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49 lines
1.6 KiB
OCaml
49 lines
1.6 KiB
OCaml
(* guestfs-inspection
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* Copyright (C) 2009-2023 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*)
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open Unix
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open Utils
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(* Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0
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* to a canonical one.
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*
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* This is harder than it should be. A LV device like /dev/VG/LV is
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* really a symlink to a device-mapper device like /dev/dm-0. However
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* at the device-mapper (kernel) level, nothing is really known about
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* LVM (a userspace concept). Therefore we use a convoluted method to
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* determine this, by listing out known LVs and checking whether the
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* rdev (major/minor) of the device we are passed matches any of them.
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*
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* Note use of 'stat' instead of 'lstat' so that symlinks are fully
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* resolved.
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*)
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let lv_canonical device =
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let stat1 = stat device in
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let lvs = Lvm.lvs () in
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try
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Some (
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List.find (
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fun lv ->
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let stat2 = stat lv in
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stat1.st_rdev = stat2.st_rdev
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) lvs
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)
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with
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| Not_found -> None
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