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(* libguestfs
* Copyright (C) 2009-2012 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
*)
(* Please read generator/README first. *)
open Unix
open Printf
open Utils
(* Output channel, 'pr' prints to this. *)
let chan = ref Pervasives.stdout
(* Number of lines generated. *)
let lines = ref 0
(* Name of each file generated. *)
let files = ref []
let fileshash = Hashtbl.create 13
(* Print-to-current-output function, used everywhere. It has
* printf-like semantics.
*)
let pr fs =
ksprintf
(fun str ->
let i = count_chars '\n' str in
lines := !lines + i;
output_string !chan str
) fs
let output_to ?(perm = 0o444) filename k =
files := filename :: !files;
Hashtbl.add fileshash filename ();
let filename_new = filename ^ ".new" in
chan := open_out filename_new;
k ();
close_out !chan;
chan := Pervasives.stdout;
(* Is the new file different from the current file? *)
if Sys.file_exists filename && files_equal filename filename_new then
unlink filename_new (* same, so skip it *)
else (
(* different, overwrite old one *)
(try chmod filename 0o644 with Unix_error _ -> ());
rename filename_new filename;
chmod filename perm;
printf "written %s\n%!" filename;
)
let delete_except_generated ?(skip = []) glob =
let cmd = sprintf "ls -1 %s" glob in
let chan = open_process_in cmd in
let lines = ref [] in
let rec loop () =
lines := input_line chan :: !lines;
loop ()
in
let lines = try loop () with End_of_file -> List.rev !lines in
(match close_process_in chan with
| WEXITED 0 -> ()
| WEXITED i ->
failwithf "command exited with non-zero status (%d)" i
| WSIGNALED i | WSTOPPED i ->
failwithf "command signalled or stopped with non-zero status (%d)" i
);
(* Build the final skip hash. *)
let skiphash = Hashtbl.copy fileshash in
List.iter (fun filename -> Hashtbl.add skiphash filename ()) skip;
(* Remove the files. *)
List.iter (
fun filename ->
if not (Hashtbl.mem skiphash filename) then (
unlink filename;
printf "deleted %s\n%!" filename
)
) lines
let get_lines_generated () =
!lines
let get_files_generated () =
List.rev !files
|
