[aur-dev] [PATCH] Fix: FS#13189, infinite variable replacement cycle

Gergely Imreh imrehg at gmail.com
Fri Feb 13 12:05:24 EST 2009

Yeah, except I missed attaching the patch, bummer...

2009/2/14 Gergely Imreh <imrehg at gmail.com>:
> Hi,
>  Bug report FS#13189 brought to light a situation when certain lines
> in the PKGBUILD would cause the pkgbuild.php end up in an infinite
> cycle.
>  Example is a line such as:
>  foo=$foo
>  or as in the bug report:
>  In the first case, e.g. $foo would be recognized as a call for
> replacement for "foo", and then replaced with "$foo", then checked
> again for values to replace.... you can guess how well it goes...
>  This patch removes this situation by setting the variable value to
> empty (to ""), if it recognizes that there would be such a cycle. This
> behaviour is not exactly what bash would do, since e.g. if there are
> two lines in the PKGBUILD such as:
>  foo=something
>  foo=$foo
>  then in bash in the end foo would have a proper value ("something"),
> while in our case it would be empty. In my opinion this is not a
> problem, since generally these kind of PKGBUILDs could be considered
> malformed.....
>  The eval type parameter substitution is not changed at the moment,
> since even if does not give the same value as bash, it does not cause
> such cycle as the normal substitution.
>  Cheers,
>        Greg

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