# Nix

**URL:** https://discourse.nixos.org/c/dev/nix/50.md

[Latest](https://discourse.nixos.org/latest.md) · [Categories](https://discourse.nixos.org/categories.md)

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## [About the Nix category](https://discourse.nixos.org/t/about-the-nix-category/22872)

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**Author:** [@ryantm](https://discourse.nixos.org/u/ryantm)\
**Replies:** 0

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(Replace this first paragraph with a brief description of your new category. This guidance will appear in the category selection area, so try to keep it below 200 characters.) Use the following paragraphs for a longer d…

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## [Rootless Nix Daemon](https://discourse.nixos.org/t/rootless-nix-daemon/79266)

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**Author:** [@artemist](https://discourse.nixos.org/u/artemist)\
**Replies:** 7\
**Last updated:** [August 20, 2026, 1:48pm UTC](https://discourse.nixos.org/t/rootless-nix-daemon/79266 "2026-08-20T13:48:37Z")

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We quietly implemented support for a rootless Nix daemon a few months ago, and I have just finished a post describing the challenges in a bit more detail. Thank you to the Nix Foundation and the Sovereign Tech Agency fo…

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## [Seeking community input on AI usage policy for Nix development](https://discourse.nixos.org/t/seeking-community-input-on-ai-usage-policy-for-nix-development/78230)

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**Author:** [@lisanna](https://discourse.nixos.org/u/lisanna)\
**Replies:** 2\
**Last updated:** [June 16, 2026, 11:18pm UTC](https://discourse.nixos.org/t/seeking-community-input-on-ai-usage-policy-for-nix-development/78230 "2026-06-16T23:18:15Z")

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The Nix team is currently considering an Automation/AI usage policy for development of Nix. You can find the PR for it here: Establish Automation/AI policy by lisanna-dettwyler · Pull Request #15984 · NixOS/nix · GitHub …

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## [Nix installer workgroup](https://discourse.nixos.org/t/nix-installer-workgroup/21495)

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**Author:** [@thufschmitt](https://discourse.nixos.org/u/thufschmitt)\
**Replies:** 36\
**Last updated:** [May 24, 2026, 12:08am UTC](https://discourse.nixos.org/t/nix-installer-workgroup/21495 "2026-05-24T00:08:35Z")

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Hi, As stated in our last update, we (Tweag) would like to do something to improve the situation with the Nix installation process. This can’t be just Tweag’s doing – If only because I, for one, have only a very faint …

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## [Appflowy Community Nix Module](https://discourse.nixos.org/t/appflowy-community-nix-module/66220)

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**Author:** [@TuotHash](https://discourse.nixos.org/u/TuotHash)\
**Replies:** 2\
**Last updated:** [February 12, 2026, 4:06pm UTC](https://discourse.nixos.org/t/appflowy-community-nix-module/66220 "2026-02-12T16:06:38Z")

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Hi, I would like to make a module, that makes it easier to host appflowy cloud using NixOS. I’ve managed to host appflowy using podman and compose2nix but I can see already, that I’ve lost some useful functionality for …

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## [Get size of /nix/store efficiently](https://discourse.nixos.org/t/get-size-of-nix-store-efficiently/51354)

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**Author:** [@iwanb](https://discourse.nixos.org/u/iwanb)\
**Replies:** 8\
**Last updated:** [January 29, 2026, 2:21pm UTC](https://discourse.nixos.org/t/get-size-of-nix-store-efficiently/51354 "2026-01-29T14:21:07Z")

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Hi, I’d like to know the size of the complete /nix/store to decide whether to do GC when it gets over a threshold. Currently I’m reading the nix DB to do that: sqlite3 'file:/nix/var/nix/db/db.sqlite?readonly=true&imm…

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## [A call for the Nix team to present a unified front on the outcome and strategy around Nix flakes](https://discourse.nixos.org/t/a-call-for-the-nix-team-to-present-a-unified-front-on-the-outcome-and-strategy-around-nix-flakes/54959)

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**Author:** [@grahamc](https://discourse.nixos.org/u/grahamc)\
**Replies:** 174\
**Last updated:** [January 19, 2026, 9:37pm UTC](https://discourse.nixos.org/t/a-call-for-the-nix-team-to-present-a-unified-front-on-the-outcome-and-strategy-around-nix-flakes/54959 "2026-01-19T21:37:12Z")

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Valentin, if you truly mean that – and I hope you don’t – then fine. If that is what it takes to get clarity for Nix’s users about the status of flakes, then please: rip the bandaid off and call it done. Determinate wil…

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## [Proposal for new experimental feature: resource management](https://discourse.nixos.org/t/proposal-for-new-experimental-feature-resource-management/73099)

