#!/bin/bash
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2019-2020 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     foamPackRelease [OPTION]
#
# Description
#     Script generator for packing OpenFOAM sources and submodules.
#
#     The generated script can be further edited as required,
#     or used directly.
#
# Examples
#
# Direct call
#
#     foamPackRelease -tgz origin/master | bash
#
# Modules-only packaging with different api
#
#     foamPackRelease -with-api=1912 -pkg-modules origin/develop
#
# Debian-style without OpenFOAM sub-directory
#
#     foamPackRelease -name=openfoam2002_200129.orig -no-prefix origin/develop
#     foamPackRelease -debian=openfoam2002_200129 origin/develop
#
#------------------------------------------------------------------------------
Script="${0##*/}"

printHelp() {
    cat<<USAGE

Usage: ${0##*/} [OPTION] commit-ish
options:
  -name=NAME        Stem for tar-file (default: auto)
  -output=DIR       Output directory (default: ".")
  -prefix=NAME      Prefix directory within tar-file (default: auto)
  -pkg-modules      Only package submodules - exclude OpenFOAM
  -no-modules       Exclude submodules
  -no-patch         Ignore '_patch' number for output tar-file
  -no-prefix        Do not prefix subdirectory
  -no-compress      Disable compression
  -compress=TYPE    Use specified compression type
  -sep=SEP          Change version/patch separator from '_' to SEP
  -gitbase=DIR      Alternative repository location
  -with-api=NUM     Specify alternative api value for packaging
  -tgz, -xz         Alias for -compress=tgz, -compress=xz
  -debian=NAME      Short-cut for -name=NAME.orig, -no-prefix, -xz
  -help             Print help

Script generator for packing OpenFOAM sources and submodules.
Eg,

    $Script -output=some-dir origin/master > create-tar-file
    sh ./create-tar-file

    $Script -tgz origin/master | bash

USAGE
    exit 0  # A clean exit
}

# Report error and exit
die()
{
    exec 1>&2
    echo
    echo "Error encountered:"
    while [ "$#" -ge 1 ]; do echo "    $1"; shift; done
    echo
    echo "See '${0##*/} -help' for usage"
    echo
    exit 1
}


#-------------------------------------------------------------------------------
outputDir="."
versionSeparator='_'
withPatchNum=true
unset compress packageApi withSource withModules prefixDir tarName
unset gitbase

# Cleanup tarName to remove trailing '.tar', detect compression etc
cleanTarName() {
    case "$tarName" in
    (*.tar)
        tarName="${tarName%.tar}"
        ;;
    (*.tar.*)
        compress="${tarName#*.tar.}"
        tarName="${tarName%.tar*}"
        ;;
    (*.tgz)
        compress="tgz"
        tarName="${tarName%.tgz}"
        ;;
    esac
}


while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help*)
        printHelp
        ;;
    -debian=*)
        tarName="${1#*=}"
        cleanTarName
        if [ "${tarName%.orig}" = "${tarName}" ]
        then
            tarName="${tarName}.orig"  # Append .orig
        fi
        prefixDir=false      # No prefix directory
        : "${compress:=xz}"  # Default 'xz' compression
        ;;
    -name=*)
        tarName="${1#*=}"
        cleanTarName
        ;;
    -output=*)
        outputDir="${1#*=}"
        ;;
    -prefix=*)
        prefixDir="${1#*=}"
        prefixDir="${prefixDir%/}"
        ;;
    -pkg-modules)
        withModules=true
        withSource=false
        ;;
    -no-modules)
        withModules=false
        withSource=true
        ;;
    -no-patch)
        withPatchNum=false
        ;;
    -no-prefix)
        prefixDir=false
        ;;
    -no-compress)
        unset compress
        ;;
    -compress=*)
        compress="${1#*=}"
        ;;
    -sep=*)
        versionSeparator="${1#*=}"
        ;;
    -gitbase=*)
        gitbase="${1#*=}"
        ;;
    -with-api=*)
        packageApi="${1#*=}"
        ;;
    -tgz | -xz)
        compress="${1#*-}"
        ;;
    --)
        shift
        break
        ;;
    -*)
        die "unknown option: '$1'"
        ;;
    *)
        break
        ;;
    esac
    shift
done

commit="$1"
[ "$#" -eq 1 ] && [ -n "$commit" ] || die "Requires one argument (commit-ish)"

# Failsafe patch, version separator
: "${versionSeparator:=_}"

#-------------------------------------------------------------------------------
# Resolve the output directory
outputDir="$(cd "$outputDir" 2>/dev/null && pwd -L)" || \
    die "Cannot resolve output directory"

