Fixing Uv-lock Pre-commit Hook Failure On Pre-commit.ci

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Fixing uv-lock Pre-commit Hook Failure on pre-commit.ci

Introduction

Hey guys! Ever run into a snag while trying to automate your code checks? Today, we're diving into a common issue encountered when setting up the uv-lock pre-commit hook, specifically within a pre-commit.ci environment. We'll break down the problem, understand the error messages, and, most importantly, explore how to fix it. So, if you're scratching your head over a failed uv-lock hook, you're in the right place. Let's get started and make those commits smooth again!

Understanding the Issue: The uv-lock Pre-Commit Hook

So, you've decided to use the uv-lock pre-commit hook—smart move! This hook, part of the uv-pre-commit package from Astral.sh, is designed to help you manage your Python dependencies and ensure consistent environments. Basically, it's supposed to lock your dependencies so that everyone on your team is using the same versions, preventing those annoying "it works on my machine" situations. You add it to your .pre-commit-config.yaml file like this:

-   repo: https://github.com/astral-sh/uv-pre-commit
    rev: 0.9.6
    hooks:
    -   id: uv-lock

But what happens when things go south? You might encounter a failure during the pre-commit process, especially on platforms like pre-commit.ci. This is where the error messages start popping up, and it can feel like deciphering a secret code. The key is to understand what these messages are telling you. They usually point towards issues with downloading necessary components or resolving network addresses. Understanding these errors is the first step in getting your pre-commit hooks back on track. So, let's break down a typical error and see what we can learn from it.

Decoding the Error Message

Okay, let's get into the nitty-gritty. You've added the uv-lock hook, tried to commit, and bam! You're hit with an error message that looks something like this:

uv-lock..................................................................Failed
- hook id: uv-lock
- exit code: 2

error: Request failed after 3 retries
  Caused by: Failed to download https://github.com/astral-sh/python-build-standalone/releases/download/20250723/cpython-3.13.5%2B20250723-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz
  Caused by: error sending request for url (https://github.com/astral-sh/python-build-standalone/releases/download/20250723/cpython-3.13.5%2B20250723-x86_64-unknown-linux-gnu-install_only_stripped.tar.gz)
  Caused by: client error (Connect)
  Caused by: dns error
  Caused by: failed to lookup address information: Temporary failure in name resolution

Whoa, that's a mouthful! But don't worry, we'll break it down. The most important part is the root cause: failed to lookup address information: Temporary failure in name resolution. This error indicates a DNS resolution problem. DNS (Domain Name System) is like the internet's phonebook; it translates domain names (like github.com) into IP addresses that computers can understand. When you see this error, it means your system couldn't find the IP address for the given domain, in this case, a URL related to downloading a Python build.

The error message also mentions "Request failed after 3 retries," which tells us that the system tried to download the file multiple times before giving up. This is helpful because it rules out a transient network hiccup. The mention of python-build-standalone gives us a clue that the hook is trying to fetch a standalone Python distribution, which is necessary for creating an isolated environment. So, with all this information, we can start to narrow down the possible causes and solutions.

Common Causes and Solutions

Alright, so you've got the error message, and we've deciphered it. Now, let's talk about why this might be happening and, more importantly, how to fix it. This DNS resolution error can stem from a few different sources, but the good news is that most of them have straightforward solutions.

1. Network Connectivity Issues

First up, the most obvious culprit: network connectivity. Your machine might not be connected to the internet, or there could be a temporary outage. It happens! To check this:

  • Make sure you can access other websites. Try pinging a reliable domain like google.com or github.com from your terminal. If that fails, you've likely got a broader network issue to tackle.
  • If you're on a corporate network, there might be firewall rules or proxy settings interfering with the connection. This leads us to the next common cause.

2. DNS Resolution Problems

Sometimes, the issue isn't your internet connection itself, but rather your system's ability to translate domain names into IP addresses. Here’s what you can do:

  • Check your DNS settings: Your system might be using a DNS server that's experiencing problems. You can try switching to a public DNS server like Google's (8.8.8.8 and 8.8.4.4) or Cloudflare's (1.1.1.1). How you do this depends on your operating system, but a quick search for "change DNS settings on [your OS]" should give you the steps.
  • Flush your DNS cache: Your computer stores DNS lookups for a certain amount of time to speed things up, but sometimes this cache can become outdated or corrupted. You can clear it using commands like ipconfig /flushdns on Windows or sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder on macOS.

3. Firewall or Proxy Interference

Corporate networks often have firewalls and proxies to control internet access. These can sometimes block the pre-commit hook from downloading the necessary files.

  • Check your firewall settings: Make sure that your firewall isn't blocking outgoing connections to the URLs the hook is trying to access. You might need to add exceptions for these URLs.

  • Configure proxy settings: If you're behind a proxy, you'll need to tell pre-commit about it. You can do this by setting the http_proxy and https_proxy environment variables. For example:

    export http_proxy=http://your-proxy-server:your-proxy-port
export https_proxy=http://your-proxy-server:your-proxy-port

    Replace your-proxy-server and your-proxy-port with your actual proxy details.

4. Temporary Service Outages

Rare, but it happens! The server hosting the required files (in this case, likely a server related to Astral.sh or Python build standalones) might be temporarily down.

  • Wait and retry: If you've tried the other solutions and nothing seems to work, it's possible there's a temporary outage. Give it some time and try running the pre-commit hook again later.

Applying the Solutions in pre-commit.ci

Now, let's focus on how these solutions apply specifically within a pre-commit.ci environment. pre-commit.ci runs your pre-commit hooks in a remote environment, which means some of the solutions we discussed need a slightly different approach.

