#!/bin/bash
# Copyright (c) 2012 The Native Client Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This script is intended to build a mipsel-linux-gnu cross compilation
# toolchain that runs on x86 linux and generates code for a little-endian,
# hard-float, mips32 target.

######################################################################
# Config
######################################################################

set -o nounset
set -o errexit

readonly SCRIPT_DIR=$(dirname $0)

readonly MAKE_OPTS="-j8"
readonly ARCH="mips32"

readonly GMP_URL="http://ftp.gnu.org/gnu/gmp/gmp-6.1.1.tar.bz2"
readonly GMP_SHA1SUM="757d672e66d8e0afe60ca04735ab11c00d9346e4"

readonly MPFR_URL="http://ftp.gnu.org/gnu/mpfr/mpfr-3.1.4.tar.bz2"
readonly MPFR_SHA1SUM="e3b0af77f18505184410d621fe0aae179e229dba"

readonly MPC_URL="http://ftp.gnu.org/gnu/mpc/mpc-1.0.3.tar.gz"
readonly MPC_SHA1SUM="b8be66396c726fdc36ebb0f692ed8a8cca3bcc66"

readonly GCC_URL="http://ftp.gnu.org/gnu/gcc/gcc-4.9.0/gcc-4.9.0.tar.bz2"
readonly GCC_SHA1SUM="fbde8eb49f2b9e6961a870887cf7337d31cd4917"

readonly BINUTILS_URL="http://ftp.gnu.org/gnu/binutils/binutils-2.26.tar.bz2"
readonly BINUTILS_SHA1SUM="a637508cffeb2323b14bc8dd65378819768ad4ff"

readonly KERNEL_URL="http://www.linux-mips.org/pub/linux/mips/kernel/v3.x/linux-3.18.3.tar.gz"
readonly KERNEL_SHA1SUM="66c390838cc3401135be534135fe72813e92378b"

readonly GLIBC_URL="http://ftp.gnu.org/gnu/glibc/glibc-2.19.tar.bz2"
readonly GLIBC_SHA1SUM="382f4438a7321dc29ea1a3da8e7852d2c2b3208c"

readonly INSTALL_ROOT=$(pwd)/toolchain/linux_x86/mips_trusted

readonly TMP=$(pwd)/toolchain/tmp/crosstool-trusted

readonly BUILD_DIR=${TMP}/build

readonly JAIL_MIPS32=${INSTALL_ROOT}/sysroot

readonly CROSS_TARBALL="mipsel_toolchain_sysroot"

######################################################################
# Helper
######################################################################

Banner() {
  echo "######################################################################"
  echo $*
  echo "######################################################################"
}

SubBanner() {
  echo "......................................................................"
  echo $*
  echo "......................................................................"
}

Usage() {
  echo
  echo "$0"
  echo
}

DownloadOrCopy() {
  local url=$1
  local filename="${TMP}/${url##*/}"
  local filetype="${url%%:*}"

  if [ "${filename}" == "" ]; then
    echo "Unknown error occured. Aborting."
    exit 1
  fi

  if [[ "${filetype}" ==  "http" || ${filetype} ==  "https" ]] ; then
    if [ ! -f "${filename}" ]; then
      SubBanner "downloading from ${url} -> ${filename}"
      wget ${url} -O ${filename}
    fi
  else
    SubBanner "copying from ${url}"
    cp ${url} ${filename}
  fi
}

DownloadOrCopyAndVerify() {
  local url=$1
  local checksum=$2
  local filename="${TMP}/${url##*/}"
  local filetype="${url%%:*}"

  if [ "${filename}" == "" ]; then
    echo "Unknown error occured. Aborting."
    exit 1
  fi

  if [[ "${filetype}" ==  "http" || ${filetype} ==  "https" ]] ; then
    if [ ! -f "${filename}" ]; then
      SubBanner "downloading from ${url} -> ${filename}"
      wget ${url} -O ${filename}
    fi
    if [ "${checksum}" != "nochecksum" ]; then
      if [ "$(sha1sum ${filename} | cut -d ' ' -f 1)" != "${checksum}" ]; then
        echo "${filename} sha1sum failed. Deleting file and aborting."
        rm -f ${filename}
        exit 1
      fi
    fi
  else
    SubBanner "copying from ${url}"
    cp ${url} ${filename}
  fi
}

######################################################################
#
######################################################################

