From 56575cc0ac289d1f50358297cb72d9cd73f24630 Mon Sep 17 00:00:00 2001
From: Eric Sagnes <eric.sagnes@gmail.com>
Date: Fri, 29 Jul 2016 17:15:37 +0900
Subject: [PATCH] lib: add fileContents function

---
 lib/strings.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/strings.nix b/lib/strings.nix
index 5e5f7b378667..daf845839343 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -479,4 +479,14 @@ rec {
       absolutePaths = builtins.map (path: builtins.toPath (root + "/" + path)) relativePaths;
     in
       absolutePaths;
+
+  /* Read the contents of a file removing the trailing \n
+
+     Example:
+       $ echo "1.0" > ./version
+
+       fileContents ./version
+       => "1.0"
+  */
+  fileContents = file: removeSuffix "\n" (builtins.readFile file);
 }