John Keeping <j...@keeping.me.uk> writes:
> On Thu, Apr 18, 2013 at 03:40:41PM -0700, Junio C Hamano wrote:
>> John Keeping <j...@keeping.me.uk> writes:
>>
>> > +relative_path ()
>> > +{
>> > + local target curdir result
>> > + target=$1
>> > + curdir=${2-$wt_prefix}
>> > + curdir=${curdir%/}
>> > + result=
>> > +
>> > + while test -n "$curdir"
>> > + do
>> > + case "$target" in
>> > + "$curdir/"*)
>> > + target=${target#$curdir/}
>> > + break
>> > + ;;
>> > + esac
>>
>> Could $curdir have glob wildcard to throw this part of the logic
>> off? It is OK to have limitations like "you cannot have a glob
>> characters in your path to submodule working tree" (at least until
>> we start rewriting these in C or Perl or Python), but we need to be
>> aware of them.
>
> I think the use of "#" instead of "##" saves us here because even with a
> wildcard in $curdir the case statement matches literally,
If you have curdir=a*b and target=adropb/c/d/e, the chopping itself
target=${target#$curdir/}
would happily chop "adropb/" from the target, but because the dq
around "$curdir/"* in the case arm label enforces that target must
literally match curdir followed by a slash, we do not even come to
the chomping part.
I still have not convinced myself that it is impossible for somebody
more clever than I to craft a pair of target and curdir that breaks
it, though. (target="a*b/c/d", curdir="a*b") is correctly chopped,
so that is not it.
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