inputaccess.cpp

#include "inputaccess.h"
#include <QDir>
#include <QFile>
#include <QProcess>
#include <QTemporaryFile>

QString InputAccess::ruleDestinationPath()
{
    return QStringLiteral("/etc/udev/rules.d/71-trackclick-input.rules");
}

QString InputAccess::bundledRuleText()
{
    QFile res(QStringLiteral(":/linux/71-trackclick-input.rules"));
    if (!res.open(QIODevice::ReadOnly | QIODevice::Text))
        return {};
    return QString::fromUtf8(res.readAll());
}

InputAccess::InstallResult InputAccess::installUdevRule()
{
    const QString ruleText = bundledRuleText();
    if (ruleText.isEmpty())
        return InstallResult::RuleUnavailable;

    QString tmpPath;
    {
        QTemporaryFile tmp(QDir::tempPath() + QStringLiteral("/trackclick-XXXXXX.rules"));
        tmp.setAutoRemove(false);
        if (!tmp.open())
            return InstallResult::TempFileFailed;
        tmp.write(ruleText.toUtf8());
        tmp.flush();
        tmpPath = tmp.fileName();
    }

    // Both paths are app-controlled: dest is a constant, tmpPath comes from our
    // own QTemporaryFile.  Keep it that way — see the header.
    const QString script = QStringLiteral(
        "cp '%1' '%2' && chmod 0644 '%2' && "
        "udevadm control --reload-rules && "
        "udevadm trigger --subsystem-match=input --action=change")
        .arg(tmpPath, ruleDestinationPath());

    QProcess proc;
    proc.start(QStringLiteral("pkexec"), {QStringLiteral("/bin/sh"),
                                          QStringLiteral("-c"), script});
    const bool started = proc.waitForStarted(5000);
    bool finished = false;
    if (started)
        finished = proc.waitForFinished(120000);  // allow time at the password prompt

    QFile::remove(tmpPath);

    if (!started)
        return InstallResult::HelperMissing;
    if (finished && proc.exitStatus() == QProcess::NormalExit && proc.exitCode() == 0)
        return InstallResult::Installed;
    return InstallResult::Refused;
}