# Some sanity checks to make sure this script is run from the right place
# with the right tools.
SanityCheck() {
  Banner "Sanity Checks"

  if ! mkdir -p "${INSTALL_ROOT}" ; then
     echo "ERROR: ${INSTALL_ROOT} can't be created."
    exit -1
  fi

  for tool in wget ; do
    if ! which ${tool} ; then
      echo "Required binary $tool not found."
      echo "Exiting."
      exit 1
    fi
  done
}

ClearInstallDir() {
  Banner "clearing dirs in ${INSTALL_ROOT}"
  rm -rf ${INSTALL_ROOT}/*
  mkdir -p ${JAIL_MIPS32}
}

ClearBuildDir() {
  Banner "clearing dirs in ${BUILD_DIR}"
  rm -rf ${BUILD_DIR}/*
}

CreateTarBall() {
  local tarball=$1
  Banner "creating tar ball ${tarball}"
  tar cfz ${tarball}.tgz -C ${INSTALL_ROOT} .
}

# Download the toolchain source tarballs or use a local copy when available.
DownloadOrCopyAndInstallToolchain() {
  Banner "Installing toolchain"

  tarball="${TMP}/${GCC_URL##*/}"
  DownloadOrCopyAndVerify ${GCC_URL} ${GCC_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar jxf ${tarball} -C ${TMP}

  pushd ${TMP}/gcc-*

  local tarball="${TMP}/${GMP_URL##*/}"
  DownloadOrCopyAndVerify ${GMP_URL} ${GMP_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar jxf ${tarball}
  local filename=`ls | grep gmp\-`
  rm -f gmp
  ln -s ${filename} gmp
  # Fix gmp configure problem with flex.
  sed -i "s/m4-not-needed/m4/" gmp/configure

  local tarball="${TMP}/${MPFR_URL##*/}"
  DownloadOrCopyAndVerify ${MPFR_URL} ${MPFR_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar jxf ${tarball}
  local filename=`ls | grep mpfr\-`
  rm -f mpfr
  ln -s ${filename} mpfr

  local tarball="${TMP}/${MPC_URL##*/}"
  DownloadOrCopyAndVerify ${MPC_URL} ${MPC_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar zxf ${tarball}
  local filename=`ls | grep mpc\-`
  rm -f mpc
  ln -s ${filename} mpc

  popd

  local tarball="${TMP}/${BINUTILS_URL##*/}"
  DownloadOrCopyAndVerify ${BINUTILS_URL} ${BINUTILS_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar jxf ${tarball} -C ${TMP}

  tarball="${TMP}/${KERNEL_URL##*/}"
  DownloadOrCopyAndVerify ${KERNEL_URL} ${KERNEL_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar zxf ${tarball} -C ${TMP}

  tarball="${TMP}/${GLIBC_URL##*/}"
  DownloadOrCopyAndVerify ${GLIBC_URL} ${GLIBC_SHA1SUM}
  SubBanner "extracting from ${tarball}"
  tar jxf ${tarball} -C ${TMP}

  Banner "Preparing the code"

  # Fix a minor syntax issue in tc-mips.c.
  local OLD_TEXT="as_warn_where (fragp->fr_file, fragp->fr_line, msg);"
  local NEW_TEXT="as_warn_where (fragp->fr_file, fragp->fr_line, \"%s\", msg);"
  local FILE_NAME="${TMP}/binutils-2.26/gas/config/tc-mips.c"
  sed -i "s/${OLD_TEXT}/${NEW_TEXT}/g" "${FILE_NAME}"

  export PATH=${INSTALL_ROOT}/bin:$PATH

  Banner "Building binutils"

  rm -rf ${BUILD_DIR}/binutils/
  mkdir -p ${BUILD_DIR}/binutils/
  pushd ${BUILD_DIR}/binutils/

  SubBanner "Configuring"
  ${TMP}/binutils-2.26/configure \
    --prefix=${INSTALL_ROOT}     \
    --target=mipsel-linux-gnu    \
    --with-sysroot=${JAIL_MIPS32}

  SubBanner "Make"
  make ${MAKE_OPTS} all-binutils all-gas all-ld

  SubBanner "Install"
  make ${MAKE_OPTS} install-binutils install-gas install-ld

  popd

  Banner "Building GCC (initial)"

  rm -rf ${BUILD_DIR}/gcc/initial
  mkdir -p ${BUILD_DIR}/gcc/initial
  pushd ${BUILD_DIR}/gcc/initial

