如何通过stdin将[] byte传递给外部exiftool？

Question

I am trying to do in golang the bash equivalent:

cat image.jpg | exiftool -author=some_auth - > updated_image.jpg

The exiftool '-' option makes it read from stdin, but say I have the image stored in a variable like var img []bytes //in golang

I want stdin to contain the bytes from img and the system call to exiftool to read these from stdin, save the result (stdout) in another []byte - I am new to golang, how what do i approach this ?

I don't want to save to temp files on disk.

Thanks

Answer 1

Something like

out, err := os.Create("updated_image.jpg")
if err != nil {
    log.Fatal(err)
}
cmd := exec.Command("exiftool", "-author=some_auth", "-")
cmd.Stdout = out
cmd.Stdin = bytes.NewReader(img)
err = cmd.Run()
if err != nil {
    log.Fatal(err)
}
out.Close()

should work.

Note that I haven't tested the code.