jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * Copyright (c) 2021, Kenneth Myhra <kennethmyhra@serenityos.org>
4 * Copyright (c) 2021, Xavier Defrang <xavier.defrang@gmail.com>
5 *
6 * SPDX-License-Identifier: BSD-2-Clause
7 */
8
9#include <AK/Vector.h>
10#include <LibCore/ArgsParser.h>
11#include <LibCore/DirIterator.h>
12#include <LibCore/FilePermissionsMask.h>
13#include <LibCore/System.h>
14#include <LibMain/Main.h>
15
16ErrorOr<int> serenity_main(Main::Arguments arguments)
17{
18 TRY(Core::System::pledge("stdio rpath fattr"));
19
20 StringView mode;
21 Vector<StringView> paths;
22 bool recursive = false;
23
24 Core::ArgsParser args_parser;
25 args_parser.add_option(recursive, "Change file modes recursively", "recursive", 'R');
26 args_parser.add_positional_argument(mode, "File mode in octal or symbolic notation", "mode");
27 args_parser.add_positional_argument(paths, "Paths to file", "paths");
28 args_parser.parse(arguments);
29
30 auto mask = TRY(Core::FilePermissionsMask::parse(mode));
31
32 Function<ErrorOr<void>(StringView const&)> update_path_permissions = [&](StringView const& path) -> ErrorOr<void> {
33 auto stat = TRY(Core::System::lstat(path));
34
35 if (S_ISLNK(stat.st_mode)) {
36 // Symlinks don't get processed unless they are explicitly listed on the command line.
37 if (!paths.contains_slow(path))
38 return {};
39
40 // The chmod syscall changes the file that a link points to, so we will have to get
41 // the correct mode to base our modifications on.
42 stat = TRY(Core::System::stat(path));
43 }
44
45 TRY(Core::System::chmod(path, mask.apply(stat.st_mode)));
46
47 if (recursive && S_ISDIR(stat.st_mode)) {
48 Core::DirIterator it(path, Core::DirIterator::Flags::SkipParentAndBaseDir);
49
50 while (it.has_next())
51 TRY(update_path_permissions(it.next_full_path()));
52 }
53
54 return {};
55 };
56
57 for (auto const& path : paths) {
58 TRY(update_path_permissions(path));
59 }
60
61 return 0;
62}