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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DirIterator.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath chown"));
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StringView spec;
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Vector<StringView> paths;
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bool no_dereference = false;
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bool recursive = false;
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bool follow_symlinks = false;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Change the ownership of a file or directory.");
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args_parser.add_option(no_dereference, "Don't follow symlinks", "no-dereference", 'h');
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args_parser.add_option(recursive, "Change file ownership recursively", "recursive", 'R');
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args_parser.add_option(follow_symlinks, "Follow symlinks while recursing into directories", nullptr, 'L');
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args_parser.add_positional_argument(spec, "User and group IDs", "USER[:GROUP]");
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args_parser.add_positional_argument(paths, "Paths to files", "PATH");
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args_parser.parse(arguments);
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uid_t new_uid = -1;
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gid_t new_gid = -1;
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auto parts = spec.split_view(':', SplitBehavior::KeepEmpty);
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if (parts[0].is_empty() || (parts.size() == 2 && parts[1].is_empty()) || parts.size() > 2) {
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warnln("Invalid uid/gid spec");
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return 1;
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}
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auto number = parts[0].to_number<uid_t>();
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if (number.has_value()) {
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new_uid = number.value();
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} else {
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auto passwd = TRY(Core::System::getpwnam(parts[0]));
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if (!passwd.has_value()) {
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warnln("Unknown user '{}'", parts[0]);
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return 1;
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}
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new_uid = passwd->pw_uid;
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}
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if (parts.size() == 2) {
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auto number = parts[1].to_number<gid_t>();
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if (number.has_value()) {
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new_gid = number.value();
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} else {
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auto group = TRY(Core::System::getgrnam(parts[1]));
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if (!group.has_value()) {
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warnln("Unknown group '{}'", parts[1]);
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return 1;
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}
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new_gid = group->gr_gid;
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}
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}
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Function<bool(StringView)> update_path_owner = [&](StringView path) {
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auto stat_or_error = Core::System::lstat(path);
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if (stat_or_error.is_error()) {
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warnln("Could not stat '{}': {}", path, stat_or_error.release_error());
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return false;
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}
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auto stat = stat_or_error.release_value();
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if (S_ISLNK(stat.st_mode) && !follow_symlinks && !paths.contains_slow(path))
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return false;
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auto success = true;
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auto maybe_error = no_dereference
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? Core::System::lchown(path, new_uid, new_gid)
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: Core::System::chown(path, new_uid, new_gid);
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if (maybe_error.is_error()) {
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warnln("Failed to change owner of '{}': {}", path, maybe_error.release_error());
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success = false;
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}
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if (recursive && S_ISDIR(stat.st_mode)) {
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Core::DirIterator it(path, Core::DirIterator::Flags::SkipParentAndBaseDir);
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while (it.has_next())
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success &= update_path_owner(it.next_full_path());
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}
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return success;
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};
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auto success = true;
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for (auto const& path : paths) {
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success &= update_path_owner(path);
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}
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return success ? 0 : 1;
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}
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