lib: add minimal no-config VTY mode

This silences the following warning from watchquagga:
"Can't save to configuration file, using vtysh."
which otherwise appears when doing a "write file" in vtysh when no
integrated-config is in use.

Also make "show memory" available in watchquagga.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

3 files changed, 27 insertions, 8 deletions

diff --git a/lib/command.c b/lib/command.c
index 56c262a64..e8ba63762 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -3146,6 +3146,9 @@ DEFUN (config_write_file,
   struct vty *file_vty;
   struct stat conf_stat;
 
+  if (host.noconfig)
+    return CMD_SUCCESS;
+
   /* Check and see if we are operating under vtysh configuration */
   if (host.config == NULL)
     {
@@ -3270,6 +3273,9 @@ DEFUN (config_write_terminal,
   unsigned int i;
   struct cmd_node *node;
 
+  if (host.noconfig)
+    return CMD_SUCCESS;
+
   if (vty->type == VTY_SHELL_SERV)
     {
       for (i = 0; i < vector_active (cmdvec); i++)
@@ -3313,6 +3319,11 @@ DEFUN (show_startup_config,
   char buf[BUFSIZ];
   FILE *confp;
 
+  if (host.noconfig)
+    return CMD_SUCCESS;
+  if (host.config == NULL)
+    return CMD_WARNING;
+
   confp = fopen (host.config, "r");
   if (confp == NULL)
     {
@@ -4203,7 +4214,11 @@ install_default (enum node_type node)
   install_element (node, &show_running_config_cmd);
 }
 
-/* Initialize command interface. Install basic nodes and commands. */
+/* Initialize command interface. Install basic nodes and commands.
+ *
+ * terminal = 0 -- vtysh / no logging, no config control
+ * terminal = 1 -- normal daemon
+ * terminal = -1 -- watchquagga / no logging, but minimal config control */
 void
 cmd_init (int terminal)
 {
@@ -4224,6 +4239,7 @@ cmd_init (int terminal)
   host.enable = NULL;
   host.logfile = NULL;
   host.config = NULL;
+  host.noconfig = (terminal < 0);
   host.lines = -1;
   host.motd = default_motd;
   host.motdfile = NULL;
@@ -4269,12 +4285,17 @@ cmd_init (int terminal)
     {
       install_element (ENABLE_NODE, &config_logmsg_cmd);
       install_default (CONFIG_NODE);
+
+      install_element (VIEW_NODE, &show_thread_cpu_cmd);
+      install_element (ENABLE_NODE, &clear_thread_cpu_cmd);
+
+      install_element (VIEW_NODE, &show_work_queues_cmd);
     }
   
   install_element (CONFIG_NODE, &hostname_cmd);
   install_element (CONFIG_NODE, &no_hostname_cmd);
 
-  if (terminal)
+  if (terminal > 0)
     {
       install_element (CONFIG_NODE, &password_cmd);
       install_element (CONFIG_NODE, &password_text_cmd);
@@ -4313,11 +4334,6 @@ cmd_init (int terminal)
       install_element (CONFIG_NODE, &service_terminal_length_cmd);
       install_element (CONFIG_NODE, &no_service_terminal_length_cmd);
 
-      install_element (VIEW_NODE, &show_thread_cpu_cmd);
-      
-      install_element (ENABLE_NODE, &clear_thread_cpu_cmd);
-      install_element (VIEW_NODE, &show_work_queues_cmd);
-
       vrf_install_commands ();
     }
   srandom(time(NULL));
diff --git a/lib/command.h b/lib/command.h
index ba40770ba..d2fc969d7 100644
--- a/lib/command.h
+++ b/lib/command.h
@@ -56,6 +56,7 @@ struct host
 
   /* config file name of this host */
   char *config;
+  int noconfig;
 
   /* Flags for services */
   int advanced;
diff --git a/watchquagga/watchquagga.c b/watchquagga/watchquagga.c
index 70b35f775..93bbb0429 100644
--- a/watchquagga/watchquagga.c
+++ b/watchquagga/watchquagga.c
@@ -25,6 +25,7 @@
 #include <sigevent.h>
 #include <lib/version.h>
 #include "command.h"
+#include "memory_vty.h"
 
 #include <getopt.h>
 #include <sys/un.h>
@@ -1304,7 +1305,8 @@ main(int argc, char **argv)
   zprivs_init (&watchquagga_privs);
 
   master = thread_master_create();
-  cmd_init(1);
+  cmd_init(-1);
+  memory_init();
   vty_init(master);
   watchquagga_vty_init();
   vty_serv_sock(NULL, 0, WATCHQUAGGA_VTYSH_PATH);