modules: init betanin module

modules/default.nix

@@ -2,6 +2,7 @@
   amdgpu-common = ./services/hardware/amdgpu-common.nix;
   amdgpu-fan = ./services/hardware/amdgpu-fan.nix;
   amdgpu-pwm = ./services/hardware/amdgpu-pwm.nix;
+  betanin = ./services/web-apps/betanin.nix;
   dunst = ./services/x11/dunst.nix;
   radeon-profile-daemon = ./services/hardware/radeon-profile-daemon.nix;
 }

modules/services/web-apps/betanin.nix

@@ -0,0 +1,114 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkIf mkOption optionalAttrs types;
+  cfg = config.services.betanin;
+
+  yaml = pkgs.formats.yaml { };
+  configFile =
+    if (cfg.beetsConfigFile != null)
+    then cfg.beetsConfigFile
+    else yaml.generate "beets-config.yaml" cfg.beetsConfig;
+
+  defaultUser = "betanin";
+  defaultGroup = "betanin";
+in
+{
+  options = {
+    services.betanin = {
+      enable = lib.mkEnableOption "betanin";
+
+      package = mkOption {
+        description = "Package containing betanin program.";
+        type = types.package;
+        default = pkgs.betanin or (import ../../.. { inherit pkgs; }).betanin;
+      };
+
+      openFirewall = mkOption {
+        description = "Open ports in the firewall for the server.";
+        type = types.bool;
+        default = false;
+      };
+
+      port = mkOption {
+        description = "Port to access betanin on.";
+        type = types.port;
+        default = 9393;
+      };
+
+      user = mkOption {
+        description = "User that the betanin program should run under.";
+        type = types.str;
+        default = defaultUser;
+      };
+
+      group = mkOption {
+        description = "Group that the betanin program should run under.";
+        type = types.str;
+        default = defaultGroup;
+      };
+
+      dataDir = mkOption {
+        description = "Directory to store application data.";
+        type = types.str;
+        default = "/var/lib/betanin";
+      };
+
+      beetsConfig = mkOption {
+        description = "beets configuration.";
+        type = yaml.type;
+        default = { };
+      };
+
+      beetsConfigFile = mkOption {
+        description = "beets configuration file.";
+        type = nullOr (either str path);
+        default = null;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = (cfg.beetsConfig == { }) != (cfg.beetsConfigFile == null);
+      message = "either services.betanin.beetsConfig or services.betanin.beetsConfigFile is required";
+    }];
+
+    networking.firwall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ cfg.port ];
+    };
+
+    systemd.services.betanin = {
+      description = "Betanin service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "networking.target" ];
+      environment = {
+        HOME = cfg.dataDir;
+      };
+      serviceConfig = lib.mkMerge [
+        {
+          User = cfg.user;
+          Group = cfg.group;
+          ExecStart = "${cfg.package}/bin/betanin --port ${cfg.port}";
+          PrivateTmp = true;
+          Restart = "always";
+          WorkingDirectory = cfg.dataDir;
+        }
+        (mkIf (cfg.dataDir == "/var/lib/betanin") {
+          StateDirectory = "betanin";
+        })
+      ];
+    };
+
+    users.users = optionalAttrs (cfg.user == defaultUser) {
+      ${cfg.user} = {
+        isSystemUser = true;
+        group = cfg.group;
+      };
+    };
+
+    users.groups = optionalAttrs (cfg.group == defaultGroup) {
+      ${cfg.group} = { };
+    };
+  };
+}

pkgs/by-name/be/betanin/client/composition.nix

@@ -0,0 +1,17 @@
+# This file has been generated by node2nix 1.11.1. Do not edit!
+
+{pkgs ? import <nixpkgs> {
+    inherit system;
+  }, system ? builtins.currentSystem, nodejs ? pkgs."nodejs_18"}:
+
+let
+  nodeEnv = import ./node-env.nix {
+    inherit (pkgs) stdenv lib python2 runCommand writeTextFile writeShellScript;
+    inherit pkgs nodejs;
+    libtool = if pkgs.stdenv.isDarwin then pkgs.darwin.cctools else null;
+  };
+in
+import ./packages.nix {
+  inherit (pkgs) fetchurl nix-gitignore stdenv lib fetchgit;
+  inherit nodeEnv;
+}

