k-filter -- for when kubectl talks too much

k-filter

#!/usr/bin/env bash

set -e
set -u
set -o pipefail

declare -rA FILTERS=(
  # Remove some mostly unintersting fields
  ['klean']='
    del( .. | .metadata?
      | .managedFields? , .uid? , .selfLink? , .resourceVersion? , .generation?
    )
  '
  # Make secrets readable by base64 decoding them
  ['sekret']='
    walk(
      if (type=="object" and .kind=="Secret" and (.data | type=="object"))
      then
        .data |= map_values(@base64d)
      else
        .
      end
    )
  '
)

nope() {
  printf 'Cannot be called as %q because no such filter exists\n' "$1"
  echo
  echo   'Available filters:'
  printf '  - %q\n' "${!FILTERS[@]}"
  echo
  echo   'Example call:'
  printf '  kubectl get secrets -o yaml | %q\n' "$1"
}

main() {
  local mode
  mode="$( basename "$0" )"

  [ "${FILTERS[$mode]+something}" ] || {
    nope "$mode" >&2
    return 1
  }

  yq -y "${FILTERS[$mode]}"
}

main "$@"

k-filter README

k-filter -- some filters for kubectl when it talks too much or grabage

0. Needs jq & yq on the system
      jq: https://stedolan.github.io/jq/ (apt install jq)
      yq: https://pypi.org/project/yq/   (pip3 install yq)

1. create links
      ln -s k-filter klean
      ln -s k-filter sekret

2. run it in a pipeline
      kubectl get secrets -o yaml | klean | sekret