Flod is the Continous Integration Tool for Gothenburg Bit Factory
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Flod2 - Lightweight Continuous Integration

Flod2 uses the simplest, most flexible technology to create a CI solution that uses minimal resources, yet delivers build status as fast as possible.


Flod consists of one main component, and a set of focussed support scripts.

The 'central' binary is a queue management tool that triggers hook scripts when event files are queued. Central can create, destroy, hook, unhook and process queues. Central knows nothing about CI, but does know how to manage workflow.

The most important of the scripts is the 'build_vm' script, which instantiates a new VM, provisions that VM, then builds and tests the project, queueing the results.

The combined effect of queues and hook scripts is a graph of dependent functionality that implements the complex workflow of CI.


   git        +------+      +------+      +------+      +------+      +------+      +-------+
   commit --> |change| -+-> |build | -+-> |result| ---> |digest| -+-> |clean | -+-> |publish|
              |      |  |   | P1   |  |   |      |      |      |  |   |      |  |   |       |
              +------+  |   +------+  |   +------+      +------+  |   +------+  |   +-------+
                        |             |                           |             |
                        |   +------+  |                           +-------------+
                        +-> |build | -+
                        |   | P2   |  |
                        |   +------+  |
                        |             |
                        |   +------+  |
                        +-> |build | -+
                            | P3   |

Git: commit

When a project commit is made, either a 'post-commit' or 'post-receive' git hook script composes and posts a change event.

Queue: change

The 'platforms' script is triggered by a change event. Using a combination of details in the change event and central configuration, it determines the set of supported platforms, and their associated details and commands.

A build event is created for each platform, and queued in the corresponding build_{platform} queue.

Queue: build_{platform}

The 'build_local', 'build_remote', or 'build_vm' script is triggered by a build event, depending on which script was used to hook build events.

The 'build_local' script is the simplest, and it creates a work directory, then clones the project, builds and tests it. The combined log of all this is added as the payload in a result event which is queued.

The 'build_remote' script does all this on a remote machine.

The 'build_vm' script does all the above but instantiates and provisions a VM, then destroys it afterwards. This script may also simply power up an already created VM and power it down afterwards.

The three scripts generate identical result events. It is important that a complete capture of all commands is in the result. This allows an upgraded central to re-process results when new capabilities are added. In the case of 'build_vm', the full log is needed because the VM may no longer exist, and diagnosis is more difficult.

Queue: result

The 'thresher' script is triggered by a result event, and has the task of separating the wheat from the chaff. This means taking a full build transcript, and reducing it to only the interesting parts, which includes warnings, errors and test results. This result is a digest event.

Queue: digest

A digest event triggers two scripts. The first is a report script, which builds the tinderbox report. It stores the thresher results in a platform file. It then combines platform files into a commit file, representing the results for all platforms for a specific commit. Then it combines commit files into a full report. The resulting HTML file path is referenced in a publish event.

If the commit result across all platforms is considered good, then a 'clean' event is posted.

The second is the summary script, which creates the overall summary page you see on https://central.tasktools.org. This too is added as payload to a report, which is referenced in a publish event.

Queue: clean

A clean event triggers two scripts. The first is a coverage script, which runs a coverage tool, generating a coverage report, which is then queued for publishing.

The second script is a snapshot script that creates a snapshot tarball, which is referenced in a publish event.

Queue: publish

A publish event triggers an rsync/scp of a file in the event, to a web server.