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package main
import (
"archive/tar"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"github.com/vbatts/tar-split/tar/asm"
"github.com/vbatts/tar-split/tar/storage"
)
func CommandChecksize(c *cli.Context) {
if len(c.Args()) == 0 {
logrus.Fatalf("please specify tar archives to check ('-' will check stdin)")
}
for _, arg := range c.Args() {
fh, err := os.Open(arg)
if err != nil {
log.Fatal(err)
}
defer fh.Close()
fi, err := fh.Stat()
if err != nil {
log.Fatal(err)
}
fmt.Printf("inspecting %q (size %dk)\n", fh.Name(), fi.Size()/1024)
packFh, err := ioutil.TempFile("", "packed.")
if err != nil {
log.Fatal(err)
}
defer packFh.Close()
if !c.Bool("work") {
defer os.Remove(packFh.Name())
} else {
fmt.Printf(" -- working file preserved: %s\n", packFh.Name())
}
sp := storage.NewJSONPacker(packFh)
fp := storage.NewDiscardFilePutter()
dissam, err := asm.NewInputTarStream(fh, sp, fp)
if err != nil {
log.Fatal(err)
}
var num int
tr := tar.NewReader(dissam)
for {
_, err = tr.Next()
if err != nil {
if err == io.EOF {
break
}
log.Fatal(err)
}
num++
if _, err := io.Copy(ioutil.Discard, tr); err != nil {
log.Fatal(err)
}
}
fmt.Printf(" -- number of files: %d\n", num)
if err := packFh.Sync(); err != nil {
log.Fatal(err)
}
fi, err = packFh.Stat()
if err != nil {
log.Fatal(err)
}
fmt.Printf(" -- size of metadata uncompressed: %dk\n", fi.Size()/1024)
gzPackFh, err := ioutil.TempFile("", "packed.gz.")
if err != nil {
log.Fatal(err)
}
defer gzPackFh.Close()
if !c.Bool("work") {
defer os.Remove(gzPackFh.Name())
}
gzWrtr := gzip.NewWriter(gzPackFh)
if _, err := packFh.Seek(0, 0); err != nil {
log.Fatal(err)
}
if _, err := io.Copy(gzWrtr, packFh); err != nil {
log.Fatal(err)
}
gzWrtr.Close()
if err := gzPackFh.Sync(); err != nil {
log.Fatal(err)
}
fi, err = gzPackFh.Stat()
if err != nil {
log.Fatal(err)
}
fmt.Printf(" -- size of gzip compressed metadata: %dk\n", fi.Size()/1024)
}
}
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