#!/bin/bash
# Version: 0.6.1
# Copyright (c) 2005-2022:
#   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
# Licensed under the terms of the GNU General Public License version 3.

########################################################################
# None of this section requires editing.                               #
# Scroll down to the "Begin section that will require editing" marker. #
########################################################################

# Silence shellcheck.
# shellcheck disable=SC2015,SC2174

# Functions.
check_installed() {
  # $1 = The package name to check is installed.

  [[ -z "$1" ]] && return 1
  printf "%s\\n" /var/lib/pkgtools/packages/* | grep -P "^/var/lib/pkgtools/packages/\Q$1\E-([^-]*)-([^-]*)-([^-]*)$" >/dev/null 2>&1
  return $?
}

die() {
  # $1 = The message to write to stderr on exit.

  printf "\\033[1;31;40m%s: %s\\033[0;39m\\n" "${0##*/}" "${1:-Abort}" >&2
  exit 1
}

# Make sure to be in the build directory.
# shellcheck disable=SC2164
cd "$(cd "${BASH_SOURCE[0]%/*}"; pwd -P)"

# Read global buildconf settings.
# shellcheck disable=SC1091
[[ -e ../buildconf ]] && {
  . ../buildconf 2>/dev/null || die "Error sourcing global buildconf"
}

# Package specific buildconf settings.
# shellcheck disable=SC2015,SC1090
[[ -e "./$(basename "${BASH_SOURCE[0]}" .SlackBuild).buildconf" ]] && . "./$(basename "${BASH_SOURCE[0]}" .SlackBuild).buildconf" 2>/dev/null || \
    die "Error sourcing package buildconf"

# Package storage path.
# Be safe and leave it in /tmp by default (can be overridden).
# shellcheck disable=SC2016
PKG_STORE='${PKG_STORE:-/tmp/pkg-store/$DIST_OS_ID$BUILD_LIBDIRSUFFIX-$DIST_OS_VERSION_ID}'

# Parse command line options.
while (( $# > 0 )); do
  if [[ "$1" =~ ^-(-)?f(orce)?$ ]]; then
    BUILD_FORCE=1
  elif [[ "$1" =~ ^-(-)?n(o-cleanup)?$ ]]; then
    BUILD_CLEANUP=0
  elif [[ "$1" =~ ^-(-)?v(ersion)?$ ]]; then
    printf "%s=\"%s\"\\n" "NAME" "$PKG_NAME"
    printf "%s=\"%s\"\\n" "VERSION" "$PKG_VERSION"
    printf "%s=\"%s\"\\n" "BUILD" "$PKG_BUILD$PKG_TAG"
    exit 0
  else
    printf "%s: %s: %s\\n" "${0##*/}" "Invalid option" "$1" >&2
    printf "%s: %s %s\\n" "Usage" "${0##*/}" "[[-f|--force]|[-n|--no-cleanup]|[-v|--version]]" >&2
    exit 1
  fi
  shift
done

# Pre-build checks.
(( ${BUILD_FORCE:-0} != 1 )) && {
  while read -r PKG; do
    check_installed "$PKG" && die "Conflicting package installed: $PKG"
  done < <(printf "%s\\n" "${BUILD_CONFLICTS[@]}")
  while read -r PKG; do
    check_installed "$PKG" || die "Required package not installed: $PKG"
  done < <(printf "%s\\n" "${BUILD_REQUIRES[@]}")
}

# Gather some system information.
# shellcheck disable=SC2046
declare DIST_OS_$(grep "^ID=" /etc/os-release)
# shellcheck disable=SC2046
declare DIST_OS_$(grep "^VERSION_ID=" /etc/os-release)
# Try to detect a 'current' build environment.
# shellcheck disable=SC2046
declare DIST_OS_$(grep "^VERSION_CODENAME=" /etc/os-release)
[[ "$DIST_OS_VERSION_CODENAME" == "current" ]] && DIST_OS_VERSION_ID="current"
unset DIST_OS_VERSION_CODENAME

