diff --git a/flake.nix b/flake.nix
index c29901a..37bc0df 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,78 +6,18 @@
   inputs.pip2nix = {
     url = "github:nix-community/pip2nix";
     flake = false;
-    # inputs.nixpkgs.follows = "nixpkgs"; # inputs.flake-utils.follows = "flake-utils";
   };
 
   outputs = {nixpkgs, flake-utils, pip2nix, ...}:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs { inherit system;
-                                config.allowBroken = true;
-                              };
-        #attrsets = pkgs.lib.attrsets;
-        #overrideFiles = (attrsets.filterAttrs (f: type: type == "regular") (builtins.readDir ./python));
-        #overridePackageNames = attrsets.mapAttrsToList (f: _:  builtins.replaceStrings [".nix"] [""] f) overrideFiles;
-        py = pkgs.callPackage ./python.nix { inherit pkgs; };
-        #  packageOverrides = pself: psuper:
-        #    attrsets.genAttrs overridePackageNames (o: pself.callPackage ./python/${o}.nix {});
-        #});
-        #newversion = python3.pkgs.newversion.overrideAttrs(old: {
-        #  propagatedBuildInputs = old.propagatedBuildInputs ++ [python3.pkgs.setuptools];
-        #});
-        assets = pkgs.callPackage ./node/frappe-assets.nix {};
-        # Source: https://github.com/frappe/frappe_docker/blob/main/resources/nginx-template.conf
-        nginx-conf = pkgs.callPackage ./nginx-erpnext-conf.nix {inherit pkgs;};
-        penv = py.buildEnv.override {
-          extraLibs = [ py.pkgs.frappe py.pkgs.erpnext ];
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            (import ./python-overlay.nix)
+            (import ./overlay.nix)
+          ];
         };
-        erpnextSrc = pkgs.callPackage ./srcs/erpnext.nix {};
-        frappeModules = pkgs.callPackage ./node/frappe-modules.nix {};
-        runErpNext = pkgs.writeShellScriptBin "runErpNext" ''
-          export PYTHON_PATH=${penv}/${py.sitePackages}
-          # The upstream installer bench CLI wants mysql in its PATH
-          export PATH=${pkgs.mariadb-client}/bin:''$PATH
-
-          hostname=localhost
-          tmp=/tmp/erpnext
-
-          mkdir -p $tmp/apps $tmp/sites $tmp/config/pids $tmp/logs/nginx $tmp/env/bin
-
-          for f in ${assets}/share/sites/*; do
-              ln -s "$f" "$tmp/sites/$(basename $f)"
-          done
-
-          cat >$tmp/sites/common_site_config.json <<EOF
-          {
-            "db_host": "localhost",
-            "db_port": 3306,
-            "db_name": "erpnext" ,
-            "db_password": "erpnext" ,
-            "redis_cache": "redis://localhost:6379?db=0",
-            "redis_queue": "redis://localhost:6379?db=1",
-            "redis_socketio": "redis://localhost:6379?db=2",
-            "socketio_port": 3000
-          }
-          EOF
-
-          # The upstream bench CLI installer expects this file
-          echo -e "erpnext\nfrappe\n" > $tmp/sites/apps.txt
-
-          ln -s ${erpnextSrc} $tmp/apps/erpnext
-          ln -s ${frappeModules}/libexec/frappe-framework/deps/frappe-framework $tmp/apps/frappe
-
-          ln -s ${penv} $tmp/env
-          ln -sf ${nginx-conf} $tmp/nginx-erpnext.conf
-
-          cd $tmp
-          # Upstream initializes the DB with this command
-          ${py.pkgs.bench}/bin/bench new-site localhost --mariadb-root-password password --admin-password admin
-          ${py.pkgs.bench}/bin/bench --site localhost install-app erpnext
-
-          echo "Workdir: $tmp"
-          ${pkgs.nodejs}/bin/node $tmp/apps/frappe/socketio.js &
