#!/bin/bash

# Slackware build script for google-go-lang

# Written by Eric Schultz eric at schultzter.ca
# Taken over by Vincent Batts vbatts@hashbangbash.com

# Copyright (c) 2012, 2013, 2014, 2015, 2016, 2017, 2018  Vincent Batts
# Copyright (c) 2012 Eric Schultz
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

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

PRGNAM=google-go-lang
VERSION=${VERSION:-1.21.2}
BOOTSTRAP_VERSION=${BOOTSTRAP_VERSION:-1.19.13}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

RELEASE=${RELEASE:-linux}

RUN_TEST=${RUN_TEST:-false}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

if [ "$ARCH" = "i586" ]; then
  LIBDIRSUFFIX=""
  GOARCH="386"
elif [ "$ARCH" = "x86_64" ]; then
  LIBDIRSUFFIX="64"
  GOARCH="amd64"
elif [ "$ARCH" = "arm" ]; then
  LIBDIRSUFFIX=""
  GOARCH="arm"
  export GOARM="7" # can be '5' as well, to use soft float instead of hardware
elif [ "$ARCH" = "aarch64" ]; then
  LIBDIRSUFFIX="64"
  GOARCH="arm64"
else
  LIBDIRSUFFIX=""
  GOARCH=386
fi

if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

set -e

rm -rf $PKG

CGO_MINOR_VERSION="$(/usr/bin/go version | awk '{ print $3 }' | sed 's/go//' | awk -F. '{ print $2 }')"
if [[ $CGO_MINOR_VERSION -lt 18 ]] ; then
  mkdir -p $TMP $PKG/usr/lib${LIBDIRSUFFIX}/go${BOOTSTRAP_VERSION} $OUTPUT
  cd $PKG/usr/lib${LIBDIRSUFFIX}/go${BOOTSTRAP_VERSION}
  tar xvf $CWD/go${BOOTSTRAP_VERSION}.src.tar.gz
  cd go
  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 \
   \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

  # as of >= go1.5, the cross-compiler does not need to be bootstrap, so the
  # compiler need only be compiled for the host OS, which it detects
  unset GOBIN GOPATH GOOS GOARCH

  # Not sure why, but this causes run.bash to fail --rworkman
  unset BASH_ENV

  # gcc 5+ is go1.4 API, so we'll bootstrap with it
  export GOROOT_BOOTSTRAP="/usr"

  # Default GOROOT is the parent directory of all.bash,
  # which is the current directory we're in.
  # Defining it here means we can use it below when building
  # shared libraries
  GOROOT="$(pwd)"
  export GOROOT

  # The value of GOROOT once the package is installed
  export GOROOT_FINAL="/usr/lib${LIBDIRSUFFIX}/go${BOOTSTRAP_VERSION}/go"

  case "$ARCH" in
    arm|i?86) export GOMAXPROCS=1 ;;
  esac

  cd src

  if [[ "${RUN_TEST}" = "true" ]] ; then
    LC_ALL=C \
      ./all.bash
  else
    LC_ALL=C \
      ./make.bash
  fi

  # As of go1.5, golang supports shared libraries, so generate them for use.
  $GOROOT/bin/go install -buildmode=shared std

  cd ..

  # remove Go build cache
  rm -rf pkg/obj/go-build/*

  # remove the doc Makefile
  rm -f doc/Makefile

  mkdir -p $PKG$GOROOT_FINAL
fi

mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/go${VERSION} $OUTPUT
cd $PKG/usr/lib${LIBDIRSUFFIX}/go${VERSION}
tar xvf $CWD/go${VERSION}.src.tar.gz
cd go
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 \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
 -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

# as of >= go1.5, the cross-compiler does not need to be bootstrap, so the
# compiler need only be compiled for the host OS, which it detects
unset GOBIN GOPATH GOOS GOARCH

# Not sure why, but this causes run.bash to fail --rworkman
unset BASH_ENV

# gcc 5+ is go1.4 API, so we'll bootstrap with it
if [[ $CGO_MINOR_VERSION -lt 18 ]] ; then
  export GOROOT_BOOTSTRAP="$PKG/usr/lib${LIBDIRSUFFIX}/go${BOOTSTRAP_VERSION}/go"
else
  export GOROOT_BOOTSTRAP="/usr"
fi

# Default GOROOT is the parent directory of all.bash,
# which is the current directory we're in.
# Defining it here means we can use it below when building
# shared libraries
GOROOT="$(pwd)"
export GOROOT

# The value of GOROOT once the package is installed
export GOROOT_FINAL="/usr/lib${LIBDIRSUFFIX}/go${VERSION}/go"

case "$ARCH" in
  arm|i?86) export GOMAXPROCS=1 ;;
esac

cd src

if [[ "${RUN_TEST}" = "true" ]] ; then
  LC_ALL=C \
    ./all.bash
else
  LC_ALL=C \
    ./make.bash
fi

# As of go1.5, golang supports shared libraries, so generate them for use.
$GOROOT/bin/go install -buildmode=shared std

find $PKG/$GOROOT_FINAL -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
find $PKG/$GOROOT_FINAL -type f -name "*.so" -exec chmod +x {} \; 2> /dev/null || true

cd ..

# remove Go build cache
rm -rf pkg/obj/go-build/*

# remove the doc Makefile
rm -f doc/Makefile

# remove tests, nothing needs these at runtime
find $PKG/$GOROOT_FINAL/src -type d -name "testdata" -exec rm -rf {} +
find $PKG/$GOROOT_FINAL/src -type f -name "*_test.go" -exec rm -rf {} +

mkdir -p $PKG$GOROOT_FINAL

# remove bootstrap
if [[ $CGO_MINOR_VERSION -lt 18 ]] ; then
  rm -rf $PKG/usr/lib$LIBDIRSUFFIX/go$BOOTSTRAP_VERSION
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
setenv 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 $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  CONTRIBUTING.md LICENSE PATENTS README.md SECURITY.md VERSION \
  $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE
