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ed4c2f2f8e
This generally seems like a better name, especially if we somehow also need a better name for "read the entire buffer, but not the entire file" somewhere down the line.
120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Alex Major
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DirIterator.h>
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#include <LibCore/Stream.h>
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#include <LibMain/Main.h>
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static bool s_set_variable = false;
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static DeprecatedString get_variable(StringView name)
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{
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auto path = DeprecatedString::formatted("/sys/kernel/variables/{}", name);
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auto file = Core::Stream::File::open(path, Core::Stream::OpenMode::Read);
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if (file.is_error()) {
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warnln("Failed to open {}: {}", path, file.error());
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return {};
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}
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auto buffer = file.value()->read_until_eof();
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if (buffer.is_error()) {
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warnln("Failed to read {}: {}", path, buffer.error());
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return {};
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}
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return { (char const*)buffer.value().data(), buffer.value().size(), Chomp };
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}
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static bool read_variable(StringView name)
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{
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auto value = get_variable(name);
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if (value.is_null())
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return false;
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outln("{} = {}", name, value);
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return true;
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}
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static bool write_variable(StringView name, StringView value)
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{
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auto old_value = get_variable(name);
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if (old_value.is_null())
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return false;
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auto path = DeprecatedString::formatted("/sys/kernel/variables/{}", name);
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auto file = Core::Stream::File::open(path, Core::Stream::OpenMode::Write);
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if (file.is_error()) {
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warnln("Failed to open {}: {}", path, file.error());
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return false;
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}
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if (auto result = file.value()->write(value.bytes()); result.is_error()) {
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warnln("Failed to write {}: {}", path, result.error());
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return false;
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}
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outln("{}: {} -> {}", name, old_value, value);
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return true;
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}
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static int handle_variables(Vector<StringView> const& variables)
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{
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bool success = false;
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for (auto const& variable : variables) {
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auto maybe_index = variable.find('=');
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if (!maybe_index.has_value()) {
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success = read_variable(variable);
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continue;
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}
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auto equal_index = maybe_index.release_value();
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auto name = variable.substring_view(0, equal_index);
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auto value = variable.substring_view(equal_index + 1, variable.length() - equal_index - 1);
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if (name.is_empty())
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warnln("Malformed setting '{}'", variable);
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else if (!s_set_variable)
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warnln("Must specify '-w' to set variables");
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else
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success = write_variable(name, value);
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}
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return success ? 0 : 1;
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}
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static int handle_show_all()
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{
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Core::DirIterator di("/sys/kernel/variables", Core::DirIterator::SkipDots);
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if (di.has_error()) {
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outln("DirIterator: {}", di.error_string());
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return 1;
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}
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bool success = false;
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while (di.has_next()) {
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auto name = di.next_path();
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success = read_variable(name);
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}
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return success ? 0 : 1;
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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bool show_all = false;
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Vector<StringView> variables;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Show or modify system-internal values. This requires root, and can crash your system.");
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args_parser.add_option(show_all, "Show all variables", "all", 'a');
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args_parser.add_option(s_set_variable, "Set variables", "write", 'w');
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args_parser.add_positional_argument(variables, "variable[=value]", "variables", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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if (!show_all && variables.is_empty()) {
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args_parser.print_usage(stdout, arguments.argv[0]);
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return 1;
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}
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if (show_all) {
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// Ignore `variables`, even if they are supplied. Just like the real procps does.
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return handle_show_all();
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}
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return handle_variables(variables);
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}
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