Revert "Rename contrib module basic_archive to basic_wal_module"

This reverts commit 0ad3c60, as per feedback from Tom Lane, Robert Haas
and Andres Freund.  The new name used for the module had little
support.

This moves back to basic_archive as module name, and we will likely use
that as template for recovery modules, as well.

Discussion: https://postgr.es/m/CA+TgmoYG5uGOp7DGFT5gzC1kKFWGjkLSj_wOQxGhfMcvVEiKGA@mail.gmail.com

Author: michaelpq

contrib/Makefile

@@ -9,7 +9,7 @@ SUBDIRS = \
 		amcheck		\
 		auth_delay	\
 		auto_explain	\
-		basic_wal_module	\
+		basic_archive	\
 		basebackup_to_shell	\
 		bloom		\
 		btree_gin	\

contrib/basic_wal_module/.gitignore renamed to contrib/basic_archive/.gitignore

@@ -1,11 +1,11 @@
-# contrib/basic_wal_module/Makefile
+# contrib/basic_archive/Makefile
 
-MODULES = basic_wal_module
-PGFILEDESC = "basic_wal_module - basic write-ahead log module"
+MODULES = basic_archive
+PGFILEDESC = "basic_archive - basic archive module"
 
-REGRESS = basic_wal_module
-REGRESS_OPTS = --temp-config $(top_srcdir)/contrib/basic_wal_module/basic_wal_module.conf
-# Disabled because these tests require "shared_preload_libraries=basic_wal_module",
+REGRESS = basic_archive
+REGRESS_OPTS = --temp-config $(top_srcdir)/contrib/basic_archive/basic_archive.conf
+# Disabled because these tests require "shared_preload_libraries=basic_archive",
 # which typical installcheck users do not have (e.g. buildfarm clients).
 NO_INSTALLCHECK = 1
 
@@ -14,7 +14,7 @@ PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)
 include $(PGXS)
 else
-subdir = contrib/basic_wal_module
+subdir = contrib/basic_archive
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 include $(top_srcdir)/contrib/contrib-global.mk

contrib/basic_wal_module/Makefile renamed to contrib/basic_archive/Makefile

@@ -1,6 +1,6 @@
 /*-------------------------------------------------------------------------
  *
- * basic_wal_module.c
+ * basic_archive.c
  *
  * This file demonstrates a basic archive library implementation that is
  * roughly equivalent to the following shell command:
@@ -20,7 +20,7 @@
  * Copyright (c) 2022-2023, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  contrib/basic_wal_module/basic_wal_module.c
+ *	  contrib/basic_archive/basic_archive.c
  *
  *-------------------------------------------------------------------------
  */
@@ -41,7 +41,7 @@
 PG_MODULE_MAGIC;
 
 static char *archive_directory = NULL;
-static MemoryContext basic_wal_module_context;
+static MemoryContext basic_archive_context;
 
 static bool basic_archive_configured(void);
 static bool basic_archive_file(const char *file, const char *path);
@@ -57,7 +57,7 @@ static bool compare_files(const char *file1, const char *file2);
 void
 _PG_init(void)
 {
-	DefineCustomStringVariable("basic_wal_module.archive_directory",
+	DefineCustomStringVariable("basic_archive.archive_directory",
 							   gettext_noop("Archive file destination directory."),
 							   NULL,
 							   &archive_directory,
@@ -66,11 +66,11 @@ _PG_init(void)
 							   0,
 							   check_archive_directory, NULL, NULL);
 
-	MarkGUCPrefixReserved("basic_wal_module");
+	MarkGUCPrefixReserved("basic_archive");
 
-	basic_wal_module_context = AllocSetContextCreate(TopMemoryContext,
-													 "basic_wal_module",
-													 ALLOCSET_DEFAULT_SIZES);
+	basic_archive_context = AllocSetContextCreate(TopMemoryContext,
+												  "basic_archive",
+												  ALLOCSET_DEFAULT_SIZES);
 }
 
 /*
@@ -156,7 +156,7 @@ basic_archive_file(const char *file, const char *path)
 	 * we can easily reset it during error recovery (thus avoiding memory
 	 * leaks).
 	 */
-	oldcontext = MemoryContextSwitchTo(basic_wal_module_context);
+	oldcontext = MemoryContextSwitchTo(basic_archive_context);
 
