added kubectl_diff_apply.sh
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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: 2020-11-18 11:09:30 +0000 (Wed, 18 Nov 2020)
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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 "${DEBUG:-}" ] && set -x
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srcdir="$(dirname "${BASH_SOURCE[0]}")"
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# shellcheck disable=SC1090,SC1091
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. "$srcdir/lib/utils.sh"
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# shellcheck disable=SC1090
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# not using anything from here directly
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#. "$srcdir/lib/kubernetes.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Runs kubectl diff and apply, prompting to accept any changes before applying
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Must be given kubectl args to provide the input yaml(s), eg:
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${0##*/} -f file.yaml
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kustomize build | ${0##*/} -f -
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Highly recommended to specify --context to avoid race conditions in global kube config which could apply to the wrong cluster. See kubectl.sh for more details
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${0##*/} -f file.yaml --context=gke_...
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See Also:
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kustomize_diff_apply.sh - runs kustomize build, precreates namespaces, and then runs this diff and apply
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kubectl_create_namespaces.sh - creates any namespaces in the yaml inputs to allow an initial diff to succeed
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="<kubectl_options>"
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help_usage "$@"
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stdin=0
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yaml=""
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# there is no space before -f in $* if given as first argument
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#if [[ "$*" =~ [[:space:]]-f[[:space:]]*- ]]; then
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if [[ "$*" =~ -f[[:space:]]*- ]]; then
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stdin=1
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fi
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if [ $stdin -eq 1 ]; then
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yaml="$(cat)"
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fi
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echo "Diff from live running cluster:"
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echo
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if kubectl diff "$@" <<< "$yaml"; then
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echo "No changes to deploy"
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exit 0
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fi
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echo
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read -r -p "Deploy the above changes? (y/N) " answer < /dev/tty
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shopt -s nocasematch
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if [[ ! "$answer" =~ ^y|yes$ ]]; then
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echo "Aborting..."
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exit 1
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fi
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shopt -u nocasematch
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echo
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echo
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kubectl apply "$@" <<< "$yaml"
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