kube-list-all-images

#!/bin/bash

# Copyright 2019 Dmitri Rubinstein
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -eo pipefail

export LC_ALL=C
unset CDPATH

THIS_DIR=$( (cd "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P))

# shellcheck source=kube-shlib.sh
source "$THIS_DIR/kube-shlib.sh"

define-kubectl-funcs

KOPTS=()

usage() {
    echo "Get the list of all images running in pods in the Kubernetes cluster."
    echo ""
    echo "$(basename "$0") [options]"
    echo ""
    echo "environment variables:"
    echo "  KUBECTL                    Name of the kubectl command to use"
    echo "  KUBECTL_BIN                Full path to the kubectl binary. This variable has precedence over KUBECTL"
    echo "  KUBE_CONTEXT               The name of the kubeconfig context to use"
    echo "  KUBECTL_OPTS               Additional options for kubectl"
    echo "options:"
    echo "  -A, --all-namespaces       If present, list the requested object(s) across all namespaces."
    echo "                             Namespace in current context is ignored even if specified with --namespace."
    echo "  -c, --context              The name of the kubeconfig context to use."
    echo "      --help                 Display this help and exit"
    echo "      --                     End of options"
}

while [[ $# -gt 0 ]]; do
    case "$1" in
    -c | --context)
        KUBE_CONTEXT="$2"
        shift 2
        ;;
    --context=*)
        KUBE_CONTEXT="${1#*=}"
        shift
        ;;
    -A | --all-namespaces)
        KOPTS+=("$1")
        shift
        ;;
    --help)
        usage
        exit
        ;;
    --)
        shift
        break
        ;;
    -*)
        fatal "Unknown option $1"
        ;;
    *)
        break
        ;;
    esac
done

run-kubectl-ctx get pods "${KOPTS[@]}" \
    -o jsonpath='{.items[*].status.containerStatuses[*].image}{"\n"}'