helm_helpers.go

package helm

import (
	"fmt"
	"io/ioutil"
	"path/filepath"
	"sort"

	"github.com/ghodss/yaml"
	"github.com/jenkins-x/jx/pkg/util"
	"k8s.io/helm/pkg/chartutil"
)

const (
	RequirementsFileName = "requirements.yaml"

	DefaultHelmRepositoryURL = "http://jenkins-x-chartmuseum:8080"

	defaultEnvironmentChartDir = "env"
)

// copied from helm to minimise dependencies...

// Dependency describes a chart upon which another chart depends.
//
// Dependencies can be used to express developer intent, or to capture the state
// of a chart.
type Dependency struct {
	// Name is the name of the dependency.
	//
	// This must mach the name in the dependency's Chart.yaml.
	Name string `json:"name"`
	// Version is the version (range) of this chart.
	//
	// A lock file will always produce a single version, while a dependency
	// may contain a semantic version range.
	Version string `json:"version,omitempty"`
	// The URL to the repository.
	//
	// Appending `index.yaml` to this string should result in a URL that can be
	// used to fetch the repository index.
	Repository string `json:"repository"`
	// A yaml path that resolves to a boolean, used for enabling/disabling charts (e.g. subchart1.enabled )
	Condition string `json:"condition,omitempty"`
	// Tags can be used to group charts for enabling/disabling together
	Tags []string `json:"tags,omitempty"`
	// Enabled bool determines if chart should be loaded
	Enabled bool `json:"enabled,omitempty"`
	// ImportValues holds the mapping of source values to parent key to be imported. Each item can be a
	// string or pair of child/parent sublist items.
	ImportValues []interface{} `json:"import-values,omitempty"`
	// Alias usable alias to be used for the chart
	Alias string `json:"alias,omitempty"`
}

// ErrNoRequirementsFile to detect error condition
type ErrNoRequirementsFile error

// Requirements is a list of requirements for a chart.
//
// Requirements are charts upon which this chart depends. This expresses
// developer intent.
type Requirements struct {
	Dependencies []*Dependency `json:"dependencies"`
}

// DepSorter Used to avoid merge conflicts by sorting deps by name
type DepSorter []*Dependency

func (a DepSorter) Len() int           { return len(a) }
func (a DepSorter) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a DepSorter) Less(i, j int) bool { return a[i].Name < a[j].Name }

// SetAppVersion sets the version of the app to use
func (r *Requirements) SetAppVersion(app string, version string, repository string, alias string) {
	if r.Dependencies == nil {
		r.Dependencies = []*Dependency{}
	}
	for _, dep := range r.Dependencies {
		if dep != nil && dep.Name == app {
			dep.Version = version
			dep.Repository = repository
			dep.Alias = alias
			return
		}
	}
	r.Dependencies = append(r.Dependencies, &Dependency{
		Name:       app,
		Version:    version,
		Repository: repository,
		Alias:      alias,
	})
	sort.Sort(DepSorter(r.Dependencies))
}

// RemoveApp removes the given app name. Returns true if a dependency was removed
func (r *Requirements) RemoveApp(app string) bool {
	for i, dep := range r.Dependencies {
		if dep != nil && dep.Name == app {
			r.Dependencies = append(r.Dependencies[:i], r.Dependencies[i+1:]...)
			sort.Sort(DepSorter(r.Dependencies))
			return true
		}
	}
	return false
}

// FindRequirementsFileName returns the default requirements.yaml file name
func FindRequirementsFileName(dir string) (string, error) {
	names := []string{
		filepath.Join(dir, defaultEnvironmentChartDir, RequirementsFileName),
		filepath.Join(dir, RequirementsFileName),
	}
	for _, name := range names {
		exists, err := util.FileExists(name)
		if err != nil {
			return "", err
		}
		if exists {
			return name, nil
		}
	}
	files, err := ioutil.ReadDir(dir)
	if err != nil {
		return "", err
	}
	for _, f := range files {
		if f.IsDir() {
			name := filepath.Join(dir, f.Name(), RequirementsFileName)
			exists, err := util.FileExists(name)
			if err != nil {
				return "", err
			}
			if exists {
				return name, nil
			}
		}
	}
	dirs := []string{
		filepath.Join(dir, defaultEnvironmentChartDir),
		dir,
	}
	for _, d := range dirs {
		name := filepath.Join(d, RequirementsFileName)
		exists, err := util.FileExists(d)
		if err != nil {
			return "", err
		}
		if exists {
			return name, nil
		}
	}
	return "", fmt.Errorf("Could not deduce the default requirements.yaml file name")
}

// LoadRequirementsFile loads the requirements file or creates empty requirements if the file does not exist
func LoadRequirementsFile(fileName string) (*Requirements, error) {
	exists, err := util.FileExists(fileName)
	if err != nil {
		return nil, err
	}
	if exists {
		data, err := ioutil.ReadFile(fileName)
		if err != nil {
			return nil, err
		}
		return LoadRequirements(data)
	}
	r := &Requirements{}
	return r, nil
}

// LoadRequirements loads the requirements from some data
func LoadRequirements(data []byte) (*Requirements, error) {
	r := &Requirements{}
	return r, yaml.Unmarshal(data, r)
}

// SaveRequirementsFile saves the requirements file
func SaveRequirementsFile(fileName string, requirements *Requirements) error {
	data, err := yaml.Marshal(requirements)
	if err != nil {
		return err
	}
	return ioutil.WriteFile(fileName, data, util.DefaultWritePermissions)
}

func LoadChartName(chartFile string) (string, error) {
	chart, err := chartutil.LoadChartfile(chartFile)
	if err != nil {
		return "", err
	}
	return chart.Name, nil
}

func LoadChartNameAndVersion(chartFile string) (string, string, error) {
	chart, err := chartutil.LoadChartfile(chartFile)
	if err != nil {
		return "", "", err
	}
	return chart.Name, chart.Version, nil
}