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(*
Module: LVM
Parses LVM metadata.
Author: Gabriel de Perthuis <g2p.code+augeas@gmail.com>
About: License
This file is licensed under the LGPL v2+.
About: Configuration files
This lens applies to files in /etc/lvm/backup and /etc/lvm/archive.
About: Examples
The <Test_LVM> file contains various examples and tests.
*)
module LVM =
autoload xfm
(* See lvm2/libdm/libdm-config.c for tokenisation;
* libdm uses a blacklist but I prefer the safer whitelist approach. *)
(* View: identifier
* The left hand side of a definition *)
let identifier = /[a-zA-Z0-9_-]+/
(* strings can contain backslash-escaped dquotes, but I don't know
* how to get the message across to augeas *)
let str = [label "str". Quote.do_dquote (store /([^\"]|\\\\.)*/)]
let int = [label "int". store Rx.relinteger]
(* View: flat_literal
* A literal without structure *)
let flat_literal = int|str
(* allow multiline and mixed int/str, used for raids and stripes *)
(* View: list
* A list containing flat literals *)
let list = [
label "list" . counter "list"
. del /\[[ \t\n]*/ "["
.([seq "list". flat_literal . del /,[ \t\n]*/ ", "]*
. [seq "list". flat_literal . del /[ \t\n]*/ ""])?
. Util.del_str "]"]
(* View: val
* Any value that appears on the right hand side of an assignment *)
let val = flat_literal | list
(* View: nondef
* A line that doesn't contain a statement *)
let nondef =
Util.empty
| Util.comment
(* Build.block couldn't be reused, because of recursion and
* a different philosophy of whitespace handling. *)
(* View: def
* An assignment, or a block containing definitions *)
let rec def = [
Util.indent . key identifier . (
del /[ \t]*\{\n/ " {\n"
.[label "dict".(nondef | def)*]
. Util.indent . Util.del_str "}\n"
|Sep.space_equal . val . Util.comment_or_eol)]
(* View: lns
* The main lens *)
let lns = (nondef | def)*
let filter =
incl "/etc/lvm/archive/*.vg"
. incl "/etc/lvm/backup/*"
. incl "/etc/lvm/lvm.conf"
. Util.stdexcl
let xfm = transform lns filter