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golang-armbuilds

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Pre-compiled GOLANG tarballs for ARM devices.

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# golang-armbuilds
Pre-compiled GOLANG tarballs for ARM devices.

In this repo we'd like to document all steps how to compile the GOLANG compiler from source and package
the results as pre-compiled tarballs. So everyone can easily reproduce these steps on a bare ARM Linux machine
without the need of having Go already installed. You can use this informations to compile Go on all different
CPU architectures as well.

To make a developers live even easier, we're providing in the [release section](https://github.com/hypriot/golang-armbuilds/releases)
all pre-compiled Go tarballs for all supported ARM versions:
- ARMv5
- ARMv6 (Raspberry Pi A, A+, B, B+, Zero)
- ARMv7 (Raspberry Pi 2, 3, Scaleway C1)
- ARM64 (which is also known as AARCH64)

## How to install and use a pre-compiled GOLANG tarball
Just download the correct tarball for your ARM CPU from the [release section](https://github.com/hypriot/golang-armbuilds/releases)
and install it to `/usr/local/go`, set the `PATH` env variable and you can instantly start to compile your Go programs.
```
tar -xvzf go1.5.1.linux-armv7.tar.gz -C /usr/local
export PATH=/usr/local/go/bin:$PATH
```

Now let's test if it works.
```
which go
/usr/local/go/bin/go

go version
go version go1.5.1 linux/arm
```

Don't forget to set the `PATH` env variable within your `~/.bashrc` or `~/.profile` as well for your Linux user account.  
You can use this code snipped:
```
# set PATH so it includes GO bin if it exists
if [ -d "/usr/local/go/bin" ] ; then
    PATH="/usr/local/go/bin:$PATH"
fi
```

## How to create a pre-compiled GOLANG 1.4 tarball
Unfortunately there are no pre-compiled GOLANG tarballs for ARM officially available yet and
the preferred way to build such a tarball from source isn't well documented at all.

This is a simple approach to compile Go from source and package it as a tarball. This tarball
should work like the official tarballs from the [GOLANG download page](https://golang.org/dl/).
For the sake of simplicity this build steps are meant to be used on a freshly installed Linux
distro on any ARM machine.

Please feel free to use this build recipe and report any issues AND when you could
successfully build Go on a new machine. And don't forget to send us this informations
so we can include this machine to the list of supported devices!

### 1. Prepare the build machine

Just install all necessary packages, for details see the official guide
[Installing Go from source](https://golang.org/doc/install/source).
At least you'll need `gcc` to compile Go 1.4 from source and additionally `curl` and `git`.

For a [Scaleway](https://www.scaleway.com) C1 server (Ubuntu 15.04): ARMv7
```
apt-get update
apt-get install -y build-essential
```

For a Raspberry Pi A, A+, B, B+ (HypriotOS 0.6.1 "hector"): ARMv6  
For a Raspberry Pi 2B (HypriotOS 0.6.1 "hector"): ARMv7
```
apt-get update
apt-get install -y build-essential
```

For a Nvidia Jetson TK1 (Ubuntu 14.04.1 LTS): ARMv7
```
apt-get update
apt-get install -y build-essential
```

### 2. Clone this repo
```
git clone https://github.com/hypriot/golang-armbuilds.git
cd golang-armbuilds
```

### 3. Run the compile script
Here you can easily parameterize your build with `GOARM` (5, 6, 7. Default=7) and
`GO_VERSION` (1.4, 1.4.1, 1.4.2, 1.4.3. Default=1.4.3) variables.
```
./make-tarball-go1.4.sh |& tee make-tarball-go1.4.3-armv7.log

export GO_VERSION=1.4.2 && ./make-tarball-go1.4.sh |& tee make-tarball-go${GO_VERSION}-armv7.log

export GOARM=5 GO_VERSION=1.4.1 && ./make-tarball-go1.4.sh |& tee make-tarball-go${GO_VERSION}-armv${GOARM}.log
```

While compiling GOLANG from source all the tests will be run by default, which
will take a lot of time. If you'd just like to create the binary tarball without
actually running the full test suite, you can easily skip the tests by setting
the env variable `SKIP_TESTS` to anything.
```
export SKIP_TESTS=1
```
On some of the Linux ARM devices the tests are failing! So keep this option in
mind and deactivate testing.

### 4. Use it directly or upload the created tarball to GitHub releases
```
go1.4.3.linux-armv5.tar.gz
go1.4.3.linux-armv6.tar.gz
go1.4.3.linux-armv7.tar.gz
```

## How to create a pre-compiled GOLANG 1.5 tarball
In order to build Go 1.5 from source, we need to have at least a Go 1.4 version installed on
our dev machine and additionally `curl` and `git`. For this reason we just install our pre-compiled
Go 1.4 tarball and use it to bootstrap Go 1.5 with it.

### 1. Prepare the build machine

Just install all necessary packages, for details see the official guide
[Installing Go from source](https://golang.org/doc/install/source).

