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main.go
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main.go
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package main
import (
crand "crypto/rand"
"errors"
"flag"
"fmt"
"math/rand"
"os"
"time"
randomfiles "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-random-files"
ringreader "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-random-files/ringreader"
)
var usage = `usage: %s [options] <path>...
Write a random filesystem hierarchy to each <path>
Options:
`
// flags
var opts randomfiles.Options
var quiet bool
var alphabet string
var paths []string
var cryptorand bool
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, usage, os.Args[0])
flag.PrintDefaults()
}
flag.BoolVar(&quiet, "q", false, "quiet output")
flag.BoolVar(&cryptorand, "random-crypto", false, "use cryptographic randomness for files")
flag.StringVar(&alphabet, "alphabet", "easy", "alphabet for filenames {easy, hard}")
flag.IntVar(&opts.FileSize, "filesize", 4096, "filesize - how big to make each file (or max)")
flag.IntVar(&opts.FanoutDepth, "depth", 2, "fanout depth - how deep the hierarchy goes")
flag.IntVar(&opts.FanoutDirs, "dirs", 5, "fanout dirs - number of dirs per dir (or max)")
flag.IntVar(&opts.FanoutFiles, "files", 10, "fanout files - number of files per dir (or max")
flag.Int64Var(&opts.RandomSeed, "seed", 0, "random seed - 0 for current time")
flag.BoolVar(&opts.RandomFanout, "random-fanout", false, "randomize fanout numbers")
flag.BoolVar(&opts.RandomSize, "random-size", true, "randomize filesize")
}
func parseArgs() error {
flag.Parse()
switch alphabet {
case "easy":
opts.Alphabet = randomfiles.RunesEasy
case "hard":
opts.Alphabet = randomfiles.RunesHard
default:
return errors.New("alphabet must be one of: easy, hard")
}
paths = flag.Args()
if len(paths) < 1 {
flag.Usage()
os.Exit(0)
}
if !quiet {
opts.Out = os.Stdout
}
switch opts.RandomSeed {
case 0:
rand.Seed(time.Now().UnixNano())
default:
rand.Seed(opts.RandomSeed)
}
// prepare randomn source.
if cryptorand {
opts.Source = crand.Reader
} else {
// if not crypto, we don't need a lot of random
// data. we just need to sample from a sequence.
s := 16777216 // 16MB
r, err := ringreader.NewReader(s)
if err != nil {
return err
}
opts.Source = r
}
return nil
}
func run() error {
if err := parseArgs(); err != nil {
return err
}
for _, root := range paths {
if err := os.MkdirAll(root, 0755); err != nil {
return err
}
err := randomfiles.WriteRandomFiles(root, 1, &opts)
if err != nil {
return err
}
}
return nil
}
func main() {
if err := run(); err != nil {
fmt.Fprintln(os.Stderr, "error:", err)
os.Exit(1)
}
}