add kubectx/kubens
parent
87bf89dedd
commit
419db2b947
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#!/usr/bin/env bash
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#
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# kubectx(1) is a utility to manage and switch between kubectl contexts.
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# Copyright 2017 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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[[ -n $DEBUG ]] && set -x
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set -eou pipefail
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IFS=$'\n\t'
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SELF_CMD="$0"
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KUBECTX="${XDG_CACHE_HOME:-$HOME/.kube}/kubectx"
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usage() {
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cat <<"EOF"
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USAGE:
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kubectx : list the contexts
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kubectx <NAME> : switch to context <NAME>
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kubectx - : switch to the previous context
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kubectx <NEW_NAME>=<NAME> : rename context <NAME> to <NEW_NAME>
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kubectx <NEW_NAME>=. : rename current-context to <NEW_NAME>
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kubectx -d <NAME> [<NAME...>] : delete context <NAME> ('.' for current-context)
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(this command won't delete the user/cluster entry
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that is used by the context)
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kubectx -h,--help : show this message
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EOF
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}
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exit_err() {
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echo >&2 "${1}"
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exit 1
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}
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current_context() {
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$KUBECTL config view -o=jsonpath='{.current-context}'
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}
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get_contexts() {
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$KUBECTL config get-contexts -o=name | sort -n
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}
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list_contexts() {
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set -u pipefail
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local cur ctx_list
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cur="$(current_context)" || exit_err "error getting current context"
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ctx_list=$(get_contexts) || exit_err "error getting context list"
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local yellow darkbg normal
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yellow=$(tput setaf 3 || true)
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darkbg=$(tput setab 0 || true)
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normal=$(tput sgr0 || true)
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local cur_ctx_fg cur_ctx_bg
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cur_ctx_fg=${KUBECTX_CURRENT_FGCOLOR:-$yellow}
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cur_ctx_bg=${KUBECTX_CURRENT_BGCOLOR:-$darkbg}
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for c in $ctx_list; do
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if [[ -n "${_KUBECTX_FORCE_COLOR:-}" || \
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-t 1 && -z "${NO_COLOR:-}" ]]; then
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# colored output mode
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if [[ "${c}" = "${cur}" ]]; then
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echo "${cur_ctx_bg}${cur_ctx_fg}${c}${normal}"
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else
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echo "${c}"
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fi
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else
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echo "${c}"
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fi
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done
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}
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read_context() {
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if [[ -f "${KUBECTX}" ]]; then
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cat "${KUBECTX}"
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fi
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}
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save_context() {
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local saved
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saved="$(read_context)"
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if [[ "${saved}" != "${1}" ]]; then
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printf %s "${1}" > "${KUBECTX}"
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fi
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}
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switch_context() {
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$KUBECTL config use-context "${1}"
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}
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choose_context_interactive() {
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local choice
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choice="$(_KUBECTX_FORCE_COLOR=1 \
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FZF_DEFAULT_COMMAND="${SELF_CMD}" \
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fzf --ansi || true)"
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if [[ -z "${choice}" ]]; then
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echo 2>&1 "error: you did not choose any of the options"
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exit 1
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else
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set_context "${choice}"
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fi
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}
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set_context() {
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local prev
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prev="$(current_context)" || exit_err "error getting current context"
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switch_context "${1}"
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if [[ "${prev}" != "${1}" ]]; then
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save_context "${prev}"
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fi
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}
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swap_context() {
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local ctx
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ctx="$(read_context)"
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if [[ -z "${ctx}" ]]; then
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echo "error: No previous context found." >&2
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exit 1
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fi
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set_context "${ctx}"
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}
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context_exists() {
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grep -q ^"${1}"\$ <($KUBECTL config get-contexts -o=name)
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}
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rename_context() {
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local old_name="${1}"
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local new_name="${2}"
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if [[ "${old_name}" == "." ]]; then
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old_name="$(current_context)"
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fi
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if ! context_exists "${old_name}"; then
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echo "error: Context \"${old_name}\" not found, can't rename it." >&2
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exit 1
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fi
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if context_exists "${new_name}"; then
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echo "Context \"${new_name}\" exists, deleting..." >&2
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$KUBECTL config delete-context "${new_name}" 1>/dev/null 2>&1
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fi
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$KUBECTL config rename-context "${old_name}" "${new_name}"
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}
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delete_contexts() {
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for i in "${@}"; do
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delete_context "${i}"
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done
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}
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delete_context() {
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local ctx
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ctx="${1}"
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if [[ "${ctx}" == "." ]]; then
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ctx="$(current_context)" || exit_err "error getting current context"
