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tar.go
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package tar
import (
"archive/tar"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/erikh/box/builder/signal"
"github.com/erikh/box/copy"
)
func archiveSingle(rel, target string, tw *tar.Writer) error {
fi, err := os.Lstat(rel)
if err != nil {
return err
}
header, err := tar.FileInfoHeader(fi, target)
if err != nil {
return err
}
header.Name = target
header.Linkname = target
if err := tw.WriteHeader(header); err != nil {
return err
}
p, err := os.Open(rel)
if err != nil {
return err
}
defer p.Close()
return copy.WithProgress(tw, p, fmt.Sprintf("Writing %s", rel))
}
func archiveWalk(rel, target string, tw *tar.Writer) filepath.WalkFunc {
return func(path string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
header, err := tar.FileInfoHeader(fi, path)
if err != nil {
return err
}
if !(header.Typeflag == tar.TypeReg || header.Typeflag == tar.TypeSymlink) {
return nil
}
realpath, err := filepath.EvalSymlinks(path)
if err != nil {
return err
}
relpath, err := filepath.Rel(rel, path)
if err != nil {
return err
}
realpath, err = filepath.Rel(rel, realpath)
if err != nil {
return err
}
header.Linkname = filepath.Join(target, relpath)
header.Name = filepath.Join(target, realpath)
if err := tw.WriteHeader(header); err != nil {
return err
}
if header.Typeflag == tar.TypeReg {
p, err := os.Open(path)
if err != nil {
return err
}
err = copy.WithProgress(tw, p, fmt.Sprintf("Writing %s", path))
if err != nil && err != io.EOF {
p.Close()
return err
}
p.Close()
}
return nil
}
}
// Archive takes a source and target directory and returns a filename and/or
// error. The source will be archived relative to the target. The file will
// live in the user's os.TempDir().
func Archive(rel, target string) (string, error) {
fi, err := os.Lstat(rel)
if err != nil {
return "", err
}
f, err := ioutil.TempFile("", "box-copy.")
if err != nil {
return "", err
}
signal.SetSignal(func() { os.Remove(f.Name()) })
defer signal.SetSignal(nil)
tw := tar.NewWriter(f)
if fi.IsDir() {
if err := filepath.Walk(rel, archiveWalk(rel, target, tw)); err != nil {
return "", err
}
} else {
if err := archiveSingle(rel, target, tw); err != nil {
return "", err
}
}
tw.Close()
f.Close()
return f.Name(), nil
}
// SumFile reads a file an returns a hex-encoded sha512/256.
func SumFile(fn, fileType string) (string, error) {
f, err := os.Open(fn)
if err != nil {
return "", err
}
hash := sha256.New()
err = copy.WithProgress(hash, f, fmt.Sprintf("Summing %s", fileType))
if err != nil && err != io.EOF {
f.Close()
return "", err
}
f.Close()
return hex.EncodeToString(hash.Sum(nil)), nil
}