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**Author:** [@lisanna](https://discourse.nixos.org/u/lisanna)\
**Replies:** 3\
**Last updated:** [December 10, 2025, 11:21pm UTC](https://discourse.nixos.org/t/proposal-for-new-experimental-feature-resource-management/73099 "2025-12-10T23:21:39Z")

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I have a new experimental feature proposal which could benefit from additional discussion. It modifies system features to make them consumable when a number is appended to them with a colon, in effect permitting lightwei…

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## [Nix copying a store-path into the store](https://discourse.nixos.org/t/nix-copying-a-store-path-into-the-store/60409)

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**Author:** [@zimward](https://discourse.nixos.org/u/zimward)\
**Replies:** 17\
**Last updated:** [December 3, 2025, 12:57am UTC](https://discourse.nixos.org/t/nix-copying-a-store-path-into-the-store/60409 "2025-12-03T00:57:03Z")

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I noticed some curious behavior of nix run after rebuilding the system from a flake. Specifically it spends some significant amount of time copying a store-path into the store (which from my understanding should result i…

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## [Associative function application in Nix lang](https://discourse.nixos.org/t/associative-function-application-in-nix-lang/71774)

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**Author:** [@UlyssesZhan](https://discourse.nixos.org/u/UlyssesZhan)\
**Replies:** 2\
**Last updated:** [November 5, 2025, 7:44pm UTC](https://discourse.nixos.org/t/associative-function-application-in-nix-lang/71774 "2025-11-05T19:44:16Z")

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In some languages (such as Ruby), function application is right associative: def half x x / 2 end half half half 16 # =\> 2 Whereas, function application in Nix is left associative. However, one can do this: let ma…

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## [Interactive program written in Nix lang](https://discourse.nixos.org/t/interactive-program-written-in-nix-lang/71536)

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**Author:** [@UlyssesZhan](https://discourse.nixos.org/u/UlyssesZhan)\
**Replies:** 5\
**Last updated:** [November 2, 2025, 7:53pm UTC](https://discourse.nixos.org/t/interactive-program-written-in-nix-lang/71536 "2025-11-02T19:53:10Z")

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I read this article about programming a tic-tac-toe game in Nix. The concept is interesting, but writing contents to a file as input and outputing to realized derivations is far from desired. However, I noticed that Lix …

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## [Developing a system that replaces nix remote build](https://discourse.nixos.org/t/developing-a-system-that-replaces-nix-remote-build/22388)

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**Author:** [@elaforge](https://discourse.nixos.org/u/elaforge)\
**Replies:** 23\
**Last updated:** [October 28, 2025, 5:26pm UTC](https://discourse.nixos.org/t/developing-a-system-that-replaces-nix-remote-build/22388 "2025-10-28T17:26:19Z")

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At my workplace, we use nix pretty extensively, and also as a “proper” per-file build system, with a large pool of builders (~80 VMs currently) and a global cache backed by Google Storage. This has caused us to run in…

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## [Flake.lock, duplicates and transitive dependencies - why?](https://discourse.nixos.org/t/flake-lock-duplicates-and-transitive-dependencies-why/71174)

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**Author:** [@ominous3405](https://discourse.nixos.org/u/ominous3405)\
**Replies:** 14\
**Last updated:** [October 23, 2025, 3:37pm UTC](https://discourse.nixos.org/t/flake-lock-duplicates-and-transitive-dependencies-why/71174 "2025-10-23T15:37:54Z")

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tl;dr flake dependency graphs get turned into trees unless you use .follows and I can’t figure out why, I also don’t know why flake.lock contains transitive dependencies Current behavior ▶ Diagram meaning Currently, flak…

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## [Ideas to fix flakes other than lazy trees?](https://discourse.nixos.org/t/ideas-to-fix-flakes-other-than-lazy-trees/70588)

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**Author:** [@tavin](https://discourse.nixos.org/u/tavin)\
**Replies:** 12\
**Last updated:** [October 10, 2025, 10:18pm UTC](https://discourse.nixos.org/t/ideas-to-fix-flakes-other-than-lazy-trees/70588 "2025-10-10T22:18:01Z")

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I am new to nix and in my research so far, I have seen various comments on flake design issues. Some of these could perhaps be addressed iteratively but it seems like the copying of local file trees to the store is the b…

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## [A way to remove string context](https://discourse.nixos.org/t/a-way-to-remove-string-context/70572)

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**Author:** [@UlyssesZhan](https://discourse.nixos.org/u/UlyssesZhan)\
**Replies:** 3\
**Last updated:** [October 8, 2025, 2:46pm UTC](https://discourse.nixos.org/t/a-way-to-remove-string-context/70572 "2025-10-08T14:46:45Z")

