shells/linux: switch to buildable derivation

This way, I can build it up front easily, as part of another
derivation even.  And easily copy it between stores with
nix-copy-closure.

1 files changed, 6 insertions, 1 deletions

diff --git a/shells/linux.nix b/shells/linux.nix
index f611ef22a59b..3d371b0d6b21 100644
--- a/shells/linux.nix
+++ b/shells/linux.nix
@@ -1,7 +1,8 @@
 { pkgs ? import ../. {} }:
 with pkgs;
 
-mkShell {
+stdenv.mkDerivation {
+  name = "linux-shell";
   buildInputs = [
     bison flex bc elfutils openssl
 
@@ -12,4 +13,8 @@ mkShell {
     graphviz imagemagick python3Packages.sphinx python3Packages.sphinx_rtd_theme
     texlive.combined.scheme-minimal
   ];
+
+  buildCommand = ''
+    printf "%s\n" $buildInputs > $out
+  '';
 }