#!/bin/bash

# Use newrelease.sh to update the kubernetes spec file with any change in release

# or go lang version. The goal is to separate changes to the spec file related

# to kubernetes from changes to spec file function and capabilities. This is not

# needed for the current kubernetes packages in Fedora (a single version of

# k8s for each Fedora release), but useful if not necessary for the planned

# deployment of multiple versions of k8s per Fedora release.

#

#

set -o errexit

set -o nounset

set -o pipefail

# default configuration file name

CFG_NAME=./newrelease.conf

# default template name postfix

# TEMPLATE_POSTFIX="-template.spec"

###

### newrelease - set up for a new version of kubernetes. Does the following:

###    1. Checks for configuration file and creates if missing. Optionally,

###       create a draft configuration file.

###    2. Use data from configuration file to generate kubernetes.spec

###       from the ./template/kubernetes-template.spec template file.

###    3. Download source, if needed, based on configuration.

###

###    Configuration file is named 'newrelease.conf'.

###

### Usage:

###   newrelease.sh               -- this help file

###   newrelease.sh -h            -- this help file

###   newrelease.sh -c            -- generate configuration file

###   newrelease.sh -y            -- execute using configuration file

###

### Options:

###  -y         Execute script using configuration file. If configuration

###             does not exist then create draft

###  -c         Create draft configuration file

###  -h         Show this message

###

# See: https://gist.github.com/kovetskiy/a4bb510595b3a6b17bfd1bd9ac8bb4a5

help() {

  sed -rn 's/^### ?//;T;p' "$0"

}

# display help and exit if no arguements, -h or not either

# -y or -c

if [[ $# == 0 || $1 == "-h" || ! ($1 =~ (-y|-c)) ]]; then

  help

  exit 1

fi

# if -c flag, create config file and exit

if [[ ($1 =~ (-c|-C)) || ($1 == "-y" && ! -f "$CFG_NAME") ]]; then

  if [ -f "$CFG_NAME" ]

  then

    echo "** Configuration file already exists. "

    echo "** Remove to create a new configuration file or edit and reuse."

    help

    exit 1

  fi

  echo " Creating draft configuration file"

  echo " Edit ${CFG_NAME} with release information and rerun script"

  {

    printf "# spec file name\nexport SPEC_NAME=kubernetes\n\n"

    printf "# spec template name and path\nTEMPLATE=./template/kubernetes-template.spec\n\n"

    printf "# kubernetes release tag from git repository\n# e.g. export GIT_TAG=v1.24.3\nexport GIT_TAG=vxx.xx.xx\n\n"

    printf "# the 'built-with' golang version - expressed as SEMVER\n# e.g. export GOLANG_VERSION=1.18.3\nexport GOLANG_VERSION=xx.xx.xx"

  } >> "${CFG_NAME}"

  exit 1

fi

# load config file from local directory using CFG_NAME

# format is standard bash source.

# variables are:

# SPEC_NAME - name of the spec file to process

# GIT_TAG - release tag of package

# GOLANG_VERSION - minimal golang version (version used in build)

# shellcheck disable=SC1090

source "${CFG_NAME}"

echo "Sourcing ${CFG_NAME}"

# generate needed values

# do not edit warning

export WARNING="# Do not edit this spec file. (Re-)Generate using newrelease.sh"

# spec file in this repository

SPEC=${SPEC_NAME}.spec

# strip and v or V prefix, if any for tar file name and spec name

export TAR_VERSION="${GIT_TAG#[vV]}"

# replace dash (if any) with tilde for spec file version

export SPEC_VERSION="${TAR_VERSION//-/\~}"

# export MAJ_MIN

MAJ_MIN=$( echo "${SPEC_VERSION}" | cut -f1,2 -d".")

# echo settings

echo "Spec file: ${SPEC}"

echo "Spec name: ${SPEC_NAME}"

echo "Template: ${TEMPLATE}"

echo "GIT Tag: ${GIT_TAG}"

echo "Tar Version: ${TAR_VERSION}"

echo "Version: ${SPEC_VERSION}"

echo "Major:Minor: ${MAJ_MIN}"

echo "Golang Version: ${GOLANG_VERSION}"

# basic clean up - remove spec if they exist

if [ -f "./${SPEC}" ]; then

  rm "./${SPEC}"

  echo "removed old spec file - ${SPEC}"

fi

# basic clean up - remove other spec file(s) if they exist

if [ -f "./*.spec" ]; then

  rm "./*.spec"

  echo "removed other spec file(s)"

fi

# create spec file from template using variables from

# configuration file

# inspiration: https://blog.tratif.com/2023/01/27/bash-tips-3-templating-in-bash-scripts/

echo "creating ${SPEC}"

# spec template spec file (must exist)

if ! [ -f  "${TEMPLATE}" ]; then

  echo "${TEMPLATE} - spec template missing"

  exit 1

fi

# shellcheck disable=2016

< "${TEMPLATE}" envsubst '$WARNING,$GIT_TAG,$TAR_VERSION,$SPEC_NAME,$SPEC_VERSION,$GOLANG_VERSION' > "${SPEC}"

# download source

echo "Downloading source if needed"

echo "${SPEC_NAME}-${TAR_VERSION}.tar.gz"

spectool -g -s 0 "${SPEC}"

echo "****Don't forget to run: fedpkg new-sources ${SPEC_NAME}-${TAR_VERSION}.tar.gz"