# ubuntu:
# prepare old (trusty or earlier) host system:
# sudo ln -s gutsy /usr/share/debootstrap/scripts/artful
# sudo ln -s gutsy /usr/share/debootstrap/scripts/bionic
# build ubuntu:
# sudo DIST=trusty pbuilder create --configfile debian/.pbuilderrc && DIST=trusty pdebuild --configfile debian/.pbuilderrc
# sudo DIST=xenial pbuilder create --configfile debian/.pbuilderrc && DIST=xenial pdebuild --configfile debian/.pbuilderrc
# sudo DIST=zesty  pbuilder create --configfile debian/.pbuilderrc && DIST=zesty  pdebuild --configfile debian/.pbuilderrc
# sudo DIST=artful pbuilder create --configfile debian/.pbuilderrc && DIST=artful pdebuild --configfile debian/.pbuilderrc
# sudo DIST=bionic pbuilder create --configfile debian/.pbuilderrc && DIST=bionic pdebuild --configfile debian/.pbuilderrc
# sudo DIST=devel  pbuilder create --configfile debian/.pbuilderrc && DIST=devel  pdebuild --configfile debian/.pbuilderrc
# build debian:
# sudo DIST=stable       pbuilder create --configfile debian/.pbuilderrc && DIST=stable       pdebuild --configfile debian/.pbuilderrc
# sudo DIST=testing      pbuilder create --configfile debian/.pbuilderrc && DIST=testing      pdebuild --configfile debian/.pbuilderrc
# sudo DIST=unstable     pbuilder create --configfile debian/.pbuilderrc && DIST=unstable     pdebuild --configfile debian/.pbuilderrc
# sudo DIST=experimental pbuilder create --configfile debian/.pbuilderrc && DIST=experimental pdebuild --configfile debian/.pbuilderrc
# build i386 experimental:
# sudo DIST=trusty       ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=trusty       ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=xenial       ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=xenial       ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=zesty        ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=zesty        ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=artful       ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=artful       ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=bionic       ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=bionic       ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=stable       ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=stable       ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=testing      ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=testing      ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# sudo DIST=experimental ARCH=i386 pbuilder create --configfile debian/.pbuilderrc && DIST=experimental ARCH=i386 pdebuild --configfile debian/.pbuilderrc
# with embedded compiler (only artful have clang-5.0):
# env EXTRAPACKAGES="liblld-5.0-dev libclang-5.0-dev liblld-5.0" CMAKE_FLAGS="-DUSE_EMBEDDED_COMPILER=1" DIST=artful pdebuild --configfile debian/.pbuilderrc
# use only clang:
# env DEB_CC=clang-5.0 DEB_CXX=clang++-5.0 env EXTRAPACKAGES="liblld-5.0 liblld-5.0-dev libclang-5.0-dev clang-5.0" CMAKE_FLAGS="-DNO_WERROR=1 -DUSE_EMBEDDED_COMPILER=1" DIST=artful pdebuild --configfile debian/.pbuilderrc

# Your packages built here: /var/cache/pbuilder/*-*/result

# from https://wiki.debian.org/PbuilderTricks :

# Codenames for Debian suites according to their alias. Update these when
# needed.
UNSTABLE_CODENAME="sid"
TESTING_CODENAME="buster"
STABLE_CODENAME="stretch"
STABLE_BACKPORTS_SUITE="$STABLE_CODENAME-backports"

# List of Debian suites.
DEBIAN_SUITES=($UNSTABLE_CODENAME $TESTING_CODENAME $STABLE_CODENAME $STABLE_BACKPORTS_SUITE
    "experimental" "unstable" "testing" "stable")

# List of Ubuntu suites. Update these when needed.
UBUNTU_SUITES=("bionic" "artful" "zesty" "xenial" "trusty" "devel")

# Mirrors to use. Update these to your preferred mirror.
DEBIAN_MIRROR="deb.debian.org"
#UBUNTU_MIRROR="mirrors.kernel.org"

UBUNTU_MIRROR="mirror.yandex.ru"
#DEBIAN_MIRROR="mirror.yandex.ru"

