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main.go
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main.go
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package main
import (
"github.com/cheggaaa/pb"
"github.com/sirupsen/logrus"
"io"
"os"
"syscall"
)
func main() {
if len(os.Args) != 3 {
logrus.Fatalln("Usage: ddgo <src> <dest>")
}
src := os.Args[1]
dst := os.Args[2]
fd, err := os.OpenFile(src, os.O_RDONLY, 0)
if err != nil {
logrus.Fatalln("failed to open src:", err)
}
defer fd.Close()
srcLen, err := fd.Seek(0, 2)
if err != nil {
logrus.Fatalln(err)
}
_, err = fd.Seek(0, 0)
if err != nil {
logrus.Fatalln(err)
}
bar := pb.New64(srcLen)
bar.SetUnits(pb.U_BYTES)
bar.ShowSpeed = true
bar.ShowTimeLeft = true
out, err := os.OpenFile(dst, os.O_WRONLY|syscall.O_DIRECT, 0777)
if err != nil {
logrus.Fatalln("failed to open dst:", err)
}
defer out.Close()
dstLen, err := out.Seek(0, 2)
if err != nil {
logrus.Fatalln(err)
}
_, err = out.Seek(0, 0)
if err != nil {
logrus.Fatalln(err)
}
if dstLen < srcLen {
bar.Total = dstLen
}
bar.Start()
if dstLen < srcLen {
logrus.Warnln("destination device too small, not all bytes will be copied")
_, err = io.Copy(io.MultiWriter(bar, out), io.LimitReader(fd, dstLen))
} else {
_, err = io.Copy(io.MultiWriter(bar, out), fd)
}
if err != nil {
logrus.Fatalln("copy failed:", err)
}
bar.Finish()
fd.Close()
out.Close()
}