[gnunet] 02/02: -fix issue with multiple dbinit running concurrently

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grothoff pushed a commit to branch master
in repository gnunet.

commit b6bdddad94a47f02b426ba6db2bbf27bcd2b2a2c
Author: Christian Grothoff <grothoff@gnunet.org>
AuthorDate: Sun Aug 27 14:05:42 2023 +0200

    -fix issue with multiple dbinit running concurrently
---
 src/pq/versioning.sql | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/pq/versioning.sql b/src/pq/versioning.sql
index 116f409b7..c7fa81213 100644
--- a/src/pq/versioning.sql
+++ b/src/pq/versioning.sql
@@ -146,12 +146,17 @@
 
 BEGIN;
 
+-- Added by Christian Grothoff to support concurrency, see
+-- 
https://stackoverflow.com/questions/29900845/create-schema-if-not-exists-raises-duplicate-key-error?rq=4
+LOCK TABLE pg_catalog.pg_namespace;
+
+
 -- This file adds versioning support to database it will be loaded to.
 -- It requires that PL/pgSQL is already loaded - will raise exception 
otherwise.
 -- All versioning "stuff" (tables, functions) is in "_v" schema.
 
 -- All functions are defined as 'RETURNS SETOF INT4' to be able to make them 
to RETURN literally nothing (0 rows).
--- >> RETURNS VOID<< IS similar, but it still outputs "empty line" in psql 
when calling.
+-- >> RETURNS VOID<< IS similar, but it still outputs "empty line" in psql 
when calling
 CREATE SCHEMA IF NOT EXISTS _v;
 COMMENT ON SCHEMA _v IS 'Schema for versioning data and functionality.';
 

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