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common.go
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common.go
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package common
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"math/rand"
"net"
"net/url"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"github.com/pkg/errors"
"github.com/rancher/rancher/pkg/jailer"
"github.com/rancher/rancher/pkg/namespace"
v3 "github.com/rancher/types/apis/project.cattle.io/v3"
"github.com/sirupsen/logrus"
)
const (
base = 32768
end = 61000
tillerName = "tiller"
helmName = "helm"
forceUpgradeStr = "--force"
)
type HelmPath struct {
// /opt/jail/<app-name>
FullPath string
// /
InJailPath string
// /opt/jail/<app-name>/.kubeconfig
KubeConfigFull string
// /.kubeconfig
KubeConfigInJail string
// /opt/jail/<app-name>/<app-sub>
AppDirFull string
// /<app-sub>
AppDirInJail string
}
func ParseExternalID(externalID string) (string, string, error) {
templateVersionNamespace, catalog, _, template, version, err := SplitExternalID(externalID)
if err != nil {
return "", "", err
}
return strings.Join([]string{catalog, template, version}, "-"), templateVersionNamespace, nil
}
func SplitExternalID(externalID string) (string, string, string, string, string, error) {
var templateVersionNamespace, catalog string
values, err := url.Parse(externalID)
if err != nil {
return "", "", "", "", "", err
}
catalogWithNamespace := values.Query().Get("catalog")
catalogType := values.Query().Get("type")
template := values.Query().Get("template")
version := values.Query().Get("version")
split := strings.SplitN(catalogWithNamespace, "/", 2)
if len(split) == 2 {
templateVersionNamespace = split[0]
catalog = split[1]
}
//pre-upgrade setups will have global catalogs, where externalId field on templateversions won't have namespace.
// since these are global catalogs, we can default to global namespace
if templateVersionNamespace == "" {
templateVersionNamespace = namespace.GlobalNamespace
catalog = catalogWithNamespace
}
return templateVersionNamespace, catalog, catalogType, template, version, nil
}
// StartTiller start tiller server and return the listening address of the grpc address
func StartTiller(context context.Context, tempDirs *HelmPath, port, namespace string) error {
probePort := GenerateRandomPort()
cmd := exec.Command(tillerName, "--listen", ":"+port, "--probe", ":"+probePort)
cmd.Env = []string{fmt.Sprintf("%s=%s", "KUBECONFIG", tempDirs.KubeConfigInJail), fmt.Sprintf("%s=%s", "TILLER_NAMESPACE", namespace), fmt.Sprintf("%s=%s", "TILLER_HISTORY_MAX", "1")}
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd, err := JailCommand(cmd, tempDirs.FullPath)
if err != nil {
return err
}
if err := cmd.Start(); err != nil {
return err
}
defer cmd.Wait()
select {
case <-context.Done():
logrus.Debug("Stopping Tiller")
return cmd.Process.Kill()
}
}
func GenerateRandomPort() string {
s1 := rand.NewSource(time.Now().UnixNano())
r1 := rand.New(s1)
for {
port := base + r1.Intn(end-base+1)
ln, err := net.Listen("tcp", ":"+strconv.Itoa(port))
if err != nil {
continue
}
ln.Close()
return strconv.Itoa(port)
}
}
func InstallCharts(tempDirs *HelmPath, port string, obj *v3.App) error {
logrus.Debugf("InstallCharts - helm path info %+v\n", tempDirs)
extraArgs := GetExtraArgs(obj)
setValues, err := GenerateAnswerSetValues(obj, tempDirs, extraArgs)
if err != nil {
return err
}
commands := make([]string, 0)
commands = append([]string{"upgrade", "--install", "--namespace", obj.Spec.TargetNamespace, obj.Name}, setValues...)
commands = append(commands, tempDirs.AppDirInJail)
if v3.AppConditionForceUpgrade.IsUnknown(obj) {
commands = append(commands, forceUpgradeStr)
// don't leave force recreate on the object
v3.AppConditionForceUpgrade.True(obj)
}
// switch userTriggeredAction back
v3.AppConditionUserTriggeredAction.Unknown(obj)
cmd := exec.Command(helmName, commands...)
cmd.Env = []string{fmt.Sprintf("%s=%s", "HELM_HOST", "127.0.0.1:"+port)}
stderrBuf := &bytes.Buffer{}
cmd.Stdout = os.Stdout
cmd.Stderr = stderrBuf
cmd, err = JailCommand(cmd, tempDirs.FullPath)
if err != nil {
return err
}
if err := cmd.Start(); err != nil {
return errors.Errorf("failed to install app %s. %s", obj.Name, stderrBuf.String())
}
if err := cmd.Wait(); err != nil {
// if the first install failed, the second install would have error message like `has no deployed releases`, then the
// original error is masked. We need to filter out the message and always return the last one if error matches this pattern
if strings.Contains(stderrBuf.String(), "has no deployed releases") {
if !v3.AppConditionForceUpgrade.IsUnknown(obj) {
v3.AppConditionForceUpgrade.Unknown(obj)
}
return errors.New(v3.AppConditionInstalled.GetMessage(obj))
}
return errors.Errorf("failed to install app %s. %s", obj.Name, stderrBuf.String())
}
return nil
}
func GenerateAnswerSetValues(app *v3.App, tempDir *HelmPath, extraArgs map[string]string) ([]string, error) {
setValues := []string{}
// a user-supplied values file will overridden default values.yaml
if app.Spec.ValuesYaml != "" {
custom := "custom-values.yaml"
valuesYaml := filepath.Join(tempDir.FullPath, custom)
if err := ioutil.WriteFile(valuesYaml, []byte(app.Spec.ValuesYaml), 0755); err != nil {
return setValues, err
}
setValues = append(setValues, "--values", filepath.Join(tempDir.InJailPath, custom))
}
// `--set` values will overridden the user-supplied values.yaml file
if app.Spec.Answers != nil || extraArgs != nil {
answers := app.Spec.Answers
var values = []string{}
for k, v := range answers {
if _, ok := extraArgs[k]; ok {
continue
}
values = append(values, fmt.Sprintf("%s=%s", k, v))
}
for k, v := range extraArgs {
values = append(values, fmt.Sprintf("%s=%s", k, v))
}
setValues = append(setValues, "--set", strings.Join(values, ","))
}
return setValues, nil
}
func DeleteCharts(tempDirs *HelmPath, port string, obj *v3.App) error {
cmd := exec.Command(helmName, "delete", "--purge", obj.Name)
cmd.Env = []string{fmt.Sprintf("%s=%s", "HELM_HOST", "127.0.0.1:"+port)}
cmd, err := JailCommand(cmd, tempDirs.FullPath)
if err != nil {
return err
}
combinedOutput, err := cmd.CombinedOutput()
if err != nil && combinedOutput != nil && strings.Contains(string(combinedOutput), fmt.Sprintf("Error: release: \"%s\" not found", obj.Name)) {
return nil
}
return errors.New(string(combinedOutput))
}
func JailCommand(cmd *exec.Cmd, jailPath string) (*exec.Cmd, error) {
if os.Getenv("CATTLE_DEV_MODE") != "" {
return cmd, nil
}
cred, err := jailer.GetUserCred()
if err != nil {
return nil, errors.WithMessage(err, "get user cred error")
}
cmd.SysProcAttr = &syscall.SysProcAttr{}
cmd.SysProcAttr.Credential = cred
cmd.SysProcAttr.Chroot = jailPath
return cmd, nil
}