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archivegen.go
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archivegen.go
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package main
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
"log"
"os"
"runtime"
"strings"
"text/tabwriter"
"github.com/multimfi/archivegen/archive"
"github.com/multimfi/archivegen/archive/cpio"
"github.com/multimfi/archivegen/archive/tar"
"github.com/multimfi/archivegen/config"
"github.com/multimfi/archivegen/tree"
)
var (
buildversion = "v0"
rootprefix string
)
func open(file *string) *os.File {
if file == nil {
return os.Stdout
}
r, err := os.OpenFile(
*file,
os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
0644,
)
if err != nil {
log.Fatal(err)
}
return r
}
func getTree(rootfs string, vars, files []string, stdin bool) *tree.Node {
var (
r *config.Map
err error
)
if stdin {
r = config.FromReaderRoot(rootfs, vars, os.Stdin)
} else {
r, err = config.FromFilesRoot(rootfs, vars, files...)
}
if err != nil {
log.Fatal(err)
}
if r == nil {
log.Fatal("nil map")
}
return tree.Render(r)
}
func printTree(t *tree.Node) {
tw := tabwriter.NewWriter(os.Stdout, 1, 1, 2, ' ', 0)
t.Print(rootprefix, tw)
tw.Flush()
}
func getArchive(fmt string, dst io.Writer, timestamp bool) archive.Writer {
switch fmt {
case "cpio":
return cpio.NewWriter(dst, timestamp)
case "tar":
return tar.NewWriter(dst, timestamp)
}
log.Fatal("unknown archive format", fmt)
return nil
}
func stdinPipe() bool {
f, err := os.Stdin.Stat()
if err != nil {
log.Fatal(err)
}
return (f.Mode() & os.ModeCharDevice) == 0
}
type varValue []string
func (v *varValue) String() string {
return ""
}
var errInvalidFlag = errors.New("invalid flag")
func (v *varValue) Set(val string) error {
x := strings.SplitN(val, "=", 2)
if len(x) < 2 {
return errInvalidFlag
}
*v = append(*v, x...)
return nil
}
var (
flagOut = flag.String("out", "out.archive", "output file")
flagFormat = flag.String("fmt", "tar", "file format, cpio/tar")
flagRootfs = flag.String("rootfs", "", "ELF rootfs")
flagPrint = flag.Bool("print", false, "print resolved tree in archivegen format")
flagTimestamp = flag.Bool("timestamp", false, "preserve file timestamps")
flagStdout = flag.Bool("stdout", false, "output to stdout")
flagVersion = flag.Bool("version", false, "version")
flagArchiveFormat = flag.Bool("format", false, "print archive format")
flagChdir = flag.String("C", "", "chdir")
)
const defaultBufSize = 1 << 24
func main() {
log.SetFlags(log.Lshortfile)
var varX varValue
flag.Var(&varX, "X", "variable\n"+
"e.g. '-X foo=bar -X a=b'",
)
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "%s %s\n", "archivegen", "[OPTIONS...] [FILES...]")
flag.PrintDefaults()
}
flag.Parse()
if *flagChdir != "" {
if err := os.Chdir(*flagChdir); err != nil {
log.Fatal(err)
}
}
if *flagArchiveFormat {
fmt.Fprintln(os.Stderr, helpFormat)
return
}
if *flagStdout {
flagOut = nil
}
if *flagVersion {
fmt.Printf("build: %s\nruntime: %s\n", buildversion, runtime.Version())
return
}
p := stdinPipe()
if flag.NArg() < 1 && !p {
log.Fatal("not enough arguments")
}
root := getTree(*flagRootfs, []string(varX), flag.Args(), p && flag.NArg() < 1)
if *flagPrint {
printTree(root)
os.Exit(0)
}
out := open(flagOut)
buf := bufio.NewWriterSize(out, defaultBufSize)
in := getArchive(*flagFormat, buf, *flagTimestamp)
if err := root.Write(rootprefix, in); err != nil {
log.Fatal("write:", err)
}
if err := in.Close(); err != nil {
log.Fatal("archive: close:", err)
}
if err := buf.Flush(); err != nil {
log.Fatal("buffer: flush:", err)
}
if err := out.Close(); err != nil {
log.Fatal("output: close:", err)
}
}