Issue 1:
Today I was doing a composer update to go from Symfony 2.3.13 to Symfony 2.3.15 and since then I have been unable to run my application in my Vagrant environment.

The error I received is: MappingException: The mapping file /srv/shm/cache/dev/../../../vendor/symfony/symfony/src/Symfony/Component/Form/Resources/config/validation.xml does not exist

What apparently happened is that something, which I could not find, in Symfony had changed to generate relative paths in the cache instead of absolute paths.

However, to improve performance in vagrant we symlink the app/cache folder to /src/shm/cache in our virtual machine to reduce IO over vbox nfs. Having relative folders means now that it will try to find the vendor folder in my /srv/ folder.

Is this an unintended side-effect of another change? Is the above a supported use-case or should I find another way to improve performance in vagrant?

Here is the complete stacktrace (the name of the project has been replaced with dashes):

in /srv/http/---------/hosts/local.business.---------.nl/vendor/symfony/symfony/src/Symfony/Component/Validator/Mapping/Loader/FileLoader.php line 31
at FileLoader->__construct('/srv/shm/cache/dev/../../../vendor/symfony/symfony/src/Symfony/Component/Form/Resources/config/validation.xml') in /srv/http/---------/hosts/local.business.---------.nl/vendor/symfony/symfony/src/Symfony/Component/Validator/Mapping/Loader/XmlFilesLoader.php line 28
at XmlFilesLoader->getFileLoaderInstance('/srv/shm/cache/dev/../../../vendor/symfony/symfony/src/Symfony/Component/Form/Resources/config/validation.xml') in /srv/http/---------/hosts/local.business.---------.nl/vendor/symfony/symfony/src/Symfony/Component/Validator/Mapping/Loader/FilesLoader.php line 47
at FilesLoader->getFileLoaders(array('/srv/shm/cache/dev/../../../vendor/symfony/symfony/src/Symfony/Component/Form/Resources/config/validation.xml', '/srv/shm/cache/dev/../../../vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Resources/config/validation.xml')) in /srv/http/---------/hosts/local.business.---------.nl/vendor/symfony/symfony/src/Symfony/Component/Validator/Mapping/Loader/FilesLoader.php line 33
at FilesLoader->__construct(array('/srv/shm/cache/dev/../../../vendor/symfony/symfony/src/Symfony/Component/Form/Resources/config/validation.xml', '/srv/shm/cache/dev/../../../vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Resources/config/validation.xml')) in /srv/shm/cache/dev/appDevDebugProjectContainer.php line 4660
at appDevDebugProjectContainer->getValidator_Mapping_ClassMetadataFactoryService() in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 1974
at Container->get('validator.mapping.class_metadata_factory') in /srv/shm/cache/dev/appDevDebugProjectContainer.php line 4188
at appDevDebugProjectContainer->getValidatorService() in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 1974
at Container->get('validator') in /srv/shm/cache/dev/appDevDebugProjectContainer.php line 2497
at appDevDebugProjectContainer->getLuneticsLocale_Validator_MetaService() in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 1974
at Container->get('lunetics_locale.validator.meta') in /srv/shm/cache/dev/appDevDebugProjectContainer.php line 2400
at appDevDebugProjectContainer->getLuneticsLocale_QueryGuesserService() in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 1974
at Container->get('lunetics_locale.query_guesser') in /srv/shm/cache/dev/appDevDebugProjectContainer.php line 2312
at appDevDebugProjectContainer->getLuneticsLocale_GuesserManagerService() in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 1974
at Container->get('lunetics_locale.guesser_manager') in /srv/shm/cache/dev/appDevDebugProjectContainer.php line 2356
at appDevDebugProjectContainer->getLuneticsLocale_LocaleListenerService() in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 1974
at Container->get('lunetics_locale.locale_listener') in /srv/http/---------/hosts/local.business.---------.nl/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php line 188
at ContainerAwareEventDispatcher->lazyLoad('kernel.request') in /srv/http/---------/hosts/local.business.---------.nl/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php line 165
at ContainerAwareEventDispatcher->dispatch('kernel.request', object(GetResponseEvent)) in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 2878
at HttpKernel->handleRaw(object(Request), '1') in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 2863
at HttpKernel->handle(object(Request), '1', true) in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 2992
at ContainerAwareHttpKernel->handle(object(Request), '1', true) in /srv/http/---------/hosts/local.business.---------.nl/app/bootstrap.php.cache line 2247
at Kernel->handle(object(Request)) in /srv/http/---------/hosts/local.business.---------.nl/web/app_dev.php line 30

Issue 2:
In 2.3.14, 2.3.15, and 2.4.5, when I run php app/console generate:bundle I get the following prompt:

Target directory [/home/intrepion/path/app/cache/dev/../src]:

But when I revert back to 2.3.13 or 2.4.4, I get exactly what I expect:

Target directory [/home/intrepion/path/src]: