jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/DeprecatedString.h>
8#include <AK/Vector.h>
9#include <LibCore/ArgsParser.h>
10#include <LibCore/DirIterator.h>
11#include <LibCore/System.h>
12#include <LibMain/Main.h>
13#include <grp.h>
14#include <pwd.h>
15#include <stdio.h>
16#include <string.h>
17#include <sys/stat.h>
18#include <unistd.h>
19
20ErrorOr<int> serenity_main(Main::Arguments arguments)
21{
22 TRY(Core::System::pledge("stdio rpath chown"));
23
24 DeprecatedString spec;
25 Vector<StringView> paths;
26 bool no_dereference = false;
27 bool recursive = false;
28 bool follow_symlinks = false;
29
30 Core::ArgsParser args_parser;
31 args_parser.set_general_help("Change the ownership of a file or directory.");
32 args_parser.add_option(no_dereference, "Don't follow symlinks", "no-dereference", 'h');
33 args_parser.add_option(recursive, "Change file ownership recursively", "recursive", 'R');
34 args_parser.add_option(follow_symlinks, "Follow symlinks while recursing into directories", nullptr, 'L');
35 args_parser.add_positional_argument(spec, "User and group IDs", "USER[:GROUP]");
36 args_parser.add_positional_argument(paths, "Paths to files", "PATH");
37 args_parser.parse(arguments);
38
39 uid_t new_uid = -1;
40 gid_t new_gid = -1;
41
42 auto parts = spec.split_view(':', SplitBehavior::KeepEmpty);
43 if (parts[0].is_empty() || (parts.size() == 2 && parts[1].is_empty()) || parts.size() > 2) {
44 warnln("Invalid uid/gid spec");
45 return 1;
46 }
47
48 auto number = parts[0].to_uint();
49 if (number.has_value()) {
50 new_uid = number.value();
51 } else {
52 auto passwd = TRY(Core::System::getpwnam(parts[0]));
53 if (!passwd.has_value()) {
54 warnln("Unknown user '{}'", parts[0]);
55 return 1;
56 }
57 new_uid = passwd->pw_uid;
58 }
59
60 if (parts.size() == 2) {
61 auto number = parts[1].to_uint();
62 if (number.has_value()) {
63 new_gid = number.value();
64 } else {
65 auto group = TRY(Core::System::getgrnam(parts[1]));
66 if (!group.has_value()) {
67 warnln("Unknown group '{}'", parts[1]);
68 return 1;
69 }
70 new_gid = group->gr_gid;
71 }
72 }
73
74 Function<ErrorOr<void>(StringView)> update_path_owner = [&](StringView path) -> ErrorOr<void> {
75 auto stat = TRY(Core::System::lstat(path));
76
77 if (S_ISLNK(stat.st_mode) && !follow_symlinks && !paths.contains_slow(path))
78 return {};
79
80 if (no_dereference) {
81 TRY(Core::System::lchown(path, new_uid, new_gid));
82 } else {
83 TRY(Core::System::chown(path, new_uid, new_gid));
84 }
85
86 if (recursive && S_ISDIR(stat.st_mode)) {
87 Core::DirIterator it(path, Core::DirIterator::Flags::SkipParentAndBaseDir);
88
89 while (it.has_next())
90 TRY(update_path_owner(it.next_full_path()));
91 }
92
93 return {};
94 };
95
96 for (auto path : paths) {
97 TRY(update_path_owner(path));
98 }
99
100 return 0;
101}