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# XDS - X(cross) Development System Agent
XDS-agent is a client that should run on your local / user development machine when you use XDS.
This agent takes care, among others, of starting [Syncthing](https://syncthing.net/)
tool to synchronize your project files from your local host to XDS build server
machine or container (where `xds-server` is running).
> **SEE ALSO**: [xds-server](https://github.com/iotbzh/xds-server), a web server
used to remotely cross build applications.
## Configuration
xds-agent configuration is driven by a JSON config file (named `agent-config.json`).
The tarball mentioned in previous section includes this file with default settings.
Here is the logic to determine which `agent-config.json` file will be used:
1. from command line option: `--config myConfig.json`
1. `$HOME/.xds/agent/agent-config.json` file
1. `/etc/xds-agent/agent-config.json` file
1. `<xds-agent executable dir>/agent-config.json` file
Supported fields in configuration file are (all fields are optional and example
below corresponds to the default values):
- **httpPort** : http port of agent REST interface
- **logsDir** : directory to store logs (eg. syncthing output)
- **xds-apikey** : xds-agent api-key to use (always set value to "1234abcezam")
- **syncthing.binDir** : syncthing binaries directory (default: executable directory)
- **syncthing.home"** : syncthing home directory (usually .../syncthing-config)
- **syncthing.gui-address** : syncthing gui url (default http://localhost:8384)
- **syncthing.gui-apikey** : syncthing api-key to use (default auto-generated)
```json
{
"httpPort": "8010",
"logsDir": "/tmp/logs",
"xds-apikey": "1234abcezam",
"syncthing": {
"binDir": ".",
"home": "${HOME}/.xds/agent/syncthing-config",
"gui-address": "http://localhost:8384",
"gui-apikey": "1234abcezam",
}
}
```
>**NOTE:** environment variables are supported by using `${MY_VAR}` syntax.
## Start-up
Simply to start `xds-agent` executable
```bash
./xds-agent &
```
>**NOTE** if need be, you can increase log level by setting option
`--log <level>`, supported *level* are: panic, fatal, error, warn, info, debug.
You can now use XDS dashboard and check that connection with `xds-agent` is up.
(see also [xds-server README](https://github.com/iotbzh/xds-server/blob/master/README.md#xds-dashboard))
## Build xds-agent from scratch
### Dependencies
Install and setup [Go](https://golang.org/doc/install) version 1.8 or
higher to compile this tool.
### Building
Clone this repo into your `$GOPATH/src/github.com/iotbzh` and use delivered Makefile:
```bash
mkdir -p $GOPATH/src/github.com/iotbzh
cd $GOPATH/src/github.com/iotbzh
git clone https://github.com/iotbzh/xds-agent.git
cd xds-agent
make all
```
And to install xds-agent (by default in `/usr/local/bin`):
```bash
make install
```
>**NOTE:** Used `DESTDIR` to specify another install directory
>```bash
>make install DESTDIR=$HOME/opt/xds-agent
>```
#### Cross build
For example on a Linux machine to cross-build for Windows, just execute:
```bash
export GOOS=windows
export GOARCH=amd64
make all
make package
```
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