restic/cmd/khepri/cmd_backup.go
2014-07-28 20:21:19 +02:00

99 lines
1.7 KiB
Go

package main
import (
"bytes"
"crypto/sha256"
"errors"
"fmt"
"io"
"log"
"os"
"path/filepath"
"github.com/fd0/khepri"
)
func hash(filename string) (khepri.ID, error) {
h := sha256.New()
f, err := os.Open(filename)
if err != nil {
return nil, err
}
io.Copy(h, f)
return h.Sum([]byte{}), nil
}
func archive_dir(repo *khepri.DirRepository, path string) (khepri.ID, error) {
log.Printf("archiving dir %q", path)
dir, err := os.Open(path)
if err != nil {
log.Printf("open(%q): %v\n", path, err)
return nil, err
}
entries, err := dir.Readdir(-1)
if err != nil {
log.Printf("readdir(%q): %v\n", path, err)
return nil, err
}
// use nil ID for empty directories
if len(entries) == 0 {
return nil, nil
}
t := khepri.NewTree()
for _, e := range entries {
node := khepri.NodeFromFileInfo(e)
var id khepri.ID
var err error
if e.IsDir() {
id, err = archive_dir(repo, filepath.Join(path, e.Name()))
} else {
id, err = repo.PutFile(filepath.Join(path, e.Name()))
}
node.Content = id
t.Nodes = append(t.Nodes, node)
if err != nil {
log.Printf(" error storing %q: %v\n", e.Name(), err)
continue
}
}
log.Printf(" dir %q: %v entries", path, len(t.Nodes))
var buf bytes.Buffer
t.Save(&buf)
id, err := repo.PutRaw(buf.Bytes())
if err != nil {
log.Printf("error saving tree to repo: %v", err)
}
log.Printf("tree for %q saved at %s", path, id)
return id, nil
}
func commandBackup(repo *khepri.DirRepository, args []string) error {
if len(args) != 1 {
return errors.New("usage: backup dir")
}
target := args[0]
id, err := archive_dir(repo, target)
if err != nil {
return err
}
fmt.Printf("%q archived as %v\n", target, id)
return nil
}