Factor out commonality between release.nix and shell.nix

release-common.nix

@@ -1,9 +1,11 @@
 { pkgs }:
 
+with pkgs;
+
 rec {
   # Use "busybox-sandbox-shell" if present,
   # if not (legacy) fallback and hope it's sufficient.
-  sh = pkgs.busybox-sandbox-shell or (pkgs.busybox.override {
+  sh = pkgs.busybox-sandbox-shell or (busybox.override {
     useMusl = true;
     enableStatic = true;
     enableMinimal = true;
@@ -30,7 +32,41 @@ rec {
   configureFlags =
     [ "--disable-init-state"
       "--enable-gc"
-    ] ++ pkgs.lib.optionals pkgs.stdenv.isLinux [
+    ] ++ lib.optionals stdenv.isLinux [
       "--with-sandbox-shell=${sh}/bin/busybox"
     ];
+
+  tarballDeps =
+    [ bison
+      flex
+      libxml2
+      libxslt
+      docbook5
+      docbook5_xsl
+      autoconf-archive
+      autoreconfHook
+    ];
+
+  buildDeps =
+    [ curl
+      bzip2 xz brotli
+      openssl pkgconfig sqlite boehmgc
+      boost
+
+      # Tests
+      git
+      mercurial
+    ]
+    ++ lib.optional stdenv.isLinux libseccomp
+    ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
+    ++ lib.optional (stdenv.isLinux || stdenv.isDarwin)
+      (aws-sdk-cpp.override {
+        apis = ["s3"];
+        customMemoryManagement = false;
+      });
+
+  perlDeps =
+    [ perl
+      perlPackages.DBDSQLite
+    ];
 }

release.nix

@@ -14,6 +14,8 @@ let
     tarball =
       with pkgs;
 
+      with import ./release-common.nix { inherit pkgs; };
+
       releaseTools.sourceTarball {
         name = "nix-tarball";
         version = builtins.readFile ./version;
@@ -21,13 +23,7 @@ let
         src = nix;
         inherit officialRelease;
 
-        buildInputs =
+        buildInputs = tarballDeps ++ buildDeps;
-          [ curl bison flex libxml2 libxslt
-            bzip2 xz brotli
-            pkgconfig sqlite libsodium boehmgc
-            docbook5 docbook5_xsl
-            autoconf-archive
-          ] ++ lib.optional stdenv.isLinux libseccomp;
 
         configureFlags = "--enable-gc";
 
@@ -67,23 +63,7 @@ let
         name = "nix";
         src = tarball;
 
-        buildInputs =
+        buildInputs = buildDeps;
-          [ curl
-            bzip2 xz brotli
-            openssl pkgconfig sqlite boehmgc
-            boost
-
-            # Tests
-            git
-            mercurial
-          ]
-          ++ lib.optional stdenv.isLinux libseccomp
-          ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
-          ++ lib.optional (stdenv.isLinux || stdenv.isDarwin)
-            (aws-sdk-cpp.override {
-              apis = ["s3"];
-              customMemoryManagement = false;
-            });
 
         configureFlags = configureFlags ++
           [ "--sysconfdir=/etc" ];

shell.nix

@@ -7,28 +7,7 @@ with import ./release-common.nix { inherit pkgs; };
 (if useClang then clangStdenv else stdenv).mkDerivation {
   name = "nix";
 
-  buildInputs =
+  buildInputs = buildDeps ++ tarballDeps ++ perlDeps;
-    [ curl bison flex libxml2 libxslt
-      bzip2 xz brotli
-      pkgconfig sqlite libsodium boehmgc
-      docbook5 docbook5_xsl
-      autoconf-archive
-      (aws-sdk-cpp.override {
-        apis = ["s3"];
-        customMemoryManagement = false;
-      })
-      autoreconfHook
-      boost
-
-      # For nix-perl
-      perl
-      perlPackages.DBDSQLite
-
-      # Tests
-      git
-      mercurial
-    ]
-    ++ lib.optional stdenv.isLinux libseccomp;
 
   inherit configureFlags;