Devfile Library

About

The Devfile Parser library is a Golang module that:

parses the devfile.yaml as specified by the api & schema.
writes to the devfile.yaml with the updated data.
generates Kubernetes objects for the various devfile resources.
defines util functions for the devfile.

Usage

The function documentation can be accessed via pkg.go.dev.

To parse a devfile, visit parse.go source file

// ParserArgs is the struct to pass into parser functions which contains required info for parsing devfile.
parserArgs := parser.ParserArgs{
 	Path:              path,
 	FlattenedDevfile:  &flattenedDevfile,
 	RegistryURLs:      registryURLs,
 	DefaultNamespace:  defaultNamespace,
 	Context:           context,
 	K8sClient:         client,
 }

// Parses the devfile and validates the devfile data
// if top-level variables are not substituted successfully, the warnings can be logged by parsing variableWarning
devfile, variableWarning, err := devfilePkg.ParseDevfileAndValidate(parserArgs)

To get specific content from devfile

// To get all the components from the devfile
components, err := devfile.Data.GetComponents(DevfileOptions{})

// To get all the components from the devfile with attributes tagged - tool: console-import
// & import: {strategy: Dockerfile}
components, err := devfile.Data.GetComponents(DevfileOptions{
   Filter: map[string]interface{}{
 		"tool": "console-import",
 		"import": map[string]interface{}{
 			"strategy": "Dockerfile",
 		},
 	},
})

// To get all the volume components
components, err := devfile.Data.GetComponents(DevfileOptions{
 	ComponentOptions: ComponentOptions{
 		ComponentType: v1.VolumeComponentType,
 	},
})

// To get all the exec commands that belong to the build group
commands, err := devfile.Data.GetCommands(DevfileOptions{
 	CommandOptions: CommandOptions{
 		CommandType: v1.ExecCommandType,
 		CommandGroupKind: v1.BuildCommandGroupKind,
 	},
})

To get the Kubernetes objects from the devfile, visit generators.go source file

 // To get a slice of Kubernetes containers of type corev1.Container from the devfile component containers
 containers, err := generator.GetContainers(devfile)

 // To generate a Kubernetes deployment of type v1.Deployment
 deployParams := generator.DeploymentParams{
 	TypeMeta:          generator.GetTypeMeta(deploymentKind, deploymentAPIVersion),
 	ObjectMeta:        generator.GetObjectMeta(name, namespace, labels, annotations),
 	InitContainers:    initContainers,
 	Containers:        containers,
 	Volumes:           volumes,
 	PodSelectorLabels: labels,
 }
 deployment := generator.GetDeployment(deployParams)

To update devfile content

// To update an existing component in devfile object
err := devfile.Data.UpdateComponent(v1.Component{
	    Name: "component1",
	    ComponentUnion: v1.ComponentUnion{
	    	Container: &v1.ContainerComponent{
	    		Container: v1.Container{
	    			Image: "image1",
             },
         },
     },
})

// To add a new component to devfile object
err := devfile.Data.AddComponents([]v1.Component{
     {
        Name: "component2",
        ComponentUnion: v1.ComponentUnion{
            Container: &v1.ContainerComponent{
                Container: v1.Container{
                    Image: "image2",
                },
            },
        },
     },
})

// To delete a component from the devfile object
err := devfile.Data.DeleteComponent(componentName)

To write to a devfile, visit writer.go source file

// If the devfile object has been created with devfile path already set, can simply call WriteYamlDevfile to writes the devfile
err := devfile.WriteYamlDevfile()


// To write to a devfile from scratch
// create a new DevfileData with a specific devfile version
devfileData, err := data.NewDevfileData(devfileVersion)

// set schema version
devfileData.SetSchemaVersion(devfileVersion)

// add devfile content use library APIs
devfileData.AddComponents([]v1.Component{...})
devfileData.AddCommands([]v1.Commands{...})
......

// create a new DevfileCtx
ctx := devfileCtx.NewDevfileCtx(devfilePath)
err = ctx.SetAbsPath()

// create devfile object with the new DevfileCtx and DevfileData
devfile := parser.DevfileObj{
 	Ctx:  ctx,
 	Data: devfileData,
}
 
// write to the devfile on disk
err = devfile.WriteYamlDevfile()

Updating Library Schema

Executing ./scripts/updateApi.sh fetches the latest github.com/devfile/api go mod and updates the schema saved under pkg/devfile/parser/data

The script also accepts a version number as an argument to update the devfile schema for a specific devfile version. For example, running the following command will update the devfile schema for 2.0.0

./updateApi.sh 2.0.0

Running the script with no arguments will default to update the latest devfile version.

Projects using devfile/library

The following projects are consuming this library as a Golang dependency

Tests

To run unit tests and api tests. Visit library tests to find out more information on tests

make test

Issues

Issues are tracked in the devfile/api repo with the label area/library

Releases

For devfile/library releases, please check the release page.

Note: To generate a changelog for a new release, execute ./scripts/changelog-script.sh v1.x.y for all the changes since the release v1.x.y

# README