[postgis-tickets] [PostGIS] #4643: PostgreSQL 13 no longer supports FROM in CREATE EXTENSION

[PostGIS]

#4643: PostgreSQL 13 no longer supports FROM in CREATE EXTENSION
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  Reporter:  robe                   |      Owner:  strk
      Type:  defect                 |     Status:  new
  Priority:  blocker                |  Milestone:  PostGIS 3.1.0
 Component:  build/upgrade/install  |    Version:  master
Resolution:                         |   Keywords:
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Comment (by robe):

 notes from that commit -
 https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=70a77320


 {{{
 Remove support for upgrading extensions from "unpackaged" state.

 Andres Freund pointed out that allowing non-superusers to run
 "CREATE EXTENSION ... FROM unpackaged" has security risks, since
 the unpackaged-to-1.0 scripts don't try to verify that the existing
 objects they're modifying are what they expect.  Just attaching such
 objects to an extension doesn't seem too dangerous, but some of them
 do more than that.

 We could have resolved this, perhaps, by still requiring superuser
 privilege to use the FROM option.  However, it's fair to ask just what
 we're accomplishing by continuing to lug the unpackaged-to-1.0 scripts
 forward.  None of them have received any real testing since 9.1 days,
 so they may not even work anymore (even assuming that one could still
 load the previous "loose" object definitions into a v13 database).
 And an installation that's trying to go from pre-9.1 to v13 or later
 in one jump is going to have worse compatibility problems than whether
 there's a trivial way to convert their contrib modules into extension
 style.

 Hence, let's just drop both those scripts and the core-code support
 for "CREATE EXTENSION ... FROM".

 Discussion:
 https://postgr.es/m/20200213233015.r6rnubcvl4egdh5r@alap3.anarazel.de
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4643#comment:3>
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