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49 lines
1.2 KiB
Bash
49 lines
1.2 KiB
Bash
5 years ago
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#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2019-11-21 16:02:54 +0000 (Thu, 21 Nov 2019)
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#
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# https://github.com/harisekhon/bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/harisekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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usage(){
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echo "
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Waits and watches GCE Metadata API for the preemption trigger before continuing to execute it's arguments
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Alternative to shutdown scripts if you want to interactively set up a CLI trigger on pre-emption
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https://cloud.google.com/compute/docs/shutdownscript
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${0##*/} <commands>
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"
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exit 3
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}
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if [[ "${1:-}" =~ -.* ]]; then
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usage
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fi
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output="$(curl -s -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/preempted?wait_for_change=true")"
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# shellcheck disable=SC2181
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if [ $? -eq 0 ]; then
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if grep -q TRUE <<< "$output"; then
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eval "$@"
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else
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echo "not preempted, skipping commands"
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exit 1
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fi
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else
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echo "FAILED to query GCE Metadata API, not running inside GCE?"
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exit 2
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fi
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