69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
package main
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import (
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"errors"
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"os"
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goflags "github.com/jessevdk/go-flags"
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"github.com/motiejus/code/undocker/rootfs"
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"go.uber.org/multierr"
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)
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type (
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params struct {
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RootFS cmdRootFS `command:"rootfs" description:"Unpack a docker container image to a single filesystem tarball"`
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Manifest cmdManifest `command:"manifest"`
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}
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cmdManifest struct{} // stub
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)
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func main() {
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if err := run(os.Args); err != nil {
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os.Exit(1)
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}
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os.Exit(0)
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}
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func run(args []string) error {
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var opts params
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if _, err := goflags.ParseArgs(&opts, args[1:]); err != nil {
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return err
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}
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return nil
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}
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type cmdRootFS struct {
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PositionalArgs struct {
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Infile goflags.Filename `long:"infile" description:"Input tarball"`
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Outfile string `long:"outfile" description:"Output path, stdout is '-'"`
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} `positional-args:"yes" required:"yes"`
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}
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func (r *cmdRootFS) Execute(args []string) (err error) {
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if len(args) != 0 {
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return errors.New("too many args")
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}
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in, err := os.Open(string(r.PositionalArgs.Infile))
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if err != nil {
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return err
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}
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defer func() { err = multierr.Append(err, in.Close()) }()
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var out *os.File
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outf := string(r.PositionalArgs.Outfile)
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if outf == "-" {
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out = os.Stdout
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} else {
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out, err = os.Create(outf)
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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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defer func() { err = multierr.Append(err, out.Close()) }()
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return rootfs.RootFS(in, out)
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}
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