 	/*
 	 * Since the archiver operates at the bottom of the exception stack,
@@ -183,7 +183,7 @@ basic_archive_file(const char *file, const char *path)
 
 		/* Reset our memory context and switch back to the original one */
 		MemoryContextSwitchTo(oldcontext);
-		MemoryContextReset(basic_wal_module_context);
+		MemoryContextReset(basic_archive_context);
 
 		/* Remove our exception handler */
 		PG_exception_stack = NULL;
@@ -206,7 +206,7 @@ basic_archive_file(const char *file, const char *path)
 
 	/* Reset our memory context and switch back to the original one */
 	MemoryContextSwitchTo(oldcontext);
-	MemoryContextReset(basic_wal_module_context);
+	MemoryContextReset(basic_archive_context);
 
 	return true;
 }
@@ -221,7 +221,7 @@ basic_archive_file_internal(const char *file, const char *path)
 	uint64		epoch;			/* milliseconds */
 
 	ereport(DEBUG3,
-			(errmsg("archiving \"%s\" via basic_wal_module", file)));
+			(errmsg("archiving \"%s\" via basic_archive", file)));
 
 	snprintf(destination, MAXPGPATH, "%s/%s", archive_directory, file);
 
@@ -285,7 +285,7 @@ basic_archive_file_internal(const char *file, const char *path)
 	(void) durable_rename(temp, destination, ERROR);
 
 	ereport(DEBUG1,
-			(errmsg("archived \"%s\" via basic_wal_module", file)));
+			(errmsg("archived \"%s\" via basic_archive", file)));
 }
 
 /*

contrib/basic_wal_module/basic_wal_module.c renamed to contrib/basic_archive/basic_archive.c

@@ -0,0 +1,4 @@
+archive_mode = on
+archive_library = 'basic_archive'
+basic_archive.archive_directory = '.'
+wal_level = replica

contrib/basic_archive/basic_archive.conf

@@ -0,0 +1,34 @@
+# Copyright (c) 2022-2023, PostgreSQL Global Development Group
+
+basic_archive_sources = files(
+  'basic_archive.c',
+)
+
+if host_system == 'windows'
+  basic_archive_sources += rc_lib_gen.process(win32ver_rc, extra_args: [
+    '--NAME', 'basic_archive',
+    '--FILEDESC', 'basic_archive - basic archive module',])
+endif
+
+basic_archive = shared_module('basic_archive',
+  basic_archive_sources,
+  kwargs: contrib_mod_args,
+)
+contrib_targets += basic_archive
+
+tests += {
+  'name': 'basic_archive',
+  'sd': meson.current_source_dir(),
+  'bd': meson.current_build_dir(),
+  'regress': {
+    'sql': [
+      'basic_archive',
+    ],
+    'regress_args': [
+      '--temp-config', files('basic_archive.conf'),
+    ],
+    # Disabled because these tests require "shared_preload_libraries=basic_archive",
+    # which typical runningcheck users do not have (e.g. buildfarm clients).
+    'runningcheck': false,
+  },
+}

contrib/basic_wal_module/expected/basic_wal_module.out renamed to contrib/basic_archive/expected/basic_archive.out

@@ -11,7 +11,7 @@ subdir('adminpack')
 subdir('amcheck')
 subdir('auth_delay')
 subdir('auto_explain')
-subdir('basic_wal_module')
+subdir('basic_archive')
 subdir('bloom')
 subdir('basebackup_to_shell')
 subdir('bool_plperl')

contrib/basic_archive/meson.build

@@ -38,6 +38,5 @@
  &obsolete-pgxlogdump;
  &obsolete-pgresetxlog;
  &obsolete-pgreceivexlog;
- &obsolete-basic-archive;
 
 </appendix>

contrib/basic_wal_module/sql/basic_wal_module.sql renamed to contrib/basic_archive/sql/basic_archive.sql

@@ -32,7 +32,7 @@
  </para>
 
  <para>
-  The <filename>contrib/basic_wal_module</filename> module contains a working
+  The <filename>contrib/basic_archive</filename> module contains a working
   example, which demonstrates some useful techniques.
  </para>
 

contrib/basic_wal_module/basic_wal_module.conf

@@ -1,16 +1,16 @@
-<!-- doc/src/sgml/basic-wal-module.sgml -->
+<!-- doc/src/sgml/basic-archive.sgml -->
 