[ -w "$outputDir" ] || \
    die "Output directory non-writable: $outputDir"

echo "Using outputDir=$outputDir" 1>&2

#-------------------------------------------------------------------------------
# Locate the git repository

# Locate git-dir via rev-parse
findGitDir()
{
    (
        if cd "$1" 2>/dev/null && \
            git rev-parse --is-inside-work-tree > /dev/null 2>&1
        then
            git rev-parse --show-toplevel 2>/dev/null
        fi
    )
}

if [ -d "$PWD/.git" ] && [ -d "$PWD/META-INFO" ]
then
    echo "Use git repository ... from current directory" 1>&2
    gitbase=$(findGitDir "$PWD")
fi

##DEBUG unset gitbase
if [ -z "$gitbase" ]
then
    echo "Find git repository ... from script location" 1>&2
    gitbase=$(findGitDir "${0%/*}")
fi

##DEBUG unset gitbase
if [ -z "$gitbase" ]
then
    echo "Find git repository ... from current directory" 1>&2
    gitbase=$(findGitDir "$PWD")
fi

[ -d "$gitbase/.git" ] || die "Could not locate a git directory"
echo "Detected git repository at $gitbase" 1>&2


# Resolve the given commit-ish to a real commit number.
# Eg, origin/master on input, SHA1 on output
head="$(git --git-dir="$gitbase/.git" rev-parse "$commit")"

[ -n "$head" ] || die "Could resolve requested start point $commit"
echo "Resolved $commit as $head" 1>&2

#-------------------------------------------------------------------------------
# Determine the API and PATCH numbers.
# Extract from META-INFO/api-info

unset api patch sha1

# Grab the sha1 for the file
sha1=$(git --git-dir="$gitbase/.git" ls-tree "$head" META-INFO/api-info | \
    awk '{ if ($2 == "blob") { print $3 }}')


[ -n "$sha1" ] || die "Could locate git content for META-INFO/api-info"

# The api and patch
api="$(git --git-dir="$gitbase/.git" show "$sha1" | sed -ne s/api=//p)"
patch="$(git --git-dir="$gitbase/.git" show "$sha1" | sed -ne s/patch=//p)"

[ -n "$api" ] || die "Could resolve api value"

# Determine the BUILD information from git, as per `wmake -build-info`
build="$(git --git-dir="$gitbase/.git" log -1 --date=short --format='%h=%ad' 2>/dev/null|sed 's/-//g;s/=/-/')"

echo "Detected api, patch, build as '$api', '$patch', '$build'" 1>&2
if [ -n "$packageApi" ]
then
    echo "Specified package api=$packageApi" 1>&2
else
    packageApi="$api"
fi


# Define the output names

if [ -z "$prefixDir" ]
then
    prefixDir="OpenFOAM-v${packageApi}"
    if [ "$withSource" = false ]
    then
        prefixDir="OpenFOAM-modules-v${packageApi}"
    fi
elif [ "$prefixDir" = false ]
then
    unset prefixDir
fi

if [ -z "$tarName" ]
then
    tarName="OpenFOAM-v${packageApi}"
    if [ "$withSource" = false ]
    then
        tarName="OpenFOAM-modules-v${packageApi}"
    fi

    if [ "$withPatchNum" = false ]
    then
        echo "Ignoring patch number for output name" 1>&2
    elif [ "${patch:-0}" -gt 0 ]
    then
        tarName="${tarName}${versionSeparator}${patch}"
    fi
fi

echo 1>&2
echo "Tar-file name:   $tarName.tar" 1>&2
echo "Directory name:  $prefixDir${prefixDir:+/}" 1>&2
echo 1>&2

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

# Create main tar
echo '#!/bin/bash'
echo "cd '$gitbase/' || exit"
echo "api='$api'"
echo "patch='${patch:-0}'"
echo "build='$build'"
echo "head='$head'"
echo "outputDir='$outputDir'"
echo "prefixDir='$prefixDir'"
echo "tarName='$tarName'"

# Always start with an empty tar-file
echo
echo 'umask 0022'
echo 'tar -cf "$outputDir/$tarName.tar" -T /dev/null'

# Directory separator '/' encoded as '@'
echo
echo 'buildInfo="${prefixDir}${prefixDir:+@}META-INFO@build-info"'
echo 'manifest0="${prefixDir}${prefixDir:+@}META-INFO@manifest.txt"'
echo 'manifest1="${prefixDir}${prefixDir:+@}META-INFO@modules-manifest.txt"'
echo '#--------'

