3ce87d1fcb
Fixes #8252 With @bmw we digged quite a lot on why the failure happens on ARM snap, and here we what we understood: * the failure occurs since the version 50 of setuptools is available * normally, we should not be impacted because the setuptools version used in the snap build should be the one installed by the `core20` base snap, because the build occurs in a `venv` created with `--system-site-packages` * BUT associated with the build isolation provided by recent versions of pip (to implement PEP 517), a bad interaction happens: following the definition of the build system provided by `cryptography`, pip installs the most recent version of setuptools on a separate path for the build (because `cryptography` just asks for a minimal version of `setuptools`), then features of this version conflict with the old version of `setuptools` initially present * the exact interaction is described here: https://github.com/pypa/pip/issues/6264#issuecomment-685230919. Basically the new version of `setuptools` triggers some hacks, that are then applied at runtime on the old version of `setuptools` that is also still available in `sys.path` at this point, and breaks the build. To fix that, one can disable the isolation build on cryptography, by passing `PIP_NO_ISOLATION_BUILD=no` to pip. It is the purpose of this PR. This will have the consequence to not be PEP 517 compliant: if needed the `cryptography` library will be built using the `setuptools` available in the system. In general I think it makes sense for the snap build purpose, since we control precisely the build environment, and makes consistent build that will not be broken by a new version of a build system if library maintainers did not provide a strict version of it in their build requirements. However we need now to take care about having a compatible build system for all libraries that may have specific requirements in their build system using the PEP 517 definition in `pyproject.toml`. I think as of now that it is a safe move if we keep using the most recent version of `setuptools` available in Ubuntu 20.04, and it is the case here for snap builds. It may however be problematic if some libraries require another build system than `setuptools` and do not provide a fallback to a `setuptools` build. For the record, `dns-lexicon`, that I maintain, uses `poetry` and so a PEP 517 compliant definition of a build system, but provides also this fallback (https://github.com/AnalogJ/lexicon/blob/master/setup.py). Full test suite compiling the snaps for the 3 architectures using this PR is available here: https://dev.azure.com/certbot/certbot/_build/results?buildId=2596&view=results
Certbot is part of EFF’s effort to encrypt the entire Internet. Secure communication over the Web relies on HTTPS, which requires the use of a digital certificate that lets browsers verify the identity of web servers (e.g., is that really google.com?). Web servers obtain their certificates from trusted third parties called certificate authorities (CAs). Certbot is an easy-to-use client that fetches a certificate from Let’s Encrypt—an open certificate authority launched by the EFF, Mozilla, and others—and deploys it to a web server.
Anyone who has gone through the trouble of setting up a secure website knows what a hassle getting and maintaining a certificate is. Certbot and Let’s Encrypt can automate away the pain and let you turn on and manage HTTPS with simple commands. Using Certbot and Let's Encrypt is free, so there’s no need to arrange payment.
How you use Certbot depends on the configuration of your web server. The best way to get started is to use our interactive guide. It generates instructions based on your configuration settings. In most cases, you’ll need root or administrator access to your web server to run Certbot.
Certbot is meant to be run directly on your web server, not on your personal computer. If you’re using a hosted service and don’t have direct access to your web server, you might not be able to use Certbot. Check with your hosting provider for documentation about uploading certificates or using certificates issued by Let’s Encrypt.
Certbot is a fully-featured, extensible client for the Let's Encrypt CA (or any other CA that speaks the ACME protocol) that can automate the tasks of obtaining certificates and configuring webservers to use them. This client runs on Unix-based operating systems.
To see the changes made to Certbot between versions please refer to our changelog.
Until May 2016, Certbot was named simply letsencrypt or
letsencrypt-auto, depending on install method. Instructions
on the Internet, and some pieces of the software, may still refer to
this older name.
Contributing
If you'd like to contribute to this project please read Developer Guide.
This project is governed by EFF's Public Projects Code of Conduct.
How to run the client
The easiest way to install and run Certbot is by visiting certbot.eff.org, where you can find the correct instructions for many web server and OS combinations. For more information, see Get Certbot.
Understanding the client in more depth
To understand what the client is doing in detail, it's important to understand the way it uses plugins. Please see the explanation of plugins in the User Guide.
Links
Documentation: https://certbot.eff.org/docs
Software project: https://github.com/certbot/certbot
Notes for developers: https://certbot.eff.org/docs/contributing.html
Main Website: https://certbot.eff.org
Let's Encrypt Website: https://letsencrypt.org
Community: https://community.letsencrypt.org
ACME spec: http://ietf-wg-acme.github.io/acme/
ACME working area in github: https://github.com/ietf-wg-acme/acme
System Requirements
See https://certbot.eff.org/docs/install.html#system-requirements.
Current Features
- Supports multiple web servers:
- apache/2.x
- nginx/0.8.48+
- webroot (adds files to webroot directories in order to prove control of domains and obtain certs)
- standalone (runs its own simple webserver to prove you control a domain)
- other server software via third party plugins
- The private key is generated locally on your system.
- Can talk to the Let's Encrypt CA or optionally to other ACME compliant services.
- Can get domain-validated (DV) certificates.
- Can revoke certificates.
- Adjustable RSA key bit-length (2048 (default), 4096, ...).
- Can optionally install a http -> https redirect, so your site effectively runs https only (Apache only)
- Fully automated.
- Configuration changes are logged and can be reverted.
- Supports an interactive text UI, or can be driven entirely from the command line.
- Free and Open Source Software, made with Python.
For extensive documentation on using and contributing to Certbot, go to https://certbot.eff.org/docs. If you would like to contribute to the project or run the latest code from git, you should read our developer guide.