From 706a74ee9017192d5bb1cefb30b48aa189e85c88 Mon Sep 17 00:00:00 2001
From: Justin Bedo <cu@cua0.org>
Date: Tue, 2 Jun 2020 10:46:09 +1000
Subject: samtools-merge: noop if only a single file

---
 tools/samtools-merge.nix | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'tools')

diff --git a/tools/samtools-merge.nix b/tools/samtools-merge.nix
index 81b0c15..792ee52 100644
--- a/tools/samtools-merge.nix
+++ b/tools/samtools-merge.nix
@@ -16,6 +16,8 @@ in
 
 assert inputIsHomogenous;
 
+if length inputs == 1 then head inputs else
+
 stage {
   name = "samtools-merge";
   buildInputs = with pkgs; [ samtools ];
-- 
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