commit 8e74a617df7d53732c1ef395a97479ce58122731
Author: Riccardo Pittau <elfosardo@gmail.com>
Date:   Fri Apr 10 10:48:15 2020 +0200

    Move supported distros to variable
    
    Improve redability of the distro check using a variable to
    store supported distributions.
    
    Change-Id: Iffa1619065358d459bd04523b7eeae9049f8f2f0

diff --git a/stack.sh b/stack.sh
index 3b2a331..bb4dfa2 100755
--- a/stack.sh
+++ b/stack.sh
@@ -221,7 +221,9 @@ write_devstack_version
 
 # Warn users who aren't on an explicitly supported distro, but allow them to
 # override check and attempt installation with ``FORCE=yes ./stack``
-if [[ ! ${DISTRO} =~ (bionic|focal|f31|f32|opensuse-15.2|opensuse-tumbleweed|rhel8) ]]; then
+SUPPORTED_DISTROS="bionic|focal|f31|f32|opensuse-15.2|opensuse-tumbleweed|rhel8"
+
+if [[ ! ${DISTRO} =~ $SUPPORTED_DISTROS ]]; then
     echo "WARNING: this script has not been tested on $DISTRO"
     if [[ "$FORCE" != "yes" ]]; then
         die $LINENO "If you wish to run this script anyway run with FORCE=yes"