mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
751aae77bc
The name "variables" is a bit awkward and what the directory entries are really about is kernel configuration so let's make it clear with the new name.
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* Copyright (c) 2022, Alex Major
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibCore/ArgsParser.h>
|
|
#include <LibCore/DirIterator.h>
|
|
#include <LibCore/File.h>
|
|
#include <LibMain/Main.h>
|
|
|
|
static bool s_set_variable = false;
|
|
|
|
static DeprecatedString get_variable(StringView name)
|
|
{
|
|
auto path = DeprecatedString::formatted("/sys/kernel/conf/{}", name);
|
|
auto file = Core::File::open(path, Core::File::OpenMode::Read);
|
|
if (file.is_error()) {
|
|
warnln("Failed to open {}: {}", path, file.error());
|
|
return {};
|
|
}
|
|
auto buffer = file.value()->read_until_eof();
|
|
if (buffer.is_error()) {
|
|
warnln("Failed to read {}: {}", path, buffer.error());
|
|
return {};
|
|
}
|
|
return { (char const*)buffer.value().data(), buffer.value().size(), Chomp };
|
|
}
|
|
|
|
static bool read_variable(StringView name)
|
|
{
|
|
auto value = get_variable(name);
|
|
if (value.is_null())
|
|
return false;
|
|
outln("{} = {}", name, value);
|
|
return true;
|
|
}
|
|
|
|
static bool write_variable(StringView name, StringView value)
|
|
{
|
|
auto old_value = get_variable(name);
|
|
if (old_value.is_null())
|
|
return false;
|
|
auto path = DeprecatedString::formatted("/sys/kernel/conf/{}", name);
|
|
auto file = Core::File::open(path, Core::File::OpenMode::Write);
|
|
if (file.is_error()) {
|
|
warnln("Failed to open {}: {}", path, file.error());
|
|
return false;
|
|
}
|
|
if (auto result = file.value()->write_until_depleted(value.bytes()); result.is_error()) {
|
|
warnln("Failed to write {}: {}", path, result.error());
|
|
return false;
|
|
}
|
|
outln("{}: {} -> {}", name, old_value, value);
|
|
return true;
|
|
}
|
|
|
|
static int handle_variables(Vector<StringView> const& variables)
|
|
{
|
|
bool success = false;
|
|
for (auto const& variable : variables) {
|
|
auto maybe_index = variable.find('=');
|
|
if (!maybe_index.has_value()) {
|
|
success = read_variable(variable);
|
|
continue;
|
|
}
|
|
auto equal_index = maybe_index.release_value();
|
|
auto name = variable.substring_view(0, equal_index);
|
|
auto value = variable.substring_view(equal_index + 1, variable.length() - equal_index - 1);
|
|
if (name.is_empty())
|
|
warnln("Malformed setting '{}'", variable);
|
|
else if (!s_set_variable)
|
|
warnln("Must specify '-w' to set variables");
|
|
else
|
|
success = write_variable(name, value);
|
|
}
|
|
return success ? 0 : 1;
|
|
}
|
|
|
|
static int handle_show_all()
|
|
{
|
|
Core::DirIterator di("/sys/kernel/conf", Core::DirIterator::SkipDots);
|
|
if (di.has_error()) {
|
|
outln("DirIterator: {}", di.error());
|
|
return 1;
|
|
}
|
|
|
|
bool success = false;
|
|
while (di.has_next()) {
|
|
auto name = di.next_path();
|
|
success = read_variable(name);
|
|
}
|
|
return success ? 0 : 1;
|
|
}
|
|
|
|
ErrorOr<int> serenity_main(Main::Arguments arguments)
|
|
{
|
|
bool show_all = false;
|
|
Vector<StringView> variables;
|
|
|
|
Core::ArgsParser args_parser;
|
|
args_parser.set_general_help("Show or modify system-internal values. This requires root, and can crash your system.");
|
|
args_parser.add_option(show_all, "Show all variables", "all", 'a');
|
|
args_parser.add_option(s_set_variable, "Set variables", "write", 'w');
|
|
args_parser.add_positional_argument(variables, "variable[=value]", "variables", Core::ArgsParser::Required::No);
|
|
args_parser.parse(arguments);
|
|
|
|
if (!show_all && variables.is_empty()) {
|
|
args_parser.print_usage(stdout, arguments.strings[0]);
|
|
return 1;
|
|
}
|
|
|
|
if (show_all) {
|
|
// Ignore `variables`, even if they are supplied. Just like the real procps does.
|
|
return handle_show_all();
|
|
}
|
|
|
|
return handle_variables(variables);
|
|
}
|