#!/bin/bash

# Slackware build script for fscrypt

# Copyright 2025 Isaac Yu <isaacyu@protonmail.com>
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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

PRGNAM=fscrypt
VERSION=${VERSION:-0.3.5}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

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

if [ "$ARCH" = "i586" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  LIBDIRSUFFIX="64"
else
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION
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 {} \;

mkdir -p vendor
cat $CWD/modules.txt > vendor/modules.txt
for DIR in $(grep -o "^# .* " vendor/modules.txt | cut -d' ' -f2)
do
  NAME=$(echo $DIR | sed 's/[./]v[0-9]\+$//' | xargs basename)
  DIR=vendor/$DIR

  # Extract the tarball
  if [ $DIR = "vendor/github.com/urfave/cli" ]; then
    tar xvf $CWD/cli-1.22.14.tar.gz
  elif [ $DIR = "vendor/golang.org/x/exp/typeparams" ]; then
    tar xvf $CWD/exp-*.tar.gz
  else
    tar xvf $CWD/$NAME-*.tar.gz
  fi

  # Rename extracted folders
  mkdir -p $(dirname $DIR)
  if [ $DIR = "vendor/github.com/urfave/cli" ]; then
    mv cli-1.22.14 $DIR
  elif [ $DIR = "vendor/golang.org/x/exp/typeparams" ]; then
    mv exp-* $DIR
  else
    mv $NAME-* $DIR
  fi
done

# Make sure fscrypt uses the vendor directory for compilation
# It must not download anything during the build process
export GOFLAGS="-mod=vendor"

# Prevent creation of cache files in /root/.cache/go-build
export GOCACHE="${GOCACHE:-$TMP/$PRGNAM-$VERSION/go-cache}"
export GOMODCACHE="${GOMODCACHE:-$TMP/$PRGNAM-$VERSION/go}"

make
make install DESTDIR=$PKG PREFIX=/usr PAM_MODULE_DIR=/lib${LIBDIRSUFFIX}/security

# Allow fscrypt to check login passphrase when creating a login protector
install -Dm644 $CWD/pam_config $PKG/etc/pam.d/fscrypt

# Remove Ubuntu-specific PAM file
rm -r $PKG/usr/share/pam-configs

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a CODE_OF_CONDUCT.md CONTRIBUTING.md LICENSE NEWS.md README.md $PKG/usr/doc/$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