Environment::Environment() {
// Set the Qt plugin directory
QStringList pluginPaths;
IString root = getEnvironmentValue("ISISROOT", "");
if (root != "") {
IString thirdPartyPluginPath = root + "/3rdParty/plugins";
pluginPaths << thirdPartyPluginPath.ToQt();
QCoreApplication::setLibraryPaths(pluginPaths);
}
#ifndef __APPLE__
// We need to force the correct QDBus library to be loaded... to do that, just
// use a symbol in it's library. This only applies to linux and fixes #1228.
// Long explanation:
// When we run GUI apps, the system (and Qt) work together to figure out
// which runtime libraries are necessary on-the-fly. When QApplication is
// instantiated, it goes into QtGui's style code. The styles ignore our plugin
// path setting (above) on all OS's. So Qt GUI grabs a style from the OS's styles,
// which is a shared library in the kde area. These styles require a version (any version)
// of QtDBus loaded. If QtDBus is not yet loaded, then the style library will grab it.
// However, on Ubuntu 12.04, the style library grabs the system (OS) QDBus library. QDBus
// detects that you've already loaded Isis' QtCore, so the library versions mismatch, and
// it crashes. The problem becomes more interesting because sometimes it picks up the system
// QDBus, and sometimes it picks up Isis' QDBus, and I have no good reason why we pick up
// one versus another; currently, installed apps pick up the system and locally built apps
// pick up Isis' (even when the executables are made to be identical). The end result is no
// installed GUI applications will run and our automated tests fail to catch it. This solution
// bypasses the entire issue by forcing QDBus to be loaded long before any styles are loaded,
// so the style plugins do not need to go and get their own QDBus library.
//
// The root cause is that Ubuntu's run time loader is failing to respect
// our executable's rpaths when loading a style library. However, when we link against the
// QBus library directly, we get the right one.
QDBusArgument();
#endif
}
static Object evalSymbol(Object self, Object env) {
return getEnvironmentValue(env, self);
}
/**
* @returns the host name. Returns 'Unknown' if it cannot find the host name.
*/
QString Environment::hostName() {
return getEnvironmentValue("HOST", "Unknown");
}
/**
* @Returns the user name. Returns 'Unknown' if it cannot find the user name.
*/
QString Environment::userName() {
return getEnvironmentValue("USER", "Unknown");
}