travis: don't ask for Ubuntu release on XOS

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/.travis-functions.sh b/.travis-functions.sh
index a90e8887d2b59ec1af1105091d9496b2ea438a2c..509e2a9258ffb6f1def1e2c9474aa3d13338fd53 100755 (executable)
--- a/.travis-functions.sh
+++ b/.travis-functions.sh
@@ -133,7 +133,7 @@ function check_dist
 
 function travis_install_script
 {
-       local ubuntu_release=$(lsb_release -cs)
+       local ubuntu_release
        local additional_packages=()
        local clang_version gcc_version
 
@@ -142,6 +142,8 @@ function travis_install_script
                return
        fi
 
+       ubuntu_release=$(lsb_release -cs)
+
        # install required packages
        sudo bash -c "echo 'deb-src http://archive.ubuntu.com/ubuntu/ $ubuntu_release main restricted universe multiverse' >>/etc/apt/sources.list"