RemoteLinux: Avoid unexpected password dialog in tests

Make the test depend on environment variables and give some
hint how to run the test correctly.
Beside this make the test work on Windows and share the setup
with ssh unit test.

Change-Id: I6bbf1ec863449512646ca2c51d13fec537beedbc
Reviewed-by: hjk <hjk@qt.io>

src/libs/ssh/sshconnection.cpp

@@ -403,4 +403,95 @@ SftpTransferPtr SshConnection::setupTransfer(
                                             d->connectionArgs(SshSettings::sftpFilePath())));
 }
 
+#ifdef WITH_TESTS
+namespace SshTest {
+const QString getHostFromEnvironment()
+{
+    const QString host = QString::fromLocal8Bit(qgetenv("QTC_SSH_TEST_HOST"));
+    if (host.isEmpty() && qEnvironmentVariableIsSet("QTC_SSH_TEST_DEFAULTS"))
+        return QString("127.0.0.1");
+    return host;
+}
+
+quint16 getPortFromEnvironment()
+{
+    const int port = qEnvironmentVariableIntValue("QTC_SSH_TEST_PORT");
+    return port != 0 ? quint16(port) : 22;
+}
+
+const QString getUserFromEnvironment()
+{
+    return QString::fromLocal8Bit(qgetenv("QTC_SSH_TEST_USER"));
+}
+
+const QString getKeyFileFromEnvironment()
+{
+    const FilePath defaultKeyFile = FileUtils::homePath() / ".ssh/id_rsa";
+    const QString keyFile = QString::fromLocal8Bit(qgetenv("QTC_SSH_TEST_KEYFILE"));
+    if (keyFile.isEmpty()) {
+        if (qEnvironmentVariableIsSet("QTC_SSH_TEST_DEFAULTS"))
+            return defaultKeyFile.toString();
+    }
+    return keyFile;
+}
+
+const QString userAtHost()
+{
+    QString userMidFix = getUserFromEnvironment();
+    if (!userMidFix.isEmpty())
+        userMidFix.append('@');
+    return userMidFix + getHostFromEnvironment();
+}
+
+SshConnectionParameters getParameters()
+{
+    SshConnectionParameters params;
+    if (!qEnvironmentVariableIsSet("QTC_SSH_TEST_DEFAULTS")) {
+        params.setUserName(getUserFromEnvironment());
+        params.privateKeyFile = Utils::FilePath::fromUserInput(getKeyFileFromEnvironment());
+    }
+    params.setHost(getHostFromEnvironment());
+    params.setPort(getPortFromEnvironment());
+    params.timeout = 10;
+    params.authenticationType = !params.privateKeyFile.isEmpty()
+            ? QSsh::SshConnectionParameters::AuthenticationTypeSpecificKey
+            : QSsh::SshConnectionParameters::AuthenticationTypeAll;
+    return params;
+}
+
+bool checkParameters(const QSsh::SshConnectionParameters &params)
+{
+    if (qEnvironmentVariableIsSet("QTC_SSH_TEST_DEFAULTS"))
+        return true;
+    if (params.host().isEmpty()) {
+        qWarning("No hostname provided. Set QTC_SSH_TEST_HOST.");
+        return false;
+    }
+    if (params.userName().isEmpty())
+        qWarning("No user name provided - test may fail with empty default. Set QTC_SSH_TEST_USER.");
+    if (params.privateKeyFile.isEmpty()) {
+        qWarning("No key file provided. Set QTC_SSH_TEST_KEYFILE.");
+        return false;
+    }
+    return true;
+}
+
+void printSetupHelp()
+{
+    qInfo() << "In order to run this test properly it requires some setup (example for fedora):\n"
+               "1. Run a server on the host to connect to:\n"
+               "   systemctl start sshd\n"
+               "2. Create your own ssh key (needed only once). For fedora it needs ecdsa type:\n"
+               "   ssh-keygen -t ecdsa\n"
+               "3. Make your public key known to the server (needed only once):\n"
+               "   ssh-copy-id -i [full path to your public key] [user@host]\n"
+               "4. Set the env variables before executing test:\n"
+               "   QTC_SSH_TEST_HOST=127.0.0.1\n"
+               "   QTC_SSH_TEST_KEYFILE=[full path to your private key]\n"
+               "   QTC_SSH_TEST_USER=[your user name]\n";
+}
+
+} // namespace SshTest
+#endif
+
 } // namespace QSsh