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vmm_unix: ensure lazy uname being called only once

This commit is contained in:
Hannes Mehnert 2019-01-20 16:43:18 +01:00
parent 7b8f8fafbd
commit 15e1f5ecf6
1 changed files with 7 additions and 8 deletions
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15
src/vmm_unix.ml
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@ -71,13 +71,14 @@ let rec fifo_exists file =
| Unix.Unix_error (e, _, _) ->
R.error_msgf "file %a exists: %s" Fpath.pp file (Unix.error_message e)
let uname () =
let uname =
let cmd = Bos.Cmd.(v "uname" % "-s") in
lazy Bos.OS.Cmd.(run_out cmd |> out_string)
lazy (match Bos.OS.Cmd.(run_out cmd |> out_string) with
| Ok (s, _) -> s
| Error (`Msg m) -> invalid_arg m)
let create_tap bridge =
Lazy.force (uname ()) >>= fun (sys, _) ->
match sys with
match Lazy.force uname with
| x when x = "FreeBSD" ->
let cmd = Bos.Cmd.(v "ifconfig" % "tap" % "create") in
Bos.OS.Cmd.run_out cmd |> Bos.OS.Cmd.out_string >>= fun (name, _) ->
@ -98,8 +99,7 @@ let create_tap bridge =
| x -> Error (`Msg ("unsupported operating system " ^ x))
let destroy_tap tapname =
Lazy.force (uname ()) >>= fun (sys, _) ->
match sys with
match Lazy.force uname with
| x when x = "FreeBSD" ->
Bos.OS.Cmd.run Bos.Cmd.(v "ifconfig" % tapname % "destroy")
| x when x = "Linux" ->
@ -139,9 +139,8 @@ let shutdown name vm =
List.fold_left (fun r n -> r >>= fun () -> destroy_tap n) (Ok ()) vm.Unikernel.taps
let cpuset cpu =
Lazy.force (uname ()) >>= fun (sys, _) ->
let cpustring = string_of_int cpu in
match sys with
match Lazy.force uname with
| x when x = "FreeBSD" ->
Ok ([ "cpuset" ; "-l" ; cpustring ])
| x when x = "Linux" ->