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common.go
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common.go
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package common
import (
"bytes"
"context"
"fmt"
"math/rand"
"net"
"net/url"
"os"
"os/exec"
"strconv"
"strings"
"syscall"
"time"
"github.com/pkg/errors"
"github.com/rancher/rancher/pkg/jailer"
v3 "github.com/rancher/types/apis/project.cattle.io/v3"
"github.com/sirupsen/logrus"
)
const (
base = 32768
end = 61000
tillerName = "tiller"
helmName = "helm"
)
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, error) {
values, err := url.Parse(externalID)
if err != nil {
return "", err
}
catalog := values.Query().Get("catalog")
template := values.Query().Get("template")
version := values.Query().Get("version")
return strings.Join([]string{catalog, 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)}
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():
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)
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 := make([]string, 0)
commands = append([]string{"upgrade", "--install", "--namespace", obj.Spec.TargetNamespace, obj.Name}, setValues...)
commands = append(commands, tempDirs.AppDirInJail)
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") {
return errors.New(v3.AppConditionInstalled.GetMessage(obj))
}
return errors.Errorf("failed to install app %s. %s", obj.Name, stderrBuf.String())
}
return 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
}