rsync/rrsync: less code duplication

- refactor the common parts all into the base.nix
- add myself as maintainer

pkgs/applications/networking/sync/rsync/default.nix

@@ -5,17 +5,15 @@
 
 assert enableACLs -> acl != null;
 
+let
+  base = import ./base.nix { inherit stdenv fetchurl; };
+in
 stdenv.mkDerivation rec {
-  name = "rsync-${version}";
-  version = "3.1.2";
+  name = "rsync-${base.version}";
 
-  mainSrc = import ./src.nix { inherit fetchurl version; };
+  mainSrc = base.src;
 
-  patchesSrc = fetchurl {
-    # signed with key 0048 C8B0 26D4 C96F 0E58  9C2F 6C85 9FB1 4B96 A8C5
-    url = "mirror://samba/rsync/rsync-patches-${version}.tar.gz";
-    sha256 = "09i3dcl37p22dp75vlnsvx7bm05ggafnrf1zwhf2kbij4ngvxvpd";
-  };
+  patchesSrc = base.patches;
 
   srcs = [mainSrc] ++ stdenv.lib.optional enableCopyDevicesPatch patchesSrc;
   patches = stdenv.lib.optional enableCopyDevicesPatch "./patches/copy-devices.diff";
@@ -25,11 +23,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = "--with-nobody-group=nogroup";
 
-  meta = with stdenv.lib; {
-    homepage = http://rsync.samba.org/;
+  meta = base.meta // {
     description = "A fast incremental file transfer utility";
-    license = licenses.gpl3Plus;
-    platforms = platforms.unix;
-    maintainers = with maintainers; [ simons ehmry ];
   };
 }