adminer: Clean up

- Drop unused arguments.
- Do not use both php and phpPackages since those can have different PHP versions.
- Do not use with statement just for a single composer package.
- Add phase hooks so that one can easily customize the derivation.
- Clarify license to gpl-2.0-only.
- Add jtojnar to maintainers.

pkgs/servers/adminer/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, libbsd, fetchurl, phpPackages, php }:
+{ stdenv, fetchurl, php }:
 
 stdenv.mkDerivation rec {
   version = "4.7.8";
@@ -10,22 +10,36 @@ stdenv.mkDerivation rec {
     sha256 = "0k794agvd8pa3mwl0076i7753fzxd41lhr23aih4l2lbdgnzi68z";
   };
 
-  nativeBuildInputs = with phpPackages; [ php composer ];
+  nativeBuildInputs = [
+    php
+    php.packages.composer
+  ];
 
   buildPhase = ''
+    runHook preBuild
+
     composer --no-cache run compile
+
+    runHook postBuild
   '';
 
   installPhase = ''
+    runHook preInstall
+
     mkdir $out
     cp adminer-${version}.php $out/adminer.php
+
+    runHook postInstall
   '';
 
   meta = with stdenv.lib; {
     description = "Database management in a single PHP file";
     homepage = "https://www.adminer.org";
-    license = with licenses; [ asl20 gpl2 ];
-    maintainers = with maintainers; [ sstef ];
+    license = with licenses; [ asl20 gpl2Only ];
+    maintainers = with maintainers; [
+      jtojnar
+      sstef
+    ];
     platforms = platforms.all;
   };
 }