pkgs/by-name/be/betanin/client/default.nix

@@ -0,0 +1,21 @@
+{ pkgs
+, stdenv
+, src
+, version
+}:
+
+let
+  nodeComposition = import ./composition.nix {
+    inherit pkgs;
+    inherit (stdenv.hostPlatform) system;
+  };
+in
+nodeComposition.package.override {
+  pname = "betanin";
+  inherit version;
+  src = "${src}/betanin_client";
+
+  postInstall = ''
+    PRODUCTION=true npm run-script build
+  '';
+}

pkgs/by-name/be/betanin/client/generate.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# Requires node2nix and jq
+
+cd "$(dirname "$0")" || exit 1
+
+set -euo pipefail
+
+nix build ..#betanin.src 2>/dev/null
+
+tempDir=$(mktemp -d)
+cp result/betanin_client/package.json "$tempDir/"
+cp result/betanin_client/package-lock.json "$tempDir/"
+pushd "$tempDir"
+
+node2nix \
+    --input package.json \
+    --lock package-lock.json \
+    --output packages.nix \
+    --composition composition.nix \
+    --strip-optional-dependencies \
+    --development \
+    --nodejs-18
+
+popd
+cp "$tempDir"/*.nix .
+
+rm result
+rm -rf "$tempDir"

