If a failure occurs early in the QemuBaseTest constructor, the 'log_filename' object atttribute may not exist yet. This happens most notably if the QEMU_TEST_QEMU_BINARY is not set. We can't initialize 'log_filename' earlier as we use the binary to identify the architecture which is then used to build the path in which the logs are stored. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20241121154218.1423005-19-berrange@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20241121165806.476008-19-alex.bennee@linaro.org>