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Nix Package Manager development

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For people hacking on Nix: https://github.com/NixOS/nix Nix maintainers can be reached here.184 Servers

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18 Oct 2025
@dramforever:matrix.orgdramforeverbut the point is no, it won't always be present locally15:28:55
@raboof:matrix.orgraboof right, you can, but I wondered if/when that happens in practice 15:30:58
@dramforever:matrix.orgdramforever --substitute-on-destination definitely happens in practice 15:32:11
@fzakaria:one.ems.hostfzakariaanyone want to pair/hack tonight?20:11:25
@fzakaria:one.ems.hostfzakaria

Question I was confused by Jeremy Fleischman (jfly) :

When calculating store-paths, Nix does "Hashing modulo fixed-output derivations" -- this makes sense since you want the store-path to be stable for multiple drvs for the FOD.

His question:
Can we replace all the inputDrvs with their store-path and also achieve the same thing?
(replace via the same massaging that we do for FODs)

20:54:21
@fzakaria:one.ems.hostfzakariaimage.png
Download image.png
21:04:07
@fzakaria:one.ems.hostfzakariaThe part we are confused about: B.drv may have many different A.drv ; That's OK because eventually A.drv is replaced with A.outPath... BUT C depends on B.drv ... wouldn't that path have changed since the contents of the drv can have N A.drv paths21:04:58
@jfly:matrix.orgJeremy Fleischman (jfly) My question is stronger than "can we?". I'm saying "mustn't we?" 21:42:26

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