120 lines
2.2 KiB
Go
120 lines
2.2 KiB
Go
// Copyright (C) 2016 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package main
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import (
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"flag"
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"fmt"
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"io"
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"log"
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"math/rand"
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"os"
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"path/filepath"
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"time"
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)
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func main() {
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dir := flag.String("dir", "~/files", "Directory to generate into")
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files := flag.Int("files", 1000, "Number of files to create")
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maxExp := flag.Int("maxexp", 20, "Max size exponent")
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src := flag.String("src", "/dev/urandom", "Source of file data")
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flag.Parse()
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if err := generateFiles(*dir, *files, *maxExp, *src); err != nil {
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log.Println(err)
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}
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}
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func generateFiles(dir string, files, maxexp int, srcname string) error {
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fd, err := os.Open(srcname)
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if err != nil {
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return err
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}
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for i := 0; i < files; i++ {
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n := randomName()
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if rand.Float64() < 0.05 {
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// Some files and directories are dotfiles
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n = "." + n
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}
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p0 := filepath.Join(dir, string(n[0]), n[0:2])
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err = os.MkdirAll(p0, 0755)
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if err != nil {
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log.Fatal(err)
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}
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p1 := filepath.Join(p0, n)
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s := int64(1 << uint(rand.Intn(maxexp)))
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a := int64(128 * 1024)
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if a > s {
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a = s
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}
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s += rand.Int63n(a)
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if err := generateOneFile(fd, p1, s); err != nil {
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return err
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}
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}
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return nil
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}
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func generateOneFile(fd io.ReadSeeker, p1 string, s int64) error {
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src := io.LimitReader(&inifiteReader{fd}, s)
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dst, err := os.Create(p1)
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if err != nil {
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return err
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}
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_, err = io.Copy(dst, src)
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if err != nil {
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return err
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}
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err = dst.Close()
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if err != nil {
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return err
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}
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_ = os.Chmod(p1, os.FileMode(rand.Intn(0777)|0400))
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t := time.Now().Add(-time.Duration(rand.Intn(30*86400)) * time.Second)
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return os.Chtimes(p1, t, t)
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}
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func randomName() string {
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var b [16]byte
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readRand(b[:])
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return fmt.Sprintf("%x", b[:])
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}
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func readRand(bs []byte) (int, error) {
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var r uint32
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for i := range bs {
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if i%4 == 0 {
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r = uint32(rand.Int63())
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}
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bs[i] = byte(r >> uint((i%4)*8))
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}
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return len(bs), nil
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}
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type inifiteReader struct {
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rd io.ReadSeeker
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}
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func (i *inifiteReader) Read(bs []byte) (int, error) {
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n, err := i.rd.Read(bs)
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if err == io.EOF {
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err = nil
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i.rd.Seek(0, 0)
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}
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return n, err
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}
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