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@luisdavim luisdavim fixes #98 8f1bf36 Jul 17, 2019
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@jonmosco @bradym @luisdavim @sistason @jamesmcdonald @ahmetb
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#!/bin/bash
# Kubernetes prompt helper for bash/zsh
# Displays current context and namespace
# Copyright 2019 Jon Mosco
#
# 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.
# Debug
[[ -n $DEBUG ]] && set -x
# Default values for the prompt
# Override these values in ~/.zshrc or ~/.bashrc
KUBE_PS1_BINARY="${KUBE_PS1_BINARY:-kubectl}"
KUBE_PS1_SYMBOL_ENABLE="${KUBE_PS1_SYMBOL_ENABLE:-true}"
KUBE_PS1_SYMBOL_DEFAULT=${KUBE_PS1_SYMBOL_DEFAULT:-$'\u2388 '}
KUBE_PS1_SYMBOL_USE_IMG="${KUBE_PS1_SYMBOL_USE_IMG:-false}"
KUBE_PS1_NS_ENABLE="${KUBE_PS1_NS_ENABLE:-true}"
KUBE_PS1_CONTEXT_ENABLE="${KUBE_PS1_CONTEXT_ENABLE:-true}"
KUBE_PS1_PREFIX="${KUBE_PS1_PREFIX-(}"
KUBE_PS1_SEPARATOR="${KUBE_PS1_SEPARATOR-|}"
KUBE_PS1_DIVIDER="${KUBE_PS1_DIVIDER-:}"
KUBE_PS1_SUFFIX="${KUBE_PS1_SUFFIX-)}"
KUBE_PS1_SYMBOL_COLOR="${KUBE_PS1_SYMBOL_COLOR-blue}"
KUBE_PS1_CTX_COLOR="${KUBE_PS1_CTX_COLOR-red}"
KUBE_PS1_NS_COLOR="${KUBE_PS1_NS_COLOR-cyan}"
KUBE_PS1_BG_COLOR="${KUBE_PS1_BG_COLOR}"
KUBE_PS1_KUBECONFIG_CACHE="${KUBECONFIG}"
KUBE_PS1_DISABLE_PATH="${HOME}/.kube/kube-ps1/disabled"
KUBE_PS1_LAST_TIME=0
KUBE_PS1_CLUSTER_FUNCTION="${KUBE_PS1_CLUSTER_FUNCTION}"
KUBE_PS1_NAMESPACE_FUNCTION="${KUBE_PS1_NAMESPACE_FUNCTION}"
# Determine our shell
if [ "${ZSH_VERSION-}" ]; then
KUBE_PS1_SHELL="zsh"
elif [ "${BASH_VERSION-}" ]; then
KUBE_PS1_SHELL="bash"
fi
_kube_ps1_init() {
[[ -f "${KUBE_PS1_DISABLE_PATH}" ]] && KUBE_PS1_ENABLED=off
case "${KUBE_PS1_SHELL}" in
"zsh")
_KUBE_PS1_OPEN_ESC="%{"
_KUBE_PS1_CLOSE_ESC="%}"
_KUBE_PS1_DEFAULT_BG="%k"
_KUBE_PS1_DEFAULT_FG="%f"
setopt PROMPT_SUBST
autoload -U add-zsh-hook
add-zsh-hook precmd _kube_ps1_update_cache
zmodload -F zsh/stat b:zstat
zmodload zsh/datetime
;;
"bash")
_KUBE_PS1_OPEN_ESC=$'\001'
_KUBE_PS1_CLOSE_ESC=$'\002'
_KUBE_PS1_DEFAULT_BG=$'\033[49m'
_KUBE_PS1_DEFAULT_FG=$'\033[39m'
[[ $PROMPT_COMMAND =~ _kube_ps1_update_cache ]] || PROMPT_COMMAND="_kube_ps1_update_cache;${PROMPT_COMMAND:-:}"
;;
esac
}
_kube_ps1_color_fg() {
local KUBE_PS1_FG_CODE
case "${1}" in
black) KUBE_PS1_FG_CODE=0;;
red) KUBE_PS1_FG_CODE=1;;
green) KUBE_PS1_FG_CODE=2;;
yellow) KUBE_PS1_FG_CODE=3;;
blue) KUBE_PS1_FG_CODE=4;;
magenta) KUBE_PS1_FG_CODE=5;;
cyan) KUBE_PS1_FG_CODE=6;;
white) KUBE_PS1_FG_CODE=7;;
# 256
[0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-6]) KUBE_PS1_FG_CODE="${1}";;
*) KUBE_PS1_FG_CODE=default
esac
if [[ "${KUBE_PS1_FG_CODE}" == "default" ]]; then
