qa/tasks/cephfs/mount: use 'ip r' instead 'route'

Some linux host may not have 'route' installed. So, maybe,
prefer 'ip r' to find out which default gateway is configured.

Addresses error if there is no net-tools installed on ubuntu
remote hosts:
  route: command not found

Signed-off-by: Kyr Shatskyy <[email protected]>

Author: Kyr Shatskyy

qa/tasks/cephfs/mount.py

@@ -296,12 +296,11 @@ def _setup_brx_and_nat(self):
         self.client_remote.run(args=args, timeout=(5*60), omit_sudo=False)
 
         # Setup the NAT
-        p = self.client_remote.run(args=['route'], stderr=StringIO(),
-                                   stdout=StringIO(), timeout=(5*60))
-        p = re.findall(r'default .*', p.stdout.getvalue())
-        if p == False:
+        routes = self.client_remote.sh('ip r', timeout=(5*60))
+        defaults = re.findall(r'^default .*', routes)
+        if defaults == False:
             raise RuntimeError("No default gw found")
-        gw = p[0].split()[7]
+        gw = defaults[0].split()[4]
 
         self.run_shell_payload(f"""
             set -e
@@ -441,12 +440,12 @@ def _cleanup_brx_and_nat(self):
         ip = IP(self.ceph_brx_net)[-2]
         mask = self.ceph_brx_net.split('/')[1]
 
-        p = self.client_remote.run(args=['route'], stderr=StringIO(),
-                                   stdout=StringIO(), timeout=(5*60))
-        p = re.findall(r'default .*', p.stdout.getvalue())
-        if p == False:
+        routes = self.client_remote.sh('ip r', timeout=(5*60))
+        defaults = re.findall(r'^default .*', routes)
+        if defaults == False:
             raise RuntimeError("No default gw found")
-        gw = p[0].split()[7]
+        gw = defaults[0].split()[4]
+
         self.run_shell_payload(f"""
             set -e
             sudo iptables -D FORWARD -o {gw} -i ceph-brx -j ACCEPT