Add ALTER SYSTEM command to edit the server configuration file.

Patch contributed by Amit Kapila. Reviewed by Hari Babu, Masao Fujii,
Boszormenyi Zoltan, Andres Freund, Greg Smith and others.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/bin/initdb/initdb.c b/src/bin/initdb/initdb.c
index 30e3701f92a..e6bb132beaf 100644
--- a/src/bin/initdb/initdb.c
+++ b/src/bin/initdb/initdb.c
@@ -1228,6 +1228,7 @@ setup_config(void)
 	char		repltok[MAXPGPATH];
 	char		path[MAXPGPATH];
 	const char *default_timezone;
+	char	   *autoconflines[3];
 
 	fputs(_("creating configuration files ... "), stdout);
 	fflush(stdout);
@@ -1320,6 +1321,21 @@ setup_config(void)
 	writefile(path, conflines);
 	chmod(path, S_IRUSR | S_IWUSR);
 
+	/*
+	 * create the automatic configuration file to store the configuration
+	 * parameters set by ALTER SYSTEM command. The parameters present in this
+	 * file will override the value of parameters that exists before parse of
+	 * this file.
+	 */
+	autoconflines[0] = pg_strdup("# Do not edit this file manually! \n");
+	autoconflines[1] = pg_strdup("# It will be overwritten by the ALTER SYSTEM command. \n");
+	autoconflines[2] = NULL;
+
+	sprintf(path, "%s/%s", pg_data, PG_AUTOCONF_FILENAME);
+
+	writefile(path, autoconflines);
+	chmod(path, S_IRUSR | S_IWUSR);
+
 	free(conflines);