Update image to build for Python 3.8

Dockerfile

@@ -1,13 +1,10 @@
-FROM amazonlinux:2018.03
+FROM amazon/aws-lambda-python:3.8
 
 # Need to set "ulimit -n" to a small value to stop yum from hanging:
 # https://bugzilla.redhat.com/show_bug.cgi?id=1715254#c1
 RUN ulimit -n 1024 && yum -y update && yum -y install \
 	git \
 	gcc \
-	python36 \
-	python36-pip \
-	python36-devel \
 	jq \
 	nano \
 	unzip \
@@ -16,12 +13,11 @@ RUN ulimit -n 1024 && yum -y update && yum -y install \
 
 COPY requirements.txt quilt/requirements.txt
 
-RUN python3 -m pip install pip==18.1
-
 # Requirements copied from lambda Python 3.6, but not in base image
 # (Plus Cython which is a build-time requirement for numpy)
 RUN python3 -m pip install -r quilt/requirements.txt
 
 # Make it possible to build numpy:
 # https://github.com/numpy/numpy/issues/14147
 ENV CFLAGS=-std=c99
+

README.md

@@ -1,5 +1,9 @@
 # Build AWS Lambda deployment packages with Docker
 
+## Update
+Amazon now provides images for Lambda runtimes on Docker Hub.
+See [amazon/aws-lambda-python](https://hub.docker.com/r/amazon/aws-lambda-python).
+
 ## Blog post (includes tips on reducing package size)
 
 [An easier way to build AWS Lambda deployment packages — with Docker instead of EC2](https://blog.quiltdata.com/an-easier-way-to-build-lambda-deployment-packages-with-docker-instead-of-ec2-9050cd486ba8)
@@ -14,9 +18,13 @@ is clumsy
 linked from [this AWS user guide](https://docs.aws.amazon.com/AmazonECR/latest/userguide/amazon_linux_container_image.html))
 
 ## [Tags](https://hub.docker.com/r/quiltdata/lambda/tags)
-* `build` - introduced to build wheels per [#2](https://github.com/quiltdata/lambda/pull/2). In theory this should not affect how the environment functions, but in practice use image id `823205fae3ed` if you want to be as close to the official lambda environment as possible.
+* `build` - introduced to build wheels per [#2](https://github.com/quiltdata/lambda/pull/2).
+In theory this should not affect how the environment functions,
+but in practice use image id `823205fae3ed`
+if you want to be as close to the official lambda environment as possible.
+On 9/1/21 the `build` tag has been updated to support the Python3.8 runtime (only).
 
-## Example: Python 3.6 deployment package
+## Example: Python 3.8 deployment package
 
 ```sh
 docker pull quiltdata/lambda

requirements.txt

@@ -1,10 +1,10 @@
-# from `pip freeze` under Python 3.6 lambda image 16-Apr-2020
-boto3==1.12.22
-botocore==1.15.22
-Cython==0.29.21
-docutils==0.15.2
-jmespath==0.9.5
-python-dateutil==2.8.1
-s3transfer==0.3.3
-six==1.14.0
-urllib3==1.25.8
+# from `pip freeze` under Python 3.8 lambda image 01-Sep-2021
+boto3==1.17.100
+botocore==1.20.100
+Cython==0.29.24
+jmespath==0.10.0
+python-dateutil==2.8.2
+s3transfer==0.4.2
+six==1.16.0
+urllib3==1.26.6
+