rclone/bin/make_test_files.go
2018-05-09 16:59:29 +01:00

147 lines
3.8 KiB
Go

// +build ignore
// Build a directory structure with the required number of files in
//
// Run with go run make_test_files.go [flag] <directory>
package main
import (
cryptrand "crypto/rand"
"flag"
"io"
"log"
"math/rand"
"os"
"path/filepath"
)
var (
// Flags
numberOfFiles = flag.Int("n", 1000, "Number of files to create")
averageFilesPerDirectory = flag.Int("files-per-directory", 10, "Average number of files per directory")
maxDepth = flag.Int("max-depth", 10, "Maximum depth of directory heirachy")
minFileSize = flag.Int64("min-size", 0, "Minimum size of file to create")
maxFileSize = flag.Int64("max-size", 100, "Maximum size of files to create")
minFileNameLength = flag.Int("min-name-length", 4, "Minimum size of file to create")
maxFileNameLength = flag.Int("max-name-length", 12, "Maximum size of files to create")
directoriesToCreate int
totalDirectories int
fileNames = map[string]struct{}{} // keep a note of which file name we've used already
)
// randomString create a random string for test purposes
func randomString(n int) string {
const (
vowel = "aeiou"
consonant = "bcdfghjklmnpqrstvwxyz"
digit = "0123456789"
)
pattern := []string{consonant, vowel, consonant, vowel, consonant, vowel, consonant, digit}
out := make([]byte, n)
p := 0
for i := range out {
source := pattern[p]
p = (p + 1) % len(pattern)
out[i] = source[rand.Intn(len(source))]
}
return string(out)
}
// fileName creates a unique random file or directory name
func fileName() (name string) {
for {
length := rand.Intn(*maxFileNameLength-*minFileNameLength) + *minFileNameLength
name = randomString(length)
if _, found := fileNames[name]; !found {
break
}
}
fileNames[name] = struct{}{}
return name
}
// dir is a directory in the directory heirachy being built up
type dir struct {
name string
depth int
children []*dir
parent *dir
}
// Create a random directory heirachy under d
func (d *dir) createDirectories() {
for totalDirectories < directoriesToCreate {
newDir := &dir{
name: fileName(),
depth: d.depth + 1,
parent: d,
}
d.children = append(d.children, newDir)
totalDirectories++
switch rand.Intn(4) {
case 0:
if d.depth < *maxDepth {
newDir.createDirectories()
}
case 1:
return
}
}
return
}
// list the directory heirachy
func (d *dir) list(path string, output []string) []string {
dirPath := filepath.Join(path, d.name)
output = append(output, dirPath)
for _, subDir := range d.children {
output = subDir.list(dirPath, output)
}
return output
}
// writeFile writes a random file at dir/name
func writeFile(dir, name string) {
err := os.MkdirAll(dir, 0777)
if err != nil {
log.Fatalf("Failed to make directory %q: %v", dir, err)
}
path := filepath.Join(dir, name)
fd, err := os.Create(path)
if err != nil {
log.Fatalf("Failed to open file %q: %v", path, err)
}
size := rand.Int63n(*maxFileSize-*minFileSize) + *minFileSize
_, err = io.CopyN(fd, cryptrand.Reader, size)
if err != nil {
log.Fatalf("Failed to write %v bytes to file %q: %v", size, path, err)
}
err = fd.Close()
if err != nil {
log.Fatalf("Failed to close file %q: %v", path, err)
}
}
func main() {
flag.Parse()
args := flag.Args()
if len(args) != 1 {
log.Fatalf("Require 1 directory argument")
}
outputDirectory := args[0]
log.Printf("Output dir %q", outputDirectory)
directoriesToCreate = *numberOfFiles / *averageFilesPerDirectory
log.Printf("directoriesToCreate %v", directoriesToCreate)
root := &dir{name: outputDirectory, depth: 1}
for totalDirectories < directoriesToCreate {
root.createDirectories()
}
dirs := root.list("", []string{})
for i := 0; i < *numberOfFiles; i++ {
dir := dirs[rand.Intn(len(dirs))]
writeFile(dir, fileName())
}
}