KUBE_PS1_FG_CODE="${_KUBE_PS1_DEFAULT_FG}"
return
elif [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
KUBE_PS1_FG_CODE="%F{$KUBE_PS1_FG_CODE}"
elif [[ "${KUBE_PS1_SHELL}" == "bash" ]]; then
if tput setaf 1 &> /dev/null; then
KUBE_PS1_FG_CODE="$(tput setaf ${KUBE_PS1_FG_CODE})"
elif [[ $KUBE_PS1_FG_CODE -ge 0 ]] && [[ $KUBE_PS1_FG_CODE -le 256 ]]; then
KUBE_PS1_FG_CODE="\033[38;5;${KUBE_PS1_FG_CODE}m"
else
KUBE_PS1_FG_CODE="${_KUBE_PS1_DEFAULT_FG}"
fi
fi
echo ${_KUBE_PS1_OPEN_ESC}${KUBE_PS1_FG_CODE}${_KUBE_PS1_CLOSE_ESC}
}
_kube_ps1_color_bg() {
local KUBE_PS1_BG_CODE
case "${1}" in
black) KUBE_PS1_BG_CODE=0;;
red) KUBE_PS1_BG_CODE=1;;
green) KUBE_PS1_BG_CODE=2;;
yellow) KUBE_PS1_BG_CODE=3;;
blue) KUBE_PS1_BG_CODE=4;;
magenta) KUBE_PS1_BG_CODE=5;;
cyan) KUBE_PS1_BG_CODE=6;;
white) KUBE_PS1_BG_CODE=7;;
# 256
[0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-6]) KUBE_PS1_BG_CODE="${1}";;
*) KUBE_PS1_BG_CODE=$'\033[0m';;
esac
if [[ "${KUBE_PS1_BG_CODE}" == "default" ]]; then
KUBE_PS1_FG_CODE="${_KUBE_PS1_DEFAULT_BG}"
return
elif [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
KUBE_PS1_BG_CODE="%K{$KUBE_PS1_BG_CODE}"
elif [[ "${KUBE_PS1_SHELL}" == "bash" ]]; then
if tput setaf 1 &> /dev/null; then
KUBE_PS1_BG_CODE="$(tput setab ${KUBE_PS1_BG_CODE})"
elif [[ $KUBE_PS1_BG_CODE -ge 0 ]] && [[ $KUBE_PS1_BG_CODE -le 256 ]]; then
KUBE_PS1_BG_CODE="\033[48;5;${KUBE_PS1_BG_CODE}m"
else
KUBE_PS1_BG_CODE="${DEFAULT_BG}"
fi
fi
echo ${OPEN_ESC}${KUBE_PS1_BG_CODE}${CLOSE_ESC}
}
_kube_ps1_binary_check() {
command -v $1 >/dev/null
}
_kube_ps1_symbol() {
[[ "${KUBE_PS1_SYMBOL_ENABLE}" == false ]] && return
case "${KUBE_PS1_SHELL}" in
bash)
if ((BASH_VERSINFO[0] >= 4)) && [[ $'\u2388 ' != "\\u2388 " ]]; then
KUBE_PS1_SYMBOL="${KUBE_PS1_SYMBOL_DEFAULT}"
# KUBE_PS1_SYMBOL=$'\u2388 '
KUBE_PS1_SYMBOL_IMG=$'\u2638 '
else
KUBE_PS1_SYMBOL=$'\xE2\x8E\x88 '
KUBE_PS1_SYMBOL_IMG=$'\xE2\x98\xB8 '
fi
;;
zsh)
KUBE_PS1_SYMBOL="${KUBE_PS1_SYMBOL_DEFAULT}"
KUBE_PS1_SYMBOL_IMG="\u2638 ";;
*)
KUBE_PS1_SYMBOL="k8s"
esac
if [[ "${KUBE_PS1_SYMBOL_USE_IMG}" == true ]]; then
KUBE_PS1_SYMBOL="${KUBE_PS1_SYMBOL_IMG}"
fi
echo "${KUBE_PS1_SYMBOL}"
}
_kube_ps1_split() {
type setopt >/dev/null 2>&1 && setopt SH_WORD_SPLIT
local IFS=$1
echo $2
}
_kube_ps1_file_newer_than() {
local mtime
local file=$1
local check_time=$2
if [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
mtime=$(zstat -L +mtime "${file}")
elif stat -c "%s" /dev/null &> /dev/null; then
# GNU stat
mtime=$(stat -L -c %Y "${file}")
else
# BSD stat
mtime=$(stat -L -f %m "$file")
fi
[[ "${mtime}" -gt "${check_time}" ]]
}
_kube_ps1_update_cache() {
local return_code=$?