pkgs/by-name/be/betanin/client/node-env.nix

@@ -0,0 +1,689 @@
+# This file originates from node2nix
+
+{lib, stdenv, nodejs, python2, pkgs, libtool, runCommand, writeTextFile, writeShellScript}:
+
+let
+  # Workaround to cope with utillinux in Nixpkgs 20.09 and util-linux in Nixpkgs master
+  utillinux = if pkgs ? utillinux then pkgs.utillinux else pkgs.util-linux;
+
+  python = if nodejs ? python then nodejs.python else python2;
+
+  # Create a tar wrapper that filters all the 'Ignoring unknown extended header keyword' noise
+  tarWrapper = runCommand "tarWrapper" {} ''
+    mkdir -p $out/bin
+
+    cat > $out/bin/tar <<EOF
+    #! ${stdenv.shell} -e
+    $(type -p tar) "\$@" --warning=no-unknown-keyword --delay-directory-restore
+    EOF
+
+    chmod +x $out/bin/tar
+  '';
+
+  # Function that generates a TGZ file from a NPM project
+  buildNodeSourceDist =
+    { name, version, src, ... }:
+
+    stdenv.mkDerivation {
+      name = "node-tarball-${name}-${version}";
+      inherit src;
+      buildInputs = [ nodejs ];
+      buildPhase = ''
+        export HOME=$TMPDIR
+        tgzFile=$(npm pack | tail -n 1) # Hooks to the pack command will add output (https://docs.npmjs.com/misc/scripts)
+      '';
+      installPhase = ''
+        mkdir -p $out/tarballs
+        mv $tgzFile $out/tarballs
+        mkdir -p $out/nix-support
+        echo "file source-dist $out/tarballs/$tgzFile" >> $out/nix-support/hydra-build-products
+      '';
+    };
+
+  # Common shell logic
+  installPackage = writeShellScript "install-package" ''
+    installPackage() {
+      local packageName=$1 src=$2
+
+      local strippedName
+
+      local DIR=$PWD
+      cd $TMPDIR
+
+      unpackFile $src
+
+      # Make the base dir in which the target dependency resides first
+      mkdir -p "$(dirname "$DIR/$packageName")"
+
+      if [ -f "$src" ]
+      then
+          # Figure out what directory has been unpacked
+          packageDir="$(find . -maxdepth 1 -type d | tail -1)"
+
+          # Restore write permissions to make building work
+          find "$packageDir" -type d -exec chmod u+x {} \;
+          chmod -R u+w "$packageDir"
+
+          # Move the extracted tarball into the output folder
+          mv "$packageDir" "$DIR/$packageName"
+      elif [ -d "$src" ]
+      then
+          # Get a stripped name (without hash) of the source directory.
+          # On old nixpkgs it's already set internally.
+          if [ -z "$strippedName" ]
+          then
+              strippedName="$(stripHash $src)"
+          fi
+
+          # Restore write permissions to make building work
+          chmod -R u+w "$strippedName"
+
+          # Move the extracted directory into the output folder
+          mv "$strippedName" "$DIR/$packageName"
+      fi
+
+      # Change to the package directory to install dependencies
+      cd "$DIR/$packageName"
+    }
+  '';
+
+  # Bundle the dependencies of the package
+  #
+  # Only include dependencies if they don't exist. They may also be bundled in the package.
+  includeDependencies = {dependencies}:
+    lib.optionalString (dependencies != []) (
+      ''
+        mkdir -p node_modules
+        cd node_modules
+      ''
+      + (lib.concatMapStrings (dependency:
+        ''
+          if [ ! -e "${dependency.packageName}" ]; then
+              ${composePackage dependency}
+          fi
+        ''
+      ) dependencies)
+      + ''
+        cd ..
+      ''
+    );
+
+  # Recursively composes the dependencies of a package
+  composePackage = { name, packageName, src, dependencies ? [], ... }@args:
+    builtins.addErrorContext "while evaluating node package '${packageName}'" ''
+      installPackage "${packageName}" "${src}"
+      ${includeDependencies { inherit dependencies; }}
+      cd ..
+      ${lib.optionalString (builtins.substring 0 1 packageName == "@") "cd .."}
+    '';
+
+  pinpointDependencies = {dependencies, production}:
+    let
+      pinpointDependenciesFromPackageJSON = writeTextFile {
+        name = "pinpointDependencies.js";
+        text = ''
+          var fs = require('fs');
+          var path = require('path');
+
+          function resolveDependencyVersion(location, name) {
+              if(location == process.env['NIX_STORE']) {
+                  return null;
+              } else {
+                  var dependencyPackageJSON = path.join(location, "node_modules", name, "package.json");
+
+                  if(fs.existsSync(dependencyPackageJSON)) {
+                      var dependencyPackageObj = JSON.parse(fs.readFileSync(dependencyPackageJSON));
+
+                      if(dependencyPackageObj.name == name) {
+                          return dependencyPackageObj.version;
+                      }
+                  } else {
+                      return resolveDependencyVersion(path.resolve(location, ".."), name);
+                  }
+              }
+          }
+
+          function replaceDependencies(dependencies) {
+              if(typeof dependencies == "object" && dependencies !== null) {
+                  for(var dependency in dependencies) {