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fi
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echo "Deleting context \"${ctx}\"..." >&2
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$KUBECTL config delete-context "${ctx}"
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}
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main() {
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if hash kubectl 2>/dev/null; then
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KUBECTL=kubectl
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elif hash kubectl.exe 2>/dev/null; then
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KUBECTL=kubectl.exe
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else
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echo >&2 "kubectl is not installed"
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exit 1
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fi
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if [[ "$#" -eq 0 ]]; then
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if [[ -t 1 && -z "${KUBECTX_IGNORE_FZF:-}" && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
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choose_context_interactive
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else
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list_contexts
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fi
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elif [[ "${1}" == "-d" ]]; then
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if [[ "$#" -lt 2 ]]; then
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echo "error: missing context NAME" >&2
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usage
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exit 1
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fi
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delete_contexts "${@:2}"
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elif [[ "$#" -gt 1 ]]; then
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echo "error: too many arguments" >&2
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usage
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exit 1
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elif [[ "$#" -eq 1 ]]; then
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if [[ "${1}" == "-" ]]; then
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swap_context
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elif [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
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usage
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elif [[ "${1}" =~ ^-(.*) ]]; then
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echo "error: unrecognized flag \"${1}\"" >&2
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usage
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exit 1
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elif [[ "${1}" =~ (.+)=(.+) ]]; then
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rename_context "${BASH_REMATCH[2]}" "${BASH_REMATCH[1]}"
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else
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set_context "${1}"
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fi
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else
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usage
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exit 1
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fi
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}
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main "$@"
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@ -0,0 +1,8 @@
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_kube_namespaces()
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{
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local curr_arg;
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curr_arg=${COMP_WORDS[COMP_CWORD]}
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COMPREPLY=( $(compgen -W "- $(kubectl get namespaces -o=jsonpath='{range .items[*].metadata.name}{@}{"\n"}{end}')" -- $curr_arg ) );
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}
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complete -F _kube_namespaces kubens kns
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@ -0,0 +1,214 @@
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#!/usr/bin/env bash
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#
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# kubens(1) is a utility to switch between Kubernetes namespaces.
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# Copyright 2017 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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[[ -n $DEBUG ]] && set -x
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set -eou pipefail
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IFS=$'\n\t'
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SELF_CMD="$0"
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KUBENS_DIR="${XDG_CACHE_HOME:-$HOME/.kube}/kubens"
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usage() {
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cat <<"EOF"
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USAGE:
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kubens : list the namespaces in the current context
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kubens <NAME> : change the active namespace of current context
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kubens - : switch to the previous namespace in this context
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kubens -h,--help : show this message
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EOF
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}
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exit_err() {
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echo >&2 "${1}"
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exit 1
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}
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current_namespace() {
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local cur_ctx
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cur_ctx="$(current_context)" || exit_err "error getting current context"
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ns="$($KUBECTL config view -o=jsonpath="{.contexts[?(@.name==\"${cur_ctx}\")].context.namespace}")" \
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|| exit_err "error getting current namespace"
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if [[ -z "${ns}" ]]; then
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echo "default"
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else
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echo "${ns}"
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fi
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}
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current_context() {
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$KUBECTL config current-context
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}
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get_namespaces() {
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$KUBECTL get namespaces -o=jsonpath='{range .items[*].metadata.name}{@}{"\n"}{end}'
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}
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escape_context_name() {
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echo "${1//\//-}"
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}
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namespace_file() {
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local ctx="$(escape_context_name "${1}")"
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echo "${KUBENS_DIR}/${ctx}"
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}
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read_namespace() {
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local f
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f="$(namespace_file "${1}")"
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[[ -f "${f}" ]] && cat "${f}"
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return 0
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}
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save_namespace() {
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mkdir -p "${KUBENS_DIR}"
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local f saved
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f="$(namespace_file "${1}")"
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saved="$(read_namespace "${1}")"
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if [[ "${saved}" != "${2}" ]]; then
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printf %s "${2}" > "${f}"
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fi
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}
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switch_namespace() {
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local ctx="${1}"
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$KUBECTL config set-context "${ctx}" --namespace="${2}"
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echo "Active namespace is \"${2}\".">&2
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}
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choose_namespace_interactive() {
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# directly calling kubens via fzf might fail with a cryptic error like
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# "$FZF_DEFAULT_COMMAND failed", so try to see if we can list namespaces
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# locally first
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if [[ -z "$(list_namespaces)" ]]; then
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echo >&2 "error: could not list namespaces (is the cluster accessible?)"