1. Network Configuration in pre-commit.ci

Since pre-commit.ci runs in a controlled environment, direct access to network settings is limited. However, if the issue stems from a general network problem within the pre-commit.ci infrastructure, it's usually temporary and resolves itself. Retrying the commit later is often the best first step.

2. DNS Resolution within the CI Environment

pre-commit.ci uses its own DNS resolvers. If there's a widespread DNS issue, it's something the pre-commit.ci team would need to address. Again, retrying the commit is a good initial response. However, if the problem persists, it's worth checking the pre-commit.ci status page or community forums for any reported issues.

3. Proxy Configuration for pre-commit.ci

If your project requires a proxy to access external resources, you'll need to configure this within the pre-commit.ci environment. This is typically done by setting environment variables in your .pre-commit-config.yaml file. Here’s how:

repos:
-   repo: https://github.com/astral-sh/uv-pre-commit
    rev: 0.9.6
    hooks:
    -   id: uv-lock
      additional_dependencies: []
      pass_filenames: false
      always_run: true
      environment:
        http_proxy: http://your-proxy-server:your-proxy-port
        https_proxy: http://your-proxy-server:your-proxy-port

Replace http://your-proxy-server:your-proxy-port with your actual proxy URL. This tells pre-commit.ci to use the specified proxy when running the uv-lock hook.

4. Addressing Temporary Outages

As mentioned earlier, temporary outages can occur. If you suspect this is the case, the simplest solution is to wait for a while and then retry your commit. pre-commit.ci has a retry mechanism, so it will automatically attempt the hook again. If the outage was the issue, the subsequent run should succeed.

Step-by-Step Troubleshooting Guide

Okay, let's boil this down to a practical, step-by-step guide you can follow when you encounter the uv-lock failure on pre-commit.ci. This way, you've got a clear path to resolution.

  1. Retry the Commit: The first and easiest step is to simply retry the commit. As we've discussed, many issues are transient and can resolve themselves on a subsequent run. pre-commit.ci has built-in retry logic, so it's always worth giving it another shot.
  2. Check Network Connectivity (Locally): Before diving deeper, ensure your local machine has a stable internet connection. Try accessing other websites or pinging github.com. This rules out any basic network issues on your end.
  3. Inspect DNS Settings (Locally): If your local network is fine, the problem might be DNS-related. Try flushing your local DNS cache and, if necessary, switch to a public DNS server like Google's (8.8.8.8) or Cloudflare's (1.1.1.1). This helps ensure you're using a reliable DNS resolver.
  4. Configure Proxy Settings (if applicable): If you're behind a proxy, make sure your proxy settings are correctly configured. Set the http_proxy and https_proxy environment variables in your local environment and, more importantly, within your .pre-commit-config.yaml for pre-commit.ci.
  5. Check pre-commit.ci Status: If the issue persists, check the pre-commit.ci status page or community forums. There might be ongoing incidents or maintenance affecting the service.
  6. Set Environment Variables in .pre-commit-config.yaml: For proxy settings or any other environment-specific configurations, ensure you've added the necessary environment variables to your .pre-commit-config.yaml file. This ensures the settings are applied within the pre-commit.ci environment.
  7. Wait and Retry (Again): If none of the above steps work, it's possible there's a temporary outage on the server hosting the required files. Give it some time—an hour or two—and then retry the commit. This often resolves the issue.

Preventing Future Issues

Prevention is always better than cure, right? So, let's talk about some steps you can take to minimize the chances of running into this uv-lock failure in the future. These tips will help you maintain a smoother pre-commit process and keep your development workflow humming.

1. Monitor Network Stability

Keep an eye on your network stability, especially if you're working in an environment with known connectivity issues. If you frequently experience network drops, consider using a more stable connection or investigating the cause of the instability.

2. Regularly Update Dependencies

While uv-lock is designed to manage dependencies, it's still a good practice to regularly update your dependencies. This ensures you're using the latest versions, which often include bug fixes and performance improvements. However, be sure to test updates in a controlled environment before deploying them to production.

3. Stay Informed About Service Status

Keep an eye on the status pages for services like pre-commit.ci and any related infrastructure. This can give you early warnings about potential issues and help you plan accordingly. Many services offer status updates via email or social media, so consider subscribing to these channels.

4. Implement Robust Error Handling

In your pre-commit hooks and other automated processes, implement robust error handling. This includes logging errors, retrying failed operations, and providing informative error messages. Good error handling can help you quickly identify and resolve issues, minimizing downtime and frustration.

5. Use a Reliable DNS Resolver

Stick with a reliable DNS resolver. Public DNS servers like Google's (8.8.8.8 and 8.8.4.4) and Cloudflare's (1.1.1.1) are generally very stable and performant. Using a reliable DNS resolver can prevent many DNS-related issues.

Conclusion

Alright, guys, we've covered a lot of ground! We started with a perplexing error message from a failed uv-lock pre-commit hook on pre-commit.ci, and we've worked our way through understanding the problem, diagnosing the causes, and implementing solutions. We've also looked at preventative measures to keep this issue from popping up again. The key takeaway here is that while these errors can seem daunting at first, breaking them down step by step makes them much more manageable. By understanding the underlying issues, like DNS resolution and network connectivity, you can tackle these problems with confidence. So, the next time you see that uv-lock error, don't panic! Just follow the steps we've outlined, and you'll be back to smooth commits in no time. Happy coding!