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

2 files changed, 1 insertions, 11 deletions

diff --git a/src/test/modules/test_parser/Makefile b/src/test/modules/test_parser/Makefile
index 71eb38de6db..5327080376e 100644
--- a/src/test/modules/test_parser/Makefile
+++ b/src/test/modules/test_parser/Makefile
@@ -7,7 +7,7 @@ OBJS = \
 PGFILEDESC = "test_parser - example of a custom parser for full-text search"
 
 EXTENSION = test_parser
-DATA = test_parser--1.0.sql test_parser--unpackaged--1.0.sql
+DATA = test_parser--1.0.sql
 
 REGRESS = test_parser
 
diff --git a/src/test/modules/test_parser/test_parser--unpackaged--1.0.sql b/src/test/modules/test_parser/test_parser--unpackaged--1.0.sql
deleted file mode 100644
index 9ebc4b3fbee..00000000000
--- a/src/test/modules/test_parser/test_parser--unpackaged--1.0.sql
+++ /dev/null
@@ -1,10 +0,0 @@
-/* src/test/modules/test_parser/test_parser--unpackaged--1.0.sql */
-
--- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION test_parser FROM unpackaged" to load this file. \quit
-
-ALTER EXTENSION test_parser ADD function testprs_start(internal,integer);
-ALTER EXTENSION test_parser ADD function testprs_getlexeme(internal,internal,internal);
-ALTER EXTENSION test_parser ADD function testprs_end(internal);
-ALTER EXTENSION test_parser ADD function testprs_lextype(internal);
-ALTER EXTENSION test_parser ADD text search parser testparser;