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Prevent extensions from creating custom GUCs that are GUC_LIST_QUOTE.

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Pending some solution for the problems noted in commit 742869946,
disallow dynamic creation of GUC_LIST_QUOTE variables.

If there are any extensions out there using this feature, they'd not
be happy for us to start enforcing this rule in minor releases, so
this is a HEAD-only change.  The previous commit didn't make things
any worse than they already were for such cases.

Discussion: https://postgr.es/m/20180111064900.GA51030@paquier.xyz
This commit is contained in:
Tom Lane 2018-03-21 20:11:07 -04:00
parent 742869946f
commit 846b5a5257
1 changed files with 9 additions and 0 deletions
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9
src/backend/utils/misc/guc.c
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@ -7606,6 +7606,15 @@ init_custom_variable(const char *name,
!process_shared_preload_libraries_in_progress)
elog(FATAL, "cannot create PGC_POSTMASTER variables after startup");
/*
* We can't support custom GUC_LIST_QUOTE variables, because the wrong
* things would happen if such a variable were set or pg_dump'd when the
* defining extension isn't loaded. Again, treat this as fatal because
* the loadable module may be partly initialized already.
*/
if (flags & GUC_LIST_QUOTE)
elog(FATAL, "extensions cannot define GUC_LIST_QUOTE variables");
/*
* Before pljava commit 398f3b876ed402bdaec8bc804f29e2be95c75139
* (2015-12-15), two of that module's PGC_USERSET variables facilitated