added kubernetes_yaml_strip_live_fields.sh

kubernetes/kubernetes_yaml_strip_live_fields.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+#  vim:ts=4:sts=4:sw=4:et
+#
+#  Author: Hari Sekhon
+#  Date: 2024-12-18 23:49:51 +0700 (Wed, 18 Dec 2024)
+#
+#  https///github.com/HariSekhon/DevOps-Bash-tools
+#
+#  License: see accompanying Hari Sekhon LICENSE file
+#
+#  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
+#
+#  https://www.linkedin.com/in/HariSekhon
+#
+
+set -euo pipefail
+[ -n "${DEBUG:-}" ] && set -x
+srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# shellcheck disable=SC1090,SC1091
+. "$srcdir/lib/utils.sh"
+
+# shellcheck disable=SC2034,SC2154
+usage_description="
+Strips live fields from Kubernetes yaml objects
+
+Useful so you can do 'kubectl diff' or 'kubectl apply' without hitting annoying errors about immutable fields
+left in exports from 'kubectl get ... -o yaml'
+
+Reads from files or standard input and outputs to standard output like a standard unix filter program for shell piping
+
+
+Immutable fields removed:
+
+    - metadata.creationTimestamp,
+    - metadata.uid,
+    - metadata.resourceVersion,
+    - metadata.selfLink,
+    - metadata.generation,
+    - status,
+    - spec.clusterIP,
+    - spec.loadBalancerIP,
+    - spec.template.metadata.creationTimestamp
+"
+#- metadata.annotations (optional toggle with --strip-annotations)
+
+# used by usage() in lib/utils.sh
+# shellcheck disable=SC2034
+usage_args="[<files>]"
+
+help_usage "$@"
+
+#min_args 1 "$@"
+
+strip_yaml(){
+	yq eval \
+		'del(
+		  .metadata.creationTimestamp,
+		  .metadata.uid,
+		  .metadata.resourceVersion,
+		  .metadata.selfLink,
+		  .metadata.generation,
+		  .status,
+		  .spec.clusterIP,
+		  .spec.loadBalancerIP,
+		  .spec.template.metadata.creationTimestamp
+		)' -
+}
+
+if [ $# -eq 0 ]; then
+    log "Reading from standard input"
+	cat "$@" | strip_yaml
+else
+	for file; do
+        strip_yaml < "$file"
+    done
+fi