initramfs: move most of it into upstream/six-initrd submodule

.gitmodules

@@ -3,3 +3,6 @@
         shallow = true
 	url = https://github.com/nixos/nixpkgs
 	branch = nixos-unstable
+[submodule "upstream/six-initrd"]
+	path = upstream/six-initrd
+	url = https://git.sr.ht/~amjoseph/six-initrd

src/default.nix

@@ -2,6 +2,7 @@
 , lib          ? import (nixpkgs + "/lib")
 , pkgsFun      ? import nixpkgs
 , hostPlatform ? null         # if left `null` this will be set based on the ./platform/
+, six-initrd   ? import ../upstream/six-initrd/default.nix
 }:
 let
   nixpkgsArgs = { config.allowNonSource = false; };
@@ -35,7 +36,13 @@ let
       coreboot = final.callPackage ./coreboot { };
       image         = final.callPackage ./image { };
       kernel        = final.callPackage ./kernel { };
-      initramfs     = final.callPackage ./initramfs { };
+      initramfs     = final.callPackage ./initramfs {
+        six-initrd = (six-initrd {
+          inherit (final) lib;
+          pkgsForHost = final.nixpkgsOnBuildForHost;
+          pkgsForBuild = final.nixpkgsOnBuildForBuild;
+        }).minimal;
+      };
       flashrom      = final.nixpkgsOnBuildForHost.callPackage ./util/flashrom { };
       main          = final.callPackage ./main { };
       scripts       = prev.scripts or {

src/initramfs/default.nix

@@ -5,39 +5,17 @@
 { lib
 , nixpkgsOnBuildForHost
 , nixpkgsOnBuildForBuild
-, kernel
 , bootScript ? ../boot.sh   # symlinked to /init if non-null
 
-# a list of paths (relative to ${kernel}/lib/modules/*/kernel) to modules .ko
-# files which should be included in the initrd
-, modules ? [ ]
-
-# An attrset containing additional files to include in the initramfs
-# image.  Each attrname in this set is a path relative to the root
-# of the initramfs (e.g. "bin/signify") and the corresponding value is
-# the file to be copied to that location (e.g. "${signify}/bin/signify).
-#
-# - If the attrvalue has a trailing "/" then both the source and
-#   destination are considered to be directories; the source will be
-#   copied recursively, and symbolic links therein will be preserved
-#   (i.e. not dereferenced).  See `withBusybox` below for an example.
-#
-# - If the attrvalue does NOT have a trailing "/" then both the
-#   source and destination are considered to be files.  If the
-#   source is a symbolic link it will be dereferenced before copying.
-#
-# After copying, `chmod -R u+w` is performed, since the contents are
-# likely to be coming from /nix/store where Nix clears the u-w bit.
-#
+# see six-initrd
 , contents ? {}
+, kernel ? null
+, modules ? []
+, symlinkUsrToRoot ? true
+, symlinkSbinToBin ? true
 
-# cause usr/{bin,sbin} to be symlinks to {bin/sbin}
-, withMergedUsr ? true
-
-# cause sbin to be a symlink to bin
-, withMergedBinSbin ? true
+, six-initrd
 
-, withBusybox ? true
 , withSignify ? true
 # Inclusion of these is temporarily disabled.  I had a bunch of
 # ugly space-saving hacks that were removed during the pre-release
@@ -51,21 +29,18 @@
 }:
 
 let
-  inherit (nixpkgsOnBuildForBuild) findutils cpio;
-  inherit (nixpkgsOnBuildForHost.pkgsStatic) stdenv busybox signify lvm2 cryptsetup kexec-tools;
+  inherit (nixpkgsOnBuildForHost.pkgsStatic) signify lvm2 cryptsetup kexec-tools;
   nvramtool = nixpkgsOnBuildForHost.pkgsStatic.nvramtool.overrideAttrs(a: {
     NIX_CFLAGS_COMPILE = "-D__GLIBC__";
   });
-  contents' = (lib.pipe modules [
-    (map (m: let name = "${kernel.version}/kernel/${m}";
-             in {
-               name = "lib/modules/${name}";            # dest
-               value = "${kernel}/lib/modules/${name}"; # source
-             }))
-    lib.listToAttrs
-  ]) // lib.optionalAttrs withBusybox {
-    "bin" = "${busybox}/bin/";
-  } // lib.optionalAttrs withSignify {
+
+in
+six-initrd.override {
+  inherit lib;
+  pkgsForBuild = nixpkgsOnBuildForBuild;
+  pkgsForHost = nixpkgsOnBuildForHost;
+  inherit kernel modules;
+  contents = lib.optionalAttrs withSignify {
     "bin/signify" = "${signify}/bin/signify";
   } // lib.optionalAttrs withLvm {
     "bin/lvm" = "${lib.getBin lvm2}/bin/lvm";
@@ -79,45 +54,4 @@ let
   } // lib.optionalAttrs (bootScript != null) {
     "sbin/init" = "${bootScript}";
   } // contents;
-
-in stdenv.mkDerivation {
-  name = "initramfs.cpio";
-  dontUnpack = true;
-  dontFixup = true;
-
-  buildPhase = ''
-    runHook preBuild
-  '' + lib.optionalString withMergedBinSbin ''
-    ln -s bin sbin
-  '' + lib.optionalString withMergedUsr ''
-    mkdir -p usr
-    ln -s ../bin usr/bin
-    ln -s ../sbin usr/sbin
-  '' + (lib.pipe contents' [
-        (lib.mapAttrsToList (dest: src:
-          if lib.hasSuffix "/" src then ''
-            mkdir -p ${lib.escapeShellArg (builtins.dirOf dest)}
-            cp -Tr ${lib.escapeShellArg src} ${lib.escapeShellArg dest}
-            chmod -R u+w ${lib.escapeShellArg dest}
-          '' else ''
-            install -vDT ${lib.escapeShellArg src} ${lib.escapeShellArg dest}
-          ''))
-        lib.concatStrings
-      ]) +
-  ''
-    runHook postBuild
-  '';
-
-  installPhase = ''
-    runHook preInstall
-    chmod -R u+w $NIX_BUILD_TOP
-    pushd $NIX_BUILD_TOP
-      ${findutils}/bin/find . | ${cpio}/bin/cpio --create -H newc -R +0:+0 > $out
-      popd
-    runHook postInstall
-  '';
-
-  passthru = {
-    inherit modules;
-  };
 }

upstream/six-initrd

@@ -0,0 +1 @@
+Subproject commit 01a91149307d7a128a4e63f9ae8186e6331397f8