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The string context is the references in a string to derivations. For example, a derivation out path refers to the derivation, and thus any string that interpolates this out path refers to this derivation, too. This is us…

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## [Lix: mismatch in feature name compared to nix](https://discourse.nixos.org/t/lix-mismatch-in-feature-name-compared-to-nix/59879)

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**Author:** [@waffle8946](https://discourse.nixos.org/u/waffle8946)\
**Replies:** 10\
**Last updated:** [September 25, 2025, 1:13am UTC](https://discourse.nixos.org/t/lix-mismatch-in-feature-name-compared-to-nix/59879 "2025-09-25T01:13:10Z")

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Regarding RFC 148 - The feature is called "pipe-operators" in nix: but "pipe-operator" in lix: This makes it more of a hassle to test differences between, or freely switch between, lix and nix. CC @jade

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## [2025-09-17 Nix team meeting minutes #248](https://discourse.nixos.org/t/2025-09-17-nix-team-meeting-minutes-248/69508)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [September 17, 2025, 8:52pm UTC](https://discourse.nixos.org/t/2025-09-17-nix-team-meeting-minutes-248/69508 "2025-09-17T20:52:24Z")

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In the meanwhile, we’ve had some triage meetings whose outcomes were posted on the issues/prs, as well as some hacking sessions without notes. 2025-09-17 Nix team meeting minutes #248 Wednesday triage meeting Attendees…

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## [Implement float number truncation](https://discourse.nixos.org/t/implement-float-number-truncation/69396)

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**Author:** [@nicolas-goudry](https://discourse.nixos.org/u/nicolas-goudry)\
**Replies:** 2\
**Last updated:** [September 15, 2025, 10:22am UTC](https://discourse.nixos.org/t/implement-float-number-truncation/69396 "2025-09-15T10:22:31Z")

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Hi, I had to deal with float numbers in one of my Nix related projects and found out that float support in the Nix libraries (both builtin and from nixpkgs) is very limited. Same goes for integers but the support is sli…

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## [2025-08-25 Nix team meeting minutes #243](https://discourse.nixos.org/t/2025-08-25-nix-team-meeting-minutes-243/68497)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [August 25, 2025, 10:54pm UTC](https://discourse.nixos.org/t/2025-08-25-nix-team-meeting-minutes-243/68497 "2025-08-25T22:54:30Z")

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Monday hacking session Usually not the best notes, because we’re already hacking and multitasking, but that won’t stop us from posting what we did write down. You’re always welcome to join our meetings! Attendees: @ed…

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## [2025-08-20 Nix team meeting minutes #242,#241](https://discourse.nixos.org/t/2025-08-20-nix-team-meeting-minutes-242-241/68245)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [August 20, 2025, 8:26pm UTC](https://discourse.nixos.org/t/2025-08-20-nix-team-meeting-minutes-242-241/68245 "2025-08-20T20:26:35Z")

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2025-08-20 Nix team meeting minutes #242 Wednesday triage meeting Attendees: @edolstra @Mic92 @ericson2314 @roberth Triage Add \`nix flake prefetch-inputs\` command by edolstra · Pull Request #13565 · NixOS/nix · GitHub A…

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## [\[Release\] Valkyrie 0.0.1 – A code execution engine for workflows & LLMs](https://discourse.nixos.org/t/release-valkyrie-0-0-1-a-code-execution-engine-for-workflows-llms/68235)

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**Author:** [@Sujay-J-Reddy](https://discourse.nixos.org/u/Sujay-J-Reddy)\
**Replies:** 0\
**Last updated:** [August 20, 2025, 4:26pm UTC](https://discourse.nixos.org/t/release-valkyrie-0-0-1-a-code-execution-engine-for-workflows-llms/68235 "2025-08-20T16:26:40Z")

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Hey folks, We’ve just released Valkyrie 0.0.1, our code execution engine built for workflows and LLMs. This update makes it faster, more secure, and easier to use. Valkyrie lets you execute code in a secure, consistent…

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## [2025-08-06 Nix team meeting minutes #239,#240](https://discourse.nixos.org/t/2025-08-06-nix-team-meeting-minutes-239-240/67694)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 1\
**Last updated:** [August 6, 2025, 10:27pm UTC](https://discourse.nixos.org/t/2025-08-06-nix-team-meeting-minutes-239-240/67694 "2025-08-06T22:27:38Z")

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2025-08-06 Nix team meeting minutes #240 Wednesday triaging meeting Attendees: @edolstra @roberth @xokdvium @Mic92 @fzakaria Triage Add new primop \`builtins.fromJSONC\` which automatically strips comments from JSON by f…

