write etc/nix-store-paths in systemConfiguration

modules/jffs2.nix

@@ -5,7 +5,6 @@
 , ...
 }:
 let
-  inherit (pkgs) closureInfo;
   inherit (lib) mkIf;
 in
 {
@@ -36,11 +35,7 @@ in
           mkdir -p $TMPDIR/empty/nix/store/
           cp ${systemConfiguration}/bin/activate $TMPDIR/empty/activate
           ln -s ${pkgs.s6-init-bin}/bin/init $TMPDIR/empty/init
-          pkgClosure=${closureInfo {
-             rootPaths = [ systemConfiguration ];
-           }}
-          cp $pkgClosure/registration nix-path-registration
-          grafts=$(sed < $pkgClosure/store-paths 's/^\(.*\)$/--graft \1:\1/g')
+          grafts=$(sed < ${systemConfiguration}/etc/nix-store-paths 's/^\(.*\)$/--graft \1:\1/g')
           mkfs.jffs2 --compression-mode=size ${endian} -e ${config.hardware.flash.eraseBlockSize} --enable-compressor=lzo --pad --root $TMPDIR/empty --output $out  $grafts --squash --faketime
         '';
     };

pkgs/systemconfig/default.nix

@@ -8,6 +8,7 @@
   writeText
 , lib
 , s6-init-bin
+, closureInfo
 , stdenv
 }:
 let
@@ -61,7 +62,8 @@ let
     }
   '';
 in attrset:
-  stdenv.mkDerivation {
+  let makedevs = activateScript attrset;
+  in stdenv.mkDerivation {
     name="make-stuff";
     src = ./.;
 
@@ -69,11 +71,13 @@ in attrset:
     LDFLAGS  = "-static";
 
     postConfigure = ''
-      cp ${activateScript attrset} makedevs.c
+      cp ${makedevs} makedevs.c
     '';
     makeFlags = ["makedevs"];
     installPhase = ''
-      mkdir -p $out/bin
+      closure=${closureInfo { rootPaths = [ makedevs ]; }}
+      mkdir -p $out/bin $out/etc
+      cp $closure/store-paths $out/etc/nix-store-paths
       $STRIP --remove-section=.note  --remove-section=.comment --strip-all makedevs -o $out/bin/activate
       ln -s ${s6-init-bin}/bin/init $out/bin/init
     '';