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backup_keys.go
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backup_keys.go
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package cmd
import (
"archive/tar"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/charmbracelet/charm/client"
"github.com/spf13/cobra"
)
var backupOutputFile string
func init() {
BackupKeysCmd.Flags().StringVarP(&backupOutputFile, "output", "o", "charm-keys-backup.tar", "keys backup filepath")
}
// BackupKeysCmd is the cobra.Command to back up a user's account SSH keys.
var BackupKeysCmd = &cobra.Command{
Use: "backup-keys",
Hidden: false,
Short: "Backup your Charm account keys",
Long: paragraph(fmt.Sprintf("%s your Charm account keys to a tar archive file. \nYou can restore your keys from backup using import-keys. \nRun `charm import-keys -help` to learn more.", keyword("Backup"))),
Args: cobra.NoArgs,
DisableFlagsInUseLine: true,
RunE: func(cmd *cobra.Command, args []string) error {
cfg, err := client.ConfigFromEnv()
if err != nil {
return err
}
cc, err := client.NewClient(cfg)
if err != nil {
return err
}
dd, err := cc.DataPath()
if err != nil {
return err
}
if err := validateDirectory(dd); err != nil {
return err
}
backupPath := backupOutputFile
if backupPath == "-" {
exp := regexp.MustCompilePOSIX("charm_(rsa|ed25519)$")
paths, err := getKeyPaths(dd, exp)
if err != nil {
return err
}
if len(paths) != 1 {
return fmt.Errorf("backup to stdout only works with 1 key, you have %d", len(paths))
}
bts, err := os.ReadFile(paths[0])
if err != nil {
return err
}
_, _ = fmt.Fprint(cmd.OutOrStdout(), string(bts))
return nil
}
if !strings.HasSuffix(backupPath, ".tar") {
backupPath = backupPath + ".tar"
}
if fileOrDirectoryExists(backupPath) {
fmt.Printf("Not creating backup file: %s already exists.\n\n", code(backupPath))
os.Exit(1)
}
if err := os.MkdirAll(filepath.Dir(backupPath), 0o754); err != nil {
return err
}
if err := createTar(dd, backupPath); err != nil {
return err
}
fmt.Printf("Done! Saved keys to %s.\n\n", code(backupPath))
return nil
},
}
func fileOrDirectoryExists(path string) bool {
if _, err := os.Stat(path); os.IsNotExist(err) {
return false
}
return true
}
func validateDirectory(path string) error {
info, err := os.Stat(path)
if err == nil {
if !info.IsDir() {
return fmt.Errorf("%v is not a directory, but it should be", path)
}
files, err := os.ReadDir(path)
if err != nil {
return err
}
foundKeys := 0
keyPattern := regexp.MustCompile(`charm_(rsa|ed25519)(\.pub)?`)
for _, f := range files {
if !f.IsDir() && keyPattern.MatchString(f.Name()) {
foundKeys++
}
}
if foundKeys < 2 {
return fmt.Errorf("we didn’t find any keys to backup in %s", path)
}
// Everything looks OK!
return nil
} else if os.IsNotExist(err) {
return fmt.Errorf("'%v' does not exist", path)
} else {
return err
}
}
func createTar(source string, target string) error {
tarfile, err := os.Create(target)
if err != nil {
return err
}
defer tarfile.Close() // nolint:errcheck
tarball := tar.NewWriter(tarfile)
defer tarball.Close() // nolint:errcheck
info, err := os.Stat(source)
if err != nil {
return nil
}
var baseDir string
if info.IsDir() {
baseDir = filepath.Base(source)
}
exp := regexp.MustCompilePOSIX("charm_(rsa|ed25519)(.pub)?$")
paths, err := getKeyPaths(source, exp)
if err != nil {
return err
}
for _, path := range paths {
info, err := os.Stat(path)
if err != nil {
return err
}
header, err := tar.FileInfoHeader(info, info.Name())
if err != nil {
return err
}
if baseDir != "" {
header.Name = filepath.Join(baseDir, strings.TrimPrefix(path, source))
}
if err := tarball.WriteHeader(header); err != nil {
return err
}
if info.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close() // nolint:errcheck
if _, err := io.Copy(tarball, file); err != nil {
return err
}
if err := file.Close(); err != nil {
return err
}
}
if err := tarball.Close(); err != nil {
return err
}
return tarfile.Close()
}
func getKeyPaths(source string, filter *regexp.Regexp) ([]string, error) {
var result []string
err := filepath.Walk(source, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if filter.MatchString(path) {
result = append(result, path)
}
return nil
})
return result, err
}