-<sect1 id="basic-wal-module" xreflabel="basic_wal_module">
- <title>basic_wal_module &mdash; an example write-ahead log module</title>
+<sect1 id="basic-archive" xreflabel="basic_archive">
+ <title>basic_archive &mdash; an example WAL archive module</title>
 
- <indexterm zone="basic-wal-module">
-  <primary>basic_wal_module</primary>
+ <indexterm zone="basic-archive">
+  <primary>basic_archive</primary>
  </indexterm>
 
  <para>
-  <filename>basic_wal_module</filename> is an example of an archive module.
-  This module copies completed WAL segment files to the specified directory.
-  This may not be especially useful, but it can serve as a starting point for
+  <filename>basic_archive</filename> is an example of an archive module.  This
+  module copies completed WAL segment files to the specified directory.  This
+  may not be especially useful, but it can serve as a starting point for
   developing your own archive module.  For more information about archive
   modules, see <xref linkend="archive-modules"/>.
  </para>
@@ -21,15 +21,15 @@
   must be enabled.
  </para>
 
- <sect2 id="basic-wal-module-configuration-parameters">
+ <sect2 id="basic-archive-configuration-parameters">
   <title>Configuration Parameters</title>
 
   <variablelist>
    <varlistentry>
     <term>
-     <varname>basic_wal_module.archive_directory</varname> (<type>string</type>)
+     <varname>basic_archive.archive_directory</varname> (<type>string</type>)
      <indexterm>
-      <primary><varname>basic_wal_module.archive_directory</varname> configuration parameter</primary>
+      <primary><varname>basic_archive.archive_directory</varname> configuration parameter</primary>
      </indexterm>
     </term>
     <listitem>
@@ -52,12 +52,12 @@
 <programlisting>
 # postgresql.conf
 archive_mode = 'on'
-archive_library = 'basic_wal_module'
-basic_wal_module.archive_directory = '/path/to/archive/directory'
+archive_library = 'basic_archive'
+basic_archive.archive_directory = '/path/to/archive/directory'
 </programlisting>
  </sect2>
 
- <sect2 id="basic-wal-module-notes">
+ <sect2 id="basic-archive-notes">
   <title>Notes</title>
 
   <para>
@@ -70,7 +70,7 @@ basic_wal_module.archive_directory = '/path/to/archive/directory'
   </para>
  </sect2>
 
- <sect2 id="basic-wal-module-author">
+ <sect2 id="basic-archive-author">
   <title>Author</title>
 
   <para>

contrib/basic_wal_module/meson.build

@@ -105,7 +105,7 @@ CREATE EXTENSION <replaceable>extension_name</replaceable>;
  &auth-delay;
  &auto-explain;
  &basebackup-to-shell;
- &basic-wal-module;
+ &basic-archive;
  &bloom;
  &btree-gin;
  &btree-gist;

contrib/meson.build

@@ -116,7 +116,7 @@
 <!ENTITY amcheck         SYSTEM "amcheck.sgml">
 <!ENTITY auth-delay      SYSTEM "auth-delay.sgml">
 <!ENTITY auto-explain    SYSTEM "auto-explain.sgml">
-<!ENTITY basic-wal-module SYSTEM "basic-wal-module.sgml">
+<!ENTITY basic-archive   SYSTEM "basic-archive.sgml">
 <!ENTITY basebackup-to-shell SYSTEM "basebackup-to-shell.sgml">
 <!ENTITY bloom           SYSTEM "bloom.sgml">
 <!ENTITY btree-gin       SYSTEM "btree-gin.sgml">
@@ -200,4 +200,3 @@
 <!ENTITY obsolete-pgxlogdump SYSTEM "appendix-obsolete-pgxlogdump.sgml">
 <!ENTITY obsolete-pgresetxlog SYSTEM "appendix-obsolete-pgresetxlog.sgml">
 <!ENTITY obsolete-pgreceivexlog SYSTEM "appendix-obsolete-pgreceivexlog.sgml">
-<!ENTITY obsolete-basic-archive SYSTEM "appendix-obsolete-basic-archive.sgml">