Iris as an AWS Lambda layer

build.sh

#/bin/bash

sudo rm -r opt
sudo rm -r task
mkdir task
cp container-build.sh task/
docker run -v /home/ec2-user/opt:/opt -v /home/ec2-user/task:/var/task -it lambci/lambda:build-python3.7 /bin/bash container-build.sh
pushd opt
zip -r9 ../iris-layer.zip *
popd

container-build.sh

#/bin/bash

set -x

cd /tmp

yum install -y wget jq

# Jump-start with NumPy and SciPy from AWS
LAYER_ARN=$(aws lambda get-function --function-name test --region eu-west-2 | jq --raw-output .Configuration.Layers[0].Arn)
DOWNLOAD_URL=$(aws lambda get-layer-version-by-arn --arn "$LAYER_ARN" --region eu-west-2 | jq --raw-output .Content.Location)
wget -O layer.zip "$DOWNLOAD_URL"
unzip -d /opt layer.zip

# Easy pip installable dependencies
export PYTHONPATH=/opt/python/lib/python3.7/site-packages:$PYTHONPATH
export share=/opt/python/lib/python3.7/site-packages
pip install --no-deps --no-compile -t $share cftime netCDF4 dask toolz

# PyKE
wget -O pyke.zip http://download.sourceforge.net/pyke/pyke3-1.1.1.zip
unzip pyke.zip
pushd pyke-1.1.1
python setup.py install --install-lib=$share
popd

# expat
wget -O expat.tar.bz2 https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.bz2
bunzip2 expat.tar.bz2
tar xvf expat.tar
pushd expat-2.2.9
./configure --prefix=/opt
make install
popd

# UDUNITS-2
wget -O udunits.tar.gz https://github.com/Unidata/UDUNITS-2/archive/v2.2.27.6.tar.gz
tar xzvf udunits.tar.gz
pushd UDUNITS-2-2.2.27.6
autoreconf -vfi
./configure --prefix=/opt
make install
popd

# cf-units
export CPPFLAGS=-I/opt/include
export LDFLAGS=-L/opt/lib
pip install --no-deps --no-compile -t $share cf-units

# Fake Cartopy
mkdir $share/cartopy
touch $share/cartopy/__init__.py
touch $share/cartopy/crs.py
touch $share/cartopy/img_transform.py

# Iris!
wget -O iris.tar.gz https://github.com/SciTools/iris/archive/v2.3.0.tar.gz
tar xzvf iris.tar.gz
pushd iris-2.3.0
pip install --no-deps --no-compile -t $share .
popd
rm -r $share/iris/tests

# Tidy up unwanted files
find /opt | grep '\.pyc$' | xargs rm
rm -r /opt/include
rm -r /opt/share/doc