From 31cf249aed7e47a59bc1ae231fb4c31810d9912a Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Tue, 19 Oct 2021 21:50:13 -0400
Subject: [PATCH] S3Backup: check for bzip2 and xz Nix Config support (Use of
 uninitialized value ::Config::xz in concatenation)

---
 src/lib/Hydra/Plugin/S3Backup.pm | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/lib/Hydra/Plugin/S3Backup.pm b/src/lib/Hydra/Plugin/S3Backup.pm
index bdd23b2f..a67082ec 100644
--- a/src/lib/Hydra/Plugin/S3Backup.pm
+++ b/src/lib/Hydra/Plugin/S3Backup.pm
@@ -21,11 +21,18 @@ sub isEnabled {
 }
 
 my $client;
-my %compressors = (
-    xz => "| $Nix::Config::xz",
-    bzip2 => "| $Nix::Config::bzip2",
-    none => ""
-);
+my %compressors = ();
+
+$compressors{"none"} = "";
+
+if (defined($Nix::Config::bzip2)) {
+    $compressors{"bzip2"} = "| $Nix::Config::bzip2",
+}
+
+if (defined($Nix::Config::xz)) {
+    $compressors{"xz"} = "| $Nix::Config::xz",
+}
+
 my $lockfile = Hydra::Model::DB::getHydraPath . "/.hydra-s3backup.lock";
 
 sub buildFinished {