EOS syntax change updates

Arista has released FN 0039 (available to Arista customers with support
contract) detailing changes to command syntax that impacts several show
commands used by NAPALM beginning in EOS Release 4.23.0. NAPALM will
re-try specific show commands if a CommandError is raised with the newer
syntax.

napalm/eos/eos.py

@@ -579,14 +579,22 @@ def extract_temperature_data(data):
                 }
                 yield name, values
 
-        sh_version_out = self.device.run_commands(["show version"])
-        is_veos = sh_version_out[0]["modelName"].lower() == "veos"
-        commands = ["show environment cooling", "show environment temperature"]
+        commands = [
+            "show version",
+            "show environment cooling",
+            "show environment temperature",
+        ]
+        try:
+            version, fans_output, temp_output = self.device.run_commands(commands)
+        except pyeapi.eapilib.CommandError:
+            # FN 0039
+            commands[1] = "show system environment cooling"
+            version, fans_output, temp_output = self.device.run_commands(commands)
+
+        is_veos = version["modelName"].lower() == "veos"
         if not is_veos:
-            commands.append("show environment power")
-            fans_output, temp_output, power_output = self.device.run_commands(commands)
-        else:
-            fans_output, temp_output = self.device.run_commands(commands)
+            power_output = self.device.run_commands(["show environment power"])[0]
+
         environment_counters = {"fans": {}, "temperature": {}, "power": {}, "cpu": {}}
         cpu_output = self.device.run_commands(
             ["show processes top once"], encoding="text"
@@ -1326,7 +1334,12 @@ def get_snmp_information(self):
         snmp_dict = {"chassis_id": "", "location": "", "contact": "", "community": {}}
 
         commands = ["show snmp chassis", "show snmp location", "show snmp contact"]
-        snmp_config = self.device.run_commands(commands, encoding="json")
+        try:
+            snmp_config = self.device.run_commands(commands, encoding="json")
+        except pyeapi.eapilib.CommandError:
+            # FN 0039
+            commands = ["show snmp v2-mib chassis", "show snmp v2-mib location", "show snmp v2-mib contact"]
+            snmp_config = self.device.run_commands(commands, encoding="json")
         for line in snmp_config:
             for k, v in line.items():
                 if k == "chassisId":
@@ -1361,7 +1374,12 @@ def _sshkey_type(sshkey):
         users = {}
 
         commands = ["show user-account"]
-        user_items = self.device.run_commands(commands)[0].get("users", {})
+        try:
+            user_items = self.device.run_commands(commands)[0].get("users", {})
+        except pyeapi.eapilib.CommandError:
+            # FN 0039
+            commands = ["show users accounts"]
+            user_items = self.device.run_commands(commands)[0].get("users", {})
 
         for user, user_details in user_items.items():
             user_details.pop("username", "")
@@ -1452,12 +1470,12 @@ def traceroute(
             traceroute_raw_output = self.device.run_commands(commands, encoding="text")[
                 -1
             ].get("output")
-        except CommandErrorException:
-            return {
-                "error": "Cannot execute traceroute on the device: {}".format(
-                    commands[0]
-                )
-            }
+        except pyeapi.eapilib.CommandError:
+            # FN 0039
+            commands[0] = "cli vrf {vrf}".format(vrf=vrf)
+            traceroute_raw_output = self.device.run_commands(commands, encoding="text")[
+                -1
+            ].get("output")
 
         hop_regex = "".join(_HOP_ENTRY + _HOP_ENTRY_PROBE * probes)
 
@@ -1619,7 +1637,15 @@ def _append(bgp_dict, peer_info):
                 commands.append("show ipv6 bgp neighbors %s vrf all" % neighbor_address)
                 summary_commands.append("show ipv6 bgp summary vrf all")
 
-        raw_output = self.device.run_commands(commands, encoding="text")
+        try:
+            raw_output = self.device.run_commands(commands, encoding="text")
+        except pyeapi.eapilib.CommandError:
+            # FN 0039
+            if not neighbor_address:
+                commands[1] = "show ipv6 bgp peers vrf all"
+            else:
+                commands[0] = "show ipv6 bgp peers %s vrf all" % neighbor_address
+            raw_output = self.device.run_commands(commands, encoding="text")
         bgp_summary = self.device.run_commands(summary_commands, encoding="json")
 
         bgp_detail_info = {}
@@ -1874,7 +1900,12 @@ def ping(
             command += " source {}".format(source)
 
         commands.append(command)
-        output = self.device.run_commands(commands, encoding="text")[-1]["output"]
+        try:
+            output = self.device.run_commands(commands, encoding="text")[-1]["output"]
+        except pyeapi.eapilib.CommandError:
+            # FN 0039
+            commands[0] = "cli vrf {vrf}".format(vrf=vrf)
+            output = self.device.run_commands(commands, encoding="text")[-1]["output"]
 
         if "connect:" in output:
             ping_dict["error"] = output