[[ "${KUBE_PS1_ENABLED}" == "off" ]] && return $return_code
if ! _kube_ps1_binary_check "${KUBE_PS1_BINARY}"; then
# No ability to fetch context/namespace; display N/A.
KUBE_PS1_CONTEXT="BINARY-N/A"
KUBE_PS1_NAMESPACE="N/A"
return
fi
if [[ "${KUBECONFIG}" != "${KUBE_PS1_KUBECONFIG_CACHE}" ]]; then
# User changed KUBECONFIG; unconditionally refetch.
KUBE_PS1_KUBECONFIG_CACHE=${KUBECONFIG}
_kube_ps1_get_context_ns
return
fi
# kubectl will read the environment variable $KUBECONFIG
# otherwise set it to ~/.kube/config
local conf
for conf in $(_kube_ps1_split : "${KUBECONFIG:-${HOME}/.kube/config}"); do
[[ -r "${conf}" ]] || continue
if _kube_ps1_file_newer_than "${conf}" "${KUBE_PS1_LAST_TIME}"; then
_kube_ps1_get_context_ns
return
fi
done
return $return_code
}
_kube_ps1_get_context() {
if [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]]; then
KUBE_PS1_CONTEXT="$(${KUBE_PS1_BINARY} config current-context 2>/dev/null)"
# Set namespace to 'N/A' if it is not defined
KUBE_PS1_CONTEXT="${KUBE_PS1_CONTEXT:-N/A}"
if [[ ! -z "${KUBE_PS1_CLUSTER_FUNCTION}" ]]; then
KUBE_PS1_CONTEXT=$($KUBE_PS1_CLUSTER_FUNCTION $KUBE_PS1_CONTEXT)
fi
fi
}
_kube_ps1_get_ns() {
if [[ "${KUBE_PS1_NS_ENABLE}" == true ]]; then
KUBE_PS1_NAMESPACE="$(${KUBE_PS1_BINARY} config view --minify --output 'jsonpath={..namespace}' 2>/dev/null)"
# Set namespace to 'default' if it is not defined
KUBE_PS1_NAMESPACE="${KUBE_PS1_NAMESPACE:-default}"
if [[ ! -z "${KUBE_PS1_NAMESPACE_FUNCTION}" ]]; then
KUBE_PS1_NAMESPACE=$($KUBE_PS1_NAMESPACE_FUNCTION $KUBE_PS1_NAMESPACE)
fi
fi
}
_kube_ps1_get_context_ns() {
# Set the command time
if [[ "${KUBE_PS1_SHELL}" == "bash" ]]; then
if ((BASH_VERSINFO[0] >= 4)); then
KUBE_PS1_LAST_TIME=$(printf '%(%s)T')
else
KUBE_PS1_LAST_TIME=$(date +%s)
fi
elif [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
KUBE_PS1_LAST_TIME=$EPOCHSECONDS
fi
_kube_ps1_get_context
_kube_ps1_get_ns
}
# Set kube-ps1 shell defaults
_kube_ps1_init
_kubeon_usage() {
cat <<"EOF"
Toggle kube-ps1 prompt on
Usage: kubeon [-g | --global] [-h | --help]
With no arguments, turn off kube-ps1 status for this shell instance (default).
