gk8s

#!/usr/bin/env bash

cat <<'EOF'
  This tool is deprecated.
  Please use the Golang version of this script instead:
     https://github.com/icy/gk8s
EOF

exit 0

# Date    : 2019-09-06
# Author  : Ky-Anh Huynh
# Purpose : wrapper for all k8s commands/clusters
# Source  : https://github.com/icy/bashy/blob/master/bin/gk8s
# TODOs   :
#
# - [ ] Should migrate to enviroment use instead?
#
# Ideas
#
#   1. Hook up $HOME variable
#   2. Explicitly avoid kind of human mistakes when dealing with
#       multiple clusters and namespaces
#   3. To use with/by non-human scripts ;)
#
# Usage
#
# 1. Initialize clusters' root
#
#   $ mkdir ~/projects/gk8s/<cluster-name>
#   $ cd ~/projects/gk8s/<cluster-name>
#   $ touch .gk8s
#
# 2. Provision aws configurations
#
#   $ ln -s ~/.aws .aws
#
#   If you don't do this, the script tries to create symlink automatically.
#
# 3. Provision k8s configurations
#
#   $ ln -s ~/.kube .kube
#
# 5. Invoke the command
#
#   $ gk8s get pods      # on the default namespace,
#                        # on namespace specified in `.gk8s`
#   $ gk8s get pods @%   # on all namespaces
#
#   You can move around and execute your alias command instead
#
#   $ cd /my/parent/home
#   $ gk8s :cluster-name get pods
#
#  `kubectl` is injected when you are not specifed them as your first
#  argument. E.g, `gk8s get pods` is the same as `gk8s kubectl get pods`.
#
# Other usage
#
# 1. Move around the root: use `GK8S_HOME` instead of ~/projects/gk8s/.
#    You can specify this in `~/.config/gk8s`.
# 2. To allow debugging, use `VERBOSE=2 gk8s <...>`
#

_ver="${BASH_VERSINFO[0]}"
if [[ "$_ver" -lt 4 ]]; then
  echo >&2 ":: $0: Sorry, Bash >=4 is required."
  exit 1
fi

_log2() {
  [[ "${VERBOSE:-0}" -ge 2 ]] || return 0
  echo >&2 ":: ${*}"
}

_help() {
  echo >&2 ":: Please specify a command."
}

GK8S_HOME="${GK8S_HOME:-$HOME/projects/gk8s}";
export GK8S_HOME; readonly GK8S_HOME

# Try to learn if the first argument is about the cluster name
first_arg="${1:-}"
if [[ "${first_arg:0:1}" == ":" ]]; then
  shift
  _CLUSTER="${first_arg:1}"
  if [[ -z "$_CLUSTER" ]]; then
    # FIXME: remove duplicate code...
    _CLUSTER="$(pwd)"
    NHOME="$(pwd -P)"
    _CLUSTER="${_CLUSTER##*/}"
  else
    ( cd "$GK8S_HOME/$_CLUSTER/" || exit ; )
    NHOME="$GK8S_HOME/$_CLUSTER/"
  fi
else
  _CLUSTER="$(pwd)"
  NHOME="$(pwd -P)"
  _CLUSTER="${_CLUSTER##*/}"
fi

export NHOME; readonly NHOME

if [[ ! -f "$NHOME/.gk8s" ]]; then
  echo >&2 "... Missing .gk8s file in working directory '$NHOME'."
  if [[ -f "$NHOME/.k8s" ]]; then
    echo >&2 ".... found .k8s file. Rename this file to .gk8s would help."
  fi
  exit 1
fi

if [[ ! -f "$NHOME/.kube/config" ]]; then
  echo >&2 ":: kubectl config file not found: $NHOME/.kube/config"
  exit 1
fi

if [[ "$#" -eq 0 ]]; then
  set -- _help
fi

_ns="--namespace ${GK8S_NAMESPACE:-default}"

case "${1:-}" in
"kubectl"*|"helm"*|_help)
  ;;
"--")
  shift;
  ;;
*)
  set -- kubectl "$@"
  ;;
esac

# Insert the namespace configuration...
_cmd1="$1";
case "$_cmd1" in
kubectl|kubectl.*)
  _log2 "Original command: '$@'"
  shift;
  _cmd2="$1"; shift;
  case "$_cmd2" in
  "apply"|"diff"|"delete")
    set -- "$_cmd1" "$_cmd2" "$@"
    ;;
  *)
    set -- "$_cmd1" "$_cmd2" $_ns "$@"
    _log2 "Modified command: '$@'"
    ;;
  esac
  ;;
esac

export OHOME="$HOME"; readonly OHOME
export HOME="$NHOME"

_oargs=( "$@" )
_start=0
while [[ "$_start" -le "${#_oargs}" ]]; do
  case "${_oargs[$_start]}" in
  "@%")
    _oargs["$_start"]="--all-namespaces"
    ;;
  esac
  (( _start ++ ))
done

set -- "${_oargs[@]}"

# Print heading...
_log2 ":: Cluster   : $_CLUSTER, input namespace: $_ns"
_log2 ":: WDir      : $(pwd)"
_log2 ":: Command   : $@"
_log2 ":: OHOME     : $OHOME"
_log2 ":: NHOME     : $HOME"
_log2 ":: GK8S_HOME : $GK8S_HOME"

if [[ -f "$NHOME/.gk8s.lock" ]]; then
  echo >&2 ":: Lock file found $NHOME/.gk8s.lock. Action can not be processed."
  exit 1
fi

if grep -qsEe "[[:space:]]delete[[:space:]]" <<< $* ; then
  if [[ ! -f ".delete" ]]; then
    echo >&2 ":: Action delete was requested but confirmation file (.delete) not found"
    echo >&2 ":: Working directory: $(pwd)"
    exit 127
  fi
  _log2 ":: Removing confirmation file: $(pwd)/.delete"
  1>&2 rm -fv .delete
fi
[[ "${VERBOSE:-0}" -ge 2 ]] && set -x
# Create a symlink to ~/.aws if necessary
if [[ ! -d "$NHOME/.aws" && -d "$OHOME/.aws" ]]; then
  1>&2 ln -sv "$OHOME/.aws" "$NHOME/.aws"
fi

"${@}"