package cmdlxcconfig import ( "errors" "fmt" "io" "os" goflags "github.com/jessevdk/go-flags" "github.com/motiejus/code/undocker/lxcconfig" ) const _description = "Create an LXC-compatible container configuration" type ( // Command is an implementation of go-flags.Command Command struct { configer func(io.ReadSeeker, io.Writer) error Stdout io.Writer PositionalArgs struct { Infile goflags.Filename `long:"infile" description:"Input tarball"` Outfile string `long:"outfile" description:"Output path, stdout is '-'"` } `positional-args:"yes" required:"yes"` } ) func NewCommand() *Command { return &Command{ configer: lxcconfig.LXCConfig, Stdout: os.Stdout, } } func (*Command) ShortDesc() string { return _description } func (*Command) LongDesc() string { return _description } // Execute executes lxcconfig Command func (c *Command) Execute(args []string) (err error) { if len(args) != 0 { return errors.New("too many args") } rd, err := os.Open(string(c.PositionalArgs.Infile)) if err != nil { return err } defer func() { err1 := rd.Close() if err == nil { err = err1 } }() var out io.Writer outf := string(c.PositionalArgs.Outfile) if fname := string(c.PositionalArgs.Outfile); fname == "-" { out = c.Stdout } else { outf, err := os.Create(outf) if err != nil { return fmt.Errorf("create: %w", err) } defer func() { err1 := outf.Close() if err == nil { err = err1 } }() out = outf } return c.configer(rd, out) }