  SubBanner "Configuring"
  ${TMP}/gcc-4.9.0/configure \
    --prefix=${INSTALL_ROOT} \
    --disable-libssp         \
    --disable-libgomp        \
    --disable-libmudflap     \
    --disable-fixed-point    \
    --disable-decimal-float  \
    --with-mips-plt          \
    --with-endian=little     \
    --with-arch=${ARCH}      \
    --enable-languages=c     \
    --with-newlib            \
    --without-headers        \
    --disable-shared         \
    --disable-threads        \
    --disable-libquadmath    \
    --disable-libatomic      \
    --target=mipsel-linux-gnu

  SubBanner "Make"
  make ${MAKE_OPTS} all

  SubBanner "Install"
  make ${MAKE_OPTS} install

  popd

  Banner "Installing Linux kernel headers"
  pushd ${TMP}/linux-3.18.3
  make headers_install ARCH=mips INSTALL_HDR_PATH=${JAIL_MIPS32}/usr
  popd

  Banner "Building GLIBC"

  rm -rf ${BUILD_DIR}/glibc/final
  mkdir -p ${BUILD_DIR}/glibc/final
  pushd ${BUILD_DIR}/glibc/final

  BUILD_CC=gcc                      \
  AR=mipsel-linux-gnu-ar            \
  RANLIB=mipsel-linux-gnu-ranlibi   \
  CC=mipsel-linux-gnu-gcc           \
  CXX=mipsel-linux-gnu-g++          \
  ${TMP}/glibc-2.19/configure       \
    --prefix=/usr                   \
    --enable-add-ons                \
    --host=mipsel-linux-gnu         \
    --disable-profile               \
    --without-gd                    \
    --without-cvs                   \
    --build=i686-pc-linux-gnu       \
    --with-headers=${JAIL_MIPS32}/usr/include

  SubBanner "Make"
  make ${MAKE_OPTS} all

  SubBanner "Install"
  make ${MAKE_OPTS} install install_root=${JAIL_MIPS32}

  popd

  Banner "Building GCC (final)"

  rm -rf ${BUILD_DIR}/gcc/final
  mkdir -p ${BUILD_DIR}/gcc/final
  pushd ${BUILD_DIR}/gcc/final

  ${TMP}/gcc-4.9.0/configure  \
    --prefix=${INSTALL_ROOT}  \
    --disable-libssp          \
    --disable-libgomp         \
    --disable-libmudflap      \
    --disable-fixed-point     \
    --disable-decimal-float   \
    --with-mips-plt           \
    --with-endian=little      \
    --with-arch=${ARCH}       \
    --target=mipsel-linux-gnu \
    --enable-__cxa_atexit     \
    --enable-languages=c,c++  \
    --with-sysroot=${JAIL_MIPS32}

  SubBanner "Make"
  make ${MAKE_OPTS} all

  SubBanner "Install"
  make ${MAKE_OPTS} install

  popd
}

# ----------------------------------------------------------------------
# mips32 deb files to complete our code sourcery jail
# ----------------------------------------------------------------------
readonly REPO_DEBIAN=http://ftp.debian.org/debian
readonly MIPS32_PACKAGES=${REPO_DEBIAN}/dists/jessie/main/binary-mipsel/Packages.xz

readonly BASE_PACKAGELIST_MIPS32=${SCRIPT_DIR}/packagelist.jessie.mipsel.base
readonly EXTRA_PACKAGELIST_MIPS32=${SCRIPT_DIR}/packagelist.jessie.mipsel.extra
readonly TMP_BASE_PKG_MIPS32=${TMP}/packagelist.generated.jessie.mipsel.base
readonly TMP_EXTRA_PKG_MIPS32=${TMP}/packagelist.generated.jessie.mipsel.extra

GeneratePackageLists() {
  local packages=
  local TMP_PACKAGELIST=
  Banner "Generating Cobalt package lists for mips32"
  rm -f ${TMP}/Packages.bz2
  DownloadOrCopy ${MIPS32_PACKAGES}
  xzcat ${TMP}/Packages.xz\
    | egrep '^(Package:|Filename:)' > ${TMP}/Packages_mipsel

  echo -n > ${TMP_EXTRA_PKG_MIPS32}
  TMP_PACKAGELIST=${TMP_EXTRA_PKG_MIPS32}
  packages=$(cat ${EXTRA_PACKAGELIST_MIPS32})

  for pkg in ${packages} ; do
    echo ${pkg}
    grep  -A 1 "${pkg}\$" ${TMP}/Packages_mipsel\
      | egrep -o "pool/.*" >> ${TMP_PACKAGELIST}
  done
}