-          ${penv}/bin/gunicorn --chdir="$tmp/sites" --bind=0.0.0.0:9090 --threads=4 --workers=2 --worker-class=gthread --worker-tmp-dir=/dev/shm --timeout=120 --preload frappe.app:application
-        '';
       in rec {
         packages = {
           devEnv = pkgs.buildEnv {
@@ -86,11 +26,12 @@
               pkgs.dasel
             ];
           };
-          inherit pkgs runErpNext assets;
+          inherit pkgs;
+          run-erpnext = pkgs.run-erpnext;
           pip2nix = import "${pip2nix}/default.nix" { inherit pkgs; pythonPackages = "python310Packages"; };
-          erpnext = py.pkgs.erpnext;
-          bench = py.pkgs.bench;
-          pythonPkgs = py.pkgs;
+          erpnext = pkgs.python3.pkgs.erpnext;
+          bench = pkgs.python3.pkgs.bench;
+          pythonPkgs = pkgs.python3.pkgs;
         };
     });
 }
diff --git a/nginx-erpnext-conf.nix b/nginx-erpnext-conf.nix
index 3990883..829310e 100644
--- a/nginx-erpnext-conf.nix
+++ b/nginx-erpnext-conf.nix
@@ -1,4 +1,7 @@
-{ pkgs }:
+# From https://github.com/frappe/frappe_docker/blob/main/resources/nginx-template.conf
+{ writeText
+, nginx
+}:
 let
   backend = "127.0.0.1:9090";
   socketio = "127.0.0.1:3000";
@@ -9,7 +12,7 @@ let
   client_max_body_size = "50m";
   proxy_read_timeout = "120";
 in
-pkgs.writeText "erpnext.conf" ''
+writeText "erpnext.conf" ''
 user  nginx;
 worker_processes  auto;
 
@@ -23,7 +26,7 @@ events {
 
 
 http {
-    include       ${pkgs.nginx}/conf/mime.types;
+    include       ${nginx}/conf/mime.types;
     default_type  application/octet-stream;
 
     log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
diff --git a/node/erpnext-apps-sites.nix b/node/erpnext-apps-sites.nix
new file mode 100644
index 0000000..5e243a8
--- /dev/null
+++ b/node/erpnext-apps-sites.nix
@@ -0,0 +1,68 @@
+{ fetchFromGitHub
+, fetchYarnDeps
+, runCommand
+, nodejs
+, yarn
+, path
+, nodePackages
+}:
+let
+  erpnextSrc = import ../srcs/erpnext.nix {inherit fetchFromGitHub; };
+  erpnextOfflineCache = fetchYarnDeps {
+    yarnLock = "${erpnextSrc}/yarn.lock";
+    sha256 = "sha256-Vho4BSbxcsVYExLvUaeoc3xIpbXoCUP/4jw4RwGnWGY=";
+  };
+
+  frappeSrc = import ../srcs/frappe.nix {inherit fetchFromGitHub; };
+  frappeOfflineCache = fetchYarnDeps {
+    yarnLock = "${frappeSrc}/yarn.lock";
+    sha256 = "sha256-PBdMUz9gJIoQaqQYbdk+xnd8CyZPmdeyz/9WznCb4Ss=";
+  };
+
+  # Copied from nixpkgs:pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
+  fixup_yarn_lock = runCommand "fixup_yarn_lock" {buildInputs = [ nodejs ];} ''
+    mkdir -p $out/lib
+    mkdir -p $out/bin
+
+    cp ${path}/pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/urlToName.js $out/lib/urlToName.js
+    cp ${path}/pkgs/development/tools/yarn2nix-moretea/yarn2nix/internal/fixup_yarn_lock.js $out/bin/fixup_yarn_lock
+
+    patchShebangs $out
+  '';
+
+  mkApp = name: src: yarnOfflineCache: runCommand "${name}-app" {
+    buildInputs = [fixup_yarn_lock yarn nodePackages.node-gyp-build];
+  } ''
+    mkdir -p $out/share/apps
+    cp -r ${src} $out/share/apps/${name}
+    chmod -R +w $out/share/apps/${name}
+
+    export HOME=$(mktemp -d)
+    yarn config --offline set yarn-offline-mirror ${yarnOfflineCache}
+
+    cd $out/share/apps/${name}
+    fixup_yarn_lock yarn.lock
+    yarn --offline --ignore-scripts install
+  '';
+
+  frappeApp = mkApp "frappe" frappeSrc frappeOfflineCache;
+  erpnextApp = mkApp "erpnext" erpnextSrc erpnextOfflineCache;
+
+  assets = runCommand "frappe-erpnext-assets" {buildInputs = [yarn]; } ''
+    mkdir -p $out/share/sites $out/share/apps
+
+    # Cannot symlink because the code which traverses path to find sites
+    # directory gets confused.
