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Tom Lane 866566a690 Avoid dump/reload problems when using both plpython2 and plpython3. 
Commit 803716013d installed a safeguard against loading plpython2
and plpython3 at the same time, but asserted that both could still be
used in the same database, just not in the same session.  However, that's
not actually all that practical because dumping and reloading will fail
(since both libraries necessarily get loaded into the restoring session).
pg_upgrade is even worse, because it checks for missing libraries by
loading every .so library mentioned in the entire installation into one
session, so that you can have only one across the whole cluster.

We can improve matters by not throwing the error immediately in _PG_init,
but only when and if we're asked to do something that requires calling
into libpython.  This ameliorates both of the above situations, since
while execution of CREATE LANGUAGE, CREATE FUNCTION, etc will result in
loading plpython, it isn't asked to do anything interesting (at least
not if check_function_bodies is off, as it will be during a restore).

It's possible that this opens some corner-case holes in which a crash
could be provoked with sufficient effort.  However, since plpython
only exists as an untrusted language, any such crash would require
superuser privileges, making it "don't do that" not a security issue.
To reduce the hazards in this area, the error is still FATAL when it
does get thrown.

Per a report from Paul Jones.  Back-patch to 9.2, which is as far back
as the patch applies without work.  (It could be made to work in 9.1,
but given the lack of previous complaints, I'm disinclined to expend
effort so far back.  We've been pretty desultory about support for
Python 3 in 9.1 anyway.)
 		2016-01-11 19:55:39 -05:00
config Install our "missing" script where PGXS builds can find it. 2015-12-11 16:15:05 -05:00
contrib Sort $(wildcard) output where needed for reproducible build output. 2016-01-05 15:47:05 -05:00
doc doc: Fix typo in logical decoding documentation 2016-01-10 20:12:27 -05:00
src Avoid dump/reload problems when using both plpython2 and plpython3. 2016-01-11 19:55:39 -05:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Add functions for dealing with PGP armor header lines to pgcrypto. 2014-10-01 16:03:39 +03:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
COPYRIGHT Update copyright for 2016 2016-01-02 13:33:40 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
README.git Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
aclocal.m4 Replace our hacked version of ax_pthread.m4 with latest upstream version. 2015-07-08 20:36:06 +03:00
configure Revert "Blind attempt at a Cygwin fix" 2016-01-08 13:18:40 -03:00
configure.in Revert "Blind attempt at a Cygwin fix" 2016-01-08 13:18:40 -03:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.