +0000 linux/amd64

Docker Hub Images

The Docker Hub images are automatically built when new commits are added to the Go repository, typically within 30 minutes. Each image is tagged with the commit ID as seen in the output of go version.

In order to keep the images to a reasonable size, docker-squash is used to merge the image layers. This removes roughly 130MB from the final image.

For details on the build process, see circle.yml.