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Mini Shell
Mini Shell
(* Intefraces module for Augeas
Author: Free Ekanayaka <free@64studio.com>
Reference: man dhclient.conf
The only difference with the reference syntax is that this lens assumes
that statements end with a new line, while the reference syntax allows
new statements to be started right after the trailing ";" of the
previous statement. This should not be a problem in real-life
configuration files as statements get usually split across several
lines, rather than merged in a single one.
*)
module Dhclient =
autoload xfm
(************************************************************************
* USEFUL PRIMITIVES
*************************************************************************)
let eol = Util.eol
let comment = Util.comment
let comment_or_eol = Util.comment_or_eol
let empty = Util.empty
(* Define separators *)
let sep_spc = del /[ \t\n]+/ " "
let sep_scl = del /[ \t]*;/ ";"
let sep_obr = del /[ \t\n]*\{\n]*/ " {\n"
let sep_cbr = del /[ \t\n]*\}/ " }"
let sep_com = del /[ \t\n]*,[ \t\n]*/ ","
let sep_slh = del "\/" "/"
let sep_col = del ":" ":"
let sep_eq = del /[ \t]*=[ \t]*/ "="
(* Define basic types *)
let word = /[A-Za-z0-9_.-]+(\[[0-9]+\])?/
(* Define fields *)
(* TODO: there could be a " " in the middle of a value ... *)
let sto_to_spc = store /[^\\#,;{}" \t\n]+|"[^\\#"\n]+"/
let sto_to_spc_noeval = store /[^=\\#,;{}" \t\n]|[^=\\#,;{}" \t\n][^\\#,;{}" \t\n]*|"[^\\#"\n]+"/
let sto_to_scl = store /[^ \t\n][^;\n]+[^ \t]|[^ \t;\n]+/
let rfc_code = [ key "code" . sep_spc . store word ]
. sep_eq
. [ label "value" . sto_to_scl ]
let eval = [ label "#eval" . Sep.equal . sep_spc . sto_to_scl ]
let sto_number = store /[0-9][0-9]*/
(************************************************************************
* SIMPLE STATEMENTS
*************************************************************************)
let stmt_simple_re = "timeout"
| "retry"
| "select-timeout"
| "reboot"
| "backoff-cutoff"
| "initial-interval"
| "do-forward-updates"
| "reject"
let stmt_simple = [ key stmt_simple_re
. sep_spc
. sto_to_spc
. sep_scl
. comment_or_eol ]
(************************************************************************
* ARRAY STATEMENTS
*************************************************************************)
(* TODO: the array could also be empty, like in the request statement *)
let stmt_array_re = "media"
| "request"
| "require"
let stmt_array = [ key stmt_array_re
. sep_spc
. counter "stmt_array"
. [ seq "stmt_array" . sto_to_spc ]
. [ sep_com . seq "stmt_array" . sto_to_spc ]*
. sep_scl . comment_or_eol ]
(************************************************************************
* HASH STATEMENTS
*************************************************************************)
let stmt_hash_re = "send"
| "option"
let stmt_args = ( [ key word . sep_spc . sto_to_spc_noeval ]
| [ key word . sep_spc . (rfc_code|eval) ] )
. sep_scl
. comment_or_eol
let stmt_hash = [ key stmt_hash_re
. sep_spc
. stmt_args ]
let stmt_opt_mod_re = "append"
| "prepend"
| "default"
| "supersede"
let stmt_opt_mod = [ key stmt_opt_mod_re
. sep_spc
. stmt_args ]
(************************************************************************
* BLOCK STATEMENTS
*************************************************************************)
let stmt_block_re = "interface"
| "lease"
| "alias"
let stmt_block_opt_re = "interface"
| "script"
| "bootp"
| "fixed-address"
| "filename"
| "server-name"
| "medium"
| "vendor option space"
(* TODO: some options could take no argument like bootp *)
let stmt_block_opt = [ key stmt_block_opt_re
. sep_spc
. sto_to_spc
. sep_scl
. comment_or_eol ]
let stmt_block_date_re
= "renew"
| "rebind"
| "expire"
let stmt_block_date = [ key stmt_block_date_re
. [ sep_spc . label "weekday" . sto_number ]
. [ sep_spc . label "year" . sto_number ]
. [ sep_slh . label "month" . sto_number ]
. [ sep_slh . label "day" . sto_number ]
. [ sep_spc . label "hour" . sto_number ]
. [ sep_col . label "minute" . sto_number ]
. [ sep_col . label "second" . sto_number ]
. sep_scl
. comment_or_eol ]
let stmt_block_arg = sep_spc . sto_to_spc
let stmt_block_entry = sep_spc
. ( stmt_array
| stmt_hash
| stmt_opt_mod
| stmt_block_opt
| stmt_block_date )
let stmt_block = [ key stmt_block_re
. stmt_block_arg?
. sep_obr
. stmt_block_entry+
. sep_cbr
. comment_or_eol ]
(************************************************************************
* LENS & FILTER
*************************************************************************)
let statement = (stmt_simple|stmt_opt_mod|stmt_array|stmt_hash|stmt_block)
let lns = ( empty
| comment
| statement )*
let filter = incl "/etc/dhcp3/dhclient.conf"
. incl "/etc/dhcp/dhclient.conf"
. incl "/etc/dhclient.conf"
let xfm = transform lns filter
Zerion Mini Shell 1.0