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exit 1
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fi
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local choice
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choice="$(_KUBECTX_FORCE_COLOR=1 \
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FZF_DEFAULT_COMMAND="${SELF_CMD}" \
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fzf --ansi || true)"
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if [[ -z "${choice}" ]]; then
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echo 2>&1 "error: you did not choose any of the options"
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exit 1
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else
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set_namespace "${choice}"
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fi
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}
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set_namespace() {
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local ctx prev
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ctx="$(current_context)" || exit_err "error getting current context"
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prev="$(current_namespace)" || exit_error "error getting current namespace"
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if grep -q ^"${1}"\$ <(get_namespaces); then
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switch_namespace "${ctx}" "${1}"
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if [[ "${prev}" != "${1}" ]]; then
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save_namespace "${ctx}" "${prev}"
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fi
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else
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echo "error: no namespace exists with name \"${1}\".">&2
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exit 1
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fi
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}
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list_namespaces() {
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local yellow darkbg normal
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yellow=$(tput setaf 3 || true)
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darkbg=$(tput setab 0 || true)
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normal=$(tput sgr0 || true)
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local cur_ctx_fg cur_ctx_bg
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cur_ctx_fg=${KUBECTX_CURRENT_FGCOLOR:-$yellow}
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cur_ctx_bg=${KUBECTX_CURRENT_BGCOLOR:-$darkbg}
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local cur ns_list
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cur="$(current_namespace)" || exit_err "error getting current namespace"
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ns_list=$(get_namespaces) || exit_err "error getting namespace list"
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for c in $ns_list; do
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if [[ -n "${_KUBECTX_FORCE_COLOR:-}" || \
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-t 1 && -z "${NO_COLOR:-}" ]]; then
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# colored output mode
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if [[ "${c}" = "${cur}" ]]; then
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echo "${cur_ctx_bg}${cur_ctx_fg}${c}${normal}"
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else
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echo "${c}"
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fi
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else
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echo "${c}"
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fi
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done
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}
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swap_namespace() {
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local ctx ns
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ctx="$(current_context)" || exit_err "error getting current context"
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ns="$(read_namespace "${ctx}")"
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if [[ -z "${ns}" ]]; then
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echo "error: No previous namespace found for current context." >&2
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exit 1
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fi
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set_namespace "${ns}"
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}
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main() {
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if [[ -z "${KUBECTL:-}" ]]; then
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if hash kubectl 2>/dev/null; then
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KUBECTL=kubectl
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elif hash kubectl.exe 2>/dev/null; then
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KUBECTL=kubectl.exe
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else
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echo >&2 "kubectl is not installed"
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exit 1
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fi
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fi
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if [[ "$#" -eq 0 ]]; then
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if [[ -t 1 && -z ${KUBECTX_IGNORE_FZF:-} && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
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choose_namespace_interactive
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else
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list_namespaces
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fi
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elif [[ "$#" -eq 1 ]]; then
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if [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
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usage
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elif [[ "${1}" == "-" ]]; then
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swap_namespace
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elif [[ "${1}" =~ ^-(.*) ]]; then
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echo "error: unrecognized flag \"${1}\"" >&2
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usage
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exit 1
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elif [[ "${1}" =~ (.+)=(.+) ]]; then
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alias_context "${BASH_REMATCH[2]}" "${BASH_REMATCH[1]}"
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else
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set_namespace "${1}"
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fi
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else
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echo "error: too many flags" >&2
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usage
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exit 1
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fi
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}
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main "$@"
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@ -0,0 +1,8 @@
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_kube_contexts()
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{
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local curr_arg;
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curr_arg=${COMP_WORDS[COMP_CWORD]}
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COMPREPLY=( $(compgen -W "- $(kubectl config get-contexts --output='name')" -- $curr_arg ) );
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}
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complete -F _kube_contexts kubectx kctx
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Reference in New Issue