+    cp -r ${frappeApp}/share/apps/frappe $out/share/apps/frappe
+    cp -r ${erpnextApp}/share/apps/erpnext $out/share/apps/erpnext
+
+    cat > $out/share/sites/apps.txt <<EOF
+    frappe
+    erpnext
+    EOF
+
+    cd $out/share/apps/frappe
+    pwd
+    yarn --offline production
+  '';
+in assets
diff --git a/node/esbuild-js-fix-css-build.patch b/node/esbuild-js-fix-css-build.patch
deleted file mode 100644
index 28fc624..0000000
--- a/node/esbuild-js-fix-css-build.patch
+++ /dev/null
@@ -1,18 +0,0 @@
-diff --git a/esbuild/esbuild.js b/esbuild/esbuild.js
-index c3b59bcd9e..86af51a110 100644
---- a/esbuild/esbuild.js
-+++ b/esbuild/esbuild.js
-@@ -166,12 +166,7 @@ function build_assets_for_apps(apps, files) {
- 			files: style_file_map,
- 			outdir: output_path,
- 		});
--		let rtl_style_build = build_style_files({
--			files: rtl_style_file_map,
--			outdir: output_path,
--			rtl_style: true,
--		});
--		return Promise.all([build, style_build, rtl_style_build]);
-+		return Promise.all([build, style_build]);
- 	});
- }
- 
diff --git a/node/frappe-assets.nix b/node/frappe-assets.nix
deleted file mode 100644
index 34111a5..0000000
--- a/node/frappe-assets.nix
+++ /dev/null
@@ -1,112 +0,0 @@
-{ mkYarnPackage
-, fetchFromGitHub
-, fetchYarnDeps
-, stdenv
-}:
-let
-
-  erpnextSrc = import ../srcs/erpnext.nix {inherit fetchFromGitHub; };
-  erpnext-modules = mkYarnPackage {
-      pname = "erpnext-modules";
-      version = "14.24.3";
-
-      src = erpnextSrc;
-
-      packageJSON = ../erpnext-package.json;
-      yarnFlags = [ "--production" ];
-
-      offlineCache = fetchYarnDeps {
-        yarnLock = ../erpnext-yarn.lock;
-        hash = "sha256-Vho4BSbxcsVYExLvUaeoc3xIpbXoCUP/4jw4RwGnWGY=";
-      };
-
-      configurePhase = ''
-        ln -s $node_modules node_modules
-      '';
-
-      installPhase = ''
-        ls -alh
-        mkdir $out
-        cp -r node_modules $out/
-        ls -alh $out/
-      '';
-
-      # We only need node_modules
-      dontBuild = true;
-
-      # Do not attempt generating a tarball
-      doDist = false;
-  };
-
-  frappe-modules = mkYarnPackage rec {
-      pname = "frappe-assets";
-      version = "14.36.1";
-
-      src = import ../srcs/frappe.nix {inherit fetchFromGitHub; };
-
-      packageJSON = ../frappe-package.json;
-      yarnFlags = [ "--production" ];
-
-      offlineCache = fetchYarnDeps {
-        yarnLock = "${src}/yarn.lock";
-        hash = "sha256-PBdMUz9gJIoQaqQYbdk+xnd8CyZPmdeyz/9WznCb4Ss=";
-      };
-
-      patches = [
-        ./esbuild-js-fix-css-build.patch
-      ];
-
-      buildPhase = ''
-        runHook preBuild
-        # Yarn writes cache directories etc to $HOME.
