diff --git a/overlay/default.nix b/overlay/default.nix
index 9e0b45c..8bd0b1d 100644
--- a/overlay/default.nix
+++ b/overlay/default.nix
@@ -264,6 +264,8 @@ in nullPkgs // {
     popt = null;
   } (overrideAttrsHost (_: { outputs = [ "out" "man" ]; }) rsync);
 
+  sculptUtils = callPackage ./sculpt-utils { };
+
   solo5-tools = callPackage ./solo5-tools { };
 
   stdenv = if prev.stdenv.hostPlatform.isGenode then
diff --git a/overlay/sculpt-utils/default.nix b/overlay/sculpt-utils/default.nix
new file mode 100644
index 0000000..d8b53e2
--- /dev/null
+++ b/overlay/sculpt-utils/default.nix
@@ -0,0 +1,110 @@
+{ lib, hostPlatform, dhall, libxml2, runCommand, xz }:
+
+let arch = hostPlatform.uname.processor;
+in rec {
+
+  storeVersion = builtins.substring 11 7;
+
+  buildBinArchive = inputPkg:
+    runCommand "bin-${arch}-${inputPkg.pname}-${inputPkg.version}" (rec {
+      inherit arch inputPkg;
+      inherit (inputPkg) pname;
+      version = builtins.substring 11 7 inputPkg;
+      nativeBuildInputs = [ dhall xz ];
+      depotPath = "bin/${arch}/${pname}/${version}";
+      srcPath = "src/${pname}/${version}";
+    }) ''
+      mkdir -p archive/$version $out/bin/$arch/$pname
+      pushd archive/$version
+      export XDG_CACHE_HOME=$NIX_BUILD_TOP
+      eval $(echo "${
+        ./generate-manifest-link-script.dhall
+      } (toMap $inputPkg/nix-support/eris-manifest.dhall)" | dhall text)
+      # Need copies of truncated URNs because various Genode subsystems do this
+      for urn in urn:eris:*
+      do
+        cp ''${urn} ''${urn:0:63}
+        cp ''${urn} ''${urn:0:59}
+      done
+      popd
+      pushd archive
+      tar -c --xz -f $out/$depotPath.tar.xz --dereference .
+      popd
+    '';
+
+  buildIndex = { release, supportsArch, indexes }:
+    let
+      supportsArch' =
+        lib.strings.concatMapStrings (arch: ''<supports arch="${arch}"/>'')
+        supportsArch;
+
+      pkgToString = { info, path }: ''<pkg info="${info}" path="${path}"/>'';
+      indexToString = name:
+        { pkgs }:
+        ''<index name="${name}">${toString (map pkgToString pkgs)}</index>'';
+
+      indexes' = toString (lib.attrsets.mapAttrsToList indexToString indexes);
+
+    in runCommand "index-${release}" { nativeBuildInputs = [ libxml2 ]; } ''
+      mkdir -p $out/index
+      xmllint -format - << EOF | xz > $out/index/${release}.xz
+      <index>
+      ${supportsArch'}
+      ${indexes'}
+      </index>
+
+      EOF
+    '';
+
+  tagLabelToString = { tag, label ? null }:
+    "<${tag} ${lib.optionalString (label != null) ''label="${label}"''}/>";
+
+  runtimeToString = { binary, caps, ram, requires ? [ ], content ? [ ]
+    , config ? "<config/>", provides ? [ ] }:
+    ''
+      <runtime binary="${binary}" caps="${toString caps}" ram="${toString ram}">
+    ''
+
+    + (lib.optionalString (requires != [ ]) ''
+      <requires>${toString (map tagLabelToString requires)}</requires>
+    '')
+
+    + (lib.optionalString (provides != [ ]) ''
+      <provides>${toString (map (p: "<${p}/>") provides)}</provides>
+    '')
+
+    + (lib.optionalString (content != [ ]) ''
+      <content>${toString (map tagLabelToString content)}</content>
+    '')
+
+    + ''
+      ${config}
+      </runtime>
+    '';
+
+  buildPkg = { pname, archives, runtime }:
+    let
+      drv = runCommand "pkg-${pname}" {
+        inherit pname;
+        nativeBuildInputs = [ libxml2 xz ];
+      } ''
+        export version=''${out:11:7}
+        mkdir -p $version
+        awk 'NF' << EOF > $version/archives
+        ${lib.strings.concatMapStrings (s: s + "\n") archives}
+        EOF
+
+        xmllint -format - << EOF > $version/runtime
+        ${runtimeToString runtime}
+
+        EOF
+
+        mkdir -p $out/pkg/$pname
+        tar -c --xz -f $out/pkg/$pname/$version.tar.xz $version
+      '';
+    in drv // (rec {
+      version = storeVersion drv;
+      depotPath = "pkg/${drv.pname}/${version}";
+    });
+
+}
diff --git a/overlay/sculpt-utils/generate-manifest-link-script.dhall b/overlay/sculpt-utils/generate-manifest-link-script.dhall
new file mode 100644
index 0000000..c7e06f4
--- /dev/null
+++ b/overlay/sculpt-utils/generate-manifest-link-script.dhall
@@ -0,0 +1,25 @@
+let ClosureEntry = { cap : Text, path : Text }
+
+let Entry =
+      { mapKey : Text, mapValue : { cap : Text, closure : List ClosureEntry } }
+
+in  λ(manifest : List Entry) →
+      List/fold
+        Entry
+        manifest
+        Text
+        ( λ(entry : Entry) →
+          λ(script : Text) →
+            ''
+              ${List/fold
+                  ClosureEntry
+                  entry.mapValue.closure
+                  Text
+                  ( λ(entry : ClosureEntry) →
+                    λ(script : Text) →
+                      "cp -u ${entry.path} ${entry.cap}; ${script}"
+                  )
+                  "true;"} cp ${entry.mapValue.cap} ${entry.mapKey}; ${script}
+            ''
+        )
+        "true"