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, 25 deletions

diff --git a/contrib/fuzzystrmatch/Makefile b/contrib/fuzzystrmatch/Makefile
index 60cf5947fee..0704894f880 100644
--- a/contrib/fuzzystrmatch/Makefile
+++ b/contrib/fuzzystrmatch/Makefile
@@ -7,8 +7,7 @@ OBJS = \
 	fuzzystrmatch.o
 
 EXTENSION = fuzzystrmatch
-DATA = fuzzystrmatch--1.1.sql fuzzystrmatch--1.0--1.1.sql \
-	fuzzystrmatch--unpackaged--1.0.sql
+DATA = fuzzystrmatch--1.1.sql fuzzystrmatch--1.0--1.1.sql
 PGFILEDESC = "fuzzystrmatch - similarities and distance between strings"
 
 REGRESS = fuzzystrmatch
diff --git a/contrib/fuzzystrmatch/fuzzystrmatch--unpackaged--1.0.sql b/contrib/fuzzystrmatch/fuzzystrmatch--unpackaged--1.0.sql
deleted file mode 100644
index 14491a9fa72..00000000000
--- a/contrib/fuzzystrmatch/fuzzystrmatch--unpackaged--1.0.sql
+++ /dev/null
@@ -1,23 +0,0 @@
-/* contrib/fuzzystrmatch/fuzzystrmatch--unpackaged--1.0.sql */
-
--- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION fuzzystrmatch FROM unpackaged" to load this file. \quit
-
-ALTER EXTENSION fuzzystrmatch ADD function levenshtein(text,text);
-ALTER EXTENSION fuzzystrmatch ADD function levenshtein(text,text,integer,integer,integer);
-ALTER EXTENSION fuzzystrmatch ADD function metaphone(text,integer);
-ALTER EXTENSION fuzzystrmatch ADD function soundex(text);
-ALTER EXTENSION fuzzystrmatch ADD function text_soundex(text);
-ALTER EXTENSION fuzzystrmatch ADD function difference(text,text);
-ALTER EXTENSION fuzzystrmatch ADD function dmetaphone(text);
-ALTER EXTENSION fuzzystrmatch ADD function dmetaphone_alt(text);
-
--- these functions were not in 9.0
-
-CREATE FUNCTION levenshtein_less_equal (text,text,int) RETURNS int
-AS 'MODULE_PATHNAME','levenshtein_less_equal'
-LANGUAGE C IMMUTABLE STRICT;
-
-CREATE FUNCTION levenshtein_less_equal (text,text,int,int,int,int) RETURNS int
-AS 'MODULE_PATHNAME','levenshtein_less_equal_with_costs'
-LANGUAGE C IMMUTABLE STRICT;