cloudflared-mirror/cmd/cloudflared/service_template.go

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package main
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"text/template"
"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
"github.com/mitchellh/go-homedir"
)
type ServiceTemplate struct {
Path string
Content string
FileMode os.FileMode
}
type ServiceTemplateArgs struct {
Path string
}
func (st *ServiceTemplate) ResolvePath() (string, error) {
resolvedPath, err := homedir.Expand(st.Path)
if err != nil {
return "", fmt.Errorf("error resolving path %s: %v", st.Path, err)
}
return resolvedPath, nil
}
func (st *ServiceTemplate) Generate(args *ServiceTemplateArgs) error {
tmpl, err := template.New(st.Path).Parse(st.Content)
if err != nil {
return fmt.Errorf("error generating %s template: %v", st.Path, err)
}
resolvedPath, err := st.ResolvePath()
if err != nil {
return err
}
var buffer bytes.Buffer
err = tmpl.Execute(&buffer, args)
if err != nil {
return fmt.Errorf("error generating %s: %v", st.Path, err)
}
fileMode := os.FileMode(0644)
if st.FileMode != 0 {
fileMode = st.FileMode
}
err = ioutil.WriteFile(resolvedPath, buffer.Bytes(), fileMode)
if err != nil {
return fmt.Errorf("error writing %s: %v", resolvedPath, err)
}
return nil
}
func (st *ServiceTemplate) Remove() error {
resolvedPath, err := st.ResolvePath()
if err != nil {
return err
}
err = os.Remove(resolvedPath)
if err != nil {
return fmt.Errorf("error deleting %s: %v", resolvedPath, err)
}
return nil
}
func runCommand(command string, args ...string) error {
cmd := exec.Command(command, args...)
stderr, err := cmd.StderrPipe()
if err != nil {
logger.WithError(err).Infof("error getting stderr pipe")
return fmt.Errorf("error getting stderr pipe: %v", err)
}
err = cmd.Start()
if err != nil {
logger.WithError(err).Infof("error starting %s", command)
return fmt.Errorf("error starting %s: %v", command, err)
}
commandErr, _ := ioutil.ReadAll(stderr)
if len(commandErr) > 0 {
logger.Errorf("%s: %s", command, commandErr)
}
err = cmd.Wait()
if err != nil {
logger.WithError(err).Infof("%s returned error", command)
return fmt.Errorf("%s returned with error: %v", command, err)
}
return nil
}
func ensureConfigDirExists(configDir string) error {
ok, err := config.FileExists(configDir)
if !ok && err == nil {
err = os.Mkdir(configDir, 0755)
}
return err
}
// openFile opens the file at path. If create is set and the file exists, returns nil, true, nil
func openFile(path string, create bool) (file *os.File, exists bool, err error) {
expandedPath, err := homedir.Expand(path)
if err != nil {
return nil, false, err
}
if create {
fileInfo, err := os.Stat(expandedPath)
if err == nil && fileInfo.Size() > 0 {
return nil, true, nil
}
file, err = os.OpenFile(expandedPath, os.O_RDWR|os.O_CREATE, 0600)
} else {
file, err = os.Open(expandedPath)
}
return file, false, err
}
func copyCredential(srcCredentialPath, destCredentialPath string) error {
destFile, exists, err := openFile(destCredentialPath, true)
if err != nil {
return err
} else if exists {
// credentials already exist, do nothing
return nil
}
defer destFile.Close()
srcFile, _, err := openFile(srcCredentialPath, false)
if err != nil {
return err
}
defer srcFile.Close()
// Copy certificate
_, err = io.Copy(destFile, srcFile)
if err != nil {
return fmt.Errorf("unable to copy %s to %s: %v", srcCredentialPath, destCredentialPath, err)
}
return nil
}
func copyConfig(srcConfigPath, destConfigPath string) error {
// Copy or create config
destFile, exists, err := openFile(destConfigPath, true)
if err != nil {
logger.WithError(err).Infof("cannot open %s", destConfigPath)
return err
} else if exists {
// config already exists, do nothing
return nil
}
defer destFile.Close()
srcFile, _, err := openFile(srcConfigPath, false)
if err != nil {
fmt.Println("Your service needs a config file that at least specifies the hostname option.")
fmt.Println("Type in a hostname now, or leave it blank and create the config file later.")
fmt.Print("Hostname: ")
reader := bufio.NewReader(os.Stdin)
input, _ := reader.ReadString('\n')
if input == "" {
return err
}
fmt.Fprintf(destFile, "hostname: %s\n", input)
} else {
defer srcFile.Close()
_, err = io.Copy(destFile, srcFile)
if err != nil {
return fmt.Errorf("unable to copy %s to %s: %v", srcConfigPath, destConfigPath, err)
}
logger.Infof("Copied %s to %s", srcConfigPath, destConfigPath)
}
return nil
}