# Set a default distribution if none is used. Note that you can set your own default (i.e. ${DIST:="unstable"}).
: ${DIST:="$(lsb_release --short --codename)"}

# Optionally change Debian codenames in $DIST to their aliases.
case "$DIST" in
    $UNSTABLE_CODENAME)
        DIST="unstable"
        ;;
    $TESTING_CODENAME)
        DIST="testing"
        ;;
    $STABLE_CODENAME)
        DIST="stable"
        ;;
esac

# Optionally set the architecture to the host architecture if none set. Note
# that you can set your own default (i.e. ${ARCH:="i386"}).
: ${ARCH:="$(dpkg --print-architecture)"}

NAME="$DIST"
if [ -n "${ARCH}" ]; then
    NAME="$NAME-$ARCH"
    DEBOOTSTRAPOPTS=("--arch" "$ARCH" "${DEBOOTSTRAPOPTS[@]}")
fi

BASETGZ="/var/cache/pbuilder/$NAME-base.tgz"
DISTRIBUTION="$DIST"
BUILDRESULT="/var/cache/pbuilder/$NAME/result/"
APTCACHE="/var/cache/pbuilder/$NAME/aptcache/"
BUILDPLACE="/var/cache/pbuilder/build/"

if $(echo ${DEBIAN_SUITES[@]} | grep -q $DIST); then
    # Debian configuration
    OSNAME=debian
    MIRRORSITE="http://$DEBIAN_MIRROR/$OSNAME/"
    COMPONENTS="main contrib non-free"
    if $(echo "$STABLE_CODENAME stable" | grep -q $DIST); then
        OTHERMIRROR="$OTHERMIRROR | deb $MIRRORSITE $STABLE_BACKPORTS_SUITE $COMPONENTS"
    fi
    # APTKEYRINGS=/usr/share/keyrings/debian-archive-keyring.gpg
    # sudo apt install debian-archive-keyring
    DEBOOTSTRAPOPTS+=( '--keyring' '/usr/share/keyrings/debian-archive-keyring.gpg' )
elif $(echo ${UBUNTU_SUITES[@]} | grep -q $DIST); then
    # Ubuntu configuration
    OSNAME=ubuntu
    MIRRORSITE="http://$UBUNTU_MIRROR/$OSNAME/"
    COMPONENTS="main restricted universe multiverse"

    OTHERMIRROR+="deb $MIRRORSITE $DIST-updates main restricted universe multiverse |"
    OTHERMIRROR+="deb $MIRRORSITE $DIST-security main restricted universe multiverse |"

    case "$DIST" in
       "trusty" | "xenial" )
           OTHERMIRROR+="deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/$OSNAME $DIST main |"
           ALLOWUNTRUSTED=yes
           ;;
    esac

    # deb http://apt.llvm.org/zesty/ llvm-toolchain-zesty-5.0 main
else
    echo "Unknown distribution: $DIST"
    exit 1
fi

echo "using $NAME $OSNAME $DIST $ARCH $LOGNAME"

case "$DIST" in
    "trusty")
        # ccache broken
        ;;
    *)
        CCACHEDIR=/var/cache/pbuilder/ccache
        ;;
esac

case "$DIST" in
    "trusty" | "xenial" | "experimental" | "unstable" )
        export DEB_CC=gcc-7
        export DEB_CXX=g++-7
        ;;
esac

export CCACHE_PREFIX=

export DEB_BUILD_OPTIONS=parallel=`nproc`

# Floating bug with permissions:
sudo mkdir -p /var/cache/pbuilder/ccache
sudo chmod -R a+rwx /var/cache/pbuilder/ccache

# echo "DEBOOTSTRAPOPTS = ${DEBOOTSTRAPOPTS[@]}"

# Use current dir to make package (by default should have src archive)
# echo "3.0 (native)" > debian/source/format
# OR
# pdebuild --debbuildopts "--source-option=--format=\"3.0 (native)\""
# OR
DEBBUILDOPTS="--source-option=--format=\"3.0 (native)\""