Add repmgr.conf setting 'barman_config'

Enables provision of a non-default Barman configuration file.

README.md

@@ -571,7 +571,7 @@ development team, which must be copied in a location accessible to
 `repmgr`, and marked as executable; `restore_command` must then be
 set in `repmgr.conf` as follows:
 
-    <script> <Barman hostname> <cluster_name> %f %p 
+    <script> <Barman hostname> <cluster_name> %f %p
 
 For instance, suppose that we have installed Barman on the `barmansrv`
 host, and that we have placed a copy of `barman-wal-restore.py` into
@@ -585,6 +585,11 @@ Then we check that `repmgr.conf` includes the following lines:
 	barman_server=barmansrv
 	restore_command=/usr/local/bin/barman-wal-restore.py barmansrv test %f %p
 
+To use a non-default Barman configuration file on the Barman server,
+specify this in `repmgr.conf` with `barman_config`:
+
+    barman_config=/path/to/barman.conf
+
 Now we can clone a standby using the Barman server:
 
     $ repmgr -h node1 -D 9.5/main -f /etc/repmgr.conf standby clone
@@ -595,6 +600,8 @@ Now we can clone a standby using the Barman server:
     [2016-06-12 20:08:36] [HINT] for example : pg_ctl -D 9.5/data start
     [2016-06-12 20:08:36] [HINT] After starting the server, you need to register this standby with "repmgr standby register"
 
+
+
 Advanced options for cloning a standby
 --------------------------------------
 

config.c

@@ -216,6 +216,7 @@ parse_config(t_configuration_options *options)
 	options->use_replication_slots = 0;
 	memset(options->conninfo, 0, sizeof(options->conninfo));
 	memset(options->barman_server, 0, sizeof(options->barman_server));
+	memset(options->barman_config, 0, sizeof(options->barman_config));
 	options->failover = MANUAL_FAILOVER;
 	options->priority = DEFAULT_PRIORITY;
 	memset(options->node_name, 0, sizeof(options->node_name));
@@ -313,6 +314,8 @@ parse_config(t_configuration_options *options)
 			strncpy(options->conninfo, value, MAXLEN);
 		else if (strcmp(name, "barman_server") == 0)
 			strncpy(options->barman_server, value, MAXLEN);
+		else if (strcmp(name, "barman_config") == 0)
+			strncpy(options->barman_config, value, MAXLEN);
 		else if (strcmp(name, "rsync_options") == 0)
 			strncpy(options->rsync_options, value, QUERY_STR_LEN);
 		else if (strcmp(name, "ssh_options") == 0)

config.h

@@ -59,6 +59,7 @@ typedef struct
 	int         upstream_node;
 	char		conninfo[MAXLEN];
 	char		barman_server[MAXLEN];
+	char		barman_config[MAXLEN];
 	int			failover;
 	int			priority;
 	char		node_name[MAXLEN];
@@ -92,7 +93,7 @@ typedef struct
  * The following will initialize the structure with a minimal set of options;
  * actual defaults are set in parse_config() before parsing the configuration file
  */
-#define T_CONFIGURATION_OPTIONS_INITIALIZER { "", -1, NO_UPSTREAM_NODE, "", "", MANUAL_FAILOVER, -1, "", "", "", "", "", "", "", "", "", "", -1, -1, -1, "", "", "", "", "", 0, 0, 0, 0, "", { NULL, NULL }, {NULL, NULL} }
+#define T_CONFIGURATION_OPTIONS_INITIALIZER { "", -1, NO_UPSTREAM_NODE, "", "", "", MANUAL_FAILOVER, -1, "", "", "", "", "", "", "", "", "", "", -1, -1, -1, "", "", "", "", "", 0, 0, 0, 0, "", { NULL, NULL }, {NULL, NULL} }
 
 typedef struct ItemListCell
 {

repmgr.c

@@ -111,6 +111,7 @@ static char *string_skip_prefix(const char *prefix, char *string);
 static char *string_remove_trailing_newlines(char *string);
 
 static char *make_pg_path(char *file);
+static char *make_barman_ssh_command(void);
 
 static void do_master_register(void);
 
@@ -137,6 +138,7 @@ static void print_error_list(ItemList *error_list, int log_level);
 
 static bool remote_command(const char *host, const char *user, const char *command, PQExpBufferData *outputbuf);
 static bool local_command(const char *command, PQExpBufferData *outputbuf);
+
 static void format_db_cli_params(const char *conninfo, char *output);
 static bool copy_file(const char *old_filename, const char *new_filename);
 
@@ -172,6 +174,7 @@ static char  pg_bindir[MAXLEN] = "";
 static char  repmgr_slot_name[MAXLEN] = "";
 static char *repmgr_slot_name_ptr = NULL;
 static char  path_buf[MAXLEN] = "";
+static char  barman_command_buf[MAXLEN] = "";
 
 /* Collate command line errors and warnings here for friendlier reporting */
 ItemList	cli_errors = { NULL, NULL };
@@ -2054,8 +2057,8 @@ do_standby_clone(void)
 			 * Check that there is at least one valid backup
 			 */
 
-			maxlen_snprintf(command, "ssh %s barman show-backup %s latest > /dev/null",
-							options.barman_server,
+			maxlen_snprintf(command, "%s show-backup %s latest > /dev/null",
+							make_barman_ssh_command(),
 							options.cluster_name);
 			command_ok = local_command(command, NULL);
 			if (command_ok == false)
@@ -2070,8 +2073,8 @@ do_standby_clone(void)
 			 * Locate Barman's backup directory
 			 */
 
-			maxlen_snprintf(command, "ssh %s barman show-server %s | grep 'backup_directory'",
-							options.barman_server,
+			maxlen_snprintf(command, "%s show-server %s | grep 'backup_directory'",
+							make_barman_ssh_command(),
 							options.cluster_name);
 
 			initPQExpBuffer(&command_output);
@@ -2126,8 +2129,8 @@ do_standby_clone(void)
 				char output[MAXLEN];
 				int n;
 
-				maxlen_snprintf(command, "ssh %s barman list-files --target=data %s latest",
-								options.barman_server,
+				maxlen_snprintf(command, "%s list-files --target=data %s latest",
+								make_barman_ssh_command(),
 								options.cluster_name);
 
 				fi = popen(command, "r");
@@ -6437,6 +6440,26 @@ make_pg_path(char *file)
 }
 
 
+static char *
+make_barman_ssh_command(void)
+{
+	static char config_opt[MAXLEN] = "";
+
+	if(strlen(options.barman_config))
+		maxlen_snprintf(config_opt,
+						" --config=%s",
+						options.barman_config);
+
+	maxlen_snprintf(barman_command_buf,
+					"ssh %s barman%s",
+					options.barman_server,
+					config_opt);
+
+	return barman_command_buf;
+}
+
+
+
 static void
 exit_with_errors(void)
 {