CP-308545 Add host.timezone

New filed: host.timezone
APIs: host.set_timezone, host.get_timezone, host.list_timezones

Signed-off-by: Changlei Li <changlei.li@cloud.com>

Author: changlei-li

ocaml/idl/datamodel_host.ml

@@ -2627,6 +2627,22 @@ let get_ntp_servers_status =
       )
     ~allowed_roles:_R_READ_ONLY ()
 
+let set_timezone =
+  call ~name:"set_timezone" ~lifecycle:[] ~doc:"Set the host's timezone."
+    ~params:
+      [
+        (Ref _host, "self", "The host")
+      ; (String, "value", "The timezone to set, e.g., 'Europe/London'")
+      ]
+    ~allowed_roles:_R_POOL_OP ()
+
+let list_timezones =
+  call ~name:"list_timezones" ~lifecycle:[]
+    ~doc:"List all available timezones on the host."
+    ~params:[(Ref _host, "self", "The host")]
+    ~result:(Set String, "The set of available timezones on the host")
+    ~allowed_roles:_R_READ_ONLY ()
+
 (** Hosts *)
 let t =
   create_obj ~in_db:true
@@ -2779,6 +2795,8 @@ let t =
       ; disable_ntp
       ; enable_ntp
       ; get_ntp_servers_status
+      ; set_timezone
+      ; list_timezones
       ]
     ~contents:
       ([
@@ -3256,6 +3274,9 @@ let t =
         ; field ~qualifier:DynamicRO ~lifecycle:[] ~ty:Bool
             ~default_value:(Some (VBool false)) "ntp_enabled"
             "Reflects whether NTP is enabled on the host"
+        ; field ~qualifier:DynamicRO ~lifecycle:[] ~ty:String
+            ~default_value:(Some (VString "UTC")) "timezone"
+            "The timezone of the host in IANA format"
         ]
       )
     ()

ocaml/tests/common/test_common.ml

@@ -225,7 +225,7 @@ let make_host2 ~__context ?(ref = Ref.make ()) ?(uuid = make_uuid ())
     ~last_update_hash:"" ~ssh_enabled:true ~ssh_enabled_timeout:0L
     ~ssh_expiry:Date.epoch ~console_idle_timeout:0L ~ssh_auto_mode:false
     ~max_cstate:"" ~secure_boot:false ~ntp_mode:`ntp_mode_dhcp
-    ~ntp_custom_servers:[] ~ntp_enabled:false ;
+    ~ntp_custom_servers:[] ~ntp_enabled:false ~timezone:"UTC" ;
   ref
 
 let make_pif ~__context ~network ~host ?(device = "eth0")

ocaml/xapi-cli-server/records.ml

@@ -3426,6 +3426,12 @@ let host_record rpc session_id host =
       ; make_field ~name:"ntp_enabled"
           ~get:(fun () -> string_of_bool (x ()).API.host_ntp_enabled)
           ()
+      ; make_field ~name:"timezone"
+          ~get:(fun () -> (x ()).API.host_timezone)
+          ~set:(fun value ->
+            Client.Host.set_timezone ~rpc ~session_id ~self:host ~value
+          )
+          ()
       ]
   }
 

ocaml/xapi/dbsync_slave.ml

@@ -418,6 +418,18 @@ let update_env __context sync_keys =
   switched_sync Xapi_globs.sync_ntp_config (fun () ->
       Xapi_host.sync_ntp_config ~__context ~host:localhost
   ) ;
+  switched_sync Xapi_globs.sync_timezone (fun () ->
+      let timezone =
+        try
+          let linkpath = Unix.realpath "/etc/localtime" in
+          Scanf.sscanf linkpath "/usr/share/zoneinfo/%s" (fun tz -> tz)
+        with e ->
+          warn "%s error when sync timezone: %s" __FUNCTION__
+            (Printexc.to_string e) ;
+          "UTC"
+      in
+      Db.Host.set_timezone ~__context ~self:localhost ~value:timezone
+  ) ;
 
