frr: T5239: fix process startup order

- Reuse existing utility functions to check if a boot is ongoing
  (boot_configuration_complete())
- Run system_frr.py script to configure FRR daemon before initial launch
- Add safety net to always have FRR running on the system

This does yet not solve the error in T5239 but it's a small step towards
the solution.

(cherry picked from commit df74a09b80df0c2ec769a10ef4f7bac01f50eb2d)

2 files changed, 15 insertions, 21 deletions

diff --git a/src/conf_mode/system_frr.py b/src/conf_mode/system_frr.py
index fb252238a..d8224b3c3 100755
--- a/src/conf_mode/system_frr.py
+++ b/src/conf_mode/system_frr.py
@@ -22,17 +22,14 @@ from vyos import airbag
 from vyos.config import Config
 from vyos.logger import syslog
 from vyos.template import render_to_string
+from vyos.utils.boot import boot_configuration_complete
 from vyos.utils.file import read_file
 from vyos.utils.file import write_file
-from vyos.utils.process import run
+from vyos.utils.process import call
 airbag.enable()
 
 # path to daemons config and config status files
 config_file = '/etc/frr/daemons'
-vyos_status_file = '/tmp/vyos-config-status'
-# path to watchfrr for FRR control
-watchfrr = '/usr/lib/frr/watchfrr.sh'
-
 
 def get_config(config=None):
     if config:
@@ -45,12 +42,10 @@ def get_config(config=None):
 
     return frr_config
 
-
 def verify(frr_config):
     # Nothing to verify here
     pass
 
-
 def generate(frr_config):
     # read daemons config file
     daemons_config_current = read_file(config_file)
@@ -62,25 +57,21 @@ def generate(frr_config):
         write_file(config_file, daemons_config_new)
         frr_config['config_file_changed'] = True
 
-
 def apply(frr_config):
-    # check if this is initial commit during boot or intiated by CLI
-    # if the file exists, this must be CLI commit
-    commit_type_cli = Path(vyos_status_file).exists()
     # display warning to user
-    if commit_type_cli and frr_config.get('config_file_changed'):
+    if boot_configuration_complete() and frr_config.get('config_file_changed'):
         # Since FRR restart is not safe thing, better to give
         # control over this to users
         print('''
         You need to reboot a router (preferred) or restart FRR
         to apply changes in modules settings
         ''')
-    # restart FRR automatically. DUring the initial boot this should be
-    # safe in most cases
-    if not commit_type_cli and frr_config.get('config_file_changed'):
-        syslog.warning('Restarting FRR to apply changes in modules')
-        run(f'{watchfrr} restart')
 
+    # restart FRR automatically
+    # During initial boot this should be safe in most cases
+    if not boot_configuration_complete() and frr_config.get('config_file_changed'):
+        syslog.warning('Restarting FRR to apply changes in modules')
+        call(f'systemctl restart frr.service')
 
 if __name__ == '__main__':
     try:
diff --git a/src/init/vyos-router b/src/init/vyos-router
index 96f163213..8572f53fc 100755
--- a/src/init/vyos-router
+++ b/src/init/vyos-router
@@ -337,10 +337,6 @@ start ()
     nfct helper add tns inet tcp
     nft -f /usr/share/vyos/vyos-firewall-init.conf || log_failure_msg "could not initiate firewall rules"
 
-    rm -f /etc/hostname
-    ${vyos_conf_scripts_dir}/host_name.py || log_failure_msg "could not reset host-name"
-    systemctl start frr.service
-
     # As VyOS does not execute commands that are not present in the CLI we call
     # the script by hand to have a single source for the login banner and MOTD
     ${vyos_conf_scripts_dir}/system_console.py || log_failure_msg "could not reset serial console"
@@ -373,6 +369,13 @@ start ()
       && chgrp ${GROUP} ${vyatta_configdir}
     log_action_end_msg $?
 
+    rm -f /etc/hostname
+    ${vyos_conf_scripts_dir}/host_name.py || log_failure_msg "could not reset host-name"
+    ${vyos_conf_scripts_dir}/system_frr.py || log_failure_msg "could not reset FRR config"
+    # If for any reason FRR was not started by system_frr.py - start it anyways.
+    # This is a safety net!
+    systemctl start frr.service
+
     disabled bootfile || init_bootfile
 
     cleanup_post_commit_hooks