Patch from mdm@google.com...

third_party/xdg-utils/scripts/xdg-su

+#!/bin/sh
+#---------------------------------------------
+#   xdg-su
+#
+#   Utility script to run a command as an alternate user, generally
+#       the root user, with a graphical prompt for the root
+#       password if needed
+#
+#   Refer to the usage() function below for usage.
+#
+#   Copyright 2006, Jeremy White <jwhite@codeweavers.com>
+#   Copyright 2006, Kevin Krammer <kevin.krammer@gmx.at>
+#
+#   LICENSE:
+#
+#   Permission is hereby granted, free of charge, to any person obtaining a
+#   copy of this software and associated documentation files (the "Software"),
+#   to deal in the Software without restriction, including without limitation
+#   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+#   and/or sell copies of the Software, and to permit persons to whom the
+#   Software is furnished to do so, subject to the following conditions:
+#
+#   The above copyright notice and this permission notice shall be included
+#   in all copies or substantial portions of the Software.
+#
+#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+#   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+#   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+#   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+#   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+#   OTHER DEALINGS IN THE SOFTWARE.
+#
+#---------------------------------------------
+
+manualpage()
+{
+cat << _MANUALPAGE
+Name
+
+xdg-su - run a GUI program as root after prompting for the root password
+
+Synopsis
+
+xdg-su [-u user] -c command
+
+xdg-su { --help | --manual | --version }
+
+Description
+
+xdg-su provides a graphical dialog that prompts the user for a password to run
+command as user or as root if no user was specified.
+
+xdg-su is for use inside a desktop session only.
+
+xdg-su discards any stdout and stderr output from command.
+
+Options
+
+-u user
+    run command as user. The default is to run as root.
+--help
+    Show command synopsis.
+--manual
+    Show this manualpage.
+--version
+    Show the xdg-utils version information.
+
+Exit Codes
+
+An exit code of 0 indicates success while a non-zero exit code indicates
+failure. The following failure codes can be returned:
+
+1
+    Error in command line syntax.
+2
+    One of the files passed on the command line did not exist.
+3
+    A required tool could not be found.
+4
+    The action failed.
+
+See Also
+
+su(1)
+
+Examples
+
+xdg-su -u root -c "/opt/shinythings/bin/install-GUI --install fast"
+
+Runs the /opt/shinythings/bin/install-GUI command with root permissions.
+
+_MANUALPAGE
+}
+
+usage()
+{
+cat << _USAGE
+xdg-su - run a GUI program as root after prompting for the root password
+
+Synopsis
+
+xdg-su [-u user] -c command
+
+xdg-su { --help | --manual | --version }
+
+_USAGE
+}
+
+#@xdg-utils-common@
+
+#----------------------------------------------------------------------------
+#   Common utility functions included in all XDG wrapper scripts
+#----------------------------------------------------------------------------
+
+DEBUG()
+{
+  [ ${XDG_UTILS_DEBUG_LEVEL-0} -lt $1 ] && return 0;
+  shift
+  echo "$@" >&2
+}
+
+#-------------------------------------------------------------
+# Exit script on successfully completing the desired operation
+
+exit_success()
+{
+    if [ $# -gt 0 ]; then
+        echo "$@"
+        echo
+    fi
+
+    exit 0
+}
+
+
+#-----------------------------------------
+# Exit script on malformed arguments, not enough arguments
+# or missing required option.
+# prints usage information
+
+exit_failure_syntax()
+{
+    if [ $# -gt 0 ]; then
+        echo "xdg-su: $@" >&2
+        echo "Try 'xdg-su --help' for more information." >&2
+    else
+        usage
+        echo "Use 'man xdg-su' or 'xdg-su --manual' for additional info."
+    fi
+
+    exit 1
+}
+
+#-------------------------------------------------------------
+# Exit script on missing file specified on command line
+
+exit_failure_file_missing()
+{
+    if [ $# -gt 0 ]; then
+        echo "xdg-su: $@" >&2
+    fi
+
+    exit 2
+}
+
+#-------------------------------------------------------------
+# Exit script on failure to locate necessary tool applications
+
+exit_failure_operation_impossible()
+{
+    if [ $# -gt 0 ]; then
+        echo "xdg-su: $@" >&2
+    fi
+
+    exit 3
+}
+
+#-------------------------------------------------------------
+# Exit script on failure returned by a tool application
+
+exit_failure_operation_failed()
+{
+    if [ $# -gt 0 ]; then
+        echo "xdg-su: $@" >&2
+    fi
+
+    exit 4
+}
+
+#------------------------------------------------------------
+# Exit script on insufficient permission to read a specified file
+
+exit_failure_file_permission_read()
+{
+    if [ $# -gt 0 ]; then
+        echo "xdg-su: $@" >&2
+    fi
+
+    exit 5
+}
+
+#------------------------------------------------------------
+# Exit script on insufficient permission to read a specified file
+
+exit_failure_file_permission_write()
+{
+    if [ $# -gt 0 ]; then
+        echo "xdg-su: $@" >&2
+    fi
+
+    exit 6
+}
+
+check_input_file()
+{
+    if [ ! -e "$1" ]; then
+        exit_failure_file_missing "file '$1' does not exist"
+    fi
+    if [ ! -r "$1" ]; then
+        exit_failure_file_permission_read "no permission to read file '$1'"
+    fi
+}
+
+check_vendor_prefix()
+{
+    file=`basename "$1"`
+    case "$file" in
+       [a-zA-Z]*-*)
+         return
+         ;;
+    esac
+
+    echo "xdg-su: filename '$file' does not have a proper vendor prefix" >&2
+    echo 'A vendor prefix consists of alpha characters ([a-zA-Z]) and is terminated' >&2
+    echo 'with a dash ("-"). An example filename is '"'example-$file'" >&2
+    echo "Use --novendor to override or 'xdg-su --manual' for additional info." >&2
+    exit 1
+}
+
+check_output_file()
+{
+    # if the file exists, check if it is writeable
+    # if it does not exists, check if we are allowed to write on the directory
+    if [ -e "$1" ]; then
+        if [ ! -w "$1" ]; then
+            exit_failure_file_permission_write "no permission to write to file '$1'"
+        fi
+    else
+        DIR=`dirname "$1"`
+        if [ ! -w "$DIR" -o ! -x "$DIR" ]; then
+            exit_failure_file_permission_write "no permission to create file '$1'"
+        fi
+    fi
+}
+
+#----------------------------------------
+# Checks for shared commands, e.g. --help
+
+check_common_commands()
+{
+    while [ $# -gt 0 ] ; do
+        parm="$1"
+        shift
+
+        case "$parm" in
+            --help)
+            usage
+            echo "Use 'man xdg-su' or 'xdg-su --manual' for additional info."