-        export HOME=$PWD/yarn_home
-
-        # The upstream build script reads sites/apps.txt to define what assets to build
-        # A list of assets is written to sites/assets/assets.json
-        mkdir -p apps sites/assets
-
-        cp -r "${erpnextSrc}/erpnext/public" "sites/assets/erpnext"
-        cp -r "$src/frappe/public" "sites/assets/frappe"
-
-        # The upstream esbuild script expects this file and will build assets
-        # for all listed apps
-        echo -e "erpnext\nfrappe\n" > sites/apps.txt
-
-        cp -r ${erpnextSrc} apps/erpnext
-        cp -r $src apps/frappe
-
-        chmod u+rw apps/erpnext
-        chmod u+rw apps/frappe
-        chmod -R u+rw sites/assets/erpnext
-        chmod -R u+rw sites/assets/frappe
-
-        cp -r ${erpnext-modules}/node_modules apps/erpnext/node_modules
-        cp -r $node_modules apps/frappe/node_modules
-
-        yarn --offline production
-
-        # Frappe expects node_modules linked to this directory
-        ln -s ${erpnext-modules}/node_modules sites/assets/erpnext/node_modules
-        ln -s $node_modules sites/assets/frappe/node_modules
-
-        # Clean up
-        rm sites/apps.txt
-
-        mv sites deps/
-
-        runHook postBuild
-      '';
-
-      # Do not attempt generating a tarball
-      doDist = false;
-  };
-  frappe-assets = stdenv.mkDerivation {
-    pname = "erpnext-assets";
-    version = "14.24.3";
-    phases = [ "installPhase" ];
-    installPhase = ''
-    mkdir -p $out/share
-    cp -r "${frappe-modules}/libexec/frappe-framework/deps/sites/" $out/share/sites
-    '';
-  };
-in frappe-assets
diff --git a/node/frappe-modules.nix b/node/frappe-modules.nix
deleted file mode 100644
index 5003195..0000000
--- a/node/frappe-modules.nix
+++ /dev/null
@@ -1,21 +0,0 @@
-{ mkYarnPackage
-, fetchFromGitHub
-, fetchYarnDeps
-}:
-mkYarnPackage {
-  pname = "frappe-modules";
-  version = "14.36.1";
-
-  src = import ../srcs/frappe.nix {inherit fetchFromGitHub; };
-
-  packageJSON = ../frappe-package.json;
-  yarnFlags = [ "--production" ];
-
-  offlineCache = fetchYarnDeps {
-    yarnLock = "$src/yarn.lock";
-    hash = "sha256-PBdMUz9gJIoQaqQYbdk+xnd8CyZPmdeyz/9WznCb4Ss=";
-  };
-
-  # Do not attempt generating a tarball
-  doDist = false;
-}
diff --git a/overlay.nix b/overlay.nix
new file mode 100644
index 0000000..8925d74
--- /dev/null
+++ b/overlay.nix
@@ -0,0 +1,5 @@
+self: super: {
+  run-erpnext = self.callPackage ./scripts/run-erpnext.nix {};
+  erpnext-apps-sites = self.callPackage ./node/erpnext-apps-sites.nix {};
+  erpnext-nginx-conf = self.callPackage ./nginx-erpnext-conf.nix {};
+}
diff --git a/python-overlay.nix b/python-overlay.nix
new file mode 100644
index 0000000..da76514
--- /dev/null
+++ b/python-overlay.nix
@@ -0,0 +1,127 @@
+self: super: {
+  python3 = super.python3.override {
+    packageOverrides = pyself: pysuper: {
+      bench = pyself.callPackage ./python/bench.nix {};
+      erpnext = pyself.callPackage ./python/erpnext.nix {};
+      frappe = pyself.callPackage ./python/frappe.nix {};
+
+      email-reply-parser = pyself.callPackage ./python/email-reply-parser.nix {};
+      git-url-parse = pyself.callPackage ./python/git-url-parse.nix {};
+      gocardless-pro = pyself.callPackage ./python/gocardless-pro.nix {};
+      honcho = pyself.callPackage ./python/honcho.nix {};
