Question

I found a crash using TWiki. At first, TWiki crashed only for some users .... Yes, I was detecting if user are logged or not just testing %USERNAME% against %WIKINAME (I am using APACHE + LDAP), using IF, but in fact, the crash has nothing to do with this, just amazing .

Well, twiki.org crash also, so it iseasy to make understand : see VarIFcrashTWiki

What is the problem :

%IF{"%USERNAME% = %WIKINAME%" then="YES" else="NO"}%

if %WIKINAME% (or any other VAR or string starts with And), TWiki will crash, case of all Andreas wiki users here

It is possible to avoid this problem simply adding '' around vars :

%IF{"'%USERNAME%' = '%WIKINAME%'" then="YES" else="NO"}%

So, something like :

   * Set A = someText
   * Set B = AndSomeText

%IF{"'%A%' = '%B%'" then="YES" else="NO"}%

will crash TWiki too if your remove the '' chars.

Environment

-- PatrickNomblot - 07 Jul 2006

Answer

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Thanks for reporting. Bugs:Item2607 filed.

-- PeterThoeny - 07 Jul 2006

The easy workaround would be to write

%IF{"$ USERNAME = $ WIKINAME" then="YES" else="NO"}%

-- HaraldJoerg - 07 Jul 2006

Adding '' is also a nice solution as I describe it. The idea is in fact simply to enhance TWiki stability against topic contents.

-- PatrickNomblot - 04 Aug 2006