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https://github.com/libguestfs/libguestfs.git
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0eb23230fa
However some existing functions had names which shadowed existing functions in the List module, so I had to rename them: assoc -> List.assoc_lbl append -> List.push_back_list prepend -> List.push_front_list This is an extension of the previous commit.
129 lines
4.0 KiB
OCaml
129 lines
4.0 KiB
OCaml
(* guestfs-inspection
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* Copyright (C) 2009-2017 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 Printf
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open Std_utils
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open Utils
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let available = Optgroups.lvm2_available
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(* Check whether lvs has -S to filter its output.
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* It is available only in lvm2 >= 2.02.107.
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*)
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let lvs_has_S_opt = lazy (
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let out = command "lvm" ["lvs"; "--help"] in
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String.find out "-S" >= 0
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)
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let rec lvs () =
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let has_S = Lazy.force lvs_has_S_opt in
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if has_S then (
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let out = command "lvm" ["lvs";
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"-o"; "vg_name,lv_name";
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"-S"; "lv_role=public && lv_skip_activation!=yes";
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"--noheadings";
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"--separator"; "/"] in
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convert_lvm_output ~prefix:"/dev/" out
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)
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else (
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let out = command "lvm" ["lvs";
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"-o"; "lv_attr,vg_name,lv_name";
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"--noheadings";
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"--separator"; ":"] in
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filter_convert_old_lvs_output out
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)
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and convert_lvm_output ?prefix out =
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let lines = String.nsplit "\n" out in
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(* Skip leading and trailing ("pvs", I'm looking at you) whitespace. *)
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let lines = List.map String.trim lines in
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(* Skip empty lines. *)
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let lines = List.filter ((<>) "") lines in
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(* Ignore "unknown device" message (RHBZ#1054761). *)
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let lines = List.filter ((<>) "unknown device") lines in
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(* Add a prefix? *)
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let lines =
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match prefix with
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| None -> lines
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| Some prefix -> List.map ((^) prefix) lines in
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(* Sort and return. *)
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List.sort compare lines
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(* Filter a colon-separated output of
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* lvs -o lv_attr,vg_name,lv_name
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* removing thin layouts, and building the device path as we expect it.
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*
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* This is used only when lvm has no -S.
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*)
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and filter_convert_old_lvs_output out =
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let lines = String.nsplit "\n" out in
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let lines = List.map String.trim lines in
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let lines = List.filter ((<>) "") lines in
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let lines = List.filter ((<>) "unknown device") lines in
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let lines = List.filter_map (
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fun line ->
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match String.nsplit ":" line with
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| [ lv_attr; vg_name; lv_name ] ->
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(* Ignore thin layouts (RHBZ#1278878). *)
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if String.length lv_attr > 0 && lv_attr.[0] = 't' then None
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(* Ignore activationskip (RHBZ#1306666). *)
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else if String.length lv_attr > 9 && lv_attr.[9] = 'k' then None
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else
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Some (sprintf "/dev/%s/%s" vg_name lv_name)
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| _ ->
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None
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) lines in
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List.sort compare lines
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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 = 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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