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(* guestfs-inspection
* Copyright (C) 2009-2020 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.
*)
open Unix
open Utils
(* Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
* to a canonical one.
*
* This is harder than it should be. A LV device like /dev/VG/LV is
* really a symlink to a device-mapper device like /dev/dm-0. However
* at the device-mapper (kernel) level, nothing is really known about
* LVM (a userspace concept). Therefore we use a convoluted method to
* determine this, by listing out known LVs and checking whether the
* rdev (major/minor) of the device we are passed matches any of them.
*
* Note use of 'stat' instead of 'lstat' so that symlinks are fully
* resolved.
*)
let lv_canonical device =
let stat1 = stat device in
let lvs = Lvm.lvs () in
try
Some (
List.find (
fun lv ->
let stat2 = stat lv in
stat1.st_rdev = stat2.st_rdev
) lvs
)
with
| Not_found -> None
|
