/
tipper.go
133 lines (113 loc) · 2.17 KB
/
tipper.go
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package main
import (
"crypto/sha256"
"flag"
"fmt"
"io"
"log"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
"time"
)
const (
checksumFileName = "sha256.txt"
)
func checksumFile(path string) (string, error) {
f, err := os.Open(path)
if err != nil {
return "", err
}
defer f.Close()
h := sha256.New()
if _, err = io.Copy(h, f); err != nil {
return "", err
}
return fmt.Sprintf("%064x", h.Sum(nil)), nil
}
func createChecksumFile() {
paths := make(chan string)
lines := make(chan string)
go func() {
err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
if path == ".git" {
return filepath.SkipDir
}
return nil
}
if !strings.HasSuffix(path, ".tar.gz") {
return nil
}
paths <- path
return nil
})
if err != nil {
log.Fatal(err)
}
close(paths)
}()
var wg sync.WaitGroup
for i := 0; i < runtime.GOMAXPROCS(-1); i++ {
wg.Add(1)
go func() {
defer wg.Done()
for path := range paths {
checksum, err := checksumFile(path)
if err != nil {
log.Fatal(err)
}
lines <- fmt.Sprintf("%s %s", checksum, path)
}
}()
}
go func() {
wg.Wait()
close(lines)
}()
f, err := os.Create(checksumFileName)
if err != nil {
log.Fatal(err)
}
for line := range lines {
if _, err = f.WriteString(line + "\n"); err != nil {
log.Fatal(err)
}
}
if err = f.Close(); err != nil {
log.Fatal(err)
}
log.Printf("%s created.", checksumFileName)
}
func createTimestampFile() {
now := time.Now().UTC()
name := fmt.Sprintf("Built on %s.txt", now.Format("2006-01-02"))
data := []byte(fmt.Sprintf("Built on %s.\n", now.Format("2006-01-02T15:04:05Z07:00")))
if err := os.WriteFile(name, data, 0o644); err != nil {
log.Fatal(err)
}
log.Printf("%q created.", name)
}
func main() {
log.SetPrefix("tipper: ")
log.SetFlags(log.Lmsgprefix)
flag.Parse()
for _, cmd := range flag.Args() {
switch cmd {
case "all":
createChecksumFile()
createTimestampFile()
case "checksum":
createChecksumFile()
case "timestamp":
createTimestampFile()
default:
log.Fatalf("Unhandled command %q.", cmd)
}
}
}