Re: Avoid leaking system path from pg_available_extensions

> On May 22, 2026, at 23:40, Matheus Alcantara <matheusssilv97@gmail.com> wrote:
> 
> On 22/05/26 04:25, Jim Jones wrote:
>> On 21/05/2026 17:12, Matheus Alcantara wrote:
>>> I've reproduced the issue and the fix looks correct to me.
>> same here, +1
> 
> Thank you for also testing.
> 
>> I was wondering if creating a constant for it would be, stylistically
>> speaking, a cleaner solution. For instance:
>> #define EXTENSION_SYSTEM_MACRO  "$system"
>> I realize that it's used only inside get_extension_control_directories()
>> but since it is even mentioned in the docs, I guess it wouldn't be a bad
>> idea.
> 
> I'm not against it but I don't think that it's necessary since as you mention, only get_extension_control_directories() use.
> 
> --
> Matheus Alcantara
> EDB: https://www.enterprisedb.com

In theory, I’m not against the idea either. In practice, there are many hard-coded strings in the source tree, and I’m not sure where the right place would be to define this macro.

Since this string is only used in get_extension_control_directories(), and now it is used three times, I defined it at the beginning of the function and undefined it at the end. Let’s see if there are any objections to that.

Please see the attached v2.
Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/