Throw a useful error message if an extension script file is fed to psql.

We have seen one too many reports of people trying to use 9.1 extension
files in the old-fashioned way of sourcing them in psql.  Not only does
that usually not work (due to failure to substitute for MODULE_PATHNAME
and/or @extschema@), but if it did work they'd get a collection of loose
objects not an extension.  To prevent this, insert an \echo ... \quit
line that prints a suitable error message into each extension script file,
and teach commands/extension.c to ignore lines starting with \echo.
That should not only prevent any adverse consequences of loading a script
file the wrong way, but make it crystal clear to users that they need to
do it differently now.

Tom Lane, following an idea of Andrew Dunstan's.  Back-patch into 9.1
... there is not going to be much value in this if we wait till 9.2.

10 files changed, 30 insertions, 0 deletions

diff --git a/contrib/spi/autoinc--1.0.sql b/contrib/spi/autoinc--1.0.sql
index 9c9df9ce0b..22721e003d 100644
--- a/contrib/spi/autoinc--1.0.sql
+++ b/contrib/spi/autoinc--1.0.sql
@@ -1,5 +1,8 @@
 /* contrib/spi/autoinc--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION autoinc" to load this file. \quit
+
 CREATE FUNCTION autoinc()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
diff --git a/contrib/spi/autoinc--unpackaged--1.0.sql b/contrib/spi/autoinc--unpackaged--1.0.sql
index 232e9170fc..cfe2065d3d 100644
--- a/contrib/spi/autoinc--unpackaged--1.0.sql
+++ b/contrib/spi/autoinc--unpackaged--1.0.sql
@@ -1,3 +1,6 @@
 /* contrib/spi/autoinc--unpackaged--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION autoinc" to load this file. \quit
+
 ALTER EXTENSION autoinc ADD function autoinc();
diff --git a/contrib/spi/insert_username--1.0.sql b/contrib/spi/insert_username--1.0.sql
index bd854587e0..0deb0bf3f8 100644
--- a/contrib/spi/insert_username--1.0.sql
+++ b/contrib/spi/insert_username--1.0.sql
@@ -1,5 +1,8 @@
 /* contrib/spi/insert_username--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION insert_username" to load this file. \quit
+
 CREATE FUNCTION insert_username()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
diff --git a/contrib/spi/insert_username--unpackaged--1.0.sql b/contrib/spi/insert_username--unpackaged--1.0.sql
index f53cb690f1..91a5d1f309 100644
--- a/contrib/spi/insert_username--unpackaged--1.0.sql
+++ b/contrib/spi/insert_username--unpackaged--1.0.sql
@@ -1,3 +1,6 @@
 /* contrib/spi/insert_username--unpackaged--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION insert_username" to load this file. \quit
+
 ALTER EXTENSION insert_username ADD function insert_username();
diff --git a/contrib/spi/moddatetime--1.0.sql b/contrib/spi/moddatetime--1.0.sql
index 97cc63289f..2ee61b814f 100644
--- a/contrib/spi/moddatetime--1.0.sql
+++ b/contrib/spi/moddatetime--1.0.sql
@@ -1,5 +1,8 @@
 /* contrib/spi/moddatetime--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION moddatetime" to load this file. \quit
+
 CREATE FUNCTION moddatetime()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
diff --git a/contrib/spi/moddatetime--unpackaged--1.0.sql b/contrib/spi/moddatetime--unpackaged--1.0.sql
index f3a0a96837..caa49ce0dc 100644
--- a/contrib/spi/moddatetime--unpackaged--1.0.sql
+++ b/contrib/spi/moddatetime--unpackaged--1.0.sql
@@ -1,3 +1,6 @@
 /* contrib/spi/moddatetime--unpackaged--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION moddatetime" to load this file. \quit
+
 ALTER EXTENSION moddatetime ADD function moddatetime();
diff --git a/contrib/spi/refint--1.0.sql b/contrib/spi/refint--1.0.sql
index 9e5d931df5..faf797c215 100644
--- a/contrib/spi/refint--1.0.sql
+++ b/contrib/spi/refint--1.0.sql
@@ -1,5 +1,8 @@
 /* contrib/spi/refint--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION refint" to load this file. \quit
+
 CREATE FUNCTION check_primary_key()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
diff --git a/contrib/spi/refint--unpackaged--1.0.sql b/contrib/spi/refint--unpackaged--1.0.sql
index 54fece055a..cd9c9b0c36 100644
--- a/contrib/spi/refint--unpackaged--1.0.sql
+++ b/contrib/spi/refint--unpackaged--1.0.sql
@@ -1,4 +1,7 @@
 /* contrib/spi/refint--unpackaged--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION refint" to load this file. \quit
+
 ALTER EXTENSION refint ADD function check_primary_key();
 ALTER EXTENSION refint ADD function check_foreign_key();
diff --git a/contrib/spi/timetravel--1.0.sql b/contrib/spi/timetravel--1.0.sql
index b68cf2f247..c34ca09965 100644
--- a/contrib/spi/timetravel--1.0.sql
+++ b/contrib/spi/timetravel--1.0.sql
@@ -1,5 +1,8 @@
 /* contrib/spi/timetravel--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION timetravel" to load this file. \quit
+
 CREATE FUNCTION timetravel()
 RETURNS trigger
 AS 'MODULE_PATHNAME'
diff --git a/contrib/spi/timetravel--unpackaged--1.0.sql b/contrib/spi/timetravel--unpackaged--1.0.sql
index e3716afe95..dd07a133a5 100644
--- a/contrib/spi/timetravel--unpackaged--1.0.sql
+++ b/contrib/spi/timetravel--unpackaged--1.0.sql
@@ -1,5 +1,8 @@
 /* contrib/spi/timetravel--unpackaged--1.0.sql */
 
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION timetravel" to load this file. \quit
+
 ALTER EXTENSION timetravel ADD function timetravel();
 ALTER EXTENSION timetravel ADD function set_timetravel(name,integer);
 ALTER EXTENSION timetravel ADD function get_timetravel(name);