65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"github.com/Microsoft/hcsshim/ext4/tar2ext4"
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)
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var (
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input = flag.String("i", "", "input file")
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output = flag.String("o", "", "output file")
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overlay = flag.Bool("overlay", false, "produce overlayfs-compatible layer image")
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vhd = flag.Bool("vhd", false, "add a VHD footer to the end of the image")
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inlineData = flag.Bool("inline", false, "write small file data into the inode; not compatible with DAX")
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)
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func main() {
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flag.Parse()
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if flag.NArg() != 0 || len(*output) == 0 {
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flag.Usage()
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os.Exit(1)
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}
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err := func() (err error) {
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in := os.Stdin
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if *input != "" {
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in, err = os.Open(*input)
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if err != nil {
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return err
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}
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}
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out, err := os.Create(*output)
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if err != nil {
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return err
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}
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var opts []tar2ext4.Option
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if *overlay {
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opts = append(opts, tar2ext4.ConvertWhiteout)
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}
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if *vhd {
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opts = append(opts, tar2ext4.AppendVhdFooter)
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}
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if *inlineData {
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opts = append(opts, tar2ext4.InlineData)
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}
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err = tar2ext4.Convert(in, out, opts...)
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if err != nil {
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return err
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}
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// Exhaust the tar stream.
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io.Copy(ioutil.Discard, in)
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return nil
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}()
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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