From f6eb6af310945744a763147a4eeb5b64964afb54 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C8=98tefan=20Talpalaru?= <stefantalpalaru@yahoo.com>
Date: Mon, 1 Apr 2019 20:41:35 +0200
Subject: [PATCH] downloadFile(): print command in the error message

so people can figure out that they don't have "curl" installed
---
 beacon_chain/beacon_node.nim | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/beacon_chain/beacon_node.nim b/beacon_chain/beacon_node.nim
index 6a17b4fde..7778178c6 100644
--- a/beacon_chain/beacon_node.nim
+++ b/beacon_chain/beacon_node.nim
@@ -39,9 +39,10 @@ template `//`(url, fragment: string): string =
   url & "/" & fragment
 
 proc downloadFile(url: string): Future[string] {.async.} =
-  let (fileContents, errorCode) = execCmdEx("curl --fail " & url, options = {poUsePath})
+  let cmd = "curl --fail " & url
+  let (fileContents, errorCode) = execCmdEx(cmd, options = {poUsePath})
   if errorCode != 0:
-    raise newException(IOError, "Failed to download URL: " & url & "\n" & fileContents)
+    raise newException(IOError, "Failed external command: '" & cmd & "', exit code: " & $errorCode & ", output: '" & fileContents & "'")
   return fileContents
 
 proc updateTestnetMetadata(conf: BeaconNodeConf): Future[NetworkMetadata] {.async.} =