# Build environment.
BUILD_WORKDIR="${BUILD_WORKDIR:-/tmp/pkg-build}"
BUILD_ROOT="$BUILD_WORKDIR/pkg-$PKG_NAME"
BUILD_PREFIX="${BUILD_PREFIX:-/opt}"
BUILD_ALTCC="${BUILD_ALTCC:-}"
BUILD_ALTCXX="${BUILD_ALTCXX:-}"
BUILD_NUMJOBS="${BUILD_NUMJOBS:-7}"
case "${BUILD_ARCH:=$(uname -m)}" in
  i[45]86)
    BUILD_CFLAGS="${BUILD_CFLAGS:--march="$BUILD_ARCH" -mtune=i586 -O2}"
    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
    PKG_ARCH="${PKG_ARCH:-$BUILD_ARCH}"
    ;;
  i686)
    BUILD_CFLAGS="${BUILD_CFLAGS:--march="$BUILD_ARCH" -mtune=pentium4 -O2}"
    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
    PKG_ARCH="${PKG_ARCH:-$BUILD_ARCH}"
    ;;
  x86_64|x86-64)
    BUILD_CFLAGS="${BUILD_CFLAGS:--march=x86-64-v2 -mtune=ivybridge -O2 -fPIC}"
    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
    BUILD_LIBDIRSUFFIX="64"
    PKG_ARCH="${PKG_ARCH:-x86_64}"
    ;;
  aarch64)
    BUILD_CFLAGS="${BUILD_CFLAGS:-O2 -fPIC}"
    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
    BUILD_LIBDIRSUFFIX="64"
    PKG_ARCH="${PKG_ARCH:-aarch64}"
    DIST_OS_VERSION_ID="slackwareaarch"
    ;;
  arm*)
    BUILD_CFLAGS="${BUILD_CFLAGS:-O2}"
    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
    PKG_ARCH="${PKG_ARCH:-arm}"
    DIST_OS_VERSION_ID="slackwarearm"
    ;;
  *)
    die "Unsupported build architecture: $BUILD_ARCH"
    ;;
esac

# Now all possible changes to variables in PKG_STORE are complete, expand out the embedded variables.
eval "$(declare -p PKG_STORE | sed -re 's/\\\$/$/g')"

# Sanity.
SRC_DIR="$(pwd)"
umask 0022
[[ ! -e "$BUILD_WORKDIR" ]] || mkdir -p -m 750 "$BUILD_WORKDIR" || die "Failed to create working directory"
rm -rf "$BUILD_ROOT" && mkdir -m 755 "$BUILD_ROOT" || die "Failed to clear build root"
[[ -n "${SRC_DIRNAMES[*]}" ]] && { rm -rf "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}" || die "Failed to clear source directories"; }

# Get sources if they aren't downloaded already.
[[ -n "${SRC_DOWNLOADS[*]}" ]] && {
  WGET="$(command -v wget)"
  I=0
  while read -r SRC; do
    [[ ! -e "${SRC_FILENAMES[$I]}" ]] && {
      [[ -z "$WGET" ]] && die "wget is required to download sources"
      "$WGET" -t 3 -c -T 30 -w 5 --retry-connrefused --retry-on-host-error --no-check-certificate --passive-ftp -O "${SRC_FILENAMES[$I]}" "$SRC" || \
          { rm "${SRC_FILENAMES[$I]}"; die "Failed to download source file: $SRC"; }
    }
    [[ "$(md5sum "${SRC_FILENAMES[$I]}" | cut -d' ' -f1)" != "${SRC_MD5SUMS[$I]}" ]] && die "md5sum verification failed: ${SRC_FILENAMES[$I]}"
    (( I++ ))
  done < <(printf "%s\\n" "${SRC_DOWNLOADS[@]}")
}

