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kubens
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kubens
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#!/bin/bash
#
# kubenx(1) is a utility to switch between Kubernetes namespaces.
# Copyright 2017 Google Inc.
#
# 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.
[[ -n $DEBUG ]] && set -x
set -eou pipefail
IFS=$'\n\t'
SCRIPT_DIR="$(dirname "$( readlink -f "${0}" 2>/dev/null || \
python -c "import os,sys; print(os.path.realpath(sys.argv[1]))" "${0}" )")"
if [[ -f "${SCRIPT_DIR}/utils.bash" ]]; then
source "${SCRIPT_DIR}/utils.bash"
else
source "${SCRIPT_DIR}/../include/utils.bash"
fi
KUBENS_DIR="${HOME}/.kube/kubens"
usage() {
cat <<"EOF"
USAGE:
kubens : list the namespaces in the current context
kubens <NAME> : change the active namespace of current context
kubens - : switch to the previous namespace in this context
kubens -h,--help : show this message
EOF
exit 1
}
current_namespace() {
local cur_ctx=$(current_context)
ns="$(kubectl config view -o=jsonpath="{.contexts[?(@.name==\"${cur_ctx}\")].context.namespace}")"
if [[ -z "${ns}" ]]; then
echo "default"
else
echo "${ns}"
fi
}
namespace_file() {
local ctx="${1}"
echo "${KUBENS_DIR}/${ctx}"
}
read_namespace() {
local f="$(namespace_file "${1}")"
[[ -f "${f}" ]] && cat "${f}"
}
save_namespace() {
mkdir -p "${KUBENS_DIR}"
local f="$(namespace_file "${1}")"
local saved="$(read_namespace "${1}")"
if [[ "${saved}" != "${2}" ]]; then
printf %s "${2}" > "${f}"
fi
}
switch_namespace() {
local ctx="${1}"
kubectl config set-context "${ctx}" --namespace="${2}"
echo "Active namespace is \"${2}\".">&2
}
set_namespace() {
local ctx="$(current_context)"
local prev="$(current_namespace)"
if grep -q ^"${1}"\$ <(get_namespaces); then
switch_namespace "${ctx}" "${1}"
if [[ "${prev}" != "${1}" ]]; then
save_namespace "${ctx}" "${prev}"
fi
else
echo "error: no namespace exists with name \"${1}\".">&2
exit 1
fi
}
list_namespaces() {
local cur="$(current_namespace)"
local yellow=$(tput setaf 3)
local darkbg=$(tput setab 0)
local normal=$(tput sgr0)
for c in $(get_namespaces); do
if [[ "${c}" = "${cur}" ]]; then
echo "${darkbg}${yellow}${c}${normal}"
else
echo "${c}"
fi
done
}
swap_namespace() {
local ctx="$(current_context)"
local ns="$(read_namespace "${ctx}")"
if [[ -z "${ns}" ]]; then
echo "error: No previous namespace found for current context." >&2
exit 1
fi
set_namespace "${ns}"
}
main() {
if [[ "$#" -eq 0 ]]; then
list_namespaces
elif [[ "$#" -eq 1 ]]; then
if [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
usage
elif [[ "${1}" == "-" ]]; then
swap_namespace
elif [[ "${1}" =~ ^-(.*) ]]; then
echo "error: unrecognized flag \"${1}\"" >&2
usage
elif [[ "${1}" =~ (.+)=(.+) ]]; then
alias_context "${BASH_REMATCH[2]}" "${BASH_REMATCH[1]}"
else
set_namespace "${1}"
fi
else
echo "error: too many flags" >&2
usage
fi
}
main "$@"