A CLI for managing declarative infrastructure.
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airshipctl/tools/airship-in-a-pod/base/wait_for

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#!/bin/bash
# wait_for takes a container name and runs until the named container has
# reported a "SUCCESS" or "FAILURE" status in the "/tmp/status" directory.
# When the status becomes "SUCCESS" or "FAILURE", the `wait_for` script exits
# with a corresponding exit code. It can be used to prevent a container from
# executing until pre-requisite containers have indicated successful
# completion.
container="$1"
mkdir -p "/tmp/status"
status_file="/tmp/status/$container"
if [[ ! -e "$status_file" ]]; then
# Create the status file to prevent errors when checking its contents
touch "$status_file"
fi
while true; do
# Assume we're finished, prove otherwise
finished=true
for container in "$@"; do
if (! grep -q -e "SUCCESS" -e "FAILURE" "$status_file"); then
printf "Waiting on status from '%s'...\n" "$container"
finished=false
sleep 10
break
fi
done
if $finished; then
break
fi
done
if (grep -q "SUCCESS" "$status_file"); then
exit 0
else
exit 1
fi