Sanity checks

build-singularity-image.sh

@@ -3,9 +3,12 @@
 thisScript=$(basename $0)
 
 #
-# Name of the Docker image which contains Singularity
+# Ensure the Docker image which contains Singularity exists
 #
 dockerImageName='airnandez/singularity:3.8.3'
+if ! docker image ls | grep -e "^$(echo ${dockerImageName} | sed 's/:.*//g')" &> /dev/null; then
+   echo "${thisScript}: could not find Docker image ${dockerImageName}"
+fi
 
 #
 # Name of the Singularity definition file