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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package build
import (
"archive/tar"
"archive/zip"
"compress/gzip"
"fmt"
"io"
"os"
"path/filepath"
"strings"
)
type Archive interface {
// Directory adds a new directory entry to the archive and sets the
// directory for subsequent calls to Header.
Directory(name string) error
// Header adds a new file to the archive. The file is added to the directory
// set by Directory. The content of the file must be written to the returned
// writer.
Header(os.FileInfo) (io.Writer, error)
// Close flushes the archive and closes the underlying file.
Close() error
}
func NewArchive(file *os.File) (Archive, string) {
switch {
case strings.HasSuffix(file.Name(), ".zip"):
return NewZipArchive(file), strings.TrimSuffix(file.Name(), ".zip")
case strings.HasSuffix(file.Name(), ".tar.gz"):
return NewTarballArchive(file), strings.TrimSuffix(file.Name(), ".tar.gz")
default:
return nil, ""
}
}
// AddFile appends an existing file to an archive.
func AddFile(a Archive, file string) error {
fd, err := os.Open(file)
if err != nil {
return err
}
defer fd.Close()
fi, err := fd.Stat()
if err != nil {
return err
}
w, err := a.Header(fi)
if err != nil {
return err
}
if _, err := io.Copy(w, fd); err != nil {
return err
}
return nil
}
// WriteArchive creates an archive containing the given files.
func WriteArchive(name string, files []string) (err error) {
archfd, err := os.Create(name)
if err != nil {
return err
}
defer func() {
archfd.Close()
// Remove the half-written archive on failure.
if err != nil {
os.Remove(name)
}
}()
archive, basename := NewArchive(archfd)
if archive == nil {
return fmt.Errorf("unknown archive extension")
}
fmt.Println(name)
if err := archive.Directory(basename); err != nil {
return err
}
for _, file := range files {
fmt.Println(" +", filepath.Base(file))
if err := AddFile(archive, file); err != nil {
return err
}
}
return archive.Close()
}
type ZipArchive struct {
dir string
zipw *zip.Writer
file io.Closer
}
func NewZipArchive(w io.WriteCloser) Archive {
return &ZipArchive{"", zip.NewWriter(w), w}
}
func (a *ZipArchive) Directory(name string) error {
a.dir = name + "/"
return nil
}
func (a *ZipArchive) Header(fi os.FileInfo) (io.Writer, error) {
head, err := zip.FileInfoHeader(fi)
if err != nil {
return nil, fmt.Errorf("can't make zip header: %v", err)
}
head.Name = a.dir + head.Name
head.Method = zip.Deflate
w, err := a.zipw.CreateHeader(head)
if err != nil {
return nil, fmt.Errorf("can't add zip header: %v", err)
}
return w, nil
}
func (a *ZipArchive) Close() error {
if err := a.zipw.Close(); err != nil {
return err
}
return a.file.Close()
}
type TarballArchive struct {
dir string
tarw *tar.Writer
gzw *gzip.Writer
file io.Closer
}
func NewTarballArchive(w io.WriteCloser) Archive {
gzw := gzip.NewWriter(w)
tarw := tar.NewWriter(gzw)
return &TarballArchive{"", tarw, gzw, w}
}
func (a *TarballArchive) Directory(name string) error {
a.dir = name + "/"
return a.tarw.WriteHeader(&tar.Header{
Name: a.dir,
Mode: 0755,
Typeflag: tar.TypeDir,
})
}
func (a *TarballArchive) Header(fi os.FileInfo) (io.Writer, error) {
head, err := tar.FileInfoHeader(fi, "")
if err != nil {
return nil, fmt.Errorf("can't make tar header: %v", err)
}
head.Name = a.dir + head.Name
if err := a.tarw.WriteHeader(head); err != nil {
return nil, fmt.Errorf("can't add tar header: %v", err)
}
return a.tarw, nil
}
func (a *TarballArchive) Close() error {
if err := a.tarw.Close(); err != nil {
return err
}
if err := a.gzw.Close(); err != nil {
return err
}
return a.file.Close()
}
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