+                      var resolvedVersion = resolveDependencyVersion(process.cwd(), dependency);
+
+                      if(resolvedVersion === null) {
+                          process.stderr.write("WARNING: cannot pinpoint dependency: "+dependency+", context: "+process.cwd()+"\n");
+                      } else {
+                          dependencies[dependency] = resolvedVersion;
+                      }
+                  }
+              }
+          }
+
+          /* Read the package.json configuration */
+          var packageObj = JSON.parse(fs.readFileSync('./package.json'));
+
+          /* Pinpoint all dependencies */
+          replaceDependencies(packageObj.dependencies);
+          if(process.argv[2] == "development") {
+              replaceDependencies(packageObj.devDependencies);
+          }
+          else {
+              packageObj.devDependencies = {};
+          }
+          replaceDependencies(packageObj.optionalDependencies);
+          replaceDependencies(packageObj.peerDependencies);
+
+          /* Write the fixed package.json file */
+          fs.writeFileSync("package.json", JSON.stringify(packageObj, null, 2));
+        '';
+      };
+    in
+    ''
+      node ${pinpointDependenciesFromPackageJSON} ${if production then "production" else "development"}
+
+      ${lib.optionalString (dependencies != [])
+        ''
+          if [ -d node_modules ]
+          then
+              cd node_modules
+              ${lib.concatMapStrings (dependency: pinpointDependenciesOfPackage dependency) dependencies}
+              cd ..
+          fi
+        ''}
+    '';
+
+  # Recursively traverses all dependencies of a package and pinpoints all
+  # dependencies in the package.json file to the versions that are actually
+  # being used.
+
+  pinpointDependenciesOfPackage = { packageName, dependencies ? [], production ? true, ... }@args:
+    ''
+      if [ -d "${packageName}" ]
+      then
+          cd "${packageName}"
+          ${pinpointDependencies { inherit dependencies production; }}
+          cd ..
+          ${lib.optionalString (builtins.substring 0 1 packageName == "@") "cd .."}
+      fi
+    '';
+
+  # Extract the Node.js source code which is used to compile packages with
+  # native bindings
+  nodeSources = runCommand "node-sources" {} ''
+    tar --no-same-owner --no-same-permissions -xf ${nodejs.src}
+    mv node-* $out
+  '';
+
+  # Script that adds _integrity fields to all package.json files to prevent NPM from consulting the cache (that is empty)
+  addIntegrityFieldsScript = writeTextFile {
+    name = "addintegrityfields.js";
+    text = ''
+      var fs = require('fs');
+      var path = require('path');
+
+      function augmentDependencies(baseDir, dependencies) {
+          for(var dependencyName in dependencies) {
+              var dependency = dependencies[dependencyName];
+
+              // Open package.json and augment metadata fields
+              var packageJSONDir = path.join(baseDir, "node_modules", dependencyName);
+              var packageJSONPath = path.join(packageJSONDir, "package.json");
+
+              if(fs.existsSync(packageJSONPath)) { // Only augment packages that exist. Sometimes we may have production installs in which development dependencies can be ignored
+                  console.log("Adding metadata fields to: "+packageJSONPath);
+                  var packageObj = JSON.parse(fs.readFileSync(packageJSONPath));
+
+                  if(dependency.integrity) {
+                      packageObj["_integrity"] = dependency.integrity;
+                  } else {
+                      packageObj["_integrity"] = "sha1-000000000000000000000000000="; // When no _integrity string has been provided (e.g. by Git dependencies), add a dummy one. It does not seem to harm and it bypasses downloads.
+                  }
+
+                  if(dependency.resolved) {
+                      packageObj["_resolved"] = dependency.resolved; // Adopt the resolved property if one has been provided
+                  } else {
+                      packageObj["_resolved"] = dependency.version; // Set the resolved version to the version identifier. This prevents NPM from cloning Git repositories.
+                  }
+
+                  if(dependency.from !== undefined) { // Adopt from property if one has been provided
+                      packageObj["_from"] = dependency.from;
+                  }
+
+                  fs.writeFileSync(packageJSONPath, JSON.stringify(packageObj, null, 2));
+              }
+
+              // Augment transitive dependencies
+              if(dependency.dependencies !== undefined) {
+                  augmentDependencies(packageJSONDir, dependency.dependencies);
+              }
+          }
+      }
+
+      if(fs.existsSync("./package-lock.json")) {
+          var packageLock = JSON.parse(fs.readFileSync("./package-lock.json"));
+
+          if(![1, 2].includes(packageLock.lockfileVersion)) {
+            process.stderr.write("Sorry, I only understand lock file versions 1 and 2!\n");
+            process.exit(1);
+          }
+
+          if(packageLock.dependencies !== undefined) {
