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(* virt-v2v
* Copyright (C) 2009-2019 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 Std_utils
open Tools_utils
open Unix_utils
open Common_gettext.Gettext
open Utils
type t = {
uid : int option;
gid : int option;
}
let create ?uid ?gid () = { uid = uid; gid = gid }
let with_fork { uid; gid } name f =
let pid = fork () in
if pid = 0 then (
(* Child. *)
Option.may setgid gid;
Option.may setuid uid;
(try f ()
with exn ->
eprintf "%s: changeuid: %s: %s\n%!" prog name (Printexc.to_string exn);
Exit._exit 1
);
Exit._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 (sprintf "mkdir: %s" path) (fun () -> mkdir path perm)
let rmdir t path =
with_fork t (sprintf "rmdir: %s" path) (fun () -> rmdir path)
let output t path f =
with_fork t path (fun () -> with_open_out path f)
let make_file t path content =
output t path (fun chan -> output_string chan content)
let unlink t path =
with_fork t (sprintf "unlink: %s" path) (fun () -> unlink path)
let func t = with_fork t "func"
let command t cmd =
with_fork t cmd (
fun () ->
let r = Sys.command cmd in
if r <> 0 then failwith "external command failed"
)
|
