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(* virt-customize
* Copyright (C) 2016 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 Std_utils
open Tools_utils
open Common_gettext.Gettext
module G = Guestfs
let append_line (g : G.guestfs) root path line =
(* The default line ending for this guest type. This is only
* used when we don't know anything more about the file.
*)
let default_newline () =
match g#inspect_get_type root with
| "windows" -> "\r\n"
| _ -> "\n"
in
if not (g#exists path) then (
g#write path (line ^ default_newline ())
)
else (
(* Stat the file. We want to know it's a regular file, and
* also its size.
*)
let { G.st_mode; st_size = size } = g#statns path in
if Int64.logand st_mode 0o170000_L <> 0o100000_L then
error (f_"append_line: %s is not a file") path;
(* Guess the line ending from the first part of the file, else
* use the default for this guest type.
*)
let newline =
let content = g#pread path 8192 0L in
if String.find content "\r\n" >= 0 then "\r\n"
else if String.find content "\n" >= 0 then "\n"
else if String.find content "\r" >= 0 then "\r"
else default_newline () in
let line = line ^ newline in
(* Do we need to append a newline to the existing file? *)
let last_chars =
let len = String.length newline in
if size <= 0L then newline (* empty file ends in virtual newline *)
else if size >= Int64.of_int len then
g#pread path len (size -^ Int64.of_int len)
else
g#pread path len 0L in
let line =
if last_chars = newline then line
else newline ^ line in
(* Finally, append. *)
g#write_append path line
)
|
