Create a desktop entry and some mimetype associations for xdg-open in

ubuntu-core. That way interacting with web, email and documentations 
urls in a snap should do the right thing.

debian/changelog

@@ -3,6 +3,9 @@ livecd-rootfs (2.425) UNRELEASED; urgency=medium
   * live-build/ubuntu-core/hooks/400-create-apt-get-warning.binary,
     500-create-xdg-wrapper.binary, 700-classic-dir.binary:
     - Correct some syntax errors in the ubuntu-core snap hooks.
+    - Create a desktop entry and some mimetype associations for xdg-open in
+      ubuntu-core. That way interacting with web, email and documentations 
+      urls in a snap should do the right thing.
 
  -- Sebastien Bacher <seb128@ubuntu.com>  Wed, 17 Aug 2016 12:08:42 +0200
 

live-build/ubuntu-core/hooks/500-create-xdg-wrapper.binary

@@ -13,3 +13,28 @@ dbus-send --print-reply --session --dest=com.canonical.SafeLauncher / com.canoni
 EOF
 chmod 755 $PREFIX/usr/local/bin/xdg-open
 
+# corresponding .desktop entry, needed for mimetype registration
+mkdir -p $PREFIX/usr/local/share/applications
+cat >$PREFIX/usr/local/share/applications/xdg-open.desktop <<EOF
+[Desktop Entry]
+Version=1.0
+Name=Url Handler Script
+Exec=/usr/local/bin/xdg-open %u
+MimeType=x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/mailto;x-scheme-handler/help;
+Type=Application
+EOF
+
+# define xdg-open as the default handler for common types
+cat >$PREFIX/usr/local/share/applications/mimeapps.list <<EOF
+[Added Associations]
+x-scheme-handler/http=xdg-open.desktop
+x-scheme-handler/https=xdg-open.desktop
+x-scheme-handler/mailto=xdg-open.desktop
+x-scheme-handler/help=xdg-open.desktop
+
+[Default Applications]
+x-scheme-handler/http=xdg-open.desktop
+x-scheme-handler/https=xdg-open.desktop
+x-scheme-handler/mailto=xdg-open.desktop
+x-scheme-handler/help=xdg-open.desktop
+EOF