From 2de0cf2549e79427fd23f0ce2f2b0021247ba07e Mon Sep 17 00:00:00 2001
From: "William A. Kennington III" <william@wkennington.com>
Date: Wed, 3 Sep 2014 18:40:05 -0700
Subject: [PATCH] nixos/utils: Don't remove first character if not a /

---
 nixos/lib/utils.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nixos/lib/utils.nix b/nixos/lib/utils.nix
index 35c56e8c32bb..7b8be2050c13 100644
--- a/nixos/lib/utils.nix
+++ b/nixos/lib/utils.nix
@@ -5,6 +5,7 @@ rec {
   # Escape a path according to the systemd rules, e.g. /dev/xyzzy
   # becomes dev-xyzzy.  FIXME: slow.
   escapeSystemdPath = s:
-   replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"] (substring 1 (stringLength s) s);
+   replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"]
+    (if hasPrefix "/" s then substring 1 (stringLength s) s else s);
 
 }