# Unpack sources.
while read -r SRC; do
  case "$SRC" in
    *.tar.?z|*.t?z)
      tar -xv -C "$BUILD_WORKDIR" -f "$SRC" || die "Failed to extract source: $SRC"
      ;;
    *.zip|*.ZIP)
      unzip -d "$BUILD_WORKDIR" "$SRC" || die "Failed to extract source: $SRC"
      ;;
    *)
      die "Un-handled source archive format: ${SRC##*.}"
      ;;
  esac
done < <(printf "%s\\n" "${SRC_FILENAMES[@]}")

# Fix any weird permissions on sources.
chown -R root:root "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}" && chmod -R go-w "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}" || \
    die "Failed to correct source directory permissions"

# Standard ./configure options.
CONFIGURE_OPTS=("${BUILD_ALTCC:+CC=\"$BUILD_ALTCC\"}" "${BUILD_ALTCXX:+CXX=\"$BUILD_ALTCXX\"}" "--prefix=\"$BUILD_PREFIX\""
    "--libdir=\"$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX\"" "--sysconfdir=\"/etc/$PKG_NAME\"" "--localstatedir=/var" "--mandir=\"$BUILD_PREFIX/man\""
    "--infodir=\"$BUILD_PREFIX/info\"" "--build=\"$PKG_ARCH-slackware-linux\"" "--enable-shared" "--disable-static")

# Process each of the sources.
for ((I = 0; I < ${#SRC_DIRNAMES[@]}; I++)); do
  # Be in the source directory.
  cd "$BUILD_WORKDIR/${SRC_DIRNAMES[$I]}" || die "Failed to change to source directory: $BUILD_WORKDIR/${SRC_DIRNAMES[$I]}"

  ############################################
  # Begin section that will require editing. #
  ############################################

  # Build each source in the array.
  case "$I" in
    0)
      # Patch before build.
      # zcat $SRC_DIR/patches/EDITME.diff.gz | patch -p0 || die "Source patching failed on: EDITME.diff.gz"

      # Configure.
      CFLAGS="$BUILD_CFLAGS" CXXFLAGS="$BUILD_CXXFLAGS" LDFLAGS="$BUILD_LDFLAGS" ./configure "${CONFIGURE_OPTS[@]}" \
          --docdir="$BUILD_PREFIX/doc/${SRC_FILENAMES[$I]%%.*}" EDITME || \
          die "Source ./configure failed: ${SRC_DIRNAMES[$I]}"

      # Build and install.
      make -j "$BUILD_NUMJOBS" "${BUILD_MAKEFLAGS[@]}" && make -j "$BUILD_NUMJOBS" "${BUILD_MAKEFLAGS[@]}" DESTDIR="$BUILD_ROOT" install || \
          die "Failed to build and install source: ${SRC_DIRNAMES[$I]}"

      # Package documentation.
      mkdir -p -m 755 "$BUILD_ROOT/$BUILD_PREFIX/doc/${SRC_FILENAMES[$I]%%.*}" && cp --parents EDITME \
          "$BUILD_ROOT/$BUILD_PREFIX/doc/${SRC_FILENAMES[$I]%%.*}" || die "Documentation copy failed: ${SRC_DIRNAMES[$I]}"
      ;;
    *)
      die "Un-handled source file - no build configuration"
      ;;
  esac
done

##################################################
# End of the only section that required editing. #
##################################################

# Set up for sed replacements.
SED_OPTS=("-e" "s:%BUILD_PREFIX%:$BUILD_PREFIX:g" "-e" "s:%BUILD_LIBDIR%:$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX:g" "-e" "s:%BUILD_ARCH%:$BUILD_ARCH:g"
    "-e" "s:%DIST_OS_ID%:$DIST_OS_ID:g" "-e" "s:%DIST_OS_VERSION_ID%:$DIST_OS_VERSION_ID:g" "-e" "s:%PKG_NAME%:$PKG_NAME:g"
    "-e" "s:%PKG_VERSION%:$PKG_VERSION:g" "-e" "s:%PKG_FILE_VERSION%:${PKG_VERSION//-/_}:g" "-e" "s:%PKG_ARCH%:$PKG_ARCH:g"
    "-e" "s:%PKG_BUILD%:$PKG_BUILD:g" "-e" "s:%PKG_TAG%:${PKG_TAG//-/_}:g" "-e" "s:%PKG_EXT%:$PKG_EXT:g")

