From 3b5456608a680a0cf7e488c7ddd250b6fef3eac1 Mon Sep 17 00:00:00 2001
From: Michael Lohmann <michael.lohmann@bevuta.com>
Date: Tue, 3 Jan 2023 20:16:50 +0100
Subject: [PATCH] nixos-version: print error for missing revision to stderr

---
 nixos/modules/installer/tools/nixos-version.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/installer/tools/nixos-version.sh b/nixos/modules/installer/tools/nixos-version.sh
index 8727cd2f876f..39e34a3718cb 100644
--- a/nixos/modules/installer/tools/nixos-version.sh
+++ b/nixos/modules/installer/tools/nixos-version.sh
@@ -8,7 +8,7 @@ case "$1" in
     ;;
   --hash|--revision)
     if ! [[ @revision@ =~ ^[0-9a-f]+$ ]]; then
-      echo "$0: Nixpkgs commit hash is unknown"
+      echo "$0: Nixpkgs commit hash is unknown" >&2
       exit 1
     fi
     echo "@revision@"