+      jsonobject = pyself.callPackage ./python/jsonobject.nix {};
+      maxminddb-geolite2 = pyself.callPackage ./python/maxminddb-geolite2.nix {};
+      posthog = pyself.callPackage ./python/posthog.nix {};
+      psycopg2-binary = pyself.callPackage ./python/psycopg2-binary.nix {};
+      pypdf2 = pyself.callPackage ./python/pypdf2.nix {};
+      pypika = pyself.callPackage ./python/pypika.nix {};
+      python-youtube = pyself.callPackage ./python/python-youtube.nix {};
+      rauth = pyself.callPackage ./python/rauth.nix {};
+      redisearch = pyself.callPackage ./python/redisearch.nix {};
+      rejson = pyself.callPackage ./python/rejson.nix {};
+      taxjar = pyself.callPackage ./python/taxjar.nix {};
+      traceback-with-variables = pyself.callPackage ./python/traceback-with-variables.nix {};
+
+      barcodenumber = pysuper.barcodenumber.overridePythonAttrs (oldAttrs: (rec {
+        version = "0.5.0";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-VZfHLwSF9aDoy5L1x4O2mu8/f2ijYKgyjCrQ1KKY5Ho=";
+        };
+      }));
+      bleach = pysuper.bleach.overridePythonAttrs (oldAttrs: (rec {
+        version = "3.3.1";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-MGSDpal5VHQWCtV/zj3dG1BVHpge7Y4VpYLTTO8oqvo=";
+        };
+      }));
+      phonenumbers = pysuper.phonenumbers.overridePythonAttrs (oldAttrs: (rec {
+        version = "8.12.40";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-APKVWkVrRY+barDSQykEnD5zWMRN/Bl5/kkIztQPHrg=";
+        };
+      }));
+      plaid-python = pysuper.plaid-python.overridePythonAttrs (oldAttrs: (rec {
+        version = "7.2.1";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-ryrTJug3fIyG2XGE9gwL5BzXH1B1IB39szMcyF1N5RM=";
+        };
+        propagatedBuildInputs = [ pysuper.requests ];
+        checkInputs = [ pysuper.pytest ];
+        # Integration tests require API keys and internet access
+        checkPhase = "py.test -rxs ./tests/unit";
+      }));
+      pycountry = pysuper.pycountry.overridePythonAttrs (oldAttrs: (rec {
+        version = "20.7.3";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-gQhKU9NFQ0TAKS3uvCD80KFIjBNtSQAxLL1GXPVSy0I=";
+        };
+      }));
+      pymysql = pysuper.pymysql.overridePythonAttrs (oldAttrs: (rec {
+        version = "1.0.3";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-PdqUPvNpQGinXWnQcXVdvsrO4a35ofxbIGgw0rZ9Jeg=";
+        };
+        format = "pyproject";
+        buildInputs = [pysuper.setuptools];
+      }));
+      pypng = pysuper.pypng.overridePythonAttrs (oldAttrs: (rec {
+        version = "0.20220715.0";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-c5xDO6lvB4MV3lTA25da7lN8vD4dCuTtmqsMoeQn4sE=";
+        };
+      }));
+      pytz = pysuper.pytz.overridePythonAttrs (oldAttrs: (rec {
+        version = "2022.1";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-HnYOL+aoFjvAs9mhnE+ENCr6Cir/6/qoSwG5eKAuyqc=";
+        };
+      }));
+      redis = pysuper.redis.overridePythonAttrs (oldAttrs: (rec {
+        version = "3.5.3";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-Dn4M/KhmDeqLfVzYxPbF4p4R8xFYwLCukaOX8A5aBaI=";
+        };
+        pythonImportsCheck = [];
+        # tests require a running redis
+        doCheck = false;
+      }));
+      tweepy = pysuper.tweepy.overridePythonAttrs (oldAttrs: (rec {
+        version = "3.10.0";
+        src = pysuper.fetchPypi {