+              augmentDependencies(".", packageLock.dependencies);
+          }
+      }
+    '';
+  };
+
+  # Reconstructs a package-lock file from the node_modules/ folder structure and package.json files with dummy sha1 hashes
+  reconstructPackageLock = writeTextFile {
+    name = "reconstructpackagelock.js";
+    text = ''
+      var fs = require('fs');
+      var path = require('path');
+
+      var packageObj = JSON.parse(fs.readFileSync("package.json"));
+
+      var lockObj = {
+          name: packageObj.name,
+          version: packageObj.version,
+          lockfileVersion: 2,
+          requires: true,
+          packages: {
+              "": {
+                  name: packageObj.name,
+                  version: packageObj.version,
+                  license: packageObj.license,
+                  bin: packageObj.bin,
+                  dependencies: packageObj.dependencies,
+                  engines: packageObj.engines,
+                  optionalDependencies: packageObj.optionalDependencies
+              }
+          },
+          dependencies: {}
+      };
+
+      function augmentPackageJSON(filePath, packages, dependencies) {
+          var packageJSON = path.join(filePath, "package.json");
+          if(fs.existsSync(packageJSON)) {
+              var packageObj = JSON.parse(fs.readFileSync(packageJSON));
+              packages[filePath] = {
+                  version: packageObj.version,
+                  integrity: "sha1-000000000000000000000000000=",
+                  dependencies: packageObj.dependencies,
+                  engines: packageObj.engines,
+                  optionalDependencies: packageObj.optionalDependencies
+              };
+              dependencies[packageObj.name] = {
+                  version: packageObj.version,
+                  integrity: "sha1-000000000000000000000000000=",
+                  dependencies: {}
+              };
+              processDependencies(path.join(filePath, "node_modules"), packages, dependencies[packageObj.name].dependencies);
+          }
+      }
+
+      function processDependencies(dir, packages, dependencies) {
+          if(fs.existsSync(dir)) {
+              var files = fs.readdirSync(dir);
+
+              files.forEach(function(entry) {
+                  var filePath = path.join(dir, entry);
+                  var stats = fs.statSync(filePath);
+
+                  if(stats.isDirectory()) {
+                      if(entry.substr(0, 1) == "@") {
+                          // When we encounter a namespace folder, augment all packages belonging to the scope
+                          var pkgFiles = fs.readdirSync(filePath);
+
+                          pkgFiles.forEach(function(entry) {
+                              if(stats.isDirectory()) {
+                                  var pkgFilePath = path.join(filePath, entry);
+                                  augmentPackageJSON(pkgFilePath, packages, dependencies);
+                              }
+                          });
+                      } else {
+                          augmentPackageJSON(filePath, packages, dependencies);
+                      }
+                  }
+              });
+          }
+      }
+
+      processDependencies("node_modules", lockObj.packages, lockObj.dependencies);
+
+      fs.writeFileSync("package-lock.json", JSON.stringify(lockObj, null, 2));
+    '';
+  };
+
+  # Script that links bins defined in package.json to the node_modules bin directory
+  # NPM does not do this for top-level packages itself anymore as of v7
+  linkBinsScript = writeTextFile {
+    name = "linkbins.js";
+    text = ''
+      var fs = require('fs');
+      var path = require('path');
+
+      var packageObj = JSON.parse(fs.readFileSync("package.json"));
+
+      var nodeModules = Array(packageObj.name.split("/").length).fill("..").join(path.sep);
+
+      if(packageObj.bin !== undefined) {
+          fs.mkdirSync(path.join(nodeModules, ".bin"))
+
+          if(typeof packageObj.bin == "object") {
+              Object.keys(packageObj.bin).forEach(function(exe) {
+                  if(fs.existsSync(packageObj.bin[exe])) {
+                      console.log("linking bin '" + exe + "'");
+                      fs.symlinkSync(
+                          path.join("..", packageObj.name, packageObj.bin[exe]),
+                          path.join(nodeModules, ".bin", exe)
+                      );
+                  }
+                  else {
+                      console.log("skipping non-existent bin '" + exe + "'");
+                  }
+              })
+          }
+          else {
+              if(fs.existsSync(packageObj.bin)) {
+                  console.log("linking bin '" + packageObj.bin + "'");
+                  fs.symlinkSync(
+                      path.join("..", packageObj.name, packageObj.bin),
+                      path.join(nodeModules, ".bin", packageObj.name.split("/").pop())
+                  );
+              }
+              else {
+                  console.log("skipping non-existent bin '" + packageObj.bin + "'");
+              }
+          }
