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-rw-r--r--nixos/lib/make-system-tarball.nix14
1 files changed, 11 insertions, 3 deletions
diff --git a/nixos/lib/make-system-tarball.nix b/nixos/lib/make-system-tarball.nix
index a2a0340a6bd3..92539235be75 100644
--- a/nixos/lib/make-system-tarball.nix
+++ b/nixos/lib/make-system-tarball.nix
@@ -1,4 +1,4 @@
-{ stdenv, perl, xz, pathsFromGraph
+{ stdenv, perl, pixz, pathsFromGraph
 
 , # The file name of the resulting tarball
   fileName ? "nixos-system-${stdenv.system}"
@@ -21,14 +21,20 @@
 
   # Extra tar arguments
 , extraArgs ? ""
+  # Command used for compression
+, compressCommand ? "pixz"
+  # Extension for the compressed tarball
+, compressionExtension ? ".xz"
+  # extra inputs, like the compressor to use
+, extraInputs ? [ pixz ]
 }:
 
 stdenv.mkDerivation {
   name = "tarball";
   builder = ./make-system-tarball.sh;
-  buildInputs = [perl xz];
+  buildInputs = [ perl ] ++ extraInputs;
 
-  inherit fileName pathsFromGraph extraArgs extraCommands;
+  inherit fileName pathsFromGraph extraArgs extraCommands compressCommand;
 
   # !!! should use XML.
   sources = map (x: x.source) contents;
@@ -41,4 +47,6 @@ stdenv.mkDerivation {
   # For obtaining the closure of `storeContents'.
   exportReferencesGraph =
     map (x: [("closure-" + baseNameOf x.object) x.object]) storeContents;
+
+  extension = compressionExtension;
 }