switchover: check for pending archive files on the demotion candidate

If the current primary (demotion candidate) still has any files to archive,
it will delay the shutdown until all files are archived. If there is a
substantial number of files, and/or the archive command executes slowly,
this will probably lead to an unwelcome delay in the switchover process.

repmgr-client-global.h

@@ -15,6 +15,13 @@
 /* default value for "cluster event --limit"*/
 #define CLUSTER_EVENT_LIMIT 20
 
+typedef enum {
+	OM_TEXT,
+	OM_CSV,
+	OM_NAGIOS,
+	OM_OPTFORMAT
+} OutputMode;
+
 typedef struct
 {
 	/* configuration metadata */
@@ -39,6 +46,8 @@ typedef struct
 
 	/* output options */
 	bool		csv;
+	bool		nagios;
+	bool		optformat;
 
 	/* standard connection options */
 	char		dbname[MAXLEN];
@@ -81,6 +90,9 @@ typedef struct
 	/* "node status" options */
 	bool		is_shutdown;
 
+	/* "node check" options */
+	bool		archiver;
+
 	/* "node service" options */
 	char		action[MAXLEN];
 	bool		check;
@@ -94,6 +106,7 @@ typedef struct
 
 	/* following options for internal use */
 	char		config_archive_dir[MAXPGPATH];
+	OutputMode	output_mode;
 }	t_runtime_options;
 
 #define T_RUNTIME_OPTIONS_INITIALIZER { \
@@ -104,7 +117,7 @@ typedef struct
 		/* logging options */ \
 		"", false, false, false, \
 		/* output options */ \
-		false, \
+		false, false, false,  \
 		/* database connection options */ \
 		"", "", "",	"",				  \
 		/* other connection options */ \
@@ -120,11 +133,14 @@ typedef struct
 		"", false, false,  \
 		/* "node status" options */ \
 		false, \
+		/* "node check" options */ \
+		false, \
 		/* "node service" options */ \
 		"", false, false, false,  \
 		/* "cluster event" options */ \
 		false, "", CLUSTER_EVENT_LIMIT,	\
-		"/tmp" \
+		/* Following options for internal use */ \
+		"/tmp", OM_TEXT	\
 }
 
 
@@ -144,6 +160,13 @@ typedef enum {
 } t_server_action;
 
 
+typedef enum {
+	CHECK_STATUS_OK = 0,
+	CHECK_STATUS_WARNING,
+	CHECK_STATUS_CRITICAL,
+	CHECK_STATUS_UNKNOWN
+} CheckStatus;
+
 
 /* global configuration structures */
 extern t_runtime_options runtime_options;