+      }
+      else if(packageObj.directories !== undefined && packageObj.directories.bin !== undefined) {
+          fs.mkdirSync(path.join(nodeModules, ".bin"))
+
+          fs.readdirSync(packageObj.directories.bin).forEach(function(exe) {
+              if(fs.existsSync(path.join(packageObj.directories.bin, exe))) {
+                  console.log("linking bin '" + exe + "'");
+                  fs.symlinkSync(
+                      path.join("..", packageObj.name, packageObj.directories.bin, exe),
+                      path.join(nodeModules, ".bin", exe)
+                  );
+              }
+              else {
+                  console.log("skipping non-existent bin '" + exe + "'");
+              }
+          })
+      }
+    '';
+  };
+
+  prepareAndInvokeNPM = {packageName, bypassCache, reconstructLock, npmFlags, production}:
+    let
+      forceOfflineFlag = if bypassCache then "--offline" else "--registry http://www.example.com";
+    in
+    ''
+        # Pinpoint the versions of all dependencies to the ones that are actually being used
+        echo "pinpointing versions of dependencies..."
+        source $pinpointDependenciesScriptPath
+
+        # Patch the shebangs of the bundled modules to prevent them from
+        # calling executables outside the Nix store as much as possible
+        patchShebangs .
+
+        # Deploy the Node.js package by running npm install. Since the
+        # dependencies have been provided already by ourselves, it should not
+        # attempt to install them again, which is good, because we want to make
+        # it Nix's responsibility. If it needs to install any dependencies
+        # anyway (e.g. because the dependency parameters are
+        # incomplete/incorrect), it fails.
+        #
+        # The other responsibilities of NPM are kept -- version checks, build
+        # steps, postprocessing etc.
+
+        export HOME=$TMPDIR
+        cd "${packageName}"
+        runHook preRebuild
+
+        ${lib.optionalString bypassCache ''
+          ${lib.optionalString reconstructLock ''
+            if [ -f package-lock.json ]
+            then
+                echo "WARNING: Reconstruct lock option enabled, but a lock file already exists!"
+                echo "This will most likely result in version mismatches! We will remove the lock file and regenerate it!"
+                rm package-lock.json
+            else
+                echo "No package-lock.json file found, reconstructing..."
+            fi
+
+            node ${reconstructPackageLock}
+          ''}
+
+          node ${addIntegrityFieldsScript}
+        ''}
+
+        npm ${forceOfflineFlag} --nodedir=${nodeSources} ${npmFlags} ${lib.optionalString production "--production"} rebuild
+
+        runHook postRebuild
+
+        if [ "''${dontNpmInstall-}" != "1" ]
+        then
+            # NPM tries to download packages even when they already exist if npm-shrinkwrap is used.
+            rm -f npm-shrinkwrap.json
+
+            npm ${forceOfflineFlag} --nodedir=${nodeSources} --no-bin-links --ignore-scripts ${npmFlags} ${lib.optionalString production "--production"} install
+        fi
+
+        # Link executables defined in package.json
+        node ${linkBinsScript}
+    '';
+
+  # Builds and composes an NPM package including all its dependencies
+  buildNodePackage =
+    { name
+    , packageName
+    , version ? null
+    , dependencies ? []
+    , buildInputs ? []
+    , production ? true
+    , npmFlags ? ""
+    , dontNpmInstall ? false
+    , bypassCache ? false
+    , reconstructLock ? false
+    , preRebuild ? ""
+    , dontStrip ? true
+    , unpackPhase ? "true"
+    , buildPhase ? "true"
+    , meta ? {}
+    , ... }@args:
+
+    let
+      extraArgs = removeAttrs args [ "name" "dependencies" "buildInputs" "dontStrip" "dontNpmInstall" "preRebuild" "unpackPhase" "buildPhase" "meta" ];
+    in
+    stdenv.mkDerivation ({
+      name = "${name}${if version == null then "" else "-${version}"}";
+      buildInputs = [ tarWrapper python nodejs ]
+        ++ lib.optional (stdenv.isLinux) utillinux
+        ++ lib.optional (stdenv.isDarwin) libtool
+        ++ buildInputs;
+
+      inherit nodejs;
+
+      inherit dontStrip; # Stripping may fail a build for some package deployments
+      inherit dontNpmInstall preRebuild unpackPhase buildPhase;
+
+      compositionScript = composePackage args;
+      pinpointDependenciesScript = pinpointDependenciesOfPackage args;
+
+      passAsFile = [ "compositionScript" "pinpointDependenciesScript" ];
+
+      installPhase = ''
+        source ${installPackage}
+
+        # Create and enter a root node_modules/ folder
+        mkdir -p $out/lib/node_modules
+        cd $out/lib/node_modules
+
+        # Compose the package and all its dependencies
+        source $compositionScriptPath
+
+        ${prepareAndInvokeNPM { inherit packageName bypassCache reconstructLock npmFlags production; }}
+
+        # Create symlink to the deployed executable folder, if applicable
+        if [ -d "$out/lib/node_modules/.bin" ]
+        then
+            ln -s $out/lib/node_modules/.bin $out/bin
