puddletag: fix the due to sourceRoot changes

pkgs/applications/audio/puddletag/default.nix

@@ -1,20 +1,17 @@
 { stdenv, fetchFromGitHub, python2Packages, makeWrapper, chromaprint }:
 
-let
-  pname = "puddletag";
-
-in python2Packages.buildPythonApplication rec {
-  name = "${pname}-${version}";
+python2Packages.buildPythonApplication rec {
+  name = "puddletag-${version}";
   version = "1.2.0";
 
   src = fetchFromGitHub {
-    owner = "keithgg";
-    repo = pname;
-    rev = "v${version}";
+    owner  = "keithgg";
+    repo   = "puddletag";
+    rev    = "v${version}";
     sha256 = "1g6wa91awy17z5b704yi9kfynnvfm9lkrvpfvwccscr1h8s3qmiz";
   };
 
-  sourceRoot = "${pname}-v${version}-src/source";
+  sourceRoot = "source/source";
 
   disabled = python2Packages.isPy3k; # work to support python 3 has not begun
 
@@ -29,17 +26,21 @@ in python2Packages.buildPythonApplication rec {
   dontStrip = true;  # we are not generating any binaries
 
   installPhase = ''
+    runHook preInstall
+
     siteDir=$(toPythonPath $out)
     mkdir -p $siteDir
     PYTHONPATH=$PYTHONPATH:$siteDir
     ${python2Packages.python.interpreter} setup.py install --prefix $out
+
+    runHook postInstall
   '';
 
   meta = with stdenv.lib; {
-    homepage = https://puddletag.net;
+    homepage    = https://puddletag.net;
     description = "An audio tag editor similar to the Windows program, Mp3tag";
-    license = licenses.gpl3;
-    platforms = platforms.linux;
+    license     = licenses.gpl3;
     maintainers = with maintainers; [ peterhoeg ];
+    platforms   = platforms.linux;
   };
 }