+          inherit version;
+          inherit (oldAttrs) pname;
+          sha256 = "sha256-duaVS4BspHDdqHf1fbh5L/8GoL66DtQ+/DgFdx458Go=";
+        };
+        doCheck = false;
+        pythonImportsCheck = [];
+      }));
+      unidecode = pysuper.unidecode.overridePythonAttrs (oldAttrs: (rec {
+        version = "1.2.0";
+        src = pysuper.fetchPypi {
+          inherit version;
+          pname = "Unidecode";
+          sha256 = "sha256-jXOpfTh6lWkiNE9rdCQ8LGdxWUZZd4dEstvarY9rcn0=";
+        };
+      }));
+    };
+  };
+}
+
diff --git a/python.nix b/python.nix
deleted file mode 100644
index d6b6fc7..0000000
--- a/python.nix
+++ /dev/null
@@ -1,127 +0,0 @@
-{ pkgs }:
-
-pkgs.python3.override {
-  packageOverrides = self: super: {
-    bench = self.callPackage ./python/bench.nix {};
-    erpnext = self.callPackage ./python/erpnext.nix {};
-    frappe = self.callPackage ./python/frappe.nix {};
-
-    email-reply-parser = self.callPackage ./python/email-reply-parser.nix {};
-    git-url-parse = self.callPackage ./python/git-url-parse.nix {};
-    gocardless-pro = self.callPackage ./python/gocardless-pro.nix {};
-    honcho = self.callPackage ./python/honcho.nix {};
-    jsonobject = self.callPackage ./python/jsonobject.nix {};
-    maxminddb-geolite2 = self.callPackage ./python/maxminddb-geolite2.nix {};
-    posthog = self.callPackage ./python/posthog.nix {};
-    psycopg2-binary = self.callPackage ./python/psycopg2-binary.nix {};
-    pypdf2 = self.callPackage ./python/pypdf2.nix {};
-    pypika = self.callPackage ./python/pypika.nix {};
-    python-youtube = self.callPackage ./python/python-youtube.nix {};
-    rauth = self.callPackage ./python/rauth.nix {};
-    redisearch = self.callPackage ./python/redisearch.nix {};
-    rejson = self.callPackage ./python/rejson.nix {};
-    taxjar = self.callPackage ./python/taxjar.nix {};
-    traceback-with-variables = self.callPackage ./python/traceback-with-variables.nix {};
-
-    barcodenumber = super.barcodenumber.overridePythonAttrs (oldAttrs: (rec {
-      version = "0.5.0";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-VZfHLwSF9aDoy5L1x4O2mu8/f2ijYKgyjCrQ1KKY5Ho=";
-      };
-    }));
-    bleach = super.bleach.overridePythonAttrs (oldAttrs: (rec {
-      version = "3.3.1";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-MGSDpal5VHQWCtV/zj3dG1BVHpge7Y4VpYLTTO8oqvo=";
-      };
-    }));
-    phonenumbers = super.phonenumbers.overridePythonAttrs (oldAttrs: (rec {
-    version = "8.12.40";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-APKVWkVrRY+barDSQykEnD5zWMRN/Bl5/kkIztQPHrg=";
-      };
-    }));
-    plaid-python = super.plaid-python.overridePythonAttrs (oldAttrs: (rec {
-      version = "7.2.1";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-ryrTJug3fIyG2XGE9gwL5BzXH1B1IB39szMcyF1N5RM=";
-      };
-      propagatedBuildInputs = [ super.requests ];
-      checkInputs = [ super.pytest ];
-      # Integration tests require API keys and internet access
-      checkPhase = "py.test -rxs ./tests/unit";
-    }));
-    pycountry = super.pycountry.overridePythonAttrs (oldAttrs: (rec {
-      version = "20.7.3";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-gQhKU9NFQ0TAKS3uvCD80KFIjBNtSQAxLL1GXPVSy0I=";
-      };
-    }));
-    pymysql = super.pymysql.overridePythonAttrs (oldAttrs: (rec {