#------------------------------------------------------------------------------
# Sort out particulars related to modules
if [ "$withModules" = false ]
then
    echo '# No modules'
    echo 'unset manifest1'
fi

if [ "$withSource" = false ]
then
    echo '# No OpenFOAM source (package modules exclusively)'
    echo 'unset buildInfo'
    echo 'unset manifest0'
fi

echo 'set -x'
echo

#------------------------------------------------------------------------------
# OpenFOAM sources
if [ "$withSource" != false ]
then
    echo 'git -c tar.umask=user archive --format=tar ${prefixDir:+--prefix="$prefixDir/"} -o "$outputDir/$tarName.tar" "$head"'

    # Tag build information with underscore to distinguish from "real" build
    # information when git is available.
    echo 'echo build="${build:+_}$build" > "$outputDir/$buildInfo"'

    echo '{'
    echo '  echo api="$api"'
    echo '  echo patch="$patch"'
    echo '  echo head="$head"'
    echo '  echo'
    echo '  git ls-tree -r "$head"'
    echo '} > "$outputDir/$manifest0"'
fi

#------------------------------------------------------------------------------
# Add in modules
if [ "$withModules" != false ]
then
    echo
    echo '# Modules'
    echo '{'
    echo '  echo "# OpenFOAM modules"'
    echo '  echo api="$api"'
    echo '  echo patch="$patch"'
    echo '  echo head="$head"'
    echo '} > "$outputDir/$manifest1"'

    git --git-dir="$gitbase/.git" ls-tree "$head" modules/ | \
        while read mode gittype sha1 module
    do
        [ "$gittype" == commit ] || continue

        echo
        echo "module=\""$module"\""
        echo "commit=\""$sha1"\""
        echo "tarModule=\""$tarName-${module##*/}"\""
        echo
        echo 'if pushd "$module"; then'
        echo 'moduleDir="$prefixDir${prefixDir:+/}$module"'
        echo 'git -c tar.umask=user archive --format=tar --prefix="$moduleDir/" -o "$outputDir/$tarModule.tar" "$commit"'
        echo '# Without test, validation dirs (potentially large)'
        echo 'tar --delete -f "$outputDir/$tarModule.tar" "$moduleDir/test" "$moduleDir/validation" 2>/dev/null'
        echo 'tar -Af "$outputDir/$tarName.tar" "$outputDir/$tarModule.tar"'
        echo 'rm -f "$outputDir/$tarModule.tar"'
        echo '{'
        echo '  echo'
        echo '  echo "$module"'
        echo '  echo commit="$commit"'
        echo '  echo'
        echo '  # Without test, validation dirs'
        echo '  git ls-tree -r "$commit" | sed -e '"'"'/\ttest\//d;/\tvalidation\//d'"'"
        echo '} >> "$outputDir/$manifest1"'
        echo 'popd; fi'
    done

    echo
    echo '{ echo; echo "# End"; } >> "$outputDir/$manifest1"'
fi

#------------------------------------------------------------------------------
# Add in build-info and manifest files
# Decode '@' in the names as '/' directory separator

echo
echo "echo 'Adding build-info and manifest files'"
echo 'if pushd "$outputDir"; then'
echo "tar --owner=root --group=root --append --transform='s|@|/|g' -v -f \"\$tarName.tar\" \"\$buildInfo\" \"\$manifest0\" \"\$manifest1\""
echo 'rm -f "$buildInfo" "$manifest0" "$manifest1"'
echo 'popd; fi'

echo
echo "# End of creating archive"
echo

#------------------------------------------------------------------------------
# Compression

case "$compress" in
    ('')
    echo "No compression requested" 1>&2
    ;;

    (gz | gzip)
    echo "Using gzip compression" 1>&2
    echo 'gzip -f9 "$outputDir/$tarName.tar"'
    echo
    echo '# End of compression'
    ;;

    (tgz)
    echo "Using gzip compression with tgz ending" 1>&2
    echo 'gzip -c -9 "$outputDir/$tarName.tar" > "$outputDir/$tarName.tgz"'
    echo 'rm -f "$outputDir/$tarName.tar"'
    echo
    echo '# End of compression'
    ;;

    (bz | bzip | bzip2)
    echo "Using bzip2 compression" 1>&2
    echo 'bzip2 -f9 "$outputDir/$tarName.tar"'
    echo
    echo '# End of compression'
    ;;

    (xz)
    echo "Using xz compression" 1>&2
    echo 'xz -f9 "$outputDir/$tarName.tar"'
    echo
    echo '# End of compression'
    ;;

    (*)
    echo "Unknown compression scheme: $compress" 1>&2
    ;;
esac

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