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Ubuntu OS应用Runtime Enviroment

news 来源：原创 2024/4/29 1:32:47

在这篇文章中。我们将介绍Ubuntu OS的Runtime Environment。在文章“App confinement: Security policy for click packages”中，我们看见它里面有介绍一个应用的runtime环境。这里，我们通过一个样例来显示一个应用的runtime环境究竟是如何的。

在这里我们能够參阅我曾经的文章“在Ubuntu上的C++及QML混合编程”，我们下载文章中的例程：

bzr branch lp:~liu-xiao-guo/debiantrial/readenv

在一个Terminal中打入上述的句子，就能够下载例程中的软件。

同一时候，我们对我们的主程序文件“ReadEnv.qml”做例如以下的改动：

import QtQuick 2.0
import Ubuntu.Components 0.1
import Ubuntu.Components.ListItems 0.1 as ListItem
import ReadEnv 1.0
import "ui"

/*!
    \brief MainView with Tabs element.
           First Tab has a single Label and
           second Tab has a single ToolbarAction.
*/

MainView {
    id: root

    // objectName for functional testing purposes (autopilot-qt5)
    objectName: "mainView"

    // Note! applicationName needs to match the "name" field of the click manifest
    applicationName: "com.ubuntu.developer.liu-xiao-guo.ReadEnv"

    anchorToKeyboard: true

    /*
     This property enables the application to change orientation
     when the device is rotated. The default is false.
    */
    //automaticOrientation: true

    width: units.gu(50)
    height: units.gu(75)

    property string app_pkgname

    ReadEnv {
        id: readEnv
    }

    Flickable {
        id: scrollWidget
        anchors.fill: parent
        contentHeight: contentItem.childrenRect.height
        boundsBehavior: (contentHeight > root.height) ?

Flickable.DragAndOvershootBounds : Flickable.StopAtBounds /* Set the direction to workaround https://bugreports.qt-project.org/browse/QTBUG-31905 otherwise the UI might end up in a situation where scrolling doesn't work */ flickableDirection: Flickable.VerticalFlick Column { anchors.left: parent.left anchors.right: parent.right ListItem.Base { height: ubuntuLabel.height + runtime.height + units.gu(6) Column { anchors.left: parent.left anchors.right: parent.right anchors.centerIn: parent spacing: units.gu(2) Label { id: ubuntuLabel anchors.horizontalCenter: parent.horizontalCenter text: "" fontSize: "x-large" } Label { id: runtime anchors.horizontalCenter: parent.horizontalCenter text: "Runtime Environment" } } } ListItem.Subtitled { text: i18n.tr("UBUNTU_APPLICATION_ISOLATION") subText: readEnv.getenv("UBUNTU_APPLICATION_ISOLATION") } ListItem.Subtitled { text: i18n.tr("APP_ID") subText: readEnv.getenv("APP_ID") } ListItem.Subtitled { text: i18n.tr("XDG_CACHE_HOME") subText: readEnv.getenv("XDG_CACHE_HOME") } ListItem.Subtitled { text: i18n.tr("XDG_CONFIG_HOME") subText: readEnv.getenv("XDG_CONFIG_HOME") } ListItem.Subtitled { text: i18n.tr("XDG_DATA_HOME") subText: readEnv.getenv("XDG_DATA_HOME") } ListItem.Subtitled { text: i18n.tr("XDG_RUNTIME_DIR") subText: readEnv.getenv("XDG_RUNTIME_DIR") } ListItem.Subtitled { text: i18n.tr("TMPDIR") subText: readEnv.getenv("TMPDIR") } ListItem.Subtitled { text: i18n.tr("PWD") subText: readEnv.getenv("PWD") } ListItem.Subtitled { text: i18n.tr("APP_PKGNAME") subText: app_pkgname } ListItem.Subtitled { text: i18n.tr("PATH") subText: readEnv.getenv("PATH") } ListItem.Subtitled { text: i18n.tr("LD_LIBRARY_PATH") subText: readEnv.getenv("LD_LIBRARY_PATH") } ListItem.Subtitled { text: i18n.tr("QML2_IMPORT_PATH") subText: readEnv.getenv("QML2_IMPORT_PATH") } } } Component.onCompleted: { var APP_ID = readEnv.getenv("APP_ID"); console.log("APP_ID: " + APP_ID ); app_pkgname = APP_ID.split('_')[0] console.log("APP_PKGNAME: " + app_pkgname); } }

我们能够通过我们设计的ReadEnv库来读取该应用的环境变量。

执行我们的程序。显演示样例如以下：