-      version = "1.0.3";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-PdqUPvNpQGinXWnQcXVdvsrO4a35ofxbIGgw0rZ9Jeg=";
-      };
-      format = "pyproject";
-      buildInputs = [super.setuptools];
-    }));
-    pypng = super.pypng.overridePythonAttrs (oldAttrs: (rec {
-      version = "0.20220715.0";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-c5xDO6lvB4MV3lTA25da7lN8vD4dCuTtmqsMoeQn4sE=";
-      };
-    }));
-    pytz = super.pytz.overridePythonAttrs (oldAttrs: (rec {
-      version = "2022.1";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-HnYOL+aoFjvAs9mhnE+ENCr6Cir/6/qoSwG5eKAuyqc=";
-      };
-    }));
-    redis = super.redis.overridePythonAttrs (oldAttrs: (rec {
-      version = "3.5.3";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-Dn4M/KhmDeqLfVzYxPbF4p4R8xFYwLCukaOX8A5aBaI=";
-      };
-      pythonImportsCheck = [];
-      # tests require a running redis
-      doCheck = false;
-    }));
-    tweepy = super.tweepy.overridePythonAttrs (oldAttrs: (rec {
-      version = "3.10.0";
-      src = super.fetchPypi {
-        inherit version;
-        inherit (oldAttrs) pname;
-        sha256 = "sha256-duaVS4BspHDdqHf1fbh5L/8GoL66DtQ+/DgFdx458Go=";
-      };
-      doCheck = false;
-      pythonImportsCheck = [];
-    }));
-    unidecode = super.unidecode.overridePythonAttrs (oldAttrs: (rec {
-      version = "1.2.0";
-      src = super.fetchPypi {
-        inherit version;
-        pname = "Unidecode";
-        sha256 = "sha256-jXOpfTh6lWkiNE9rdCQ8LGdxWUZZd4dEstvarY9rcn0=";
-      };
-    }));
-  };
-}
-
diff --git a/scripts/run-erpnext.nix b/scripts/run-erpnext.nix
new file mode 100644
index 0000000..bd08e0f
--- /dev/null
+++ b/scripts/run-erpnext.nix
@@ -0,0 +1,58 @@
+{ mariadb-client
+, python3
+, nodejs
+, writeShellApplication
+, erpnext-apps-sites
+, erpnext-nginx-conf
+}:
+let
+  penv = python3.buildEnv.override {
+    extraLibs = [
+      python3.pkgs.frappe
+      python3.pkgs.erpnext
+      python3.pkgs.bench
+    ];
+  };
+in writeShellApplication {
+  name = "run-erpnext";
+  runtimeInputs = [mariadb-client nodejs penv];
+  text = ''
+    export PYTHON_PATH=${penv}/${python3.sitePackages}
+
+    tmp=/tmp/erpnext
+
+    mkdir -p $tmp/sites $tmp/config/pids $tmp/logs/nginx $tmp/env/bin
+
+    ln -s ${erpnext-apps-sites}/share/apps $tmp/apps
+
+    for f in ${erpnext-apps-sites}/share/sites/*; do
+        ln -s "$f" "$tmp/sites/$(basename "$f")"
+    done
+
+    cat >$tmp/sites/common_site_config.json <<EOF
+    {
+      "db_host": "localhost",
+      "db_port": 3306,
+      "db_name": "erpnext" ,
+      "db_password": "erpnext" ,
+      "redis_cache": "redis://localhost:6379?db=0",
+      "redis_queue": "redis://localhost:6379?db=1",
+      "redis_socketio": "redis://localhost:6379?db=2",
+      "socketio_port": 3000
+    }
+    EOF
+
+    ln -s ${penv} $tmp/env
+    ln -sf ${erpnext-nginx-conf} $tmp/nginx-erpnext.conf
+
+    cd $tmp
+
+    # Upstream initializes the DB with this command
+    bench new-site localhost --mariadb-root-password password --admin-password admin
+    bench --site localhost install-app erpnext
+
+    echo "Workdir: $tmp"
+    node $tmp/apps/frappe/socketio.js &
+    gunicorn --chdir="$tmp/sites" --bind=0.0.0.0:9090 --threads=4 --workers=2 --worker-class=gthread --worker-tmp-dir=/dev/shm --timeout=120 --preload frappe.app:application
+  '';
+}