push sheeet

pkgs/build-support/nuke-references/default.nix

@@ -0,0 +1,40 @@
+# The program `nuke-refs' created by this derivation replaces all
+# references to the Nix store in the specified files by a non-existent
+# path (/nix/store/eeee...).  This is useful for getting rid of
+# dependencies that you know are not actually needed at runtime.
+
+{
+  lib,
+  stdenvNoCC,
+  perl,
+  signingUtils,
+  shell ? stdenvNoCC.shell,
+}:
+
+stdenvNoCC.mkDerivation {
+  name = "nuke-references";
+
+  strictDeps = true;
+  enableParallelBuilding = true;
+  dontUnpack = true;
+  dontConfigure = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    substituteAll ${./nuke-refs.sh} $out/bin/nuke-refs
+    chmod a+x $out/bin/nuke-refs
+  '';
+
+  # FIXME: get rid of perl dependency.
+  env = {
+    inherit perl;
+    inherit (builtins) storeDir;
+    shell = lib.getBin shell + (shell.shellPath or "");
+    signingUtils = lib.optionalString (
+      stdenvNoCC.targetPlatform.isDarwin && stdenvNoCC.targetPlatform.isAarch64
+    ) signingUtils;
+  };
+
+  meta.mainProgram = "nuke-refs";
+}

pkgs/build-support/nuke-references/nuke-refs.sh

@@ -0,0 +1,32 @@
+#! @shell@
+
+fixupHooks=()
+
+if [[ -n "@signingUtils@" ]]; then
+    source "@signingUtils@"
+fi
+
+excludes=""
+while getopts e: o; do
+    case "$o" in
+        e) storeId=$(echo "$OPTARG" | @perl@/bin/perl -ne "print \"\$1\" if m|^\Q@storeDir@\E/([a-z0-9]{32})-.*|")
+           if [ -z "$storeId" ]; then
+               echo "-e argument must be a Nix store path"
+               exit 1
+           fi
+           excludes="$excludes(?!$storeId)"
+        ;;
+    esac
+done
+shift $(($OPTIND-1))
+
+for i in "$@"; do
+    if test ! -L "$i" -a -f "$i"; then
+        cat "$i" | @perl@/bin/perl -pe "s|\Q@storeDir@\E/$excludes[a-z0-9]{32}-|@storeDir@/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-|g" > "$i.tmp"
+        if test -x "$i"; then chmod +x "$i.tmp"; fi
+        mv "$i.tmp" "$i"
+        if [[ -n "@signingUtils@" ]]; then
+            signIfRequired "$i"
+        fi
+    fi
+done