Wait until a condition is met in bash script

Question

until [ $(aws ssm get-automation-execution --automation-execution-id "$id" --query 'AutomationExecution.AutomationExecutionStatus' --output text) = *"InProgress"* ];
do
  echo "Automation is running......"
  sleep 1m
done
status=$(aws ssm get-automation-execution --automation-execution-id "$id" --query 'AutomationExecution.AutomationExecutionStatus' --output text)
if [ "$status" == "Success" ]; then
    echo "Automation $status"
elif [ "$status" == "Failed" -o "$status" == "Cancelled" -o "$status" == "Timed Out" ]; then
    echo "Automation $status"
fi

here the loop is never exiting, it keeps printing "Automation is running......" even after automation has been executed and status is not inprogress what i want to do is wait until status is " inprogress", print "Automation is running......" on screen. once its finished, i want to print the status of automation on screen if it failed or succeeded.

Shouldn't it be the other way around, while instead of until? You might never see that string if the command finishes fast, and you want to wait while it runs, not until it does. — Benjamin W.
– Benjamin W., Commented Aug 22, 2018 at 21:05
i tried changing until with while but still the loop doesn't exit. i am unable to understand how to write this loop. — chandra
– chandra, Commented Aug 23, 2018 at 2:31

chandra · Accepted Answer · 2018-08-24 20:32:36Z

9

adding an if else until helped me get out of the loop.

until [ $(aws ssm get-automation-execution --automation-execution-id "$id" --query 'AutomationExecution.AutomationExecutionStatus' --output text) = *"InProgress"* ];
do
  echo "Automation is running......"
  sleep 10s
  if [ $(aws ssm get-automation-execution --automation-execution-id "$id" --query 'AutomationExecution.AutomationExecutionStatus' --output text) != "InProgress" ]; then
     echo "Automation Finished"
     status=$(aws ssm get-automation-execution --automation-execution-id "$id" --query 'AutomationExecution.AutomationExecutionStatus' --output text)
     echo "Automation $status"
     if [$status != "Success"]; then
        exit 3
        echo "Automation $status"
     fi   
    break
  fi
done

answered Aug 24, 2018 at 20:32

chandra

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Comments

Alon G · Accepted Answer · 2022-01-12 11:10:00Z

6

This is a general function which I use:

function wait_for() {
    timeout=$1
    shift 1
    until [ $timeout -le 0 ] || ("$@" &> /dev/null); do
        echo waiting for "$@"
        sleep 1
        timeout=$(( timeout - 1 ))
    done
    if [ $timeout -le 0 ]; then
        return 1
    fi
}

You can have another function which checks the condition:

function is_still_running() {
    aws_status=$(aws ssm get-automation-execution --automation-execution-id "$id" --query 'AutomationExecution.AutomationExecutionStatus' --output text)
    if [ "${aws_status}" = *"InProgress"* ]; then
        return 0;
    else
        return 1;
    fi
}

then the usage would be:

wait_for 100 is_still_running

answered Jan 12, 2022 at 11:10

Alon G

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1 Comment

dhwang Over a year ago

This is very nice, probably make a slight change so it can read like: wait_for_job aws_run or_timeout

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