# Build xds-agent from scratch

## Dependencies

Install [Go](https://golang.org/doc/install), [npm](https://www.npmjs.com/),
[nodejs](https://nodejs.org/en/) and some other tools.

Refer to [Prerequisites chapter](../1_Prerequisites.html) for more details.

## Building

Clone this repo into your `$GOPATH/src/gerrit.automotivelinux.org/gerrit/src/xds` and use delivered Makefile:

```bash
 mkdir -p $GOPATH/src/gerrit.automotivelinux.org/gerrit/src/xds
 cd $GOPATH/src/gerrit.automotivelinux.org/gerrit/src/xds
 git clone https://gerrit.automotivelinux.org/gerrit/src/xds/xds-agent
 # or git clone ssh://YOUR_USERNAME@gerrit.automotivelinux.org:29418/src/xds/xds-agent
 cd xds-agent
 make all
```

And to install xds-agent (by default in `/usr/local/bin`):

```bash
make install
```

>**Note:**
>
>Used `DESTDIR` to specify another install directory
>```bash
>make install DESTDIR=$HOME/opt/xds-agent
>```

### Cross build

For example on a Linux machine to cross-build for Windows, just follow these steps.

The first time you need to install all the windows-amd64 standard packages on
your system with

```bash
# List all supported OS / ARCH
go tool dist list

# Install all standard packages for another OS/ARCH (eg. windows amd64)
GOOS=windows GOARCH=amd64 go install -v -a std
```

Then compile and package xds-agent using provided makefile

```bash
export GOOS=windows
export GOARCH=amd64
make all
make package
```