local log_dir="$1"
local env="$2"
+ # Sleep a random 10 second interval to workaround tox sdist
+ # conflicts due to building in the same dist directory.
+ sleep $[ ( $RANDOM % 10 ) + 1 ]s
+
echo "-----> Running tox $env"
if ! tox -e $env > "$log_dir/tox-$env.log"; then
echo "$env" >> "$log_dir/failed-envs.log"