forked from mirrors/tar-split
111 lines
1.9 KiB
Go
111 lines
1.9 KiB
Go
// +build ignore
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package main
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import (
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"archive/tar"
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"compress/gzip"
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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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"log"
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"os"
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"github.com/vbatts/tar-split/tar/asm"
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"github.com/vbatts/tar-split/tar/storage"
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)
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var (
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flCleanup = flag.Bool("cleanup", true, "cleanup tempfiles")
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)
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func main() {
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flag.Parse()
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for _, arg := range flag.Args() {
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fh, err := os.Open(arg)
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if err != nil {
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log.Fatal(err)
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}
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defer fh.Close()
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fi, err := fh.Stat()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("inspecting %q (size %dk)\n", fh.Name(), fi.Size()/1024)
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packFh, err := ioutil.TempFile("", "packed.")
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if err != nil {
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log.Fatal(err)
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}
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defer packFh.Close()
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if *flCleanup {
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defer os.Remove(packFh.Name())
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}
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sp := storage.NewJSONPacker(packFh)
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fp := storage.NewDiscardFilePutter()
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dissam, err := asm.NewInputTarStream(fh, sp, fp)
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if err != nil {
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log.Fatal(err)
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}
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var num int
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tr := tar.NewReader(dissam)
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for {
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_, err = tr.Next()
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if err != nil {
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if err == io.EOF {
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break
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}
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log.Fatal(err)
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}
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num++
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if _, err := io.Copy(ioutil.Discard, tr); err != nil {
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log.Fatal(err)
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}
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}
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fmt.Printf(" -- number of files: %d\n", num)
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if err := packFh.Sync(); err != nil {
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log.Fatal(err)
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}
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fi, err = packFh.Stat()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf(" -- size of metadata uncompressed: %dk\n", fi.Size()/1024)
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gzPackFh, err := ioutil.TempFile("", "packed.gz.")
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if err != nil {
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log.Fatal(err)
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}
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defer gzPackFh.Close()
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if *flCleanup {
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defer os.Remove(gzPackFh.Name())
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}
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gzWrtr := gzip.NewWriter(gzPackFh)
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if _, err := packFh.Seek(0, 0); err != nil {
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log.Fatal(err)
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}
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if _, err := io.Copy(gzWrtr, packFh); err != nil {
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log.Fatal(err)
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}
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gzWrtr.Close()
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if err := gzPackFh.Sync(); err != nil {
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log.Fatal(err)
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}
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fi, err = gzPackFh.Stat()
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf(" -- size of gzip compressed metadata: %dk\n", fi.Size()/1024)
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}
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}
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