feat: add plasma-face-unlock

src/daemon/system.cpp

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "system.h"
+
+#include <QDBusConnection>
+#include <QDBusInterface>
+#include <QDir>
+#include <QFile>
+
+#include <pwd.h>
+#include <unistd.h>
+
+#include <vector>
+
+namespace System
+{
+std::optional<uid_t> uidOf(const QString &user)
+{
+    if (user.isEmpty()) {
+        return std::nullopt;
+    }
+    std::vector<char> buf(16384);
+    passwd pw{};
+    passwd *result = nullptr;
+    if (getpwnam_r(user.toLocal8Bit().constData(), &pw, buf.data(), buf.size(), &result) != 0 || !result) {
+        return std::nullopt;
+    }
+    return result->pw_uid;
+}
+
+QString nameOf(uid_t uid)
+{
+    std::vector<char> buf(16384);
+    passwd pw{};
+    passwd *result = nullptr;
+    if (getpwuid_r(uid, &pw, buf.data(), buf.size(), &result) != 0 || !result) {
+        return QString::number(uid);
+    }
+    return QString::fromLocal8Bit(result->pw_name);
+}
+
+bool lidClosed()
+{
+    QDBusInterface logind(QStringLiteral("org.freedesktop.login1"),
+                          QStringLiteral("/org/freedesktop/login1"),
+                          QStringLiteral("org.freedesktop.login1.Manager"),
+                          QDBusConnection::systemBus());
+    if (logind.isValid()) {
+        const QVariant v = logind.property("LidClosed");
+        if (v.isValid()) {
+            return v.toBool();
+        }
+    }
+
+    const QDir lids(QStringLiteral("/proc/acpi/button/lid"));
+    for (const QString &lid : lids.entryList(QDir::Dirs | QDir::NoDotAndDotDot)) {
+        QFile state(lids.filePath(lid + QStringLiteral("/state")));
+        if (state.open(QIODevice::ReadOnly) && state.readAll().contains("closed")) {
+            return true;
+        }
+    }
+    return false;
+}
+
+quint64 processStartTime(pid_t pid)
+{
+    QFile stat(QStringLiteral("/proc/%1/stat").arg(pid));
+    if (!stat.open(QIODevice::ReadOnly)) {
+        return 0;
+    }
+    const QByteArray line = stat.readAll();
+    // The second field is the command name in brackets and can contain
+    // spaces and brackets of its own. Everything after the last ')' is
+    // plain numbers; the start time is the 20th of them.
+    const qsizetype close = line.lastIndexOf(')');
+    if (close < 0) {
+        return 0;
+    }
+    const QList<QByteArray> fields = line.mid(close + 2).split(' ');
+    return fields.size() > 19 ? fields.at(19).toULongLong() : 0;
+}
+} // namespace System