+
+            # Fixup all executables
+            ls $out/bin/* | while read i
+            do
+                file="$(readlink -f "$i")"
+                chmod u+rwx "$file"
+                if isScript "$file"
+                then
+                    sed -i 's/\r$//' "$file"  # convert crlf to lf
+                fi
+            done
+        fi
+
+        # Create symlinks to the deployed manual page folders, if applicable
+        if [ -d "$out/lib/node_modules/${packageName}/man" ]
+        then
+            mkdir -p $out/share
+            for dir in "$out/lib/node_modules/${packageName}/man/"*
+            do
+                mkdir -p $out/share/man/$(basename "$dir")
+                for page in "$dir"/*
+                do
+                    ln -s $page $out/share/man/$(basename "$dir")
+                done
+            done
+        fi
+
+        # Run post install hook, if provided
+        runHook postInstall
+      '';
+
+      meta = {
+        # default to Node.js' platforms
+        platforms = nodejs.meta.platforms;
+      } // meta;
+    } // extraArgs);
+
+  # Builds a node environment (a node_modules folder and a set of binaries)
+  buildNodeDependencies =
+    { name
+    , packageName
+    , version ? null
+    , src
+    , dependencies ? []
+    , buildInputs ? []
+    , production ? true
+    , npmFlags ? ""
+    , dontNpmInstall ? false
+    , bypassCache ? false
+    , reconstructLock ? false
+    , dontStrip ? true
+    , unpackPhase ? "true"
+    , buildPhase ? "true"
+    , ... }@args:
+
+    let
+      extraArgs = removeAttrs args [ "name" "dependencies" "buildInputs" ];
+    in
+      stdenv.mkDerivation ({
+        name = "node-dependencies-${name}${if version == null then "" else "-${version}"}";
+
+        buildInputs = [ tarWrapper python nodejs ]
+          ++ lib.optional (stdenv.isLinux) utillinux
+          ++ lib.optional (stdenv.isDarwin) libtool
+          ++ buildInputs;
+
+        inherit dontStrip; # Stripping may fail a build for some package deployments
+        inherit dontNpmInstall unpackPhase buildPhase;
+
+        includeScript = includeDependencies { inherit dependencies; };
+        pinpointDependenciesScript = pinpointDependenciesOfPackage args;
+
+        passAsFile = [ "includeScript" "pinpointDependenciesScript" ];
+
+        installPhase = ''
+          source ${installPackage}
+
+          mkdir -p $out/${packageName}
+          cd $out/${packageName}
+
+          source $includeScriptPath
+
+          # Create fake package.json to make the npm commands work properly
+          cp ${src}/package.json .
+          chmod 644 package.json
+          ${lib.optionalString bypassCache ''
+            if [ -f ${src}/package-lock.json ]
+            then
+                cp ${src}/package-lock.json .
+                chmod 644 package-lock.json
+            fi
+          ''}
+
+          # Go to the parent folder to make sure that all packages are pinpointed
+          cd ..
+          ${lib.optionalString (builtins.substring 0 1 packageName == "@") "cd .."}
+
+          ${prepareAndInvokeNPM { inherit packageName bypassCache reconstructLock npmFlags production; }}
+
+          # Expose the executables that were installed
+          cd ..
+          ${lib.optionalString (builtins.substring 0 1 packageName == "@") "cd .."}
+
+          mv ${packageName} lib
+          ln -s $out/lib/node_modules/.bin $out/bin
+        '';
+      } // extraArgs);
+
+  # Builds a development shell
+  buildNodeShell =
+    { name
+    , packageName
+    , version ? null
+    , src
+    , dependencies ? []
+    , buildInputs ? []
+    , production ? true
+    , npmFlags ? ""
+    , dontNpmInstall ? false
+    , bypassCache ? false
+    , reconstructLock ? false
+    , dontStrip ? true
+    , unpackPhase ? "true"
+    , buildPhase ? "true"
+    , ... }@args:
+
+    let
+      nodeDependencies = buildNodeDependencies args;
+      extraArgs = removeAttrs args [ "name" "dependencies" "buildInputs" "dontStrip" "dontNpmInstall" "unpackPhase" "buildPhase" ];
+    in
+    stdenv.mkDerivation ({
+      name = "node-shell-${name}${if version == null then "" else "-${version}"}";
+
+      buildInputs = [ python nodejs ] ++ lib.optional (stdenv.isLinux) utillinux ++ buildInputs;
+      buildCommand = ''
+        mkdir -p $out/bin
+        cat > $out/bin/shell <<EOF
+        #! ${stdenv.shell} -e
+        $shellHook
+        exec ${stdenv.shell}
+        EOF
+        chmod +x $out/bin/shell
+      '';
+
+      # Provide the dependencies in a development shell through the NODE_PATH environment variable
+      inherit nodeDependencies;
+      shellHook = lib.optionalString (dependencies != []) ''
+        export NODE_PATH=${nodeDependencies}/lib/node_modules
+        export PATH="${nodeDependencies}/bin:$PATH"
+      '';
+    } // extraArgs);
+in
+{
+  buildNodeSourceDist = lib.makeOverridable buildNodeSourceDist;
+  buildNodePackage = lib.makeOverridable buildNodePackage;
+  buildNodeDependencies = lib.makeOverridable buildNodeDependencies;
+  buildNodeShell = lib.makeOverridable buildNodeShell;
+}

