Work around premature disposing of PackageRegistryBackends

With ucbhelper::Content now requiring an XComponentContext during construction,
calling "unopkg add" with an .oxt that requires license acceptance would lead to
an assertion about a null XComponentContext, as doChecksForAddExtension calls
the XPackage's checkPrerequisites -> checkLicnese -> getTextFromURL, which
creates an ucbhelper::Content with getMyBackend()->getComponentContext(), but
early release of the "tmp" manager would already have caused disposing of that
backend, which clears m_xComponentContext.

I assume this problem had always been lurking silently in the code.

Change-Id: I9f59c612fe3831b2f6dd832ef2f0505b6590b8e0

desktop/source/deployment/manager/dp_extensionmanager.cxx

@@ -655,8 +655,22 @@ Reference<deploy::XPackage> ExtensionManager::addExtension(
     //would remove the first one.
     ::osl::MutexGuard addGuard(m_addMutex);
 
-    Reference<deploy::XPackage> xTmpExtension =
-        getTempExtension(url, xAbortChannel, xCmdEnv);
+    Reference<deploy::XPackageManager> xTmpRepository(getTmpRepository());
+        // make sure xTmpRepository is alive as long as xTmpExtension is; as
+        // the "tmp" manager is only held weakly by m_xPackageManagerFactory, it
+        // could otherwise be disposed early, which would in turn dispose
+        // xTmpExtension's PackageRegistryBackend behind its back
+    Reference<deploy::XPackage> xTmpExtension(
+        xTmpRepository->addPackage(
+            url, uno::Sequence<beans::NamedValue>(), OUString(), xAbortChannel,
+            new TmpRepositoryCommandEnv()));
+    if (!xTmpExtension.is()) {
+        throw deploy::DeploymentException(
+            ("Extension Manager: Failed to create temporary XPackage for url: "
+             + url),
+            static_cast<OWeakObject*>(this), uno::Any());
+    }
+
     //Make sure the extension is removed from the tmp repository in case
     //of an exception
     ExtensionRemoveGuard tmpExtensionRemoveGuard(xTmpExtension, getTmpRepository());
@@ -1404,25 +1418,6 @@ void ExtensionManager::checkUpdate(
             static_cast<OWeakObject *>(this), request );
 }
 
-Reference<deploy::XPackage> ExtensionManager::getTempExtension(
-    OUString const & url,
-    Reference<task::XAbortChannel> const & xAbortChannel,
-    Reference<ucb::XCommandEnvironment> const & /*xCmdEnv*/)
-
-{
-    Reference<ucb::XCommandEnvironment> tmpCmdEnvA(new TmpRepositoryCommandEnv());
-    Reference<deploy::XPackage> xTmpPackage = getTmpRepository()->addPackage(
-        url, uno::Sequence<beans::NamedValue>(),OUString(), xAbortChannel, tmpCmdEnvA);
-    if (!xTmpPackage.is())
-    {
-        throw deploy::DeploymentException(
-            OUSTR("Extension Manager: Failed to create temporary XPackage for url: ") + url,
-            static_cast<OWeakObject*>(this), uno::Any());
-
-    }
-    return xTmpPackage;
-}
-
 uno::Sequence<Reference<deploy::XPackage> > SAL_CALL
 ExtensionManager::getExtensionsWithUnacceptedLicenses(
         OUString const & repository,

desktop/source/deployment/manager/dp_extensionmanager.hxx

@@ -280,11 +280,6 @@ private:
         css::uno::Reference<css::deployment::XPackage> const & oldExtension,
         css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv);
 
-    css::uno::Reference<css::deployment::XPackage> getTempExtension(
-        ::rtl::OUString const & url,
-        css::uno::Reference<css::task::XAbortChannel> const & xAbortChannel,
-        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv);
-
     void addExtensionsToMap(
         id2extensions & mapExt,
         css::uno::Sequence<css::uno::Reference<css::deployment::XPackage> > const & seqExt,