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/
extract.go
67 lines (59 loc) · 1.54 KB
/
extract.go
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package main
import (
"archive/tar"
"errors"
"fmt"
"io"
"os"
"syscall"
)
func makedev(major, minor int64) int {
return int(((major & 0xfff) << 8) | (minor & 0xff) | ((major &^ 0xfff) << 32) | ((minor & 0xfffff00) << 12))
}
func extractArchive() int {
archive := tar.NewReader(input)
for {
hdr, err := archive.Next()
if err == io.EOF {
break
}
if err != nil {
fmt.Fprintf(os.Stderr, "An error occured while reading archive: %v\n", err)
return 1
}
if verbose {
fmt.Fprintf(os.Stderr, "%s\n", hdr.Name)
}
switch hdr.Typeflag {
case tar.TypeReg, tar.TypeRegA:
var f *os.File
if f, err = os.OpenFile(hdr.Name, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, os.FileMode(hdr.Mode)); err == nil {
io.Copy(f, archive)
f.Close()
err = os.Chtimes(hdr.Name, hdr.ModTime, hdr.ModTime)
}
case tar.TypeDir:
err = os.Mkdir(hdr.Name, os.FileMode(hdr.Mode))
if err != nil {
patherr, ok := err.(*os.PathError)
if ok && patherr.Err == syscall.EEXIST {
err = nil
}
}
case tar.TypeSymlink:
err = os.Link(hdr.Name, hdr.Linkname)
case tar.TypeFifo:
err = syscall.Mkfifo(hdr.Name, uint32(hdr.Mode))
case tar.TypeChar:
err = errors.New("character devices unsupported")
err = syscall.Mknod(hdr.Name, syscall.S_IFCHR, makedev(hdr.Devmajor, hdr.Devminor))
case tar.TypeBlock:
err = errors.New("block devices unsupported")
err = syscall.Mknod(hdr.Name, syscall.S_IFBLK, makedev(hdr.Devmajor, hdr.Devminor))
}
if err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
}
}
return 0
}