Linux: update xdg-utils to the latest git version and include a one-line fix in xdg-mime.

scripts/xdg-mime

 #!/bin/sh
 #---------------------------------------------
 #   xdg-mime
 #
 #   Utility script to manipulate MIME related information
 #   on XDG compliant systems.
 #
 #   Refer to the usage() function below for usage.
 #
 #   Copyright 2009-2010, Fathi Boudra <fabo@freedesktop.org>
@@ skipping 226 matching lines @@
 #----------------------------------------------------------------------------
 
 DEBUG()
 {
   [ -z "${XDG_UTILS_DEBUG_LEVEL}" ] && return 0;
   [ ${XDG_UTILS_DEBUG_LEVEL} -lt $1 ] && return 0;
   shift
   echo "$@" >&2
 }
 
+# This handles backslashes but not quote marks.
+first_word()
+{
+    read first rest
+    echo "$first"
+}
+
+#-------------------------------------------------------------
+# map a binary to a .desktop file
+binary_to_desktop_file()
+{
+    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
+    binary="`which "$1"`"
+    binary="`readlink -f "$binary"`"
+    base="`basename "$binary"`"
+    IFS=:
+    for dir in $search; do
+        unset IFS
+        [ "$dir" ] || continue
+        [ -d "$dir/applications" -o -d "$dir/applnk" ] || continue
+        for file in "$dir"/applications/*.desktop "$dir"/applications/*/*.desktop "$dir"/applnk/*.desktop "$dir"/applnk/*/*.desktop; do
+            [ -r "$file" ] || continue
+            # Check to make sure it's worth the processing.
+            grep -q "^Exec.*$base" "$file" || continue
+            # Make sure it's a visible desktop file (e.g. not "preferred-web-browser.desktop").
+            grep -Eq "^(NoDisplay|Hidden)=true" "$file" && continue
+            command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
+            command="`which "$command"`"
+            if [ x"`readlink -f "$command"`" = x"$binary" ]; then
+                # Fix any double slashes that got added path composition
+                echo "$file" | sed -e 's,//*,/,g'
+                return
+            fi
+        done
+    done
+}
+
+#-------------------------------------------------------------
+# map a .desktop file to a binary
+## FIXME: handle vendor dir case
+desktop_file_to_binary()
+{
+    search="${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
+    desktop="`basename "$1"`"
+    IFS=:
+    for dir in $search; do
+        unset IFS
+        [ "$dir" -a -d "$dir/applications" ] || continue
+        file="$dir/applications/$desktop"
+        [ -r "$file" ] || continue
+        # Remove any arguments (%F, %f, %U, %u, etc.).
+        command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
+        command="`which "$command"`"
+        readlink -f "$command"
+        return
+    done
+}
+
 #-------------------------------------------------------------
 # Exit script on successfully completing the desired operation
 
 exit_success()
 {
     if [ $# -gt 0 ]; then
         echo "$@"
         echo
     fi
 
@@ skipping 335 matching lines @@
         default_dir=`kde-config --path config 2> /dev/null | cut -d ':' -f 1`
         default_file="$default_dir/profilerc"
     fi
     if [ -z "$default_dir" ]; then
         DEBUG 2 "make_default_kde: No kde runtime detected"
         return
     fi
     DEBUG 2 "make_default_kde $vendor $mimetype"
     DEBUG 1 "Updating $default_file"
     mkdir -p "$default_dir"
-    [ -f $default_file ] || touch $default_file
+    [ -f "$default_file" ] || touch "$default_file"
     if [ x"$KDE_SESSION_VERSION" = x"4" ]; then
-        [ -f $default_file ] || touch $default_file
+        [ -f "$default_file" ] || touch "$default_file"
         awk -v application="$vendor" -v mimetype="$mimetype" '
     BEGIN {
         prefix=mimetype "="
         associations=0
         found=0
         blanks=0
     }
     {
         suppress=0
         if (index($0, "[Added Associations]") == 1) {
@@ skipping 36 matching lines @@
             if (!associations) {
                 print "[Added Associations]"
             }
             print prefix application
         }
         while (blanks > 0) {
             print ""
             blanks--
         }
     }
-' $default_file > ${default_file}.new && mv ${default_file}.new $default_file
+' "$default_file" > "${default_file}.new" && mv "${default_file}.new" "$default_file"
         eval 'kbuildsycoca4'$xdg_redirect_output
     else
         awk -v application="$vendor" -v mimetype="$mimetype" '
     BEGIN {
         header_start="[" mimetype " - "
         suppress=0
     }
     {
         if (index($0, header_start) == 1 )
             suppress=1
         else
             if (/^\[/) { suppress=0 }
 
         if (!suppress) {
             print $0
         }
     }
     END {
         print ""
         print "[" mimetype " - 1]"
         print "Application=" application
         print "AllowAsDefault=true"
         print "GenericServiceType=Application"
         print "Preference=1"
         print "ServiceType=" mimetype
     }
-' $default_file > ${default_file}.new && mv ${default_file}.new $default_file
+' "$default_file" > "${default_file}.new" && mv "${default_file}.new" "$default_file"
     fi
 }
 
 make_default_generic()
 {
     # $1 is vendor-name.desktop
     # $2 is mime/type
     # Add $2=$1 to XDG_DATA_HOME/applications/mimeapps.list
     xdg_user_dir="$XDG_DATA_HOME"
     [ -n "$xdg_user_dir" ] || xdg_user_dir="$HOME/.local/share"
     default_file="$xdg_user_dir/applications/mimeapps.list"
     DEBUG 2 "make_default_generic $1 $2"
     DEBUG 1 "Updating $default_file"
+    [ -f "$default_file" ] || touch "$default_file"
     awk -v mimetype="$2" -v application="$1" '
     BEGIN {
         prefix=mimetype "="
         indefault=0
         added=0
         blanks=0
         found=0
     }
     {
         suppress=0
@@ skipping 27 matching lines @@
                 print ""
                 print "[Default Applications]"
             }
             print prefix application
         }
         while (blanks > 0) {
             print ""
             blanks--
         }
     }
-' $default_file > ${default_file}.new && mv ${default_file}.new $default_file
+' "$default_file" > "${default_file}.new" && mv "${default_file}.new" "$default_file"
 }
 
 defapp_generic()
 {
     MIME="$1"
     xdg_user_dir="$XDG_DATA_HOME"
     [ -n "$xdg_user_dir" ] || xdg_user_dir="$HOME/.local/share"
     xdg_user_dir="$xdg_user_dir/$xdg_dir_name"
     xdg_system_dirs="$XDG_DATA_DIRS"
     [ -n "$xdg_system_dirs" ] || xdg_system_dirs=/usr/local/share/:/usr/share/
@@ skipping 555 matching lines @@
                 rm -f $kde_dir/$x.desktop
             fi
         done
         ;;
 esac
 
 update_mime_database $xdg_base_dir
 
 exit_success