[PR #492] [MERGED] [DOCKER] Fix failing docker build on arm due to cryptography trying to build rust #976

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opened 2026-02-26 00:30:18 +03:00 by kerem · 0 comments

kerem commented

2026-02-26 00:30:18 +03:00

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📋 Pull Request Information

Original PR: https://github.com/healthchecks/healthchecks/pull/492
Author: @chevalier-m
Created: 3/11/2021
Status: ✅ Merged
Merged: 3/11/2021
Merged by: @cuu508

Base: master ← Head: master

📝 Commits (1)

431f37f [DOCKER] Fix failing build on armhf, due to cryptography lib trying to build rust

📊 Changes

1 file changed (+1 additions, -0 deletions)

View changed files

📝 docker/Dockerfile (+1 -0)

📄 Description

Build on my raspberry pi 4 (armhf) was failing due to the cryptography python package trying to build Rust dependency. Find below a snippet taken from the build logs:

  running build_rust
  
      =============================DEBUG ASSISTANCE=============================
      If you are seeing a compilation error please try the following steps to
      successfully install cryptography:
      1) Upgrade to the latest pip and try again. This will fix errors for most
         users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
      2) Read https://cryptography.io/en/latest/installation.html for specific
         instructions for your platform.
      3) Check our frequently asked questions for more information:
         https://cryptography.io/en/latest/faq.html
      4) Ensure you have a recent Rust toolchain installed:
         https://cryptography.io/en/latest/installation.html#rust
      5) If you are experiencing issues with Rust for *this release only* you may
         set the environment variable `CRYPTOGRAPHY_DONT_BUILD_RUST=1`.
      =============================DEBUG ASSISTANCE=============================
  
  error: can't find Rust compiler
  
  If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.
  
  To update pip, run:
  
      pip install --upgrade pip
  
  and then retry package installation.
  
  If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain.
  
  This package requires Rust >=1.41.0.
  ----------------------------------------
  ERROR: Failed building wheel for cryptography

My fix is greatly (to say the least) inspired by https://github.com/docker/compose/issues/8105#issuecomment-775879420 . It consists simply of adding ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1 in the Dockerfile prior to the pip installation.

I don't think that the Rust dependency was ever used in this project, so it shouldn't impact the vast majority of users.
I also believe, that if someone needs it, he probably created his own Dockerfile to handle his scenarios.

I have it confirmed working on both my armhf and my amd64 machines.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/healthchecks/healthchecks/pull/492 **Author:** [@chevalier-m](https://github.com/chevalier-m) **Created:** 3/11/2021 **Status:** ✅ Merged **Merged:** 3/11/2021 **Merged by:** [@cuu508](https://github.com/cuu508) **Base:** `master` ← **Head:** `master` --- ### 📝 Commits (1) - [`431f37f`](https://github.com/healthchecks/healthchecks/commit/431f37fb7db972523234aa5d73c9ba02161d92de) [DOCKER] Fix failing build on armhf, due to cryptography lib trying to build rust ### 📊 Changes **1 file changed** (+1 additions, -0 deletions) <details> <summary>View changed files</summary> 📝 `docker/Dockerfile` (+1 -0) </details> ### 📄 Description Build on my raspberry pi 4 (`armhf`) was failing due to the cryptography python package trying to build Rust dependency. Find below a snippet taken from the build logs: ``` running build_rust =============================DEBUG ASSISTANCE============================= If you are seeing a compilation error please try the following steps to successfully install cryptography: 1) Upgrade to the latest pip and try again. This will fix errors for most users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip 2) Read https://cryptography.io/en/latest/installation.html for specific instructions for your platform. 3) Check our frequently asked questions for more information: https://cryptography.io/en/latest/faq.html 4) Ensure you have a recent Rust toolchain installed: https://cryptography.io/en/latest/installation.html#rust 5) If you are experiencing issues with Rust for *this release only* you may set the environment variable `CRYPTOGRAPHY_DONT_BUILD_RUST=1`. =============================DEBUG ASSISTANCE============================= error: can't find Rust compiler If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler. To update pip, run: pip install --upgrade pip and then retry package installation. If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain. This package requires Rust >=1.41.0. ---------------------------------------- ERROR: Failed building wheel for cryptography ``` My fix is greatly (to say the least) inspired by https://github.com/docker/compose/issues/8105#issuecomment-775879420 . It consists simply of adding `ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1` in the `Dockerfile` prior to the pip installation. I don't think that the Rust dependency was ever used in this project, so it shouldn't impact the vast majority of users. I also believe, that if someone needs it, he probably created his own Dockerfile to handle his scenarios. I have it confirmed working on both my `armhf` and my `amd64` machines. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>