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(* virt-v2v
* Copyright (C) 2009-2014 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
(* Functions for making files and directories as another user. *)
open Unix
open Printf
open Common_gettext.Gettext
open Utils
type t = {
uid : int option;
gid : int option;
}
let create ?uid ?gid () = { uid = uid; gid = gid }
(* Call _exit directly, ie. do not run OCaml atexit handlers. *)
external _exit : int -> unit = "v2v_exit" "noalloc"
let with_fork { uid = uid; gid = gid } f =
let pid = fork () in
if pid = 0 then ( (* child *)
(match gid with None -> () | Some gid -> setgid gid);
(match uid with None -> () | Some uid -> setuid uid);
(try f ()
with exn ->
eprintf "%s: KVM uid wrapper: %s\n%!" prog (Printexc.to_string exn);
_exit 1
);
_exit 0
);
(* parent *)
let _, status = waitpid [] pid in
match status with
| WEXITED 0 -> ()
| WEXITED i ->
error (f_"subprocess exited with non-zero error code %d") i
| WSIGNALED i | WSTOPPED i ->
error (f_"subprocess signalled or stopped by signal %d") i
let mkdir t path perm =
with_fork t (fun () -> mkdir path perm)
let rmdir t path =
with_fork t (fun () -> rmdir path)
let output t path f =
with_fork t (
fun () ->
let chan = open_out path in
f chan;
close_out chan
)
let make_file t path content =
output t path (fun chan -> output_string chan content)
let unlink t path =
with_fork t (fun () -> unlink path)
let func t f = with_fork t f
let command t cmd =
with_fork t (
fun () ->
let r = Sys.command cmd in
if r <> 0 then failwith "external command failed"
)
|
