100 lines
1.7 KiB
Go
100 lines
1.7 KiB
Go
// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
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// All rights reserved. Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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import (
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"crypto/rand"
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"flag"
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"fmt"
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"io"
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"log"
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mr "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 name() string {
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var b [16]byte
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rand.Reader.Read(b[:])
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return fmt.Sprintf("%x", b[:])
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}
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func main() {
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var files int
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var maxexp int
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var srcname string
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flag.IntVar(&files, "files", 1000, "Number of files")
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flag.IntVar(&maxexp, "maxexp", 20, "Maximum file size (max = 2^n + 128*1024 B)")
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flag.StringVar(&srcname, "src", "/usr/share/dict/words", "Source material")
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flag.Parse()
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fd, err := os.Open(srcname)
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if err != nil {
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log.Fatal(err)
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}
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for i := 0; i < files; i++ {
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n := name()
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p0 := filepath.Join(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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s := 1 << uint(mr.Intn(maxexp))
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a := 128 * 1024
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if a > s {
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a = s
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}
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s += mr.Intn(a)
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src := io.LimitReader(&inifiteReader{fd}, int64(s))
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p1 := filepath.Join(p0, n)
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dst, err := os.Create(p1)
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if err != nil {
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log.Fatal(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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log.Fatal(err)
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}
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err = dst.Close()
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if err != nil {
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log.Fatal(err)
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}
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err = os.Chmod(p1, os.FileMode(mr.Intn(0777)|0400))
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if err != nil {
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log.Fatal(err)
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}
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t := time.Now().Add(-time.Duration(mr.Intn(30*86400)) * time.Second)
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err = os.Chtimes(p1, t, t)
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if err != nil {
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log.Fatal(err)
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}
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}
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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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