Re: creating extension including dependencies

On 07/09/2015 07:05 PM, Petr Jelinek wrote:
> On 2015-07-07 15:41, Andres Freund wrote:
>> On 2015-07-07 22:36:29 +0900, Fujii Masao wrote:
>>> On Mon, Jun 15, 2015 at 7:50 AM, Petr Jelinek <petr(at)2ndquadrant(dot)com> wrote:
>>>> Hi,
>>>>
>>>> I am getting tired installing manually required extensions manually. I was
>>>> wondering if we might want to add option to CREATE SEQUENCE that would allow
>>>> automatic creation of the extensions required by the extension that is being
>>>> installed by the user.
>>>
>>> I'm wondering how much helpful this feature is. Because, even if we can save
>>> some steps for CREATE EXTENSION by using the feature, we still need to
>>> manually find out, download and install all the extensions that the target
>>> extension depends on. So isn't it better to implement the tool like yum, i.e.,
>>> which performs all those steps almost automatically, rather than the proposed
>>> feature? Maybe it's outside PostgreSQL core.
>>
>> That doesn't seem to make much sense to me. Something like yum can't
>> install everything in all relevant databases. Sure, yum will be used to
>> install dependencies between extensions on the filesystem level.
>>
>> At the minimum I'd like to see that CREATE EXTENSION foo; would install
>> install extension 'bar' if foo dependended on 'bar' if CASCADE is
>> specified. Right now we always error out saying that the dependency on
>> 'bar' is not fullfilled - not particularly helpful.
>
> That's what the proposed patch does (with slightly different syntax but
> syntax is something that can be changed easily).

This seems quite reasonable, but I have to ask: How many extensions are
there out there that depend on another extension? Off the top of my
head, I can't think of any..

- Heikki