#!/bin/bash
#
# This script builds the RTEMS/SPARC cross-compiler and the
# Leon2/Leon3/NGMP BSPs.
#
# To have a reproducible setup, it would be prudent if you
# executed this script under a Debian jessie chroot,
# bootstrapped via the following:
#
#     mkdir /opt/jessie-chroot
#     debootstrap jessie /opt/jessie-chroot
#     mount -t proc none /opt/jessie-chroot/proc/
#     mount -t sysfs none /opt/jessie-chroot/sys/
#     mount -o bind /dev /opt/jessie-chroot/dev/
#     mount -o bind /dev/pts /opt/jessie-chroot/dev/pts/
#     chroot /opt/jessie-chroot
#     apt-get update
#     apt-get build-dep binutils gcc g++ gdb unzip git python2.7-dev pax
#
# Then chroot inside it and run this script:
#
#     chroot /opt/jessie-chroot
#     /path/to/build.rtems.4.12.sh


# Stop on any error
set -e

DATE=$(date +"%Y.%m.%d")
mkdir -p ~/rtems.build.logs
BUILD_LOG=~/rtems.build.logs/${DATE}.log
[ -f ${BUILD_LOG} ] && {
    echo "There's already a build log:"
    echo "    " ${BUILD_LOG}
    echo Remove it to continue.
    exit 1
}

# Record the output in $BUILD_LOG (see matching brace)
{
    # Begin by checking out the RTEMS Source Builder

    mkdir -p ~/development/rtems/src
    RSB=~/development/rtems/src/rtems-source-builder-${DATE}
    RTPREFIX=/opt/rtems-4.11-${DATE}
    rm -rf ${RTPREFIX}
    [ ! -d $RSB ] && {
        cd ~/development/rtems/src/
        git clone git://git.rtems.org/rtems-source-builder.git rtems-source-builder-${DATE}
    }
    cd $RSB

    # Get the 4.11 branch
    git checkout -f 4.11

    # Verify that we have all we need to build
    source-builder/sb-check

    # ESA's network is a pain ; PASV FTP is not allowed, so we basically fetched all the
    # tarballs and hardlink to them each time (so no FTP action is triggered)
    cd rtems
    [ ! -d sources ] && {
        mkdir -p sources
        cd sources
        cp -al /root/development/rtems/src/rtems-source-builder.working/rtems/sources/* .
        cd ..
        for i in config/tools/*cfg ; do
            cat "$i" | sed 's,ftp://ftp.gnu.org,http://ftp.gnu.org,;s,ftp://gcc.gnu.org,http://gcc.gnu.org,;' > "$i".new && mv "$i".new "$i"
        done
    }

    # Your network firewall may or may not be an issue at this point:
    # Many of the source tarballs needed by the RSB are fetched over
    # PASV-enabled FTP servers.
    #
    # If your network is like the one in ESA/ESTEC and this is forbidden,
    # you'll have to fetch these tarballs and hardlink to them each time
    # (so no FTP action is triggered by the RTEMS RSB builder).
    # The sed invocation below also replaces ftp: with http:
    # (since this needs no PASV port meddling - which some firewalls object to)
    #
    # This is the way I do it - adapt it according to your needs:
    #
    # [ ! -d sources ] && {
    #     mkdir -p sources
    #     cd sources
    #     cp -al ~/development/rtems/pkg_sources_cache/* .
    #     cd ..
    #     for i in config/tools/*cfg ; do
    #         cat "$i" | sed 's,ftp://ftp.gnu.org,http://ftp.gnu.org,;s,ftp://gcc.gnu.org,http://gcc.gnu.org,;' > "$i".new && mv "$i".new "$i"
    #     done
    # }

    # Build the cross compiling toolchain
    ../source-builder/sb-set-builder --log=stage1.log --prefix=${RTPREFIX} 4.11/rtems-sparc 

    # Add the cross compiler to the PATH
    export PATH=${RTPREFIX}/bin:$PATH
    cd ..

    # checkout RTEMS4.11 - avoid doing it twice :-)
    [ ! -d rtems-git ] && {
        git clone https://github.com/RTEMS/rtems.git rtems-git
        cd rtems-git
        git checkout -f 4.11
        cd ..
    }

    # Build RTEMS
    cd rtems-git
    ./bootstrap
    cd ..
    rm -rf build.${DATE}
    mkdir build.${DATE}
    cd build.${DATE}
    ../rtems-git/configure \
        --target=sparc-rtems4.11 --prefix=${RTPREFIX} \
        --enable-rtemsbsp="leon2 leon3 ngmp" --enable-posix \
        --enable-smp --enable-cxx --enable-networking --enable-experimental-smp
    make all
    make install
} |& tee ${BUILD_LOG}