undocker/main.go

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