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ksonnet.go
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ksonnet.go
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package ksonnet
import (
"fmt"
"os/exec"
"regexp"
"strconv"
"strings"
"github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
"github.com/ghodss/yaml"
"github.com/ksonnet/ksonnet/metadata"
"github.com/ksonnet/ksonnet/metadata/app"
log "github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)
var (
diffSeparator = regexp.MustCompile(`\n---`)
lineSeparator = regexp.MustCompile(`\n`)
)
// 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
// App is the Ksonnet application
App() app.App
// Show returns a list of unstructured objects that would be applied to an environment
Show(environment string) ([]*unstructured.Unstructured, error)
// ListEnvParams returns list of environment parameters
ListEnvParams(environment string) ([]*v1alpha1.ComponentParameter, error)
// SetComponentParams updates component parameter in specified environment.
SetComponentParams(environment string, component string, param string, value string) error
}
type ksonnetApp struct {
manager metadata.Manager
app app.App
}
// NewKsonnetApp tries to create a new wrapper to run commands on the `ks` command-line tool.
func NewKsonnetApp(path string) (KsonnetApp, error) {
ksApp := ksonnetApp{}
mgr, err := metadata.Find(path)
if err != nil {
return nil, err
}
ksApp.manager = mgr
app, err := ksApp.manager.App()
if err != nil {
return nil, err
}
ksApp.app = app
return &ksApp, nil
}
func (k *ksonnetApp) ksCmd(args ...string) (string, error) {
cmd := exec.Command("ks", args...)
cmd.Dir = k.Root()
cmdStr := strings.Join(cmd.Args, " ")
log.Debug(cmdStr)
out, err := cmd.Output()
if err != nil {
exErr, ok := err.(*exec.ExitError)
if !ok {
return "", err
}
errOutput := string(exErr.Stderr)
log.Errorf("`%s` failed: %s", cmdStr, errOutput)
return "", fmt.Errorf(strings.TrimSpace(errOutput))
}
return string(out), nil
}
func (k *ksonnetApp) Root() string {
return k.manager.Root()
}
// Spec is the Ksonnet application spec (app.yaml)
func (k *ksonnetApp) App() app.App {
return k.app
}
// 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, err
}
parts := diffSeparator.Split(out, -1)
objs := make([]*unstructured.Unstructured, 0)
for _, part := range parts {
if strings.TrimSpace(part) == "" {
continue
}
var obj unstructured.Unstructured
err = yaml.Unmarshal([]byte(part), &obj)
if err != nil {
return nil, fmt.Errorf("Failed to unmarshal manifest from `ks show`")
}
objs = append(objs, &obj)
}
// TODO(jessesuen): we need to sort objects based on their dependency order of creation
return objs, nil
}
// ListEnvParams returns list of environment parameters
func (k *ksonnetApp) ListEnvParams(environment string) ([]*v1alpha1.ComponentParameter, error) {
// count of rows to skip in command-line output
const skipRows = 2
out, err := k.ksCmd("param", "list", "--env", environment)
if err != nil {
return nil, err
}
var params []*v1alpha1.ComponentParameter
rows := lineSeparator.Split(out, -1)
for _, row := range rows[skipRows:] {
if strings.TrimSpace(row) == "" {
continue
}
fields := strings.Fields(row)
component, param, rawValue := fields[0], fields[1], fields[2]
value, err := strconv.Unquote(rawValue)
if err != nil {
value = rawValue
}
componentParam := v1alpha1.ComponentParameter{
Component: component,
Name: param,
Value: value,
}
params = append(params, &componentParam)
}
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
}