   switched_sync Xapi_globs.sync_secure_boot (fun () ->
       let result =

ocaml/xapi/message_forwarding.ml

@@ -4170,6 +4170,20 @@ functor
         let local_fn = Local.Host.get_ntp_servers_status ~self in
         let remote_fn = Client.Host.get_ntp_servers_status ~self in
         do_op_on ~local_fn ~__context ~host:self ~remote_fn
+
+      let set_timezone ~__context ~self ~value =
+        info "Host.set_timezone: host = '%s'; value = '%s'"
+          (host_uuid ~__context self)
+          value ;
+        let local_fn = Local.Host.set_timezone ~self ~value in
+        let remote_fn = Client.Host.set_timezone ~self ~value in
+        do_op_on ~local_fn ~__context ~host:self ~remote_fn
+
+      let list_timezones ~__context ~self =
+        info "Host.list_timezones: host = '%s'" (host_uuid ~__context self) ;
+        let local_fn = Local.Host.list_timezones ~self in
+        let remote_fn = Client.Host.list_timezones ~self in
+        do_op_on ~local_fn ~__context ~host:self ~remote_fn
     end
 
     module Host_crashdump = struct

ocaml/xapi/xapi_globs.ml

@@ -383,6 +383,8 @@ let sync_max_cstate = "sync_max_cstate"
 
 let sync_ntp_config = "sync_ntp_config"
 
+let sync_timezone = "sync_timezone"
+
 let sync_secure_boot = "sync_secure_boot"
 
 let sync_pci_devices = "sync_pci_devices"
@@ -812,6 +814,8 @@ let ntp_dhcp_dir = ref "/run/chrony-dhcp"
 
 let ntp_client_path = ref "/usr/bin/chronyc"
 
+let timedatectl = ref "/usr/bin/timedatectl"
+
 let udhcpd_skel = ref (Filename.concat "/etc/xensource" "udhcpd.skel")
 
 let udhcpd_leases_db = ref "/var/lib/xcp/dhcp-leases.db"
@@ -1907,6 +1911,11 @@ let other_options =
     , (fun () -> !ntp_client_path)
     , "Path to the ntp client binary"
     )
+  ; ( "timedatectl"
+    , Arg.Set_string timedatectl
+    , (fun () -> !timedatectl)
+    , "Path to the timedatectl executable"
+    )
   ; gen_list_option "legacy-default-ntp-servers"
       "space-separated list of legacy default NTP servers"
       (fun s -> s)

ocaml/xapi/xapi_host.ml

@@ -1095,7 +1095,7 @@ let create ~__context ~uuid ~name_label ~name_description:_ ~hostname ~address
     ~pending_guidances_recommended:[] ~pending_guidances_full:[] ~ssh_enabled
     ~ssh_enabled_timeout ~ssh_expiry ~console_idle_timeout ~ssh_auto_mode
     ~max_cstate:"" ~secure_boot ~ntp_mode:`ntp_mode_dhcp ~ntp_custom_servers:[]
-    ~ntp_enabled:false ;
+    ~ntp_enabled:false ~timezone:"UTC" ;
   (* If the host we're creating is us, make sure its set to live *)
   Db.Host_metrics.set_last_updated ~__context ~self:metrics ~value:(Date.now ()) ;
   Db.Host_metrics.set_live ~__context ~self:metrics ~value:host_is_us ;
@@ -3561,3 +3561,23 @@ let get_ntp_servers_status ~__context ~self:_ =
     Xapi_host_ntp.get_servers_status ()
   else
     []
+
+let set_timezone ~__context ~self ~value =
+  try
+    let _ =
+      Helpers.call_script !Xapi_globs.timedatectl ["set-timezone"; value]
+    in
+    Db.Host.set_timezone ~__context ~self ~value
+  with
+  | Forkhelpers.Spawn_internal_error (stderr, _, _)
+    when String.starts_with ~prefix:"Failed to set time zone: Invalid" stderr ->
+      raise
+        (Api_errors.Server_error (Api_errors.invalid_value, ["timezone"; value]))
+  | e ->
+      Helpers.internal_error "%s" (ExnHelper.string_of_exn e)
+
+let list_timezones ~__context ~self:_ =
+  try
+    Helpers.call_script !Xapi_globs.timedatectl ["list-timezones"]
+    |> Astring.String.cuts ~empty:false ~sep:"\n"
+  with e -> Helpers.internal_error "%s" (ExnHelper.string_of_exn e)

ocaml/xapi/xapi_host.mli

@@ -627,3 +627,8 @@ val sync_ntp_config : __context:Context.t -> host:API.ref_host -> unit
 
 val get_ntp_servers_status :
   __context:Context.t -> self:API.ref_host -> (string * string) list
+
+val set_timezone :
+  __context:Context.t -> self:API.ref_host -> value:string -> unit
+
+val list_timezones : __context:Context.t -> self:API.ref_host -> string list