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/*
SPDX-FileCopyrightText: 2019 David Edmundson <davidedmundson@kde.org>
SPDX-FileCopyrightText: 2020 David Redondo <kde@david-redondo.de>
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include "cgroup.h"
#include <QDebug>
#include <QDir>
#include <QFile>
#include <QPointer>
#include <QRegularExpression>
#include <QRegularExpressionMatch>
#include <QStandardPaths>
#include <QStringView>
#include <QThreadPool>
#include "process.h"
#include <ranges>
using namespace KSysGuard;
class KSysGuard::CGroupPrivate
{
public:
CGroupPrivate(const QString &_processGroupId)
: processGroupId(_processGroupId)
, service(serviceFromAppId(_processGroupId))
{
}
const QString processGroupId;
const KService::Ptr service;
QList<pid_t> pids;
static KService::Ptr serviceFromAppId(const QString &appId);
static QRegularExpression s_appIdFromProcessGroupPattern;
static QString unescapeName(const QString &cgroupId);
class ReadPidsRunnable;
};
class CGroupPrivate::ReadPidsRunnable : public QRunnable
{
public:
ReadPidsRunnable(QObject *context, const QString &path, std::function<void(QList<pid_t>)> callback)
: m_context(context)
, m_path(path)
, m_callback(callback)
{
}
void run() override
{
QFile pidFile(m_path);
if (!pidFile.open(QFile::ReadOnly | QIODevice::Text)) {
return;
}
QTextStream stream(&pidFile);
QList<pid_t> pids;
QString line = stream.readLine();
while (!line.isNull()) {
pids.append(line.toLong());
line = stream.readLine();
}
// Ensure we call the callback on the thread the context object lives on.
if (m_context) {
QMetaObject::invokeMethod(m_context, std::bind(m_callback, pids));
}
}
private:
QPointer<QObject> m_context;
QString m_path;
std::function<void(QList<pid_t>)> m_callback;
};
class CGroupSystemInformation
{
public:
CGroupSystemInformation();
QString sysGgroupRoot;
};
Q_GLOBAL_STATIC(CGroupSystemInformation, s_cGroupSystemInformation)
// The spec says that the two following schemes are allowed
// - app[-<launcher>]-<ApplicationID>-<RANDOM>.scope
// - app[-<launcher>]-<ApplicationID>[@<RANDOM>].service
// Flatpak's are currently in a cgroup, but they don't follow the specification
// this has been fixed, but this provides some compatibility till that lands
// app vs apps exists because the spec changed.
// We allow app[-<launcher>]-<ApplicationID>[@<RANDOM>].slice which is not standard but very close for gnome terminal
QRegularExpression
CGroupPrivate::s_appIdFromProcessGroupPattern(QStringLiteral("(apps|app|flatpak)-(?:[^-]*-)?([^-]+(?=-.*\\.scope)|[^@]+(?=(?:@.*)?\\.service|.slice))"));
CGroup::CGroup(const QString &id)
: d(new CGroupPrivate(id))
{
}
CGroup::~CGroup()
{
}
QString KSysGuard::CGroup::id() const
{
return d->processGroupId;
}
KService::Ptr KSysGuard::CGroup::service() const
{
return d->service;
}
QList<pid_t> CGroup::pids() const
{
return d->pids;
}
void CGroup::setPids(const QList<pid_t> &pids)
{
d->pids = pids;
}
void CGroup::requestPids(QObject *context, std::function<void(QList<pid_t>)> callback)
{
QString path = cgroupSysBasePath() + d->processGroupId + QLatin1String("/cgroup.procs");
auto readPidsRunnable = new CGroupPrivate::ReadPidsRunnable(context, path, callback);
QThreadPool::globalInstance()->start(readPidsRunnable);
}
QString CGroupPrivate::unescapeName(const QString &name)
{
// strings are escaped in the form of \xZZ where ZZ is a two digits in hex representing an ascii code
QString rc = name;
while (true) {
int escapeCharIndex = rc.indexOf(QLatin1Char('\\'));
if (escapeCharIndex < 0) {
break;
}
const QStringView sequence = QStringView(rc).mid(escapeCharIndex, 4);
if (sequence.length() != 4 || sequence.at(1) != QLatin1Char('x')) {
qWarning() << "Badly formed cgroup name" << name;
return name;
}
bool ok;
int character = sequence.mid(2).toInt(&ok, 16);
if (ok) {
rc.replace(escapeCharIndex, 4, QLatin1Char(character));
}
}
return rc;
}
KService::Ptr CGroupPrivate::serviceFromAppId(const QString &processGroup)
{
const auto parts = processGroup.split(QLatin1Char('/'));
QString appId;
for (const auto &cgroupId : std::ranges::reverse_view(parts)) {
const auto &appIdMatch = s_appIdFromProcessGroupPattern.match(cgroupId);
if (appIdMatch.isValid() && appIdMatch.hasMatch()) {
appId = unescapeName(appIdMatch.captured(2));
break;
}
}
if (appId.isEmpty()) {
// create a transient service object just to have a sensible name
return KService::Ptr(new KService(parts.last(), QString(), QString()));
}
KService::Ptr service = KService::serviceByMenuId(appId + QStringLiteral(".desktop"));
if (!service && processGroup.endsWith(QLatin1String("@autostart.service"))) {
auto file = QStandardPaths::locate(QStandardPaths::GenericConfigLocation, QLatin1String("autostart/%1.desktop").arg(appId));
if (!file.isEmpty()) {
service = new KService(file);
}
}
if (!service) {
service = new KService(appId, QString(), QString());
}
return service;
}
QString CGroup::cgroupSysBasePath()
{
return s_cGroupSystemInformation->sysGgroupRoot;
}
CGroupSystemInformation::CGroupSystemInformation()
{
QDir base(QStringLiteral("/sys/fs/cgroup"));
if (base.exists(QLatin1String("unified"))) {
sysGgroupRoot = base.absoluteFilePath(QStringLiteral("unified"));
return;
}
if (base.exists()) {
sysGgroupRoot = base.absolutePath();
}
}
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