Removal of Wheezy and Jessie (except LTS) from mirrors]

[jackwootton]

Files python-runtime/python-interpreter-builder/Dockerfile.in and python-runtime/runtime-image/Dockerfile.in mention that Google App Engine base image is debian:

# The Google App Engine base image is debian (jessie) with ca-certificates
# installed.

On March 20th 2019 the removal of Wheezy and Jessie (except LTS) from mirrors was announced. Now, when building a Docker image FROM gcr.io/google_appengine/python:latest, the build fails with:

: Ign http://httpredir.debian.org jessie InRelease
: Get:1 http://httpredir.debian.org jessie-updates InRelease [6572 B]
: Get:2 http://security.debian.org jessie/updates InRelease [44.2 kB]
: Get:3 http://httpredir.debian.org jessie Release.gpg [2420 B]
: Get:4 http://httpredir.debian.org jessie Release [148 kB]
: Get:5 http://httpredir.debian.org jessie/main amd64 Packages [9098 kB]
: Get:6 http://security.debian.org jessie/updates/main amd64 Packages [866 kB]
: W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/InRelease
: Unable to find expected entry 'main/binary-amd64/Packages' in Release file
: Wrong sources.list entry or malformed file
: E: Some index files failed to download. They have been ignored, or old ones used instead.

Some more information on https://unix.stackexchange.com/a/508728