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roat

Continuous integration server

Roat

Roat is an automation core, well suited for implementing a Continuous Integration server. Its primary focus is to trigger the running of scripts based on detecting pushes to source code repositories. There is also a web interface for inspecting the current state and manually triggering scripts.

Configuration

Roat will read configuration from config.json by default, or the filename specified with the --config command line argument if present. For a complete example configuration file, please refer to example.config.json.

The configuration is a dictionary ({}) split into the following sections:

The application listens to http connections on the specified port and binds to the specified address:

"http": {
    "port": 9999,
    "bind": "127.0.0.1"
}

The defaults are 0 (automatic assignment) for port and 0.0.0.0 (listen to connections from all source addresses) for bind.

It is also possible to specify these options on the command line with the --port and --bind command line arguments.

The scripts the Roat server runs are specified as actions in the config:

"actions": {
    <action-id>: <action-spec>,
    <action-id>: <action-spec>,
    ...
}

The <action-id> is used to refer to a specific action by other subsystems.

<action-spec> has a human readable title, a command line specified as a list in cmd, optionally the desired working directory as cwd and optionally necessary environmental variables in env:

"ls-color": {
    "title": "List files",
    "cmd": [ "ls", "-lhaG" ],
    "cwd": "/root",
    "env": {
        "CLICOLOR_FORCE": "true"
    }
}

Normally, an action will execute in a new subprocess every time it is triggered. Alternative running modes exist and are specified in the "mode" field, for example:

{
    ...
    "mode": "exclusive"
}

Available modes are:

  • immediate: The default. Start a new subprocess immediately, every time the action is triggered.
  • exclusive: When the action is triggered, Roat will kill currently running instances before starting a new subprocess.
  • queue: Run at most one instance of this action at a time, but wait for any currently running process to finish instead of killing it.

Roat listens for github WebHook messages on its /github URL.

The github subsystem triggers actions based on which repository was updated:

"github": {
    <repository-URL>: <action-ids>,
    <repository-URL>: <action-ids>,
    ...
}

For example:

"github": {
    "https://github.com/octokitty/testing": "ls-color",
    "https://github.com/octokitty/schmesting": [ "ls-color", "ls" ]
}

Note that you are required to use the full URL, with the https scheme and no trailing slash.

Roat listens for bitbucket's POST Service messages on its /bitbucket URL.

The bitbucket subsystem triggers actions based on which repository was updated:

"bitbucket": {
    <repository-URL>: <action-ids>,
    <repository-URL>: <action-ids>,
    ...
}

For example:

"bitbucket": {
    "/jespern/bitbucket/": "ls-color",
    "/jespern/git-7/": [ "ls-color", "ls" ]
}

Note that you are required to use only the path-part of the URL, including a trailing slash. The format is /<username>/<repository-name>/.

Roat will trigger the configured actions automatically on start:

"autostart": [
    <action-id>,
    <action-id>,
    ...
]

For example:

"autostart": [
    "ls-color"
]

In order to be kind to the host machine, it starts the configured services one at a time, separated by one second in time.

Roat will direct log output to the transports specified under this key:

"log": [
    <transport>,
    <transport>,
    ...
]

For example:

"log": [
    {
        "transport": "console"
    }, {
        "transport": "syslog"
    }
]

Roat uses logginator for logging and log target configuration. For further details about this config, please consult the logginator documentation.

Running

When you have configured roat, you can run

npm start

It will output something like:

12:30:34.566 2013-05-27 Monday
12:30:34.570 [roat] Version 1.1.3 (on node v0.10.7)
12:30:34.583 [roat, http] Listening on 127.0.0.1:9999

Visit the specified address in a web browser (http://127.0.0.1:9999) to inspect the current system status.

Add a WebHook URL to your repositories in github to allow Roat to react to pushes to github. The POST from github must reach the /github endpoint of Roat to allow this to work.

Happy automation!


Development of Roat is lovingly sponsored by BRIK Videobase AS in Bergen, Norway.