Package up dependencies with composer2nix

I had to patch composer2nix with:

require_once(dirname(__FILE__)./../../../../vendor/autoload.php);

default.nix

@@ -68,22 +68,5 @@ EOF
     fi
   '';
 
-  ofborg.php = pkgs.runCommand
-    "ofborg"
-    {
-      src = builtins.filterSource
-        (path: type: !(
-             (type == "symlink" && baseNameOf path == "result")
-          || (type == "directory" && baseNameOf path == ".git")
-        ))
-        ./php;
-    }
-    ''
-      cp -r $src ./ofborg
-      chmod -R u+w ./ofborg
-      cd ofborg
-      ls -la
-      cd ..
-      mv ofborg $out
-    '';
+  ofborg.php = import ./php { inherit pkgs; };
 }

php/composer-env.nix

@@ -0,0 +1,270 @@
+# This file originates from composer2nix
+
+{ stdenv, writeTextFile, fetchurl, php, unzip }:
+
+let
+  composer = stdenv.mkDerivation {
+    name = "composer-1.6.5";
+    src = fetchurl {
+      url = https://github.com/composer/composer/releases/download/1.6.5/composer.phar;
+      sha256 = "07xkpg9y1dd4s33y3cbf7r5fphpgc39mpm066a8m9y4ffsf539f0";
+    };
+    buildInputs = [ php ];
+
+    # We must wrap the composer.phar because of the impure shebang.
+    # We cannot use patchShebangs because the executable verifies its own integrity and will detect that somebody has tampered with it.
+
+    buildCommand = ''
+      # Copy phar file
+      mkdir -p $out/share/php
+      cp $src $out/share/php/composer.phar
+      chmod 755 $out/share/php/composer.phar
+
+      # Create wrapper executable
+      mkdir -p $out/bin
+      cat > $out/bin/composer <<EOF
+      #! ${stdenv.shell} -e
+      exec ${php}/bin/php $out/share/php/composer.phar "\$@"
+      EOF
+      chmod +x $out/bin/composer
+    '';
+    meta = {
+      description = "Dependency Manager for PHP";
+      #license = stdenv.licenses.mit;
+      maintainers = [ stdenv.lib.maintainers.sander ];
+      platforms = stdenv.lib.platforms.unix;
+    };
+  };
+
+  buildZipPackage = { name, src }:
+    stdenv.mkDerivation {
+      inherit name src;
+      buildInputs = [ unzip ];
+      buildCommand = ''
+        unzip $src
+        baseDir=$(find . -type d -mindepth 1 -maxdepth 1)
+        cd $baseDir
+        mkdir -p $out
+        mv * $out
+      '';
+    };
+
+  buildPackage =
+    { name
+    , src
+    , packages ? {}
+    , devPackages ? {}
+    , buildInputs ? []
+    , symlinkDependencies ? false
+    , executable ? false
+    , removeComposerArtifacts ? false
+    , postInstall ? ""
+    , noDev ? false
+    , unpackPhase ? "true"
+    , buildPhase ? "true"
+    , ...}@args:
+
+    let
+      reconstructInstalled = writeTextFile {
+        name = "reconstructinstalled.php";
+        executable = true;
+        text = ''
+          #! ${php}/bin/php
+          <?php
+          if(file_exists($argv[1]))
+          {
+              $composerLockStr = file_get_contents($argv[1]);
+
+              if($composerLockStr === false)
+              {
+                  fwrite(STDERR, "Cannot open composer.lock contents\n");
+                  exit(1);
+              }
+              else
+              {
+                  $config = json_decode($composerLockStr, true);
+
+                  if(array_key_exists("packages", $config))
+                      $allPackages = $config["packages"];
+                  else
+                      $allPackages = array();
+
+                  ${stdenv.lib.optionalString (!noDev) ''
+                    if(array_key_exists("packages-dev", $config))
+                        $allPackages = array_merge($allPackages, $config["packages-dev"]);
+                  ''}
+
+                  $packagesStr = json_encode($allPackages, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
+                  print($packagesStr);
+              }
+          }
+          else
+              print("[]");
+          ?>
+        '';
+      };
+
+      constructBin = writeTextFile {
+        name = "constructbin.php";
+        executable = true;
+        text = ''
+          #! ${php}/bin/php
+          <?php
+          $composerJSONStr = file_get_contents($argv[1]);
+
+          if($composerJSONStr === false)
+          {
+              fwrite(STDERR, "Cannot open composer.json contents\n");
+              exit(1);
+          }
+          else
+          {
+              $config = json_decode($composerJSONStr, true);
+
+              if(array_key_exists("bin-dir", $config))
+                  $binDir = $config["bin-dir"];
+              else
+                  $binDir = "bin";
+
+              if(array_key_exists("bin", $config))
+              {
+                  if(!file_exists("vendor/".$binDir))
+                      mkdir("vendor/".$binDir);
+
+                  foreach($config["bin"] as $bin)
+                      symlink("../../".$bin, "vendor/".$binDir."/".basename($bin));
+              }
+          }
+          ?>
+        '';
+      };
+