InstallMissingLibraries() {
  local DEP_FILES_NEEDED_MIPS32=

  DEP_FILES_NEEDED_MIPS32=$(cat ${TMP_EXTRA_PKG_MIPS32})

  for file in ${DEP_FILES_NEEDED_MIPS32} ; do
    local package="${TMP}/${file##*/}"
    Banner "installing ${file}"
    DownloadOrCopy ${REPO_DEBIAN}/${file}
    SubBanner "extracting to ${JAIL_MIPS32}"
    dpkg --fsys-tarfile ${package}\
      | tar -xvf - -C ${JAIL_MIPS32}
  done
}

# Workaround for missing headers since pkg-config is not working correctly.
FixIncludes() {
  Banner "Fixing includes"
  pushd ${JAIL_MIPS32}/usr/include/glib-2.0
    ln -s ../../lib/glib-2.0/include/glibconfig.h .
  popd

  pushd ${JAIL_MIPS32}/usr/include/gtk-2.0
    ln -s ../../lib/gtk-2.0/include/gdkconfig.h .
  popd

  pushd ${JAIL_MIPS32}/usr/include/dbus-1.0/dbus
    ln -s ../../../lib/dbus-1.0/include/dbus/dbus-arch-deps.h .
  popd

  pushd ${JAIL_MIPS32}/usr/include
    cp ./mipsel-linux-gnu/sys/* ./sys/
    mkdir -p bits
    cp ./mipsel-linux-gnu/bits/* ./bits/
    mkdir -p gnu
    cp ./mipsel-linux-gnu/gnu/* ./gnu/
    mkdir -p asm
    cp ./mipsel-linux-gnu/asm/* ./asm/
    cp ./mipsel-linux-gnu/openssl/* ./openssl/
  popd
}

FixLinks() {
  Banner "Fixing links"
  pushd ${JAIL_MIPS32}/lib/
    mv mipsel-linux-gnu/* .
    rm -rf mipsel-linux-gnu
    ln -s . mipsel-linux-gnu
  popd

  pushd ${JAIL_MIPS32}/usr/lib/
    mkdir -p pkgconfig
    mv mipsel-linux-gnu/pkgconfig/* pkgconfig/
    rm -rf mipsel-linux-gnu/pkgconfig
    cp -r mipsel-linux-gnu/* .
    rm -rf mipsel-linux-gnu
    ln -s . mipsel-linux-gnu
  popd

  mkdir -p ${JAIL_MIPS32}/usr/share

  pushd ${JAIL_MIPS32}/usr/share/
    mkdir -p pkgconfig
  popd

  pushd ${JAIL_MIPS32}/usr/lib/
    rm -f libgcc_s.so*
    ln -s ../../../mipsel-linux-gnu/lib/libgcc_s.so.1 .
    ln -s libgcc_s.so.1 libgcc_s.so
  popd
}

FixLibs() {
  Banner "Fixing libraries"

  readonly liblist="libanl.co       \
                    libBrokenLocale.so \
                    libbz2.so       \
                    libcap.so       \
                    libcidn.so      \
                    libcom_err.so   \
                    libcrypt.so     \
                    libdbus-1.so    \
                    libdl.so        \
                    libexpat.so     \
                    libglib-2.0.so  \
                    libgpg-error.so \
                    libkeyutils.so  \
                    libnsl.so       \
                    libnss_compat.so\
                    libnss_dns.so   \
                    libnss_files.so \
                    libnss_hesiod.so\
                    libnss_nisplus.so\
                    libnss_nis.so   \
                    libpamc.so      \
                    libpam_misc.so  \
                    libpam.so       \
                    libpci.so       \
                    libpcre.so      \
                    libpng12.so     \
                    libresolv.so    \
                    librt.so        \
                    libthread_db.so \
                    libutil.so      \
                    libudev.so      \
                    libz.so"
  readonly liblist2="libpng12.so.0"

  pushd ${JAIL_MIPS32}/usr/lib/
    for library in ${liblist}; do
      rm -f ${library}
      ln -s ../../lib/${library}.[0123] ${library}
    done
    for library2 in ${liblist2}; do
      rm -f ${library2}
      ln -s ../../lib/${library2} ${library2}
    done
    rm -f libpython2.7.a
    ln -s ./python2.7/config-mipsel-linux-gnu/libpython2.7.a libpython2.7.a
    rm -f libm.so
    ln -s ../../lib/libm.so.6 libm.so
  popd
}

######################################################################
# Main
######################################################################

mkdir -p ${TMP}
SanityCheck
ClearInstallDir
ClearBuildDir
DownloadOrCopyAndInstallToolchain
GeneratePackageLists
InstallMissingLibraries
FixLinks
FixLibs
FixIncludes
CreateTarBall ${CROSS_TARBALL}