syncthing/integration/genfiles.go

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package main
import (
"crypto/rand"
"flag"
"fmt"
"io/ioutil"
mr "math/rand"
"os"
"path"
)
func name() string {
var b [16]byte
rand.Reader.Read(b[:])
return fmt.Sprintf("%x", b[:])
}
func main() {
var files int
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var maxexp int
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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.Parse()
for i := 0; i < files; i++ {
n := name()
p0 := path.Join(string(n[0]), n[0:2])
os.MkdirAll(p0, 0755)
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s := 1 << uint(mr.Intn(maxexp))
a := 128 * 1024
if a > s {
a = s
}
s += mr.Intn(a)
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b := make([]byte, s)
rand.Reader.Read(b)
p1 := path.Join(p0, n)
ioutil.WriteFile(p1, b, 0644)
}
}