From f433394e48afbb733b1436276a5a08cd78443164 Mon Sep 17 00:00:00 2001
From: Noah Misch <noah@leadboat.com>
Date: Wed, 3 Apr 2019 17:06:01 -0700
Subject: [PATCH] Handle USE_MODULE_DB for all tests able to use an installed
 postmaster.

When $(MODULES) and $(MODULE_big) are empty, derive the database name
from the first element of $(REGRESS) instead of using a constant string.
When deriving the database name from $(MODULES), use its first element
instead of the entire list; the earlier approach would fail if any
multi-module directory had $(REGRESS) tests.  Treat isolation suites and
src/pl correspondingly.  Under USE_MODULE_DB=1, installcheck-world and
check-world no longer reuse any database name in a given postmaster.
Buildfarm members axolotl, mandrill and frogfish saw spurious "is being
accessed by other users" failures that would not have happened without
database name reuse.  (The CountOtherDBBackends() 5s deadline expired
during DROP DATABASE; a backend for an earlier test suite had used the
same database name and had not yet exited.)  Back-patch to 9.4 (all
supported versions), except bits pertaining to isolation suites.

Concept reviewed by Andrew Dunstan, Andres Freund and Tom Lane.

Discussion: https://postgr.es/m/20190401135213.GE891537@rfd.leadboat.com
---
 src/Makefile.global.in | 25 +++++++++++++++++--------
 src/makefiles/pgxs.mk  | 11 +++++------
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index e8f605095a..b9d86acaa9 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -597,16 +597,25 @@ submake-libpgfeutils: | submake-generated-headers
 #
 # Testing support
 
-PL_TESTDB = pl_regression
-CONTRIB_TESTDB = contrib_regression
-ifneq ($(MODULE_big),)
-  CONTRIB_TESTDB_MODULE = contrib_regression_$(MODULE_big)
-else
-  ifneq ($(MODULES),)
-    CONTRIB_TESTDB_MODULE = contrib_regression_$(MODULES)
+ifneq ($(USE_MODULE_DB),)
+  PL_TESTDB = pl_regression_$(NAME)
+  # Replace this with $(or ...) if we ever require GNU make 3.81.
+  ifneq ($(MODULE_big),)
+    CONTRIB_TESTDB=contrib_regression_$(MODULE_big)
+    ISOLATION_TESTDB=isolation_regression_$(MODULE_big)
   else
-    CONTRIB_TESTDB_MODULE = contrib_regression
+    ifneq ($(MODULES),)
+      CONTRIB_TESTDB=contrib_regression_$(word 1,$(MODULES))
+      ISOLATION_TESTDB=isolation_regression_$(word 1,$(MODULES))
+    else
+      CONTRIB_TESTDB=contrib_regression_$(word 1,$(REGRESS))
+      ISOLATION_TESTDB=isolation_regression_$(word 1,$(ISOLATION))
+    endif
   endif
+else
+  PL_TESTDB = pl_regression
+  CONTRIB_TESTDB = contrib_regression
+  ISOLATION_TESTDB = isolation_regression
 endif
 
 ifdef NO_LOCALE
diff --git a/src/makefiles/pgxs.mk b/src/makefiles/pgxs.mk
index 909a49f5be..271e7eaba8 100644
--- a/src/makefiles/pgxs.mk
+++ b/src/makefiles/pgxs.mk
@@ -380,12 +380,7 @@ distclean maintainer-clean: clean
 
 ifdef REGRESS
 
-# Select database to use for running the tests
-ifneq ($(USE_MODULE_DB),)
-  REGRESS_OPTS += --dbname=$(CONTRIB_TESTDB_MODULE)
-else
-  REGRESS_OPTS += --dbname=$(CONTRIB_TESTDB)
-endif
+REGRESS_OPTS += --dbname=$(CONTRIB_TESTDB)
 
 # When doing a VPATH build, must copy over the data files so that the
 # driver script can find them.  We have to use an absolute path for
@@ -413,6 +408,10 @@ ifndef PGXS
 	$(MAKE) -C $(top_builddir)/src/test/isolation all
 endif
 
+ifdef ISOLATION
+ISOLATION_OPTS += --dbname=$(ISOLATION_TESTDB)
+endif
+
 # Standard rules to run regression tests including multiple test suites.
 # Runs against an installed postmaster.
 ifndef NO_INSTALLCHECK