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## [2025-07-30 Nix team meeting minutes #238](https://discourse.nixos.org/t/2025-07-30-nix-team-meeting-minutes-238/67400)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [July 30, 2025, 10:52pm UTC](https://discourse.nixos.org/t/2025-07-30-nix-team-meeting-minutes-238/67400 "2025-07-30T22:52:42Z")

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\#237 last Monday was a hacking session in which we didn’t take note worthy notes. Attendees: @xokdvium @Ericson2314 @edolstra @roberth @Mic92 Triage Call Git clean filter for files in workdir as needed · Issue #13464 ·…

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## [Getting started with optimizing the Nix project](https://discourse.nixos.org/t/getting-started-with-optimizing-the-nix-project/67342)

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**Author:** [@Mic92](https://discourse.nixos.org/u/Mic92)\
**Replies:** 1\
**Last updated:** [July 29, 2025, 3:09pm UTC](https://discourse.nixos.org/t/getting-started-with-optimizing-the-nix-project/67342 "2025-07-29T15:09:08Z")

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With the ever-growing Nixpkgs/NixOS project it becomes more and more important to optimize Nix to scale with rest of the project. I put together an guide on how to benchmark and profile Nix in a structured manner: add de…

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## [2025-07-23 Nix team meeting minutes #236](https://discourse.nixos.org/t/2025-07-23-nix-team-meeting-minutes-236/67114)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [July 23, 2025, 8:51pm UTC](https://discourse.nixos.org/t/2025-07-23-nix-team-meeting-minutes-236/67114 "2025-07-23T20:51:51Z")

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Wednesday triage session Attendees: @edolstra @roberth @xokdvium @Ericson2314 @tomberek @Mic92 @fzakaria Agenda Monday meeting time change? Can’t decide a single time slot. We’ll set up two: current time + extra even…

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## [2025-07-16 Nix team meeting minutes #235](https://discourse.nixos.org/t/2025-07-16-nix-team-meeting-minutes-235/66850)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [July 16, 2025, 10:48pm UTC](https://discourse.nixos.org/t/2025-07-16-nix-team-meeting-minutes-235/66850 "2025-07-16T22:48:14Z")

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Wednesday triage session No issue triage this time, but we discussed the survey and the 2.30 security incident. See our postmortem in the thread. Attendees: @edolstra @roberth @Mic92 @xokdvium @Ericson2314 @tomberek U…

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## [2023-07-03 Nix team meeting minutes #68](https://discourse.nixos.org/t/2023-07-03-nix-team-meeting-minutes-68/30337)

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**Author:** [@fricklerhandwerk](https://discourse.nixos.org/u/fricklerhandwerk)\
**Replies:** 2\
**Last updated:** [July 16, 2025, 10:15pm UTC](https://discourse.nixos.org/t/2023-07-03-nix-team-meeting-minutes-68/30337 "2025-07-16T22:15:48Z")

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Attendees: @edolstra @roberth @thufschmitt @fricklerhandwerk @ericson2314 Agenda Discuss architecture, responsibilities, delegation Update on Sovereign Tech Fund grant applications @fricklerhandwerk talked to a bunch…

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## [2025-07-09 Nix team meeting minutes #233](https://discourse.nixos.org/t/2025-07-09-nix-team-meeting-minutes-233/66474)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [July 9, 2025, 8:37pm UTC](https://discourse.nixos.org/t/2025-07-09-nix-team-meeting-minutes-233/66474 "2025-07-09T20:37:17Z")

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We had more of a freeform meeting, without notes the other day; sorry for the little hiatus. Wednesday triage session Attendees: @edolstra @tomberek @roberth @Mic92 @xokvdium Triage Incremental stabilization of JSON …

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## [2025-06-25 Nix team meeting minutes #232](https://discourse.nixos.org/t/2025-06-25-nix-team-meeting-minutes-232/66102)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [June 26, 2025, 9:03am UTC](https://discourse.nixos.org/t/2025-06-25-nix-team-meeting-minutes-232/66102 "2025-06-26T09:03:56Z")

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We’ve had a few meetings without notes due to discussions and prep for Tuesday’s security fix releases. Wednesday triage session Attendees: @tomberek @edolstra @roberth @xokvidium Triage warning: download buffer is fu…

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## [2025-06-11 Nix team meeting minutes #231](https://discourse.nixos.org/t/2025-06-11-nix-team-meeting-minutes-231/65543)

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**Author:** [@roberth](https://discourse.nixos.org/u/roberth)\
**Replies:** 0\
**Last updated:** [June 11, 2025, 8:23pm UTC](https://discourse.nixos.org/t/2025-06-11-nix-team-meeting-minutes-231/65543 "2025-06-11T20:23:43Z")

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2025-06-11 Nix team meeting minutes #231 Wednesday triage session Attendees: @edolstra @roberth @Ericson2314 @xokdvium @tomberek @edef Triage

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