initdb: Remove obsolete locale handling

The method of passing LC_COLLATE and LC_CTYPE to the backend during
initdb is obsolete as of 61d96749.
This can all be removed.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/eeaf2f99-a1a6-8aca-3f43-9ab0b2fb112a%402ndquadrant.com

src/backend/main/main.c

@@ -99,42 +99,24 @@ main(int argc, char *argv[])
 	MemoryContextInit();
 
 	/*
-	 * Set up locale information from environment.  Note that LC_CTYPE and
-	 * LC_COLLATE will be overridden later from pg_control if we are in an
-	 * already-initialized database.  We set them here so that they will be
-	 * available to fill pg_control during initdb.  LC_MESSAGES will get set
-	 * later during GUC option processing, but we set it here to allow startup
-	 * error messages to be localized.
+	 * Set up locale information
 	 */
-
 	set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("postgres"));
 
-#ifdef WIN32
-
 	/*
-	 * Windows uses codepages rather than the environment, so we work around
-	 * that by querying the environment explicitly first for LC_COLLATE and
-	 * LC_CTYPE. We have to do this because initdb passes those values in the
-	 * environment. If there is nothing there we fall back on the codepage.
+	 * In the postmaster, absorb the environment values for LC_COLLATE and
+	 * LC_CTYPE.  Individual backends will change these later to settings
+	 * taken from pg_database, but the postmaster cannot do that.  If we leave
+	 * these set to "C" then message localization might not work well in the
+	 * postmaster.
 	 */
-	{
-		char	   *env_locale;
-
-		if ((env_locale = getenv("LC_COLLATE")) != NULL)
-			init_locale("LC_COLLATE", LC_COLLATE, env_locale);
-		else
-			init_locale("LC_COLLATE", LC_COLLATE, "");
-
-		if ((env_locale = getenv("LC_CTYPE")) != NULL)
-			init_locale("LC_CTYPE", LC_CTYPE, env_locale);
-		else
-			init_locale("LC_CTYPE", LC_CTYPE, "");
-	}
-#else
 	init_locale("LC_COLLATE", LC_COLLATE, "");
 	init_locale("LC_CTYPE", LC_CTYPE, "");
-#endif
 
+	/*
+	 * LC_MESSAGES will get set later during GUC option processing, but we set
+	 * it here to allow startup error messages to be localized.
+	 */
 #ifdef LC_MESSAGES
 	init_locale("LC_MESSAGES", LC_MESSAGES, "");
 #endif

src/bin/initdb/initdb.c

@@ -1417,20 +1417,6 @@ bootstrap_template1(void)
 	bki_lines = replace_token(bki_lines, "LC_CTYPE",
 							  escape_quotes_bki(lc_ctype));
 
-	/*
-	 * Pass correct LC_xxx environment to bootstrap.
-	 *
-	 * The shell script arranged to restore the LC settings afterwards, but
-	 * there doesn't seem to be any compelling reason to do that.
-	 */
-	snprintf(cmd, sizeof(cmd), "LC_COLLATE=%s", lc_collate);
-	putenv(pg_strdup(cmd));
-
-	snprintf(cmd, sizeof(cmd), "LC_CTYPE=%s", lc_ctype);
-	putenv(pg_strdup(cmd));
-
-	unsetenv("LC_ALL");
-
 	/* Also ensure backend isn't confused by this environment var: */
 	unsetenv("PGCLIENTENCODING");