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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package testing
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/sha256"
"fmt"
"io"
"os"
)
// TarFile represents a file to be archived.
type TarFile struct {
Header tar.Header
Contents string
}
var modes = map[os.FileMode]byte{
os.ModeDir: tar.TypeDir,
os.ModeSymlink: tar.TypeSymlink,
0: tar.TypeReg,
}
// NewTarFile returns a new TarFile instance with the given file
// mode and contents.
func NewTarFile(name string, mode os.FileMode, contents string) *TarFile {
ftype := modes[mode&os.ModeType]
if ftype == 0 {
panic(fmt.Errorf("unexpected mode %v", mode))
}
// NOTE: Do not set attributes (e.g. times) dynamically, as various
// tests expect the contents of fake tools archives to be unchanging.
return &TarFile{
Header: tar.Header{
Typeflag: ftype,
Name: name,
Size: int64(len(contents)),
Mode: int64(mode & 0777),
Uname: "ubuntu",
Gname: "ubuntu",
},
Contents: contents,
}
}
// TarGz returns the given files in gzipped tar-archive format, along with the sha256 checksum.
func TarGz(files ...*TarFile) ([]byte, string) {
var buf bytes.Buffer
sha256hash := sha256.New()
gzw := gzip.NewWriter(io.MultiWriter(&buf, sha256hash))
tarw := tar.NewWriter(gzw)
for _, f := range files {
err := tarw.WriteHeader(&f.Header)
if err != nil {
panic(err)
}
_, err = tarw.Write([]byte(f.Contents))
if err != nil {
panic(err)
}
}
err := tarw.Close()
if err != nil {
panic(err)
}
err = gzw.Close()
if err != nil {
panic(err)
}
checksum := fmt.Sprintf("%x", sha256hash.Sum(nil))
return buf.Bytes(), checksum
}
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