Add local_command function to run commands locally

repmgr.c

@@ -130,6 +130,7 @@ static void exit_with_errors(void);
 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);
 
@@ -5970,6 +5971,37 @@ remote_command(const char *host, const char *user, const char *command, PQExpBuf
 }
 
 
+/*
+ * Execute a command locally.
+ */
+static bool
+local_command(const char *command, PQExpBufferData *outputbuf)
+{
+	FILE *fp;
+	char output[MAXLEN];
+
+	fp = popen(command, "r");
+
+	if (fp == NULL)
+	{
+		log_err(_("unable to execute local command:\n%s\n"), command);
+		return false;
+	}
+
+	/* TODO: better error handling */
+	while (fgets(output, MAXLEN, fp) != NULL)
+	{
+		appendPQExpBuffer(outputbuf, "%s", output);
+	}
+
+	pclose(fp);
+
+	log_verbose(LOG_DEBUG, "local_command(): output returned was:\n%s", outputbuf->data);
+
+	return true;
+}
+
+
 /*
  * Extract values from provided conninfo string and return
  * formatted as command-line parameters suitable for passing to repmgr