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cmd/tar-split: adding a cli tool for asm/disasm
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25
cmd/tar-split/README.md
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25
cmd/tar-split/README.md
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## tar-split utility
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## Usage
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### Disassembly
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```bash
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$ sha256sum archive.tar
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d734a748db93ec873392470510b8a1c88929abd8fae2540dc43d5b26f7537868 archive.tar
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$ mkdir ./x
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$ tar-split d --output tar-data.json.gz ./archive.tar | tar -C ./x -x
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time="2015-07-20T15:45:04-04:00" level=info msg="created tar-data.json.gz from ./archive.tar (read 204800 bytes)"
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```
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### Assembly
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```bash
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$ tar-split a --output new.tar --input ./tar-data.json.gz --path ./x/
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INFO[0000] created new.tar from ./x/ and ./tar-data.json.gz (wrote 204800 bytes)
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$ sha256sum new.tar
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d734a748db93ec873392470510b8a1c88929abd8fae2540dc43d5b26f7537868 new.tar
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```
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175
cmd/tar-split/main.go
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175
cmd/tar-split/main.go
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// go:generate git tag | tail -1
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package main
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import (
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"compress/gzip"
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"io"
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"os"
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"github.com/Sirupsen/logrus"
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"github.com/codegangsta/cli"
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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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func main() {
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app := cli.NewApp()
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app.Name = "tar-split"
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app.Usage = "tar assembly and disassembly utility"
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app.Version = "0.9.2"
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app.Author = "Vincent Batts"
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app.Email = "vbatts@hashbangbash.com"
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app.Action = cli.ShowAppHelp
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app.Before = func(c *cli.Context) error {
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logrus.SetOutput(os.Stderr)
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if c.Bool("debug") {
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logrus.SetLevel(logrus.DebugLevel)
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}
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return nil
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}
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app.Flags = []cli.Flag{
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cli.BoolFlag{
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Name: "debug, D",
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Usage: "debug output",
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// defaults to false
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},
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}
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app.Commands = []cli.Command{
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{
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Name: "disasm",
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Aliases: []string{"d"},
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Usage: "disassemble the input tar stream",
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Action: CommandDisasm,
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "output",
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Value: "tar-data.json.gz",
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Usage: "output of disassembled tar stream",
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},
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},
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},
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{
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Name: "asm",
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Aliases: []string{"a"},
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Usage: "assemble tar stream",
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Action: CommandAsm,
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "input",
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Value: "tar-data.json.gz",
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Usage: "input of disassembled tar stream",
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},
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cli.StringFlag{
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Name: "output",
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Value: "-",
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Usage: "reassembled tar archive",
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},
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cli.StringFlag{
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Name: "path",
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Value: "",
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Usage: "relative path of extracted tar",
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},
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},
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},
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}
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if err := app.Run(os.Args); err != nil {
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logrus.Fatal(err)
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}
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}
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func CommandDisasm(c *cli.Context) {
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if len(c.Args()) != 1 {
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logrus.Fatalf("please specify tar to be disabled <NAME|->")
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}
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if len(c.String("output")) == 0 {
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logrus.Fatalf("--output filename must be set")
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}
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// Set up the tar input stream
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var inputStream io.Reader
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if c.Args()[0] == "-" {
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inputStream = os.Stdin
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} else {
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fh, err := os.Open(c.Args()[0])
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if err != nil {
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logrus.Fatal(err)
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}
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defer fh.Close()
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inputStream = fh
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}
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// Set up the metadata storage
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mf, err := os.OpenFile(c.String("output"), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
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if err != nil {
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logrus.Fatal(err)
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}
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defer mf.Close()
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mfz := gzip.NewWriter(mf)
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defer mfz.Close()
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metaPacker := storage.NewJSONPacker(mfz)
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// we're passing nil here for the file putter, because the ApplyDiff will
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// handle the extraction of the archive
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its, err := asm.NewInputTarStream(inputStream, metaPacker, nil)
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if err != nil {
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logrus.Fatal(err)
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}
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i, err := io.Copy(os.Stdout, its)
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if err != nil {
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logrus.Fatal(err)
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}
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logrus.Infof("created %s from %s (read %d bytes)", c.String("output"), c.Args()[0], i)
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}
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func CommandAsm(c *cli.Context) {
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if len(c.Args()) > 0 {
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logrus.Warnf("%d additional arguments passed are ignored", len(c.Args()))
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}
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if len(c.String("input")) == 0 {
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logrus.Fatalf("--input filename must be set")
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}
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if len(c.String("output")) == 0 {
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logrus.Fatalf("--output filename must be set ([FILENAME|-])")
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}
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if len(c.String("path")) == 0 {
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logrus.Fatalf("--path must be set")
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}
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var outputStream io.Writer
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if c.String("output") == "-" {
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outputStream = os.Stdout
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} else {
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fh, err := os.Create(c.String("output"))
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if err != nil {
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logrus.Fatal(err)
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}
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defer fh.Close()
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outputStream = fh
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}
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// Get the tar metadata reader
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mf, err := os.Open(c.String("input"))
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if err != nil {
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logrus.Fatal(err)
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}
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defer mf.Close()
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mfz, err := gzip.NewReader(mf)
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if err != nil {
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logrus.Fatal(err)
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}
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defer mfz.Close()
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metaUnpacker := storage.NewJSONUnpacker(mfz)
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// XXX maybe get the absolute path here
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fileGetter := storage.NewPathFileGetter(c.String("path"))
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ots := asm.NewOutputTarStream(fileGetter, metaUnpacker)
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defer ots.Close()
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i, err := io.Copy(outputStream, ots)
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if err != nil {
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logrus.Fatal(err)
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}
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logrus.Infof("created %s from %s and %s (wrote %d bytes)", c.String("output"), c.String("path"), c.String("input"), i)
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}
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