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|
(* libguestfs OCaml bindings
* Copyright (C) 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.
*)
(* Test guestfs_mount_local, from a higher level language (it will
* mostly be used first from Python), in parallel threads. OCaml
* allows us to test this at a reasonable speed.
*)
open Unix
open Printf
let (//) = Filename.concat
(* See [exit.c]. *)
external _exit : int -> 'a = "ocaml_guestfs__exit"
(* Some settings. *)
let total_time = 60. (* seconds, excluding launch *)
let debug = true (* overview debugging messages *)
let min_threads = 2
let max_threads = 12
let mbytes_per_thread = 900
let clip low high v = min high (max low v)
let rec main () =
Random.self_init ();
(* Choose the number of threads based on the amount of free memory. *)
let nr_threads =
let mbytes =
let cmd = "LANG=C free -m | grep 'buffers/cache' | awk '{print $NF}'" in
let chan = open_process_in cmd in
let mbytes = input_line chan in
match close_process_in chan with
| WEXITED 0 -> Some (int_of_string mbytes)
| _ -> None in
match mbytes with
| None -> min_threads (* default *)
| Some mbytes ->
clip min_threads max_threads (mbytes / mbytes_per_thread) in
let threads = ref [] in
for i = 1 to nr_threads do
let filename = sprintf "test%d.img" i in
let mp = sprintf "mp%d" i in
(try rmdir mp with Unix_error _ -> ());
mkdir mp 0o700;
if debug then eprintf "%s : starting thread\n%!" mp;
let t = Thread.create start_thread (filename, mp) in
threads := (t, filename, mp) :: !threads
done;
(* Wait until the threads terminate and delete the files and mountpoints. *)
List.iter (
fun (t, filename, mp) ->
Thread.join t;
if debug then eprintf "%s : cleaning up thread\n%!" mp;
unlink filename;
rmdir mp
) !threads;
Gc.compact ()
and start_thread (filename, mp) =
(* Create a filesystem for the tests. *)
let g = new Guestfs.guestfs () in
let fd = openfile filename [O_WRONLY;O_CREAT;O_NOCTTY;O_TRUNC] 0o666 in
ftruncate fd (500 * 1024 * 1024);
close fd;
g#add_drive_opts filename;
g#launch ();
g#part_disk "/dev/sda" "mbr";
g#mkfs "ext2" "/dev/sda1";
g#mount "/dev/sda1" "/";
(* Randomly mount the filesystem and repeat. Keep going until we
* finish the test.
*)
let start_t = time () in
let rec loop () =
let t = time () in
if t -. start_t < total_time then (
if debug then eprintf "%s < mounting filesystem\n%!" mp;
g#mount_local mp;
(* Run test in an exec'd subprocess. *)
let args = [| Sys.executable_name; "--test"; mp |] in
let pid = fork () in
if pid = 0 then ( (* child *)
try execv Sys.executable_name args
with exn -> prerr_endline (Printexc.to_string exn); _exit 1
);
(* Run FUSE main loop. This processes requests until the
* subprocess unmounts the filesystem.
*)
g#mount_local_run ();
let _, status = waitpid [] pid in
(match status with
| WEXITED 0 -> ()
| WEXITED i ->
eprintf "test subprocess failed (exit code %d)\n" i;
exit 1
| WSIGNALED i | WSTOPPED i ->
eprintf "test subprocess signaled/stopped (signal %d)\n" i;
exit 1
);
loop ()
)
in
loop ();
g#close ()
(* This is run in a child program. *)
and test_mountpoint mp =
if debug then eprintf "%s | testing filesystem\n%!" mp;
(* Run through the same set of tests repeatedly a number of times.
* The aim of this stress test is repeated mount/unmount, not testing
* FUSE itself, so we don't do much here.
*)
for pass = 0 to Random.int 32 do
mkdir (mp // "tmp.d") 0o700;
let chan = open_out (mp // "file") in
let s = String.make (Random.int (128 * 1024)) (Char.chr (Random.int 256)) in
output_string chan s;
close_out chan;
rename (mp // "tmp.d") (mp // "newdir");
link (mp // "file") (mp // "newfile");
if Random.int 32 = 0 then sleep 1;
rmdir (mp // "newdir");
unlink (mp // "file");
unlink (mp // "newfile")
done;
if debug then eprintf "%s > unmounting filesystem\n%!" mp;
unmount mp
(* We may need to retry this a few times because of processes which
* run in the background jumping into mountpoints. Only display
* errors if it still fails after many retries.
*)
and unmount mp =
let logfile = sprintf "%s.fusermount.log" mp in
let unlink_logfile () =
try unlink logfile with Unix_error _ -> ()
in
unlink_logfile ();
let run_command () =
Sys.command (sprintf "fusermount -u %s >> %s 2>&1"
(Filename.quote mp) (Filename.quote logfile)) = 0
in
let rec loop tries =
if tries <= 5 then (
if not (run_command ()) then (
sleep 1;
loop (tries+1)
)
) else (
ignore (Sys.command (sprintf "cat %s" (Filename.quote logfile)));
eprintf "fusermount: %s: failed, see earlier error messages\n" mp;
exit 1
)
in
loop 0;
unlink_logfile ()
let () =
match Array.to_list Sys.argv with
| [ _; "--test"; mp ] -> test_mountpoint mp
| [ _ ] -> main ()
| _ ->
eprintf "%s: unknown arguments given to program\n" Sys.executable_name;
exit 1
|
