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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://gerrit.automotivelinux.org/gerrit/gitweb?p=src/xds/xds-server.git), a web server
used to remotely cross build applications.
## Configuration
xds-agent configuration is driven by a JSON config file.
The tarball mentioned in previous section includes this file with default settings.
Here is the logic to determine which conf file will be used:
1. from command line option: `--config myConfig.json`
1. `$HOME/.xds/agent/agent-config.json` file
1. `/etc/xds/agent/agent-config.json` file
Supported fields in configuration file are (all fields are optional and example
below corresponds to the default values):
- **httpPort** : http port of agent REST interface
- **webAppDir** : location of client webapp / dashboard (default: webapp/dist)
- **logsDir** : directory to store logs (eg. syncthing output)
- **xdsServers** : an array of xds-server object
- **xdsServers.url**: url of xds-server to connect to
- **syncthing**: a object defining syncthing settings
- **syncthing.binDir** : syncthing binaries directory (default: executable directory)
- **syncthing.home"** : syncthing home directory (usually .../syncthing-config)
- **syncthing.gui-address** : syncthing gui url (default <http://localhost:8386>)
- **syncthing.gui-apikey** : syncthing api-key to use (default auto-generated)
```json
{
"httpPort": "8800",
"webAppDir": "./www",
"logsDir": "${HOME}/.xds/agent/logs",
"xdsServers": [
{
"url": "http://localhost:8000"
}
],
"syncthing": {
"home": "${HOME}/.xds/agent/syncthing-config",
"gui-address": "http://localhost:8386",
"gui-apikey": "1234abcezam"
}
}
```
>**Note:**
>
>environment variables are supported by using `${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.
## 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](./0_Abstract.html#prerequisites) 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
```
## Debugging
### XDS agent architecture
The agent part is written in *Go* and the webapp / dashboard is in *typescript + Angular4*.
```bash
|
+-- bin/ where xds-server binary file will be built
|
+-- conf.d Linux configuration and startup files (systemd user service)
|
+-- glide.yaml Go package dependency file
|
+-- lib/ sources of server part (Go)
|
+-- main.go main entry point of of Web server (Go)
|
+-- Makefile makefile including
|
+-- README.md this readme
|
+-- scripts/ hold various scripts used for installation or startup
|
+-- tools/ temporary directory to hold development tools (like glide)
|
+-- vendor/ temporary directory to hold Go dependencies packages
|
+-- webapp/ source client basic webapp / dashboard
```
### Debug
Visual Studio Code launcher settings can be found into `.vscode/launch.json`.
>**Tricks:**
>
>To debug both `xds-agent` and `xds-server` or common code
>`xds-common`, it may be useful use the same local sources.
>
>So you should replace `xds-server` + `xds-common` in `vendor` directory by a symlink.
>
>So clone first `xds-server` + `xds-common` sources next to `xds-agent` directory.
You should have the following tree:
```bash
tree -L 5 --charset=ascii src/
src/
`-- gerrit.automotivelinux.org
`-- gerrit
`-- src
`-- xds
|-- backup.sh
|-- xds-agent
|-- xds-cli
|-- xds-common
|-- xds-docs
|-- xds-gdb
`-- xds-server
```
Then invoke `vendor/debug` Makefile rule to create a symlink inside vendor
directory :
```bash
cd src/gerrit.automotivelinux.org/gerrit/src/xds/xds-agent
make vendor/debug
```
|
