rungketest.sh

#!/bin/bash

#
# Posting this as an example of a bash script I never should have written: 
#
# it runs inside of a CI pipeline, waits for a kubernetes job to complete, looping
# until kubectl reports the job finishing, either success or fail.
#
# The problem: parsing the output frm kubectl is something I've used in a bunch of scripts,
# including exec'ing a shell, killing a pod, listing pods...
#
# So now I have repeated bash code in many shell scripts, all called by a Makefile.
#
# Parsing kubectl output should be in a function, which can be shared among multiple
# scripts/tasks.  
#
# Someday, all those scripts I wrote should all be combined into one 
# Planck/Lumo Clojure program.
#

# exit at first exit error (-e)
#   -u: exit if you reference non-existent variable
set -eu


kubectl delete -f booktracker-job.yaml || true

kubectl create -f booktracker-job.yaml

sleep 5

# logs -f will never exit
# wait until pod is up
POD="abc"
while [[ "$POD" != "booktracker-test-job"* ]]; do
    POD=`kubectl get pods| grep booktracker-test-job | sed 's/ .*//'`
    echo $POD
    sleep 5
done

echo Running tests in GKE: to view logs: 
echo     kubectl logs $POD booktracker -f


LOGGING="no"
STATE="abc"
while [ "$STATE" != "Error" ] && [ "$STATE" !=  "Completed" ] ; do
    # returns
    # NAME               DESIRED   SUCCESSFUL   AGE
    # booktracker-test   1         1            4m
    # booktracker-test   1         0            15m

    # kubectl get jobs

    if [ "$LOGGING" == "no" ] ; then
        kubectl logs $POD booktracker -f &
        LOGGING="yes"
    fi

    OUT=`kubectl get pods -a | grep booktracker-test-job`
    STATE=`echo $OUT | awk '{print $3}'`
    echo $OUT
    echo $STATE

    # NAME                           READY     STATUS      RESTARTS   AGE
    # booktracker-test-9mcf6         2/2       Running     0          <invalid>
    # booktracker-test-qkgbt         0/2       Error       0          15m
    # booktracker-test-cpfnt         0/2       Completed   0          4m
    sleep 5
done

echo "Outputting logs..."
kubectl logs $POD booktracker

case $STATE in
"Completed")
    echo "Kubernetes job completed successfully!"
    exit 0
    ;;
"Error")
    echo "Kubernetes job FAIILED!!"
    exit 1
    ;;
esac