Is there a way to determine if a mount is a network file system?

l3u_

Hi all :-)

I'm trying to determine if some directory is a network file system or not. On Linux, this seems to be possible via QStorageInfo. If I go through QStorageInfo::mountedVolumes(), I can check fileSystemType(). So I e. g. get "nfs4", "cifs" or "fuse.sshfs" for network mounts.

On Windows however, for a Samba share, I get "NTFS", as if the share was a normal local file system.

So, when on Windows, I can't use this to know if it's a local or a remote file system. Is there any way to ascertain this cross-platform?

Thanks for all help!

l3u_

Okay, meanwhile I can write something here myself. In my feature request about this at https://bugreports.qt.io/browse/QTBUG-83321 , some approach emerged that at least fits my needs: Using QStorageInfo::device(), one can find out if a mount is using a physical device or something else (like a Samba share or whatever.)

This can be checked using the following enum:

enum DeviceType {
    Physical,
    Other,
    Unknown
};

and the following function:

DeviceType deviceType(const QStorageInfo &volume) const
{
#ifdef Q_OS_LINUX
    if (QString::fromLatin1(volume.device()).startsWith(QLatin1String("/"))) {
        return DeviceType::Physical;
    } else {
        return DeviceType::Other;
    }
#endif
#ifdef Q_OS_WIN
    if (QString::fromLatin1(volume.device()).startsWith(QLatin1String("\\\\?\\Volume"))) {
        return DeviceType::Physical;
    } else {
        return DeviceType::Other;
    }
#endif
#ifdef Q_OS_MACOS
    if (! QString::fromLatin1(volume.device()).startsWith(QLatin1String("//"))) {
        return DeviceType::Physical;
    } else {
        return DeviceType::Other;
    }
#endif
    return DeviceType::Unknown;
}

This reliably works for me on Linux, Windows and macOS.