1 package main
2
3 import (
4 "flag"
5 "fmt"
6 "io"
7 "os"
8
9 "github.com/Microsoft/hcsshim/ext4/tar2ext4"
10 )
11
12 var (
13 input = flag.String("i", "", "input file")
14 output = flag.String("o", "", "output file")
15 overlay = flag.Bool("overlay", false, "produce overlayfs-compatible layer image")
16 vhd = flag.Bool("vhd", false, "add a VHD footer to the end of the image")
17 inlineData = flag.Bool("inline", false, "write small file data into the inode; not compatible with DAX")
18 )
19
20 func main() {
21 flag.Parse()
22 if flag.NArg() != 0 || len(*output) == 0 {
23 flag.Usage()
24 os.Exit(1)
25 }
26
27 err := func() (err error) {
28 in := os.Stdin
29 if *input != "" {
30 in, err = os.Open(*input)
31 if err != nil {
32 return err
33 }
34 }
35 out, err := os.Create(*output)
36 if err != nil {
37 return err
38 }
39
40 var opts []tar2ext4.Option
41 if *overlay {
42 opts = append(opts, tar2ext4.ConvertWhiteout)
43 }
44 if *vhd {
45 opts = append(opts, tar2ext4.AppendVhdFooter)
46 }
47 if *inlineData {
48 opts = append(opts, tar2ext4.InlineData)
49 }
50 err = tar2ext4.Convert(in, out, opts...)
51 if err != nil {
52 return err
53 }
54
55
56 _, _ = io.Copy(io.Discard, in)
57 return nil
58 }()
59 if err != nil {
60 fmt.Fprintln(os.Stderr, err)
61 os.Exit(1)
62 }
63 }
64
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