database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-15 19:21:59 +03:00
Code Activity

Further fixes for quoted-list GUC values in pg_dump and ruleutils.c.

Browse Source 
Commits 742869946 et al turn out to be a couple bricks shy of a load.
We were dumping the stored values of GUC_LIST_QUOTE variables as they
appear in proconfig or setconfig catalog columns.  However, although that
quoting rule looks a lot like SQL-identifier double quotes, there are two
critical differences: empty strings ("") are legal, and depending on which
variable you're considering, values longer than NAMEDATALEN might be valid
too.  So the current technique fails altogether on empty-string list
entries (as reported by Steven Winfield in bug #15248) and it also risks
truncating file pathnames during dump/reload of GUC values that are lists
of pathnames.

To fix, split the stored value without any downcasing or truncation,
and then emit each element as a SQL string literal.

This is a tad annoying, because we now have three copies of the
comma-separated-string splitting logic in varlena.c as well as a fourth
one in dumputils.c.  (Not to mention the randomly-different-from-those
splitting logic in libpq...)  I looked at unifying these, but it would
be rather a mess unless we're willing to tweak the API definitions of
SplitIdentifierString, SplitDirectoriesString, or both.  That might be
worth doing in future; but it seems pretty unsafe for a back-patched
bug fix, so for now accept the duplication.

Back-patch to all supported branches, as the previous fix was.

Discussion: https://postgr.es/m/7585.1529435872@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2018-07-31 13:00:07 -04:00
parent 23ca82d7ef
commit f3eb76b399
8 changed files with 326 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/test/regress/expected/rules.out
View File

@ -3160,21 +3160,21 @@ CREATE FUNCTION func_with_set_params() RETURNS integer
SET extra_float_digits TO 2
SET work_mem TO '4MB'
SET datestyle to iso, mdy
SET local_preload_libraries TO "Mixed/Case", 'c:/"a"/path'
SET local_preload_libraries TO "Mixed/Case", 'c:/''a"/path', '', '0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'
IMMUTABLE STRICT;
SELECT pg_get_functiondef('func_with_set_params()'::regprocedure);
pg_get_functiondef
---------------------------------------------------------------
CREATE OR REPLACE FUNCTION public.func_with_set_params() +
RETURNS integer +
LANGUAGE sql +
IMMUTABLE STRICT +
SET search_path TO pg_catalog +
SET extra_float_digits TO '2' +
SET work_mem TO '4MB' +
SET "DateStyle" TO 'iso, mdy' +
SET local_preload_libraries TO "Mixed/Case", "c:/""a""/path"+
AS $function$select 1;$function$ +
pg_get_functiondef
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
CREATE OR REPLACE FUNCTION public.func_with_set_params() +
RETURNS integer +
LANGUAGE sql +
IMMUTABLE STRICT +
SET search_path TO 'pg_catalog' +
SET extra_float_digits TO '2' +
SET work_mem TO '4MB' +
SET "DateStyle" TO 'iso, mdy' +
SET local_preload_libraries TO 'Mixed/Case', 'c:/''a"/path', '', '0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'+
AS $function$select 1;$function$ +
(1 row)

2
src/test/regress/sql/rules.sql
View File

@ -1164,7 +1164,7 @@ CREATE FUNCTION func_with_set_params() RETURNS integer
SET extra_float_digits TO 2
SET work_mem TO '4MB'
SET datestyle to iso, mdy
SET local_preload_libraries TO "Mixed/Case", 'c:/"a"/path'
SET local_preload_libraries TO "Mixed/Case", 'c:/''a"/path', '', '0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'
IMMUTABLE STRICT;
SELECT pg_get_functiondef('func_with_set_params()'::regprocedure);