if zone = 1, set us-central-a manually

Author: stellaning1120

wdl/tasks/Utility/Utils.wdl

@@ -1684,11 +1684,14 @@ task RandomZoneSpewer {
     command <<<
         set -eux
 
-        # by no means a perfect solution, but that's not desired anyway
         all_known_zones=("us-central1-a" "us-central1-b" "us-central1-c" "us-central1-f" "us-east1-b" "us-east1-c" "us-east1-d" "us-east4-a" "us-east4-b" "us-east4-c" "us-west1-a" "us-west1-b" "us-west1-c" "us-west2-a" "us-west2-b" "us-west2-c" "us-west3-a" "us-west3-b" "us-west3-c" "us-west4-a" "us-west4-b" "us-west4-c")
-        for zone in "${all_known_zones[@]}"; do echo "${zone}" >> zones.txt; done
 
-        shuf zones.txt | head -n ~{num_of_zones} | tr '\n' ' ' > "result.txt"
+        if [[ ~{num_of_zones} -eq 1 ]]; then
+            echo "us-central1-a" > result.txt
+        else
+            for zone in "${all_known_zones[@]}"; do echo "${zone}" >> zones.txt; done
+            shuf zones.txt | head -n ~{num_of_zones} | tr '\n' ' ' > result.txt
+        fi
     >>>
 
     output {