Re: [PATCH] git-quiltimport: fix security risk because of un-sanitized $level.

> Pierre Habouzit <madcoder@debian.org> writes:
> 
> > Signed-off-by: Pierre Habouzit <madcoder@debian.org>
> > ---
> >
> >   I assume that nobody will have a series with -p1000 in it :)
> >   sorry for this gross mistake in the first place.
> >
> >   [ for the inattentive readers $level was used without quoting, for
> >     good reasons as it's sometime empty and then we don't want to pass
> >     an empty argument to git-apply, though someone could use that to run
> >     arbitrary commands, not nice ]
> 
> A traditional way to deal with that situation in shell scripts is to use
> this idiom:
> 
> 	${var_that_may_not_be_set+"$var_that_may_not_be_set"}