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ksonnet.go
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ksonnet.go
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package ksonnet
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
executil "github.com/argoproj/gitops-engine/pkg/utils/exec"
"github.com/argoproj/gitops-engine/pkg/utils/kube"
"github.com/ghodss/yaml"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
)
// Destination returns the deployment destination for an environment in app spec data
func Destination(data []byte, environment string) (*v1alpha1.ApplicationDestination, error) {
var appSpec struct {
Environments map[string]struct {
Destination v1alpha1.ApplicationDestination
}
}
err := yaml.Unmarshal(data, &appSpec)
if err != nil {
return nil, fmt.Errorf("could not unmarshal ksonnet spec app.yaml: %v", err)
}
envSpec, ok := appSpec.Environments[environment]
if !ok {
return nil, fmt.Errorf("environment '%s' does not exist in ksonnet app", environment)
}
return &envSpec.Destination, nil
}
// KsonnetApp represents a ksonnet application directory and provides wrapper functionality around
// the `ks` command.
type KsonnetApp interface {
// Root is the root path ksonnet application directory
Root() string
// Show returns a list of unstructured objects that would be applied to an environment
Show(environment string) ([]*unstructured.Unstructured, error)
// Destination returns the deployment destination for an environment
Destination(environment string) (*v1alpha1.ApplicationDestination, error)
// ListParams returns list of ksonnet parameters
ListParams(environment string) ([]*v1alpha1.KsonnetParameter, error)
// SetComponentParams updates component parameter in specified environment.
SetComponentParams(environment string, component string, param string, value string) error
}
// Version returns the version of ksonnet used when running ksonnet commands
func Version() (string, error) {
ksApp := ksonnetApp{}
out, err := ksApp.ksCmd("", "version")
if err != nil {
return "", fmt.Errorf("unable to determine ksonnet version: %v", err)
}
ksonnetVersionStr := strings.Split(out, "\n")[0]
parts := strings.SplitN(ksonnetVersionStr, ":", 2)
if len(parts) != 2 {
return "", fmt.Errorf("unexpected version string format: %s", ksonnetVersionStr)
}
version := strings.TrimSpace(parts[1])
if version[0] != 'v' {
version = "v" + version
}
return version, nil
}
type ksonnetApp struct {
rootDir string
}
// NewKsonnetApp tries to create a new wrapper to run commands on the `ks` command-line tool.
func NewKsonnetApp(path string) (KsonnetApp, error) {
ksApp := ksonnetApp{rootDir: path}
// ensure that the file exists
if _, err := ksApp.appYamlPath(); err != nil {
return nil, err
}
return &ksApp, nil
}
func (k *ksonnetApp) appYamlPath() (string, error) {
const appYamlName = "app.yaml"
p := filepath.Join(k.Root(), appYamlName)
if _, err := os.Stat(p); err != nil {
return "", err
}
return p, nil
}
func (k *ksonnetApp) ksCmd(args ...string) (string, error) {
cmd := exec.Command("ks", args...)
cmd.Dir = k.Root()
return executil.Run(cmd)
}
func (k *ksonnetApp) Root() string {
return k.rootDir
}
// Show generates a concatenated list of Kubernetes manifests in the given environment.
func (k *ksonnetApp) Show(environment string) ([]*unstructured.Unstructured, error) {
out, err := k.ksCmd("show", environment)
if err != nil {
return nil, fmt.Errorf("`ks show` failed: %v", err)
}
return kube.SplitYAML(out)
}
// Destination returns the deployment destination for an environment
func (k *ksonnetApp) Destination(environment string) (*v1alpha1.ApplicationDestination, error) {
p, err := k.appYamlPath()
if err != nil {
return nil, err
}
data, err := ioutil.ReadFile(p)
if err != nil {
return nil, err
}
return Destination(data, environment)
}
// ListParams returns list of ksonnet parameters
func (k *ksonnetApp) ListParams(environment string) ([]*v1alpha1.KsonnetParameter, error) {
args := []string{"param", "list", "--output", "json"}
if environment != "" {
args = append(args, "--env", environment)
}
out, err := k.ksCmd(args...)
if err != nil {
return nil, err
}
// Auxiliary data to hold unmarshaled JSON output, which may use different field names
var ksParams struct {
Data []struct {
Component string `json:"component"`
Key string `json:"param"`
Value string `json:"value"`
} `json:"data"`
}
if err := json.Unmarshal([]byte(out), &ksParams); err != nil {
return nil, err
}
var params []*v1alpha1.KsonnetParameter
for _, ksParam := range ksParams.Data {
value := strings.Trim(ksParam.Value, `'"`)
params = append(params, &v1alpha1.KsonnetParameter{
Component: ksParam.Component,
Name: ksParam.Key,
Value: value,
})
}
return params, nil
}
// SetComponentParams updates component parameter in specified environment.
func (k *ksonnetApp) SetComponentParams(environment string, component string, param string, value string) error {
_, err := k.ksCmd("param", "set", component, param, value, "--env", environment)
return err
}