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(* guestfs-inspection
* Copyright (C) 2009-2019 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 Unix
open Printf
open Std_utils
external get_verbose_flag : unit -> bool = "guestfs_int_daemon_get_verbose_flag" "noalloc"
external is_device_parameter : string -> bool = "guestfs_int_daemon_is_device_parameter" "noalloc"
external is_root_device : string -> bool = "guestfs_int_daemon_is_root_device" "noalloc"
external prog_exists : string -> bool = "guestfs_int_daemon_prog_exists" "noalloc"
external udev_settle : ?filename:string -> unit -> unit = "guestfs_int_daemon_udev_settle" "noalloc"
let commandr ?(fold_stdout_on_stderr = false) prog args =
if verbose () then
eprintf "command:%s %s\n%!"
(if fold_stdout_on_stderr then " fold-stdout-on-stderr" else "")
(stringify_args (prog :: args));
let argv = Array.of_list (prog :: args) in
let stdin_fd = openfile "/dev/null" [O_RDONLY] 0 in
let stdout_file, stdout_fd =
let filename, chan = Filename.open_temp_file "cmd" ".out" in
filename, descr_of_out_channel chan in
let stderr_file, stderr_fd =
let filename, chan = Filename.open_temp_file "cmd" ".err" in
filename, descr_of_out_channel chan in
let pid = fork () in
if pid = 0 then (
(* Child process. *)
dup2 stdin_fd stdin;
close stdin_fd;
if not fold_stdout_on_stderr then
dup2 stdout_fd stdout
else
dup2 stderr_fd stdout;
close stdout_fd;
dup2 stderr_fd stderr;
close stderr_fd;
execvp prog argv
);
(* Parent process. *)
close stdin_fd;
close stdout_fd;
close stderr_fd;
let _, status = waitpid [] pid in
let r =
match status with
| WEXITED i -> i
| WSIGNALED i ->
failwithf "external command ā%sā killed by signal %d" prog i
| WSTOPPED i ->
failwithf "external command ā%sā stopped by signal %d" prog i in
if verbose () then
eprintf "command: %s returned %d\n" prog r;
let stdout = read_whole_file stdout_file in
let stderr = read_whole_file stderr_file in
(try unlink stdout_file with _ -> ());
(try unlink stderr_file with _ -> ());
if verbose () then (
if stdout <> "" then (
eprintf "command: %s: stdout:\n%s%!" prog stdout;
if not (String.is_suffix stdout "\n") then eprintf "\n%!"
);
if stderr <> "" then (
eprintf "command: %s: stderr:\n%s%!" prog stderr;
if not (String.is_suffix stderr "\n") then eprintf "\n%!"
)
);
(* Strip trailing \n from stderr but NOT from stdout. *)
let stderr = String.chomp stderr in
(r, stdout, stderr)
let command ?fold_stdout_on_stderr prog args =
let r, stdout, stderr = commandr ?fold_stdout_on_stderr prog args in
if r <> 0 then
failwithf "%s exited with status %d: %s" prog r stderr;
stdout
(* XXX This function is copied from C, but is misconceived. It
* cannot by design work for devices like /dev/md0. It would be
* better if it checked for the existence of devices and partitions
* in /sys/block so we know what the kernel thinks is a device or
* partition. The same applies to APIs such as part_to_partnum
* and part_to_dev which rely on this function.
*)
let split_device_partition dev =
(* Skip /dev/ prefix if present. *)
let dev =
if String.is_prefix dev "/dev/" then
String.sub dev 5 (String.length dev - 5)
else dev in
(* Find the partition number (if present). *)
let dev, part =
let n = String.length dev in
let i = ref n in
while !i >= 1 && Char.isdigit dev.[!i-1] do
decr i
done;
let i = !i in
if i = n then
dev, 0 (* no partition number, whole device *)
else
String.sub dev 0 i, int_of_string (String.sub dev i (n-i)) in
(* Deal with device names like /dev/md0p1. *)
(* XXX This function is buggy (as was the old C function) when
* presented with a whole device like /dev/md0.
*)
let dev =
let n = String.length dev in
if n < 2 || dev.[n-1] <> 'p' || not (Char.isdigit dev.[n-2]) then
dev
else (
let i = ref (n-1) in
while !i >= 0 && Char.isdigit dev.[!i] do
decr i;
done;
let i = !i in
String.sub dev 0 i
) in
dev, part
let rec sort_device_names devs =
List.sort compare_device_names devs
and compare_device_names a b =
(* This takes the device name like "/dev/sda1" and returns ("sda", 1). *)
let dev_a, part_a = split_device_partition a
and dev_b, part_b = split_device_partition b in
(* Skip "sd|hd|ubd..." so that /dev/sda and /dev/vda sort together.
* (This is what the old C function did, but it's not clear if it
* is still relevant. XXX)
*)
let skip_prefix dev =
let n = String.length dev in
if n >= 2 && dev.[1] = 'd' then
String.sub dev 2 (String.length dev - 2)
else if n >= 3 && dev.[2] = 'd' then
String.sub dev 3 (String.length dev - 3)
else
dev in
let dev_a = skip_prefix dev_a
and dev_b = skip_prefix dev_b in
(* If device name part is longer, it is always greater, eg.
* "/dev/sdz" < "/dev/sdaa".
*)
let r = compare (String.length dev_a) (String.length dev_b) in
if r <> 0 then r
else (
(* Device name parts are the same length, so do a regular compare. *)
let r = compare dev_a dev_b in
if r <> 0 then r
else (
(* Device names are identical, so compare partition numbers. *)
compare part_a part_b
)
)
let proc_unmangle_path path =
let n = String.length path in
let b = Buffer.create n in
let rec loop i =
if i < n-3 && path.[i] = '\\' then (
let to_int c = Char.code c - Char.code '0' in
let v =
(to_int path.[i+1] lsl 6) lor
(to_int path.[i+2] lsl 3) lor
to_int path.[i+3] in
Buffer.add_char b (Char.chr v);
loop (i+4)
)
else if i < n then (
Buffer.add_char b path.[i];
loop (i+1)
)
else
Buffer.contents b
in
loop 0
let is_small_file path =
is_regular_file path &&
(stat path).st_size <= 2 * 1048 * 1024
let read_small_file filename =
if not (is_small_file filename) then (
eprintf "%s: not a regular file or too large\n" filename;
None
)
else (
let content = read_whole_file filename in
let lines = String.nsplit "\n" content in
Some lines
)
let unix_canonical_path path =
let is_absolute = String.length path > 0 && path.[0] = '/' in
let path = String.nsplit "/" path in
let path = List.filter ((<>) "") path in
(if is_absolute then "/" else "") ^ String.concat "/" path
let simple_unquote s =
let n = String.length s in
if n >= 2 &&
((s.[0] = '"' && s.[n-1] = '"') || (s.[0] = '\'' && s.[n-1] = '\'')) then
String.sub s 1 (n-2)
else
s
let parse_key_value_strings ?unquote lines =
let lines = List.filter ((<>) "") lines in
let lines = List.filter (fun s -> s.[0] <> '#') lines in
let lines = List.map (String.split "=") lines in
match unquote with
| None -> lines
| Some f -> List.map (fun (k, v) -> (k, f v)) lines
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