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tar.go
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tar.go
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package archivetest
import (
"archive/tar"
"bytes"
"fmt"
"io/fs"
"github.com/twpayne/chezmoi/v2/internal/chezmoimaps"
)
// NewTar returns the bytes of a new tar archive containing root.
func NewTar(root map[string]any) ([]byte, error) {
buffer := &bytes.Buffer{}
tarWriter := tar.NewWriter(buffer)
for _, key := range chezmoimaps.SortedKeys(root) {
if err := tarAddEntry(tarWriter, key, root[key]); err != nil {
return nil, err
}
}
if err := tarWriter.Close(); err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
func tarAddEntry(w *tar.Writer, name string, entry any) error {
switch entry := entry.(type) {
case []byte:
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeReg,
Name: name,
Size: int64(len(entry)),
Mode: 0o666,
}); err != nil {
return err
}
if _, err := w.Write(entry); err != nil {
return err
}
case map[string]any:
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeDir,
Name: name + "/",
Mode: int64(fs.ModePerm),
}); err != nil {
return err
}
for _, key := range chezmoimaps.SortedKeys(entry) {
if err := tarAddEntry(w, name+"/"+key, entry[key]); err != nil {
return err
}
}
case nil:
return nil
case string:
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeReg,
Name: name,
Size: int64(len(entry)),
Mode: 0o666,
}); err != nil {
return err
}
if _, err := w.Write([]byte(entry)); err != nil {
return err
}
case *Dir:
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeDir,
Name: name + "/",
Mode: int64(entry.Perm),
}); err != nil {
return err
}
for _, key := range chezmoimaps.SortedKeys(entry.Entries) {
if err := tarAddEntry(w, name+"/"+key, entry.Entries[key]); err != nil {
return err
}
}
case *File:
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeReg,
Name: name,
Size: int64(len(entry.Contents)),
Mode: int64(entry.Perm),
}); err != nil {
return err
}
if _, err := w.Write(entry.Contents); err != nil {
return err
}
case *Symlink:
if err := w.WriteHeader(&tar.Header{
Typeflag: tar.TypeSymlink,
Name: name,
Linkname: entry.Target,
}); err != nil {
return err
}
default:
return fmt.Errorf("%s: unsupported type: %T", name, entry)
}
return nil
}