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common.go
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common.go
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package helm
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"encoding/base64"
"github.com/pkg/errors"
"github.com/rancher/rancher/pkg/controllers/user/helm/common"
"github.com/rancher/rancher/pkg/jailer"
"github.com/rancher/rancher/pkg/templatecontent"
mgmtv3 "github.com/rancher/types/apis/management.cattle.io/v3"
v3 "github.com/rancher/types/apis/project.cattle.io/v3"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
helmName = "helm"
kubectl = "kubectl"
appLabel = "io.cattle.field/appId"
failedLabel = "io.cattle.field/failed-revision"
kcEnv = "KUBECONFIG"
)
func WriteTempDir(tempDirs *common.HelmPath, files map[string]string) error {
for name, content := range files {
fp := filepath.Join(tempDirs.FullPath, name)
if err := os.MkdirAll(filepath.Dir(fp), 0755); err != nil {
return err
}
if err := ioutil.WriteFile(fp, []byte(content), 0755); err != nil {
return err
}
}
for name := range files {
parts := strings.Split(name, "/")
if len(parts) > 0 {
tempDirs.AppDirFull = filepath.Join(tempDirs.FullPath, parts[0])
tempDirs.AppDirInJail = filepath.Join(tempDirs.InJailPath, parts[0])
return nil
}
}
return nil
}
func kubectlApply(template, kubeconfig string, app *v3.App) error {
file, err := ioutil.TempFile("", "app-template")
if err != nil {
return err
}
defer os.RemoveAll(file.Name())
if err := ioutil.WriteFile(file.Name(), []byte(template), 0755); err != nil {
return err
}
command := []string{"apply", "--all", "--overwrite", "-n", app.Spec.TargetNamespace, "-f", file.Name()}
if app.Spec.Prune {
command = append(command, "--prune")
}
cmd := exec.Command(kubectl, command...)
cmd.Env = []string{fmt.Sprintf("%s=%s", kcEnv, kubeconfig)}
sbErr := &bytes.Buffer{}
cmd.Stdout = os.Stdout
cmd.Stderr = sbErr
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
return errors.Wrapf(err, fmt.Sprintf("Kubectl apply failed. Error: %s", filterErrorMessage(sbErr.String(), file.Name(), "app-template")))
}
// wait for resources to be created and try 5 times
// todo: there is a bug around rolebindings that are being deleted if created outside rancher
start := 250 * time.Millisecond
for i := 0; i < 5; i++ {
time.Sleep(start)
command = []string{"label", "-n", app.Spec.TargetNamespace, "--overwrite", "-f", file.Name(), fmt.Sprintf("%s=%s", appLabel, app.Name)}
cmd = exec.Command(kubectl, command...)
cmd.Env = []string{fmt.Sprintf("%s=%s", kcEnv, kubeconfig)}
buf := &bytes.Buffer{}
cmd.Stdout = os.Stdout
cmd.Stderr = buf
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
if i == 4 {
logrus.Warnf("tried 4 times and kubectl label failed. Error: %s", buf.String())
break
}
start = start * 2
continue
}
break
}
return nil
}
func kubectlDelete(template, kubeconfig, namespace string) error {
file, err := ioutil.TempFile("", "app-template")
if err != nil {
return err
}
defer os.RemoveAll(file.Name())
if err := ioutil.WriteFile(file.Name(), []byte(template), 0755); err != nil {
return err
}
command := []string{"delete", "--all", "-n", namespace, "-f", file.Name()}
// try three times and succeed
start := time.Second * 1
for i := 0; i < 3; i++ {
cmd := exec.Command(kubectl, command...)