# Add extra configuration/scripts.
for DIR in cron.d cron.hourly cron.daily cron.weekly cron.monthly default logrotate.d profile.d rc.d; do
  [[ -e "$SRC_DIR/$DIR" ]] && {
    mkdir -p -m 755 "$BUILD_ROOT/etc/$DIR" || die "Failed to create directory: /etc/$DIR"
    for FILE in "$SRC_DIR/$DIR"/*; do
      sed -r "${SED_OPTS[@]}" <"$FILE" >"$BUILD_ROOT/etc/$DIR/${FILE##*/}" && chmod --reference="$FILE" "$BUILD_ROOT/etc/$DIR/${FILE##*/}" || \
          die "Failed to copy $DIR/${FILE##*/} into package"
    done
  }
done

# Slackware packages don't ship with hardlinks (I don't know why...).
HARDLINKS="$(find "$BUILD_ROOT" -type f -links +1 | tr $'\n' ' ')"
[[ -n "$HARDLINKS" ]] && die "Found hardlinked files in package: $HARDLINKS"

# Strip binaries.
find "$BUILD_ROOT" -type f -exec file {} + | grep -E "ELF.*(executable|shared object)" | cut -d: -f1 | xargs -r strip --strip-unneeded || \
    die "Failed to stip object files"

# Move man and info pages if required.
for DIR in "$BUILD_ROOT/$BUILD_PREFIX/share/man" "$BUILD_ROOT/usr/share/man" "$BUILD_ROOT/$BUILD_PREFIX/share/info" "$BUILD_ROOT/usr/share/info"; do
  [[ -e "$DIR" ]] && {
    mkdir -p -m 755 "$BUILD_ROOT/$BUILD_PREFIX/${DIR##*/}" || die "Failed to create $BUILD_PREFIX/${DIR##*/} directory"
    mv "$DIR"/* "$BUILD_ROOT/$BUILD_PREFIX/${DIR##*/}" && rmdir "$DIR" || die "Failed to move $DIR to correct directory"
  }
done

# Handle man pages.
[[ -e "$BUILD_ROOT/$BUILD_PREFIX/man" ]] && {
  find "$BUILD_ROOT/$BUILD_PREFIX/man" -regextype posix-extended -type f -regex "^$BUILD_ROOT/$BUILD_PREFIX/man/([^/]*/)?man.*/.*\.[[:digit:]n]{1}[^.]*$" \
      -exec gzip -9 {} + || die "Failed to compress man pages"
  find "$BUILD_ROOT/$BUILD_PREFIX/man" -type l -printf 'if [[ -e "%h/%l.gz" ]]; then (cd "%h" && ln -sf "%l.gz" "%f.gz" && rm -f "%f") || \
      die "Failed to fix symlink: %f"; else die "Dangling symlink: %p"; fi\n' | bash || die "Man pages' symlinks correction failed"
}

# Compress and fix info pages.
[[ -e "$BUILD_ROOT/$BUILD_PREFIX/info" ]] && {
  rm -f "$BUILD_ROOT/$BUILD_PREFIX/info/dir"
  find "$BUILD_ROOT/$BUILD_PREFIX/info" -regextype posix-extended -type f -regex "^$BUILD_ROOT/$BUILD_PREFIX/info/.*(\.info){1}(-[[:digit:]]+)?$" \
      -exec gzip -9 {} + || die "Failed to compress info pages"
  find "$BUILD_ROOT/$BUILD_PREFIX/info" -type l -printf 'if [[ -e "%h/%l.gz" ]]; then (cd "%h" && ln -sf "%l.gz" "%f.gz" && rm -f "%f") || \
      die "Failed to fix symlink: %f"; else die "Dangling symlink: %p"; fi\n' | bash || die "Info pages' symlink correction failed"
}