-g --global turn on kube-ps1 status globally
-h --help print this message
EOF
}
_kubeoff_usage() {
cat <<"EOF"
Toggle kube-ps1 prompt off
Usage: kubeoff [-g | --global] [-h | --help]
With no arguments, turn off kube-ps1 status for this shell instance (default).
-g --global turn off kube-ps1 status globally
-h --help print this message
EOF
}
kubeon() {
if [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
_kubeon_usage
elif [[ "${1}" == '-g' || "${1}" == '--global' ]]; then
rm -f -- "${KUBE_PS1_DISABLE_PATH}"
elif [[ "$#" -ne 0 ]]; then
echo -e "error: unrecognized flag ${1}\\n"
_kubeon_usage
return
fi
KUBE_PS1_ENABLED=on
}
kubeoff() {
if [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
_kubeoff_usage
elif [[ "${1}" == '-g' || "${1}" == '--global' ]]; then
mkdir -p -- "$(dirname "${KUBE_PS1_DISABLE_PATH}")"
touch -- "${KUBE_PS1_DISABLE_PATH}"
elif [[ $# -ne 0 ]]; then
echo "error: unrecognized flag ${1}" >&2
_kubeoff_usage
return
fi
KUBE_PS1_ENABLED=off
}
# Build our prompt
kube_ps1() {
[[ "${KUBE_PS1_ENABLED}" == "off" ]] && return
[[ -z "${KUBE_PS1_CONTEXT}" ]] && [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]] && return
local KUBE_PS1
local KUBE_PS1_RESET_COLOR="${_KUBE_PS1_OPEN_ESC}${_KUBE_PS1_DEFAULT_FG}${_KUBE_PS1_CLOSE_ESC}"
# Background Color
[[ -n "${KUBE_PS1_BG_COLOR}" ]] && KUBE_PS1+="$(_kube_ps1_color_bg ${KUBE_PS1_BG_COLOR})"
# Prefix
[[ -n "${KUBE_PS1_PREFIX}" ]] && KUBE_PS1+="${KUBE_PS1_PREFIX}"
# Symbol
KUBE_PS1+="$(_kube_ps1_color_fg $KUBE_PS1_SYMBOL_COLOR)$(_kube_ps1_symbol)${KUBE_PS1_RESET_COLOR}"
if [[ -n "${KUBE_PS1_SEPARATOR}" ]] && [[ "${KUBE_PS1_SYMBOL_ENABLE}" == true ]]; then
KUBE_PS1+="${KUBE_PS1_SEPARATOR}"
fi
# Context
if [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]]; then
KUBE_PS1+="$(_kube_ps1_color_fg $KUBE_PS1_CTX_COLOR)${KUBE_PS1_CONTEXT}${KUBE_PS1_RESET_COLOR}"
fi
# Namespace
if [[ "${KUBE_PS1_NS_ENABLE}" == true ]]; then
if [[ -n "${KUBE_PS1_DIVIDER}" ]] && [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]]; then
KUBE_PS1+="${KUBE_PS1_DIVIDER}"
fi
KUBE_PS1+="$(_kube_ps1_color_fg ${KUBE_PS1_NS_COLOR})${KUBE_PS1_NAMESPACE}${KUBE_PS1_RESET_COLOR}"
fi
# Suffix
[[ -n "${KUBE_PS1_SUFFIX}" ]] && KUBE_PS1+="${KUBE_PS1_SUFFIX}"
# Close Background color if defined
[[ -n "${KUBE_PS1_BG_COLOR}" ]] && KUBE_PS1+="${_KUBE_PS1_OPEN_ESC}${_KUBE_PS1_DEFAULT_BG}${_KUBE_PS1_CLOSE_ESC}"
echo "${KUBE_PS1}"
}
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