Check for existance of path instead of GOOS

main.go

@@ -6,7 +6,6 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"runtime"
 
 	"github.com/reujab/wallpaper"
 )
@@ -29,7 +28,7 @@ func main() {
 	}
 	err = wallpaper.SetFromURL(apod.Hdurl)
 	if err != nil {
-		log.Fatalf("\nUnable to set wallpaper\n")
+		log.Fatalf("\nUnable to set wallpaper: %+v\n", err)
 		return
 	}
 	err = wallpaper.SetMode(wallpaper.Center)
@@ -37,11 +36,11 @@ func main() {
 		log.Fatalf("\nUnable to set wallpaper mode\n")
 		return
 	}
-
-	if runtime.GOOS != "windows" {
+	// https://gist.github.com/mattes/d13e273314c3b3ade33f
+	if _, err := os.Stat("/usr/share/backgrounds/spaceface"); !os.IsNotExist(err) {
 		err = downloadFile("/usr/share/backgrounds/spaceface/lock.jpg", apod.Hdurl)
 		if err != nil {
-			log.Fatalf("\nUnable to Download lock.jpg image\n")
+			log.Fatalf("\nUnable to Download lock.jpg image: %+v\n", err)
 			return
 		}
 	}