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cmd/utils: print errors only once if stdout and stderr are the same file

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This commit is contained in:
Felix Lange 2015-05-27 15:48:07 +02:00
parent 74706a0f02
commit 705beb4c25
1 changed files with 10 additions and 3 deletions
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13
cmd/utils/cmd.go
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@ -125,10 +125,17 @@ func initDataDir(Datadir string) {
}
}
// Fatalf formats a message to standard output and exits the program.
// Fatalf formats a message to standard error and exits the program.
// The message is also printed to standard output if standard error
// is redirected to a different file.
func Fatalf(format string, args ...interface{}) {
fmt.Fprintf(os.Stderr, "Fatal: "+format+"\n", args...)
fmt.Fprintf(os.Stdout, "Fatal: "+format+"\n", args...)
w := io.MultiWriter(os.Stdout, os.Stderr)
outf, _ := os.Stdout.Stat()
errf, _ := os.Stderr.Stat()
if outf != nil && errf != nil && os.SameFile(outf, errf) {
w = os.Stderr
}
fmt.Fprintf(w, "Fatal: "+format+"\n", args...)
logger.Flush()
os.Exit(1)
}