pkgs/by-name/be/betanin/package.nix

@@ -0,0 +1,71 @@
+{ lib
+, callPackage
+, fetchFromGitHub
+, python3
+, beets
+}:
+
+let
+  py = python3.pkgs;
+
+  version = "0.4.0.ffe45c02";
+
+  src = fetchFromGitHub {
+    owner = "xeals";
+    repo = "betanin";
+    rev = "ffe45c028037fc1659f62a9cdc9e1413dc2f358d";
+    hash = "sha256-5d8Y7PDlhkdVRVX+KvpiQ2WYNRELwc+ya5s4Qi+YQpI=";
+  };
+
+  client = callPackage ./client {
+    inherit src version;
+  };
+in
+py.buildPythonApplication {
+  pname = "betanin";
+  inherit version src;
+
+  clientDistDir = "${client}/lib/node_modules/betanin/dist/";
+
+  doCheck = false;
+
+  patches = [ ./paths.patch ];
+  postPatch = ''
+    export libPrefix="${python3.libPrefix}"
+    substituteAllInPlace betanin/paths.py
+  '';
+
+  propagatedBuildInputs =
+    (builtins.attrValues {
+      inherit (py)
+        apprise
+        alembic
+        click
+        flask
+        flask-cors
+        flask-jwt-extended
+        flask_migrate
+        flask-restx
+        flask-socketio
+        flask-sqlalchemy
+        gevent
+        pyxdg
+        loguru
+        ptyprocess
+        python-engineio
+        python-socketio
+        sqlalchemy
+        sqlalchemy-utils
+        toml;
+    }) ++ [
+      beets
+    ];
+
+  meta = {
+    homepage = "https://github.com/sentriz/betanin";
+    description = "beets based mitm of your torrent client and music player";
+    license = lib.licenses.gpl3Only;
+    maintainers = [ ];
+    platforms = python3.meta.platforms;
+  };
+}

pkgs/by-name/be/betanin/paths.patch

@@ -0,0 +1,24 @@
+--- a/betanin/paths.py
++++ b/betanin/paths.py
+@@ -19,11 +19,3 @@
+ BEETS_DIR = xdg.BaseDirectory.save_config_path("beets")
+-CLIENT_DIST_DIR = _first_existing(
+-    os.path.join(os.getcwd(), "betanin_client", "dist"),
+-    os.path.join(site.getusersitepackages(), "betanin_client", "dist"),
+-    os.path.join(site.getsitepackages()[0], "betanin_client", "dist"),
+-)
+-MIGRATIONS_DIR = _first_existing(
+-    os.path.join(os.getcwd(), "betanin_migrations"),
+-    os.path.join(site.getusersitepackages(), "betanin_migrations"),
+-    os.path.join(site.getsitepackages()[0], "betanin_migrations"),
+-)
++CLIENT_DIST_DIR = "@clientDistDir@"
++MIGRATIONS_DIR = "@out@/lib/@libPrefix@/site-packages/betanin_migrations"
+@@ -38,6 +38,2 @@
+ CONFIG_PATH = os.path.join(CONFIG_DIR, "config.toml")
+-VERSION_PATH = _first_existing(
+-    os.path.join(os.getcwd(), "betanin/version.txt"),
+-    os.path.join(site.getusersitepackages(), "betanin", "version.txt"),
+-    os.path.join(site.getsitepackages()[0], "betanin", "version.txt"),
+-)
++VERSION_PATH = "@out@/lib/@libPrefix@/site-packages/betanin/version.txt"