Select active Kubernetes configuration file for the current terminal session

kx

#!/bin/bash
# Select active Kubernetes configuration file for the current terminal session.
#
# Usage:
# - Configure $all_configs variable in this file. It should be a directory
#   containing kubectl configuration files.
# - Set $KUBECONFIG to the location of the symbolic link that will be created
# - Run this script
#
# This script is meant to be run using the following alias:
#     alias kxx='export KUBECONFIG=$HOME/.kube/tmp_$(date +%s); kx'
#
# Dependencies:
# - https://github.com/junegunn/fzf
#
# Author: stigok, Mar 2020
set -eu

# Path to dir containing multiple configuration files
all_configs="$HOME/.kube/configs"

# Use name from first arugment if supplied
presel=${1:-""}

if [[ -n "$presel" && -f "$all_configs/$presel" ]]
then
  selected="$all_configs/$presel"
else
  # Let user find config by name using fzf
  selected="$all_configs/$(find "$all_configs" -type f -printf '%f\n' | sort | fzf --ansi --no-preview --query="$presel")"
fi
# Symbolic link target for the selected file
target=${KUBECONFIG:-"$HOME/.kube/config"}

# Make sure we're not overwriting existing files
if [[ -e "$target" && ! -L "$target" ]]; then
  >&2 echo "Error: $target exists, but is not a symbolic link. Not overwriting."
  exit 1
fi

if [[ ! -r "$selected" ]]; then
  >&2 echo "Error: selected file does not exist: $selected"
  exit 1
fi

ln -sf "$selected" "$target"
basename "$selected"