cmd.Env = []string{fmt.Sprintf("%s=%s", kcEnv, kubeconfig)}
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
time.Sleep(start)
start = start * 2
continue
}
break
}
return nil
}
func convertTemplates(files map[string]string, templateContentClient mgmtv3.TemplateContentInterface) (map[string]string, error) {
templates := map[string]string{}
for name, tag := range files {
data, err := templatecontent.GetTemplateFromTag(tag, templateContentClient)
if err != nil {
continue
}
templates[name] = data
}
return templates, nil
}
func generateTemplates(obj *v3.App, templateVersionClient mgmtv3.TemplateVersionInterface, templateContentClient mgmtv3.TemplateContentInterface) (string, string, *common.HelmPath, error) {
files := map[string]string{}
if obj.Spec.ExternalID != "" {
templateVersionID, err := common.ParseExternalID(obj.Spec.ExternalID)
if err != nil {
return "", "", nil, err
}
templateVersion, err := templateVersionClient.Get(templateVersionID, metav1.GetOptions{})
if err != nil {
return "", "", nil, err
}
files, err = convertTemplates(templateVersion.Spec.Files, templateContentClient)
if err != nil {
return "", "", nil, err
}
} else {
for k, v := range obj.Spec.Files {
content, err := base64.StdEncoding.DecodeString(v)
if err != nil {
return "", "", nil, err
}
files[k] = string(content)
}
}
tempDirs, err := createTempDir(obj)
if err != nil {
return "", "", nil, err
}
err = WriteTempDir(tempDirs, files)
if err != nil {
return "", "", nil, err
}
setValues := []string{}
if obj.Spec.Answers != nil {
answers := obj.Spec.Answers
result := []string{}
for k, v := range answers {
result = append(result, fmt.Sprintf("%s=%s", k, v))
}
setValues = append([]string{"--set"}, strings.Join(result, ","))
}
commands := append([]string{"template", tempDirs.AppDirInJail, "--name", obj.Name, "--namespace", obj.Spec.TargetNamespace}, setValues...)
cmd := exec.Command(helmName, commands...)
sbOut := &bytes.Buffer{}
sbErr := &bytes.Buffer{}
cmd.Stdout = sbOut
cmd.Stderr = sbErr
cmd, err = common.JailCommand(cmd, tempDirs.FullPath)
if err != nil {
return "", "", nil, err
}
if err := cmd.Start(); err != nil {
return "", "", nil, errors.Wrapf(err, "helm template failed. %s", filterErrorMessage(sbErr.String(), tempDirs.AppDirInJail, "template-dir"))
}
if err := cmd.Wait(); err != nil {
return "", "", nil, errors.Wrapf(err, "helm template failed. %s", filterErrorMessage(sbErr.String(), tempDirs.AppDirInJail, "template-dir"))
}
// notes.txt
commands = append([]string{"template", tempDirs.AppDirInJail, "--name", obj.Name, "--namespace", obj.Spec.TargetNamespace, "--notes"}, setValues...)
cmd = exec.Command(helmName, commands...)
noteOut := &bytes.Buffer{}
sbErr = &bytes.Buffer{}
cmd.Stdout = noteOut
cmd.Stderr = sbErr
cmd, err = common.JailCommand(cmd, tempDirs.FullPath)
if err != nil {
return "", "", nil, err
}
if err := cmd.Start(); err != nil {
return "", "", nil, errors.Wrapf(err, "helm template --notes failed. %s", filterErrorMessage(sbErr.String(), tempDirs.AppDirInJail, "template-dir"))
}
if err := cmd.Wait(); err != nil {
return "", "", nil, errors.Wrapf(err, "helm template --notes failed. %s", filterErrorMessage(sbErr.String(), tempDirs.AppDirInJail, "template-dir"))
}
template := sbOut.String()
notes := noteOut.String()
return template, notes, tempDirs, nil
}
// filter error message, replace old with new
func filterErrorMessage(msg, old, new string) string {
return strings.Replace(msg, old, new, -1)
}
func createTempDir(obj *v3.App) (*common.HelmPath, error) {
if os.Getenv("CATTLE_DEV_MODE") != "" {
dir, err := ioutil.TempDir("", "helm-")
if err != nil {
return nil, err
}
return &common.HelmPath{
FullPath: dir,
InJailPath: dir,
KubeConfigFull: filepath.Join(dir, ".kubeconfig"),
KubeConfigInJail: filepath.Join(dir, ".kubeconfig"),
}, nil
}
err := jailer.CreateJail(obj.Name)
if err != nil {
return nil, err
}
paths := &common.HelmPath{
FullPath: filepath.Join(jailer.BaseJailPath, obj.Name),
InJailPath: "/",
KubeConfigFull: filepath.Join(jailer.BaseJailPath, obj.Name, ".kubeconfig"),
KubeConfigInJail: "/.kubeconfig",
}
return paths, nil
}