Hello,

it seems su-to-root wrapper script doesn't handle well calls which use multiple commands.

Scenario where I've discovered this:
After installing system-config-lvm package (1.1.16-1), the utility doesn't run under a non-root user (using standard GNOME 3.4). It tries to run the following command:
su-to-root -X -c "invoke-rc.d lvm2 start ; /usr/share/system-config-lvm/system-config-lvm.py";

It seems that without invoking a shell to handle the two commands only the first will be run under root privilages.

Here's a fix using printf that seems to correct the problem (only for gksu, which is used in wheezy):
@@ -105,3 +105,3 @@
     case $SU_TO_ROOT_X in
-      gksu) gksu -u "$PRIV" "$COMMAND";;
+      gksu) gksu -u "$PRIV" "sh -c $(printf %q "$COMMAND")";;
       gksudo) gksudo -u "$PRIV" "$COMMAND";;

p.s. if this is more of a gksu issue, please forward where necessary

Regards,
Ivan

Hello Ivan,
the issue is not so much the su-to-root script but rather the underlying su engines
which may have different calling convention.

I cannot help but think that using multiple commands in a single su-to-root
invocation is pushing the design too far.

Well, it would be useful to compare the behavior of all the su- variants.

Thanks for using Debian menu!

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Elvis Edorh