mp3fs: fix interoperation with samba

Ship and apply patch manually because building mp3fs from git is hell.

Also change meta.homepage to the one mentioned in the README.

pkgs/tools/filesystems/mp3fs/default.nix

@@ -9,6 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "14ngiqg24p3a0s6hp33zjl4i46d8qn4v9id36psycq3n3csmwyx4";
   };
 
+  patches = [ ./fix-statfs-operation.patch ];
+
   buildInputs = [ flac fuse lame libid3tag pkgconfig ];
 
   enableParallelBuilding = true;
@@ -22,7 +24,7 @@ stdenv.mkDerivation rec {
       which only understands the MP3 format, or transcode files through
       simple drag-and-drop in a file browser.
     '';
-    homepage = http://khenriks.github.com/mp3fs/;
+    homepage = http://khenriks.github.io/mp3fs/;
     license = with licenses; gpl3Plus;
     platforms = with platforms; linux;
     maintainers = with maintainers; [ nckx ];

pkgs/tools/filesystems/mp3fs/fix-statfs-operation.patch

@@ -0,0 +1,39 @@
+From fea072084ff9d7c4d2c688059a2462bb0e59a2ec Mon Sep 17 00:00:00 2001
+From: K Henriksson <kthenriksson@gmail.com>
+Date: Wed, 27 Aug 2014 21:55:18 -0700
+Subject: [PATCH] Fix statfs operation
+
+The statfs implementation does not properly translate names back to the
+original, since the major encoding rewrite. This corrects that, and
+should fix issue #27.
+---
+ src/fuseops.c | 15 +++++++++++++--
+ 1 file changed, 13 insertions(+), 2 deletions(-)
+
+diff --git a/src/fuseops.c b/src/fuseops.c
+index e7b4e7e..c333cbd 100644
+--- a/src/fuseops.c
++++ b/src/fuseops.c
+@@ -337,9 +337,20 @@ static int mp3fs_statfs(const char *path, struct statvfs *stbuf) {
+     if (!origpath) {
+         goto translate_fail;
+     }
+-    
++
++    /* pass-through for regular files */
++    if (statvfs(origpath, stbuf) == 0) {
++        goto passthrough;
++    } else {
++        /* Not really an error. */
++        errno = 0;
++    }
++
++    find_original(origpath);
++
+     statvfs(origpath, stbuf);
+-    
++
++passthrough:
+     free(origpath);
+ translate_fail:
+     return -errno;