+      bundleDependencies = dependencies:
+        stdenv.lib.concatMapStrings (dependencyName:
+          let
+            dependency = dependencies.${dependencyName};
+          in
+          ''
+            ${if dependency.targetDir == "" then ''
+              vendorDir="$(dirname ${dependencyName})"
+              mkdir -p "$vendorDir"
+              ${if symlinkDependencies then
+                ''ln -s "${dependency.src}" "$vendorDir/$(basename "${dependencyName}")"''
+                else
+                ''cp -av "${dependency.src}" "$vendorDir/$(basename "${dependencyName}")"''
+              }
+            '' else ''
+              namespaceDir="${dependencyName}/$(dirname "${dependency.targetDir}")"
+              mkdir -p "$namespaceDir"
+              ${if symlinkDependencies then
+                ''ln -s "${dependency.src}" "$namespaceDir/$(basename "${dependency.targetDir}")"''
+              else
+                ''cp -av "${dependency.src}" "$namespaceDir/$(basename "${dependency.targetDir}")"''
+              }
+            ''}
+          '') (builtins.attrNames dependencies);
+
+      extraArgs = removeAttrs args [ "name" "packages" "devPackages" "buildInputs" ];
+    in
+    stdenv.mkDerivation ({
+      name = "composer-${name}";
+      buildInputs = [ php composer ] ++ buildInputs;
+
+      inherit unpackPhase buildPhase;
+
+      installPhase = ''
+        ${if executable then ''
+          mkdir -p $out/share/php
+          cp -av $src $out/share/php/$name
+          chmod -R u+w $out/share/php/$name
+          cd $out/share/php/$name
+        '' else ''
+          cp -av $src $out
+          chmod -R u+w $out
+          cd $out
+        ''}
+
+        # Remove unwanted files
+        rm -f *.nix
+
+        export HOME=$TMPDIR
+
+        # Remove the provided vendor folder if it exists
+        rm -Rf vendor
+
+        # If there is no composer.lock file, compose a dummy file.
+        # Otherwise, composer attempts to download the package.json file from
+        # the registry which we do not want.
+        if [ ! -f composer.lock ]
+        then
+            cat > composer.lock <<EOF
+        {
+            "packages": []
+        }
+        EOF
+        fi
+
+        # Reconstruct the installed.json file from the lock file
+        mkdir -p vendor/composer
+        ${reconstructInstalled} composer.lock > vendor/composer/installed.json
+
+        # Copy or symlink the provided dependencies
+        cd vendor
+        ${bundleDependencies packages}
+        ${stdenv.lib.optionalString (!noDev) (bundleDependencies devPackages)}
+        cd ..
+
+        # Reconstruct autoload scripts
+        # We use the optimize feature because Nix packages cannot change after they have been built
+        # Using the dynamic loader for a Nix package is useless since there is nothing to dynamically reload.
+        composer dump-autoload --optimize ${stdenv.lib.optionalString noDev "--no-dev"}
+
+        # Run the install step as a validation to confirm that everything works out as expected
+        composer install --optimize-autoloader ${stdenv.lib.optionalString noDev "--no-dev"}
+
+        ${stdenv.lib.optionalString executable ''
+          # Reconstruct the bin/ folder if we deploy an executable project
+          ${constructBin} composer.json
+          ln -s $(pwd)/vendor/bin $out/bin
+        ''}
+
+        ${stdenv.lib.optionalString (!symlinkDependencies) ''
+          # Patch the shebangs if possible
+          if [ -d $(pwd)/vendor/bin ]
+          then
+              # Look for all executables in bin/
+              for i in $(pwd)/vendor/bin/*
+              do
+                  # Look for their location
+                  realFile=$(readlink -f "$i")
+
+                  # Restore write permissions
+                  chmod u+wx "$(dirname "$realFile")"
+                  chmod u+w "$realFile"
+
+                  # Patch shebang
+                  sed -e "s|#!/usr/bin/php|#!${php}/bin/php|" \
+                      -e "s|#!/usr/bin/env php|#!${php}/bin/php|" \
+                      "$realFile" > tmp
+                  mv tmp "$realFile"
+                  chmod u+x "$realFile"
+              done
+          fi
+        ''}
+
+        if [ "$removeComposerArtifacts" = "1" ]
+        then
+            # Remove composer stuff
+            rm -f composer.json composer.lock
+        fi
+
+        # Execute post install hook
+        runHook postInstall
+    '';
+  } // extraArgs);
+in
+{
+  composer = stdenv.lib.makeOverridable composer;
+  buildZipPackage = stdenv.lib.makeOverridable buildZipPackage;
+  buildPackage = stdenv.lib.makeOverridable buildPackage;
+}

php/composer.json

@@ -1,5 +1,7 @@
 {
+    "name": "ofborg-webhook",
     "require": {
-        "php-amqplib/php-amqplib": ">=2.6.1"
+        "php-amqplib/php-amqplib": ">=2.6.1",
+        "svanderburg/composer2nix": ">=0.0.3"
     }
 }