Don't let root run unopkg without --shared option

with the exception of -h|--help.

It only makes sense to run unopkg with root priviledges if adding,
deleting etc. extensions system-wide for all users (i.e with --shared
switch ). In all other cases it only messes up access rights to
extensions, so prevent that. Furtheron, running LibO from the root
account (and installing root-user-local extensions) is not a
supported scenario.

Change-Id: I2817f62ae0bb400cefed240e792873f563fbe76e
Reviewed-on: https://gerrit.libreoffice.org/16250
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

desktop/scripts/unopkg.sh

@@ -49,17 +49,32 @@ AIX)
     ;;
 esac
 
+HELP_MODE=0
+SHARED_MODE=0
 #collect all bootstrap variables specified on the command line
 #so that they can be passed as arguments to javaldx later on
 for arg in $@
 do
   case "$arg" in
        -env:*) BOOTSTRAPVARS=$BOOTSTRAPVARS" ""$arg";;
-       --shared) umask 0022;;
+       --shared)
+           umask 0022
+           SHARED_MODE=1
+           ;;
            # make sure shared extensions will be readable by all users
+       -h|--help) HELP_MODE=1;;
   esac
 done
 
+# we don't really want root to run unopkg without --shared option
+if [ "$EUID" -eq 0 ]; then
+    # but we might at least let him read help
+    if [ $SHARED_MODE -eq 0 ] && [ $HELP_MODE -eq 0 ]; then
+         echo "Cannot run '${0} $*' as root (did you forget --shared option?)"
+         exit 1
+    fi
+fi
+
 # extend the ld_library_path for java: javaldx checks the sofficerc for us
 if [ -x "${sd_prog}/javaldx" ] ; then
     my_path=`"${sd_prog}/javaldx" $BOOTSTRAPVARS \