ccf55bead1
This is what I've suspected a while ago[1]: > Heads-up everyone: After testing this in a few production instances, > it seems that some browsers still get cache hits for new store paths > (and changed contents) for some reason. I highly suspect that it might > be due to the last-modified header (as mentioned in [2]). > > Going to test this with last-modified disabled for a little while and > if this is the case I think we should improve that patch by disabling > last-modified if serving from a store path. Much earlier[2] when I reviewed the patch, I wrote this: > Other than that, it looks good to me. > > However, I'm not sure what we should do with Last-Modified header. > From RFC 2616, section 13.3.4: > > - If both an entity tag and a Last-Modified value have been > provided by the origin server, SHOULD use both validators in > cache-conditional requests. This allows both HTTP/1.0 and > HTTP/1.1 caches to respond appropriately. > > I'm a bit nervous about the SHOULD here, as user agents in the wild > could possibly just use Last-Modified and use the cached content > instead. Unfortunately, I didn't pursue this any further back then because @pbogdan noted[3] the following: > Hmm, could they (assuming they are conforming): > > * If an entity tag has been provided by the origin server, MUST > use that entity tag in any cache-conditional request (using If- > Match or If-None-Match). Since running with this patch in some deployments, I found that both Firefox and Chrome/Chromium do NOT re-validate against the ETag if the Last-Modified header is still the same. So I wrote a small NixOS VM test with Geckodriver to have a test case which is closer to the real world and I indeed was able to reproduce this. Whether this is actually a bug in Chrome or Firefox is an entirely different issue and even IF it is the fault of the browsers and it is fixed at some point, we'd still need to handle this for older browser versions. Apart from clearing the header, I also recreated the patch by using a plain "git diff" with a small description on top. This should make it easier for future authors to work on that patch. [1]: https://github.com/NixOS/nixpkgs/pull/48337#issuecomment-495072764 [2]: https://github.com/NixOS/nixpkgs/pull/48337#issuecomment-451644084 [3]: https://github.com/NixOS/nixpkgs/pull/48337#issuecomment-451646135 Signed-off-by: aszlig <aszlig@nix.build> |
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Nixpkgs is a collection of over 40,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.
Manuals
- NixOS Manual - how to install, configure, and maintain a purely-functional Linux distribution
- Nixpkgs Manual - contributing to Nixpkgs and using programming-language-specific Nix expressions
- Nix Package Manager Manual - how to write Nix expresssions (programs), and how to use Nix command line tools
Community
Other Project Repositories
The sources of all offical Nix-related projects are in the NixOS organization on GitHub. Here are some of the main ones:
- Nix - the purely functional package manager
- NixOps - the tool to remotely deploy NixOS machines
- Nix RFCs - the formal process for making substantial changes to the community
- NixOS homepage - the NixOS.org website
- hydra - our continuous integration system
- NixOS Artwork - NixOS artwork
Continuous Integration and Distribution
Nixpkgs and NixOS are built and tested by our continuous integration system, Hydra.
- Continuous package builds for unstable/master
- Continuous package builds for the NixOS 19.09 release
- Tests for unstable/master
- Tests for the NixOS 19.09 release
Artifacts successfully built with Hydra are published to cache at https://cache.nixos.org/. When successful build and test criteria are met, the Nixpkgs expressions are distributed via Nix channels.
Contributing
Nixpkgs is among the most active projects on GitHub. While thousands of open issues and pull requests might seem a lot at first, it helps consider it in the context of the scope of the project. Nixpkgs describes how to build over 40,000 pieces of software and implements a Linux distribution. The GitHub Insights page gives a sense of the project activity.
Community contributions are always welcome through GitHub Issues and Pull Requests. When pull requests are made, our tooling automation bot, OfBorg will perform various checks to help ensure expression quality.
The Nixpkgs maintainers are people who have assigned themselves to maintain specific individual packages. We encourage people who care about a package to assign themselves as a maintainer. When a pull request is made against a package, OfBorg will notify the appropriate maintainer(s). The Nixpkgs committers are people who have been given permission to merge.
Most contributions are based on and merged into these branches:
masteris the main branch where all small contributions gostagingis branched from master, changes that have a big impact on Hydra builds go to this branchstaging-nextis branched from staging and only fixes to stabilize and security fixes with a big impact on Hydra builds should be contributed to this branch. This branch is merged into master when deemed of sufficiently high quality
For more information about contributing to the project, please visit the contributing page.
Donations
The infrastructure for NixOS and related projects is maintained by a nonprofit organization, the NixOS Foundation. To ensure the continuity and expansion of the NixOS infrastructure, we are looking for donations to our organization.
You can donate to the NixOS foundation by using Open Collective:
License
Nixpkgs is licensed under the MIT License.
Note: MIT license does not apply to the packages built by Nixpkgs, merely to the files in this repository (the Nix expressions, build scripts, NixOS modules, etc.). It also might not apply to patches included in Nixpkgs, which may be derivative works of the packages to which they apply. The aforementioned artifacts are all covered by the licenses of the respective packages.