For a [Scaleway](https://www.scaleway.com) C1 server (Ubuntu 15.04): ARMv7
```
apt-get update
apt-get install -y build-essential
```

For a Raspberry Pi A, A+, B, B+ (HypriotOS 0.6.1 "hector"): ARMv6  
For a Raspberry Pi 2B (HypriotOS 0.6.1 "hector"): ARMv7
```
apt-get update
apt-get install -y build-essential
```

For a Nvidia Jetson TK1 (Ubuntu 14.04.1 LTS): ARMv7
```
apt-get update
apt-get install -y build-essential
```

### 2. Clone this repo
```
git clone https://github.com/hypriot/golang-armbuilds.git
cd golang-armbuilds
```

### 3. Run the compile script
Here you can easily parameterize your build with `GOARM` (5, 6, 7. Default=7)
and `GO_VERSION` (1.5, 1.5.1. Default=1.5.1) variables.

For bootstrapping Go1.5 we need to install Go1.4 first, which is also able to parameterize with
`GO_BOOTSTRAP_GOARM` (5, 6, 7. Default=7)
and `GO_BOOTSTRAP_VERSION` (1.4, 1.4.1, 1.4.2, 1.4.3. Default=1.4.3).
```
export GOARM=5 && ./make-tarball-go1.5.sh |& tee make-tarball-go1.5.1-armv${GOARM}.log
export GOARM=6 && ./make-tarball-go1.5.sh |& tee make-tarball-go1.5.1-armv${GOARM}.log
export GOARM=7 && ./make-tarball-go1.5.sh |& tee make-tarball-go1.5.1-armv${GOARM}.log
```

### 4. Use it directly or upload the created tarball to GitHub releases
```
go1.5.1.linux-armv5.tar.gz
go1.5.1.linux-armv6.tar.gz
go1.5.1.linux-armv7.tar.gz
```

## Building within a Docker container
```
docker build --build-arg GOARM=7 --build-arg GO_VERSION=1.4.3 -t golang-builder -f Dockerfile.arm .
docker run --rm golang-builder tar cf - go1.4.3.linux-armv7.tar.gz | tar xvf -
```

## How to bootstrap a GOLANG 1.5 tarball for ARM64 and PPC64
As there is no Go 1.4 support for ARM64 or PPC64 available, the process to compile
Go 1.5 on these platforms is a little bit different. But luckily Dave Cheney provided
an easy to follow tutorial how to bootstrap a Go 1.5.1 tarball on OSX or Intel Linux.
As we are working mostly on ARM, we just used the same steps on an ARMv7 machine.

### 1. Create a bootstrap tarball for ARM64 on an ARMv7 machine
Everything is available as a shell script, so it's damn easy to reproduce. But you
can find the generated bootstrap tarball for ARM64 as well as the log file from
this script in the release section.
```
time ./bootstrap-tarball-go1.5.1-arm64.sh | tee bootstrap-tarball-go1.5.1-arm64.log
```
```
ls -al *arm64*
-rw-rw-r-- 1 ubuntu ubuntu    11917 Jan  2 15:20 bootstrap-tarball-go1.5.1-arm64.log
-rwxrwxr-x 1 ubuntu ubuntu     1353 Jan  2 15:08 bootstrap-tarball-go1.5.1-arm64.sh
-rw-rw-r-- 1 ubuntu ubuntu 45354608 Jan  2 15:20 go-linux-arm64-bootstrap.tbz
```

### 2. Use the bootstrap tarball on an ARM64 machine to create a pre-compiled GOLANG 1.5 tarball
To decompress the bootstrap tarball `go-linux-arm64-bootstrap.tbz` we need to install
`bzip2` first.
```
sudo apt-get install -y bzip2
```

Now let's compile Go 1.5.1 natively on ARM64 using the bootstrap tarball we have
already created on ARMv7.
```
time SKIP_TESTS=1 ./make-tarball-go1.5-arm64.sh
```

## Known issues
On Scaleway one of the GOLANG tests are already failing:
```
--- FAIL: TestFilePacketConn (0.01s)
	file_test.go:121: WriteTo failed: write ip: bad address
FAIL
FAIL	net	3.108s
```
This failure seems to be already documented in https://github.com/golang/go/issues/10730.

## TODO
- [x] include the standard GOLANG tests for all builds
- [x] run builds for ARMv5, ARMv6 and ARMv7
- [x] run builds for ARM64 (aka ARMv8 or Aarch64)
- [ ] automate builds via CI/CD (travis or circle-ci)
- [ ] cleanup README.md
- [x] detailed documentation for building GOLANG from scratch, see http://blog.hypriot.com/post/how-to-compile-go-on-arm/
- [ ] detailed documentation for setting up a CI build pipeline

## Additional sources for building GOLANG on ARM
- GoArm Wiki, https://github.com/golang/go/wiki/GoArm
- Build from source, http://dave.cheney.net/2015/09/04/building-go-1-5-on-the-raspberry-pi by Dave Cheney
- Cross compile, http://dave.cheney.net/2015/08/22/cross-compilation-with-go-1-5 by Dave Cheney
- Unofficial ARM tarballs for Go, http://dave.cheney.net/unofficial-arm-tarballs by Dave Cheney
- Issue golang/go/#13066: build: provide ARM release binaries?, https://github.com/golang/go/issues/13066
- Bootstrapping Go 1.5 on non Intel platforms, http://dave.cheney.net/2015/10/16/bootstrapping-go-1-5-on-non-intel-platforms by Dave Cheney

# Acknowledgements
Many thanks to the GOLANG team at Google and all maintainers and contributers.

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