67 lines
1.2 KiB
Go
67 lines
1.2 KiB
Go
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// Package backup generates tarballs of /perm.
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package backup
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import (
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"archive/tar"
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"compress/gzip"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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)
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func Archive(w io.Writer, dir string) error {
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gw, err := gzip.NewWriterLevel(w, gzip.BestSpeed)
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if err != nil {
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return err
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}
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defer gw.Close()
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tw := tar.NewWriter(gw)
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err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if info == nil {
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return fmt.Errorf("filepath.Walk: nil os.FileInfo")
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}
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if !info.Mode().IsRegular() && !info.Mode().IsDir() {
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return nil // skip non-regular files/directories
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}
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if path == dir {
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return nil // skip root
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}
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rel, err := filepath.Rel(dir, path)
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if err != nil {
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return err
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}
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hdr, err := tar.FileInfoHeader(info, "")
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if err != nil {
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return err
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}
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hdr.Name = rel
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if err := tw.WriteHeader(hdr); err != nil {
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return err
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}
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if !info.Mode().IsDir() {
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b, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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if _, err := tw.Write(b); err != nil {
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return err
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}
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}
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return nil
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})
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if err != nil {
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return err
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}
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if err := tw.Close(); err != nil {
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return err
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}
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return gw.Close()
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}
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