system: T5505: T5575: support calling system-ip(v6).py from init process

After commit 976f82785 ("T5575: ARP/NDP table-size isnt set properly") the
system bootup process got interrupted as both system-ip.py and system-ipv6.py
tried to talk to FRR which was yet not started.

This has been fixed by using a conditional path to only execute when FRR service
has been enabled. This is safe to do as the initial commit call will has FRR
service running and the path will be executed.

(cherry picked from commit 22d5cd42f082fb11060edc51128f0b246198d2c1)

1 files changed, 15 insertions, 10 deletions

diff --git a/src/conf_mode/system-ipv6.py b/src/conf_mode/system-ipv6.py
index e40ed38e2..90a1a8087 100755
--- a/src/conf_mode/system-ipv6.py
+++ b/src/conf_mode/system-ipv6.py
@@ -22,8 +22,9 @@ from vyos.configdict import dict_merge
 from vyos.configverify import verify_route_map
 from vyos.template import render_to_string
 from vyos.utils.dict import dict_search
-from vyos.utils.system import sysctl_write
 from vyos.utils.file import write_file
+from vyos.utils.process import is_systemd_service_active
+from vyos.utils.system import sysctl_write
 from vyos import ConfigError
 from vyos import frr
 from vyos import airbag
@@ -93,16 +94,20 @@ def apply(opt):
             if name == 'accept_dad':
                 write_file(os.path.join(root, name), value)
 
-    zebra_daemon = 'zebra'
-    # Save original configuration prior to starting any commit actions
-    frr_cfg = frr.FRRConfig()
+    # During startup of vyos-router that brings up FRR, the service is not yet
+    # running when this script is called first. Skip this part and wait for initial
+    # commit of the configuration to trigger this statement
+    if is_systemd_service_active('frr.service'):
+        zebra_daemon = 'zebra'
+        # Save original configuration prior to starting any commit actions
+        frr_cfg = frr.FRRConfig()
 
-    # The route-map used for the FIB (zebra) is part of the zebra daemon
-    frr_cfg.load_configuration(zebra_daemon)
-    frr_cfg.modify_section(r'ipv6 protocol \w+ route-map [-a-zA-Z0-9.]+', stop_pattern='(\s|!)')
-    if 'frr_zebra_config' in opt:
-        frr_cfg.add_before(frr.default_add_before, opt['frr_zebra_config'])
-    frr_cfg.commit_configuration(zebra_daemon)
+        # The route-map used for the FIB (zebra) is part of the zebra daemon
+        frr_cfg.load_configuration(zebra_daemon)
+        frr_cfg.modify_section(r'ipv6 protocol \w+ route-map [-a-zA-Z0-9.]+', stop_pattern='(\s|!)')
+        if 'frr_zebra_config' in opt:
+            frr_cfg.add_before(frr.default_add_before, opt['frr_zebra_config'])
+        frr_cfg.commit_configuration(zebra_daemon)
 
 if __name__ == '__main__':
     try: