If an extension library is loaded during pg_upgrade, can it tell?

On Mon, Apr 3, 2017 at 09:53:34PM -0400, Chapman Flack wrote:

Hi,

Is there any distinctive state that could be checked by extension code
to determine that it has been loaded incidentally during the operation
of pg_upgrade rather than under normal conditions?

PL/Java ordinarily checks what version of its schema is around, but
that may be premature while pg_upgrade is doing its thing and the schema
might not be all there yet.

You can check the backend global variable IsBinaryUpgrade to check if
binary upgrade is being performed. Does that help you?

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Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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On 04/03/17 22:08, Bruce Momjian wrote:

On Mon, Apr 3, 2017 at 09:53:34PM -0400, Chapman Flack wrote:

Hi,

Is there any distinctive state that could be checked by extension code
to determine that it has been loaded incidentally during the operation
of pg_upgrade rather than under normal conditions?
...

You can check the backend global variable IsBinaryUpgrade to check if
binary upgrade is being performed. Does that help you?

That sounds like exactly what I'd hoped for. Thanks!

-Chap

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