+            exit_success
+            ;;
+
+            --manual)
+            manualpage
+            exit_success
+            ;;
+
+            --version)
+            echo "xdg-su 1.0beta2"
+            exit_success
+            ;;
+        esac
+    done
+}
+
+check_common_commands "$@"
+if [ ${XDG_UTILS_DEBUG_LEVEL-0} -lt 1 ]; then
+    # Be silent
+    xdg_redirect_output=" > /dev/null 2> /dev/null"
+else
+    # All output to stderr
+    xdg_redirect_output=" >&2"
+fi
+
+#--------------------------------------
+# Checks for known desktop environments
+# set variable DE to the desktop environments name, lowercase
+
+detectDE()
+{
+    if [ x"$KDE_FULL_SESSION" = x"true" ]; then DE=kde;
+    elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
+    elif xprop -root _DT_SAVE_MODE | grep ' = \"xfce4\"$' >/dev/null 2>&1; then DE=xfce;
+    fi
+}
+
+#----------------------------------------------------------------------------
+
+
+
+su_kde()
+{
+    if [ x"$KDE_SESSION_VERSION" = x"4" ]; then
+        KDESU=`kde4-config --locate kdesu --path exe 2>/dev/null`
+    else
+        KDESU=`which kdesu 2>/dev/null`
+    fi
+    if [ $? -eq 0 ] ; then
+        if [ -z "$user" ] ; then
+             $KDESU -c "$cmd"
+        else
+             $KDESU -u "$user" -c "$cmd"
+        fi
+
+        if [ $? -eq 0 ]; then
+            exit_success
+        else
+            exit_failure_operation_failed
+        fi
+    else
+        su_generic
+    fi
+}
+
+su_gnome()
+{
+    GSU=`which gnomesu 2>/dev/null`
+    if [ $? -ne 0 ] ; then
+        GSU=`which xsu 2>/dev/null`
+    fi
+    if [ $? -eq 0 ] ; then
+        if [ -z "$user" ] ; then
+            $GSU -c "$cmd"
+        else
+            $GSU -u "$user" -c "$cmd"
+        fi
+
+        if [ $? -eq 0 ]; then
+            exit_success
+        else
+            exit_failure_operation_failed
+        fi
+    else
+        su_generic
+    fi
+}
+
+su_generic()
+{
+    if [ -z "$user" ] ; then
+        xterm -geom 60x5 -T "xdg-su: $cmd" -e su -c "$cmd"
+    else
+        xterm -geom 60x5 -T "xdg-su: $cmd" -e su -u "$user" -c "$cmd"
+    fi
+
+    if [ $? -eq 0 ]; then
+        exit_success
+    else
+        exit_failure_operation_failed
+    fi
+}
+
+[ x"$1" != x"" ] || exit_failure_syntax
+
+user=
+cmd=
+while [ $# -gt 0 ] ; do
+    parm="$1"
+    shift
+
+    case "$parm" in
+      -u)
+        if [ -z "$1" ] ; then
+            exit_failure_syntax "user argument missing for -u"
+        fi
+        user="$1"
+        shift
+        ;;
+
+      -c)
+        if [ -z "$1" ] ; then
+            exit_failure_syntax "command argument missing for -c"
+        fi
+        cmd="$1"
+        shift
+        ;;
+
+      -*)
+        exit_failure_syntax "unexpected option '$parm'"
+        ;;
+
+      *)
+        exit_failure_syntax "unexpected argument '$parm'"
+        ;;
+    esac
+done
+
+if [ -z "${cmd}" ] ; then
+    exit_failure_syntax "command missing"
+fi
+
+detectDE
+
+if [ x"$DE" = x"" ]; then
+    XSU=`which xsu 2>/dev/null`
+    if [ $? -eq 0 ] ; then
+        DE=generic
+    fi
+fi
+
+case "$DE" in
+    kde)
+    su_kde
+    ;;
+
+    gnome)
+    su_gnome
+    ;;
+
+    generic)
+    su_generic
+    ;;
+
+    *)
+    [ x"$user" = x"" ] && user=root 
+    exit_failure_operation_impossible "no graphical method available for invoking '$cmd' as '$user'"
+    ;;
+esac