Split TESTDIR into TESTLOGDIR and TESTDATADIR

The motivation for this is twofold. For one the meson patchset would like to
have more control over the logfiles. For another, the log file location for
tap tests (tmp_check/log) is not symmetric to the log location for
pg_regress/isolation tests (log/).

This commit does not change the default location for log files for tap tests,
as that'd break the buildfarm log collection, it just provides the
infrastructure for doing so.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/1131990.1660661896@sss.pgh.pa.us
Discussion: https://postgr.es/m/20220828170806.GN2342@telsasoft.com

Author: anarazel

src/Makefile.global.in

@@ -451,7 +451,9 @@ echo "+++ tap install-check in $(subdir) +++" && \
 rm -rf '$(CURDIR)'/tmp_check && \
 $(MKDIR_P) '$(CURDIR)'/tmp_check && \
 cd $(srcdir) && \
-   TESTDIR='$(CURDIR)/tmp_check' PATH="$(bindir):$(CURDIR):$$PATH" \
+   TESTLOGDIR='$(CURDIR)/tmp_check/log' \
+   TESTDATADIR='$(CURDIR)/tmp_check' \
+   PATH="$(bindir):$(CURDIR):$$PATH" \
    PGPORT='6$(DEF_PGPORT)' top_builddir='$(CURDIR)/$(top_builddir)' \
    PG_REGRESS='$(CURDIR)/$(top_builddir)/src/test/regress/pg_regress' \
    $(PROVE) $(PG_PROVE_FLAGS) $(PROVE_FLAGS) $(if $(PROVE_TESTS),$(PROVE_TESTS),t/*.pl)
@@ -462,7 +464,9 @@ echo "+++ tap install-check in $(subdir) +++" && \
 rm -rf '$(CURDIR)'/tmp_check && \
 $(MKDIR_P) '$(CURDIR)'/tmp_check && \
 cd $(srcdir) && \
-   TESTDIR='$(CURDIR)/tmp_check' PATH="$(bindir):$(CURDIR):$$PATH" \
+   TESTLOGDIR='$(CURDIR)/tmp_check/log' \
+   TESTDATADIR='$(CURDIR)/tmp_check' \
+   PATH="$(bindir):$(CURDIR):$$PATH" \
    PGPORT='6$(DEF_PGPORT)' top_builddir='$(top_builddir)' \
    PG_REGRESS='$(top_builddir)/src/test/regress/pg_regress' \
    $(PROVE) $(PG_PROVE_FLAGS) $(PROVE_FLAGS) $(if $(PROVE_TESTS),$(PROVE_TESTS),t/*.pl)
@@ -474,7 +478,10 @@ echo "+++ tap check in $(subdir) +++" && \
 rm -rf '$(CURDIR)'/tmp_check && \
 $(MKDIR_P) '$(CURDIR)'/tmp_check && \
 cd $(srcdir) && \
-   TESTDIR='$(CURDIR)/tmp_check' $(with_temp_install) PGPORT='6$(DEF_PGPORT)' \
+   TESTLOGDIR='$(CURDIR)/tmp_check/log' \
+   TESTDATADIR='$(CURDIR)/tmp_check' \
+   $(with_temp_install) \
+   PGPORT='6$(DEF_PGPORT)' \
    PG_REGRESS='$(CURDIR)/$(top_builddir)/src/test/regress/pg_regress' \
    $(PROVE) $(PG_PROVE_FLAGS) $(PROVE_FLAGS) $(if $(PROVE_TESTS),$(PROVE_TESTS),t/*.pl)
 endef

src/bin/psql/t/010_tab_completion.pl

@@ -70,9 +70,9 @@
 # to run in the build directory so that we can use relative paths to
 # access the tab_comp_dir subdirectory; otherwise the output from filename
 # completion tests is too variable.
-if ($ENV{TESTDIR})
+if ($ENV{TESTDATADIR})
 {
-	chdir $ENV{TESTDIR} or die "could not chdir to \"$ENV{TESTDIR}\": $!";
+	chdir $ENV{TESTDATADIR} or die "could not chdir to \"$ENV{TESTDATADIR}\": $!";
 }
 
 # Create some junk files for filename completion testing.

src/test/perl/PostgreSQL/Test/Utils.pm

@@ -189,11 +189,11 @@ INIT
 	# test may still fail, but it's more likely to report useful facts.
 	$SIG{PIPE} = 'IGNORE';
 
-	# Determine output directories, and create them.  The base path is the
-	# TESTDIR environment variable, which is normally set by the invoking
-	# Makefile.
-	$tmp_check = $ENV{TESTDIR} ? "$ENV{TESTDIR}" : "tmp_check";
-	$log_path = "$tmp_check/log";
+	# Determine output directories, and create them.  The base paths are the
+	# TESTDATADIR / TESTLOGDIR environment variables, which are normally set
+	# by the invoking Makefile.
+	$tmp_check = $ENV{TESTDATADIR} ? "$ENV{TESTDATADIR}" : "tmp_check";
+	$log_path = $ENV{TESTLOGDIR} ? "$ENV{TESTLOGDIR}" : "log";
 
 	mkdir $tmp_check;
 	mkdir $log_path;

src/tools/msvc/vcregress.pl

@@ -291,7 +291,9 @@ sub tap_check
 	$ENV{PG_REGRESS}    = "$topdir/$Config/pg_regress/pg_regress";
 	$ENV{REGRESS_SHLIB} = "$topdir/src/test/regress/regress.dll";
 
-	$ENV{TESTDIR} = "$dir/tmp_check";
+	$ENV{TESTDATADIR} = "$dir/tmp_check";
+	$ENV{TESTLOGDIR} = "$dir/tmp_check/log";
+
 	my $module = basename $dir;
 	# add the module build dir as the second element in the PATH
 	$ENV{PATH} =~ s!;!;$topdir/$Config/$module;!;