Use XAPI to edit DNS entries within xsconsole

Instead of directly editing `/etc/resolv.conf`, use XAPI to edit it.
This fixes an issue where the changes weren't retained after a reboot because XAPI
would override the changes with what was stored in its DB. Using XAPI to edit the DNS entries
also applies the changes in XAPI's DB and so changes are kept after reboots.

Signed-off-by: BenjiReis <benjamin.reis@vates.fr>

Author: benjamreis

XSConsoleData.py

@@ -524,18 +524,16 @@ def SaveToResolveConf(self):
         # Double-check authentication
         Auth.Inst().AssertAuthenticated()
 
-        file = None
-        try:
-            file = open("/etc/resolv.conf", "w")
-            now = datetime.datetime.now().strftime("; created by xsconsole %I:%M%p on %B %d, %Y\n")
-            file.write(now)
-            for other in self.dns.othercontents([]):
-                file.write(other+"\n")
-            for server in self.dns.nameservers([]):
-                file.write("nameserver "+server+"\n")
-        finally:
-            if file is not None: file.close()
-            self.UpdateFromResolveConf()
+        for pif in Data.Inst().derived.managementpifs([]):
+            ipv6 = pif['primary_address_type'].lower() == 'ipv6'
+            mode = pif['ipv6_configuration_mode'] if ipv6 else pif['ip_configuration_mode']
+            ip = pif['IPv6'][0].split('/')[0] if ipv6 else pif['IP']
+            netmask = pif['IPv6'][0].split('/')[1] if ipv6 else pif['netmask']
+            gw = pif['ipv6_gateway'] if ipv6 else pif['gateway']
+            dns = ','.join(self.dns.nameservers([]))
+            self.ReconfigureManagement(pif, mode, ip, netmask, gw, dns)
+
+        self.UpdateFromResolveConf()
 
 
     def ScanDmiDecode(self, inLines):