#!/bin/bash
#
# Slackware build script for go
#
# Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017, 2018  Vincent Batts
# Copyright (c) 2012 Eric Schultz
# Copyright 2019-2024 Corrado Franco (https://corradofranco.it)
# All rights reserved.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version, with the following exception:
# the text of the GPL license may be omitted.

# This program is distributed in the hope that it will be useful, but
# without any warranty; without even the implied warranty of
# merchantability or fitness for a particular purpose. Compiling,
# interpreting, executing or merely reading the text of the program
# may result in lapses of consciousness and/or very being, up to and
# including the end of all existence and the Universe as we know it.
# See the GNU General Public License for more details.

# You may have received a copy of the GNU General Public License along
# with this program (most likely, a file named COPYING).  If not, see
# <http://www.gnu.org/licenses/>.
#
# Latest version of this SlackBuild at https://github.com/conraid/SlackBuilds

set -eu

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=go
VERSION=1.23.1
BUILD=${BUILD:-1}
TAG=${TAG:-cf}
TMP=${TMP:-/tmp/pkg}
PKG=$TMP/package-$PKGNAM
OUTPUT=${OUTPUT:-/tmp}

DOCFILES="AUTHORS CONTRIBUT* LICENSE PATENTS README*"

unset GOBIN GOPATH GOOS GOARCH BASH_ENV

if [ -z ${ARCH:=""} ]; then
  case "$( uname -m )" in
    i?86) ARCH=i686 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME:-""}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz "
  exit 0
fi

if [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=pentium4 -mtune=generic"
  LIBDIRSUFFIX=""
  export GOARCH="386"
  export GO386="softfloat"
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -march=x86-64 -mtune=generic -fPIC -pipe -fomit-frame-pointer"
  LIBDIRSUFFIX="64"
  export GOARCH="amd64"
elif [ "$ARCH" = "arm" ]; then
  LIBDIRSUFFIX=""
  export GOARCH="arm"
  export GOARM="6"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
  export GOARCH="386"
fi

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT $PKG/usr/lib${LIBDIRSUFFIX}
cd $PKG/usr/lib${LIBDIRSUFFIX}/
tar xvf $CWD/${PKGNAM}${VERSION}.src.tar.gz
cd $PKGNAM

chown -R root:root .
find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \; -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;

# Apply patches
if [ -e $CWD/patches ]; then
  for PATCH in $CWD/patches/*.patch; do
    patch -p1 -i $PATCH
  done
fi

RELEASE="linux"

# Uncomment if not boostraping with gcc-go
export GOROOT_BOOTSTRAP="/usr/lib${LIBDIRSUFFIX}/go"

export GOROOT="$(pwd)"
export GOROOT_FINAL="/usr/lib${LIBDIRSUFFIX}/go"

cd src
LC_ALL=C ./make.bash -v
$GOROOT/bin/go install -buildmode=shared -v std
cd ..

# Clean temporary files
rm -rf $PKG/usr/lib${LIBDIRSUFFIX}/go/pkg/{bootstrap,obj/go-build,tool/*/api}

if [ -d $PKG/usr/man ]; then
  find $PKG/usr/man -type f -exec chmod 644 {} \; -exec gzip -9 {} \;
  for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
fi

# Put the profile scripts for setting PATH and env variables
mkdir -p $PKG/etc/profile.d
cat > $PKG/etc/profile.d/go.csh << EOF
#!/bin/csh
seten GOROOT ${GOROOT_FINAL}
setenv PATH \${GOROOT}/bin:\${PATH}
EOF
cat > $PKG/etc/profile.d/go.sh << EOF
#!/bin/sh
export GOROOT="${GOROOT_FINAL}"
export PATH="\${GOROOT}/bin:\${PATH}"
EOF

chmod 0755 $PKG/etc/profile.d/go.csh
chmod 0755 $PKG/etc/profile.d/go.sh

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a $DOCFILES $PKG/usr/doc/$PKGNAM-$VERSION || true
ln -s $GOROOT_FINAL/doc $PKG/usr/doc/$PKGNAM-$VERSION
cat $CWD/$PKGNAM.SlackBuild > $PKG/usr/doc/$PKGNAM-$VERSION/$PKGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
if [ -e $CWD/slack-required ]; then
  cat $CWD/slack-required > $PKG/install/slack-required
fi

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PKGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-txz}
