virtualization/azure: fixes

azure-agent: add option for verbose logging
azure-agent: disable ssh host key regeneration
azure-common: set verbose logging on
azure-image: increase size to 30GB

nixos/modules/virtualisation/azure-agent.nix

@@ -54,9 +54,15 @@ in
 
   ###### interface
 
-  options.virtualisation.azure.agent.enable = mkOption {
-    default = false;
-    description = "Whether to enable the Windows Azure Linux Agent.";
+  options.virtualisation.azure.agent = {
+    enable = mkOption {
+      default = false;
+      description = "Whether to enable the Windows Azure Linux Agent.";
+    };
+    verboseLogging = mkOption {
+      default = false;
+      description = "Whether to enable verbose logging.";
+    };
   };
 
   ###### implementation
@@ -88,7 +94,7 @@ in
         Provisioning.DeleteRootPassword=n
 
         # Generate fresh host key pair.
-        Provisioning.RegenerateSshHostKeyPair=y
+        Provisioning.RegenerateSshHostKeyPair=n
 
         # Supported values are "rsa", "dsa" and "ecdsa".
         Provisioning.SshHostKeyPairType=ed25519
@@ -121,7 +127,7 @@ in
         Logs.Console=y
 
         # Enable verbose logging (y|n)
-        Logs.Verbose=n
+        Logs.Verbose=${if cfg.verboseLogging then "y" else "n"}
 
         # Root device timeout in seconds.
         OS.RootDeviceScsiTimeout=300

nixos/modules/virtualisation/azure-common.nix

@@ -6,6 +6,7 @@ with lib;
 
   require = [ ./azure-agent.nix ];
   virtualisation.azure.agent.enable = true;
+  virtualisation.azure.agent.verboseLogging = true;
 
   boot.kernelParams = [ "console=ttyS0" "earlyprintk=ttyS0" "rootdelay=300" "panic=1" "boot.panic_on_fail" ];
   boot.initrd.kernelModules = [ "hv_vmbus" "hv_netvsc" "hv_utils" "hv_storvsc" ];

nixos/modules/virtualisation/azure-image.nix

@@ -2,7 +2,7 @@
 
 with lib;
 let
-  diskSize = "4096";
+  diskSize = "30720";
 in
 {
   system.build.azureImage =