#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     create-tar [OPTION]
#
# Description
#     Create a tar-file from OpenFOAM repository
#     Grab and modify a corresponding .spec file, with rpmlintrc
#
# Requires
#     bash curl git tar gzip sed
#
#------------------------------------------------------------------------------
repoUrl="https://develop.openfoam.com/Development/OpenFOAM-plus"
specUrl="$repoUrl/wikis/packaging/common"
specName="openfoamVERSION.spec"

branch="master"
release=0

#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -gt 0 ]; do echo "$1"; shift; done
cat <<USAGE

Usage: ${0##*/} [OPTION]
options:
   -output=DIR      Write to alternative output directory
   -branch=NAME     Branch or tag name (default: master)
   -release=NUM     RPM release number (default: 0)
   -release=(date|patch)
                    Release numbering according to YYMMD or patch-level
   -dist            Add RedHat dist macro to the release number
   -no-modules      Exclude submodules
   -no-spec         Exclude generation of spec file
   -keep-tmp        Retain tmp directory (debugging only)
   -verbose         Execute script with 'set -x'
   -help            Print help

Create a tar-file from OpenFOAM repository
Grab and modify a corresponding .spec file, with rpmlintrc

Example,

    sh ./create-tar -branch=main-v1812 -release=patch -dist

Branch shortcuts:
  | main-xyz       | maintenance-xyz
  | rel-xyz        | release-xyz

USAGE
    exit 1
}

#-------------------------------------------------------------------------------
outputDir="."
gitDir="git-dir-tmp$$"  # Temporary subdir name within outputDir

unset api patch distMacro skipModules skipSpec keepTmpDir verbose

while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help*)
        usage
        ;;
    -output=*)
        outputDir="${1#*=}"
        ;;
    -branch=*)
        branch="${1#*=}"
        ;;
    -release=[0-9]* | -release=patch)
        release="${1#*=}"
        ;;
    -release=date)
        release="$(date +%y%m%d)"  # YYMMDD like OpenFOAM patch-level
        ;;
    -dist)
        distMacro="%{?dist}"
        ;;
    -no-modules)
        skipModules=true
        ;;
    -no-spec)
        skipSpec=true
        ;;
    -keep-tmp)
        keepTmpDir=true
        ;;
    -verbose)
        verbose=true
        ;;
    esac
    shift
done

# Shortcuts
case "$branch" in
main-*)
    branch="maintenance-${branch#*-}"
    ;;
rel-*)
    branch="release-${branch#*-}"
    ;;
esac


#-------------------------------------------------------------------------------

echo "Creating output in $outputDir"
echo "branch = ${branch}"
if [ -n "$skipSpec" ]
then
    echo "tar-file only (no spec)"
else
    echo "release = ${release}${distMacro}"
fi
echo


if [ -d "$outputDir/$gitDir" ]
then
    echo "Removing existing directory: $outputDir/$gitDir"
    rm -rf -- "$outputDir/$gitDir" 2>/dev/null
fi
mkdir -p "$outputDir"

[ "$verbose" = true ] && set -x

git clone -n --depth=1 \
    --branch="$branch" \
    "${repoUrl}.git" "$outputDir/$gitDir"

oldDir="$PWD"
if cd "$outputDir/$gitDir"  # pushd
then
    # The most current foamPackRelease (from develop branch)
    curl "${repoUrl}/raw/develop/bin/tools/foamPackRelease" > foamPackRelease

    # Minimum needed to get api/patch values
    git checkout HEAD -- bin/foamEtcFile META-INFO

    api="$(bin/foamEtcFile -show-api)"
    patch="$(bin/foamEtcFile -show-patch)"

    # Apparently cannot update submodule without checking out files
    if [ -z "$skipModules" ]
    then
        git checkout HEAD -- .gitmodules modules
        git submodule init && git submodule update --depth=1
    fi

    # Fetch tgz file, placing into parent dir (out-dir)
    bash ./foamPackRelease \
        ${skipModules:+-no-modules} \
        -tgz -output=.. HEAD | \
        bash

    # Preserve some information?
    # for file in META-INFO/api-info
    # do
    #     if [ -f "$file" ]
    #     then
    #         cp "$file" ..
    #     fi
    # done

    cd "$oldDir" # popd
else
    echo "Could not change to $outputDir/$gitDir, did git clone fail?"
    exit 1
fi


if [ "${keepTmpDir}" = true ]
then
    echo "Retaining $outputDir/$gitDir"
    echo "   ... must be removed manually"
else
    echo "Removing $outputDir/$gitDir"
    rm -rf -- "$outputDir/$gitDir" 2>/dev/null
fi

if [ -n "${skipSpec}" ]
then
    echo "Created tar only, without spec file"
    exit 0
fi


# Filtering rules
unset filterPatch filterRelease

# Change foam_patch %{nil} -> foam_patch _patchNum
if [ "${patch:-0}" != 0 ]
then
    filterPatch="/%define *foam_patch/s/patch.*\$/patch _${patch}/"
fi

# Any special handling for release info?
case "${release}" in
patch)
    release="${patch:-0}"
    ;;
esac

# Modify release info in spec file,
# include '%{?dist}' macro (RedHat) if specified
if [ "${release:-0}" != 0 ]
then
    filterRelease='s/^\(Release: *\).*/\1'"${release}${distMacro}/"
fi


oldDir="$PWD"
if cd "$outputDir"  # pushd
then
    # Grab and modify the spec file
    curl "${specUrl}/${specName}" \
        | sed -e 's/^\(Name: *\).*/\1'"openfoam$api/" \
        | sed -e 's/^\(Version: *\).*/\1'"$api/" \
        | sed -e "${filterPatch}" \
        | sed -e "${filterRelease}" \
        > "openfoam${api}.spec"

    # Grab the rmplintrc file
    curl "${specUrl}/openfoam-rpmlintrc" > "openfoam-rpmlintrc"

    # List the files
    ls -al

    cd "$oldDir"  # popd
else
    echo "Could not change to $outputDir, should not happen"
    exit 1
fi

# -----------------------------------------------------------------------------