shellhelpers.cpp - mozsearch

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// Copyright (C) 2026 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "shellhelpers.h"

QT_BEGIN_NAMESPACE

using namespace Qt::StringLiterals;

void forceStopBundle(const Hdc &hdc, const QString &bundleName)

    hdc.shell({ u"aa"_s, u"force-stop"_s, bundleName });

bool isProcessAlive(const Hdc &hdc, const QString &bundleName)

    return !hdc.shell({u"pidof"_s, bundleName}).trimmed().isEmpty();

// wc -c + tail -c +N runs device-side; both use plain read() syscalls (SELinux

// permits, unlike inotify), and one persistent hdc connection avoids per-poll

// reconnect overhead.

std::unique_ptr<QProcess> streamDeviceFileWhileAppRuns(

    const Hdc &hdc, const QString &devicePath, const QString &bundleName)

    static constexpr int startTimeoutMs = 5000;

    const QString followFileFromStart = u"sz=0; f='"_s + devicePath + u"';"_s;

    const QString definePrintNewBytes =

        u" dump() { new=$(wc -c < \"$f\" 2>/dev/null);"

         " if [ \"${new:-0}\" -gt \"$sz\" ]; then"

         " tail -c +$((sz+1)) \"$f\" 2>/dev/null | head -c $((new-sz)); sz=$new; fi; };"_s;

    const QString printNewBytesUntilAppExits =

        u" while true; do dump;"

         " pidof "_s + bundleName + u" >/dev/null 2>&1 || { dump; break; };"

         " sleep 0.1; done"_s;

    const QString streamUntilAppExits =

        followFileFromStart + definePrintNewBytes + printNewBytesUntilAppExits;

    auto process = std::make_unique<QProcess>();

    // SeparateChannels so we can scan stdout for PASS/FAIL while forwarding it.

    process->setProcessChannelMode(QProcess::SeparateChannels);

    process->start(hdc.program(), hdc.shellArguments({streamUntilAppExits}));

    if (!process->waitForStarted(startTimeoutMs))

        return {};

    return process;

QString readDeviceFile(const Hdc &hdc, const QString &devicePath)

    return hdc.shell({ u"cat"_s, devicePath });

QT_END_NAMESPACE