# Fix paths for perl modules.
[[ -e "$BUILD_ROOT/$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX/perl5" ]] && {
  find "$BUILD_ROOT/$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX/perl5" -name .packlist -exec sed -ri -e "s:^$BUILD_ROOT::g" \
      -e "s:^($BUILD_PREFIX|/usr){1}/share:$BUILD_PREFIX:g" \
      -e "s:^$BUILD_PREFIX/man/([^/]*/)?(man.*)/(.*)\.([[:digit:]n]){1}([^.])*$:$BUILD_PREFIX/man/\1\2/\3\.\4\5\.gz:g" \
      -e "s:^$BUILD_PREFIX/info/(.*)(\.info){1}(-[[:digit:]]+)?$:$BUILD_PREFIX/info/\1\2\3.gz:g" {} + || die "Failed to modify incorrect perl paths"
  find "$BUILD_ROOT" -name perllocal.pod -exec rm -f {} +		# Should never fail
  # Note: These will fail if $BUILD_ROOT == /usr, but are required to clean left over directories from perllocal.pod removal.
  rmdir "$BUILD_ROOT/usr/lib$BUILD_LIBDIRSUFFIX/perl5" 2>/dev/null	# OK to fail
  rmdir "$BUILD_ROOT/usr/lib$BUILD_LIBDIRSUFFIX" 2>/dev/null		# OK to fail
  rmdir "$BUILD_ROOT/usr" 2>/dev/null					# OK to fail
}

# /opt/<package>{,-<version>} is a special case.
# Technically, the FHS requires everything in /opt to be contained in its own package directory,
# so - assuming this technicallity is in use - make symlinks into the standard /opt dirs.
[[ "$BUILD_PREFIX" =~ ^/opt/$PKG_NAME.* ]] && {
  (cd "$BUILD_ROOT/opt" &&
   for DIR in bin doc include info lib lib64 libexec man sbin share; do
     [[ -e "${BUILD_PREFIX##*/}/$DIR" ]] && { mkdir -m 755 "$DIR" && (cd "$DIR" && lndir -silent "../${BUILD_PREFIX##*/}/$DIR)") || exit 1; }
   done) || die "Failed to link /opt paths"
}

# Copy pkgtool special files into the package.
mkdir -m 755 "$BUILD_ROOT/install" || die "Failed to make /install directory"
for FILE in doinst.sh douninst.sh slack-{conflicts,desc,required,suggests}; do
  [[ -e "$SRC_DIR/$FILE" ]] && {
    sed -r -e '/(^#|^$|-handy-ruler-)/ d' "${SED_OPTS[@]}" <"$SRC_DIR/$FILE" >"$BUILD_ROOT/install/$FILE" || \
        die "Failed to copy in pkgtool special file: $FILE"
  }
done

# Build the package.
cd "$BUILD_ROOT" || die "Failed to cd to BUILD_ROOT to build package"
rm -f "$BUILD_WORKDIR/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}".*
makepkg -l y -p -c n --acls --xattrs "$BUILD_WORKDIR/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}.$PKG_EXT" || \
    die "Package creation failed"

# Clean up after ourselves.
(( ${BUILD_CLEANUP:-1} == 1 )) && rm -rf "$BUILD_ROOT" "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}"

# Move package to the store.
mkdir -p -m 755 "$PKG_STORE" && mv --backup=numbered "$BUILD_WORKDIR/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}.$PKG_EXT" \
    "$PKG_STORE" || die "Failed to move package to store - package left in $BUILD_WORKDIR"

printf "\\033[1;32;40m%s:\\n  %s\\033[0;39m\\n" "Package built and moved to store" \
    "$PKG_STORE/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}.$PKG_EXT"