set -eu

interactive_pkgs=libsdl2-dev

gem5=false

qemu=true

submodules='buildroot linux'

y=

while getopts gpqt OPT; do

case "$OPT" in

g)

gem5=true

;;

p)

submodules="${submodules} parsec-benchmark"

;;

q)

qemu=false

;;

t)

interactive_pkgs=

y=-y

;;

esac

shift $(($OPTIND - 1))

pkgs="\

if "$gem5"; then

pkgs="$pkgs \

command -v apt-get >/dev/null 2>&1 || {

cat <<EOF

exit 0

}

pkgs="$pkgs libelf-dev"

if [ -f /.dockerenv ]; then

# --jobs is not available in git 2.7.4 from Ubuntu 16.04.

gitjobs=

mysudo=

# https://askubuntu.com/questions/496549/error-you-must-put-some-source-uris-in-your-sources-list

sed -Ei 's/^# deb-src/deb-src/' /etc/apt/sources.list

y=-y

gitjobs="--jobs $(nproc)"

mysudo=sudo

$mysudo apt-get update $y

$mysudo apt-get install $y \

$pkgs \

$interactive_pkgs \

if "$qemu"; then

$mysudo apt-get build-dep $y qemu

if "$gem5"; then

# Generate graphs of config.ini under m5out.

pip install --user pydot

if "$qemu"; then

submodules="${submodules} qemu"

if "$gem5"; then

submodules="${submodules} gem5"

submodules="$(for submodule in ${submodules}; do printf "submodules/${submodule} "; done)"

(

set -e

# Shallow cloning saves a considerable amount of time, specially because of the linux kernel.

# However, git submodules are buggy as usual, and this is the best way I've found to get it done:

# https://stackoverflow.com/questions/2144406/git-shallow-submodules/47374702#47374702

# In particular:

# - `shallow = true` on the submodule has no effect for the non default educational branches of our submodules

# - QEMU's submodules point to commits that are neither under branches nor tags, and so `--shallow-submodules` fails

git submodule update --depth 1 $gitjobs --init -- ${submodules}

if "$qemu"; then

git -C submodules/qemu submodule update --init --recursive

fi

) &

wait $! || git submodule update --init --recursive -- $submodules