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| zatm8 | Does anyone here tries to build Content Addressed binary cache? There was some experimental nixos cache, but it seems to be long dead. I would like to know current status of adopting Ca-derivations. | 19:30:21 |
 ajs124 | You mean https://github.com/zhaofengli/attic? | 19:34:29 |
| zatm8 | No, it's nix daemon feature rather then cache: https://nixos.wiki/wiki/Ca-derivations | 19:37:16 |
| zatm8 | I’ve been experimenting with integrating OTA updates with Nix’s local-overlay-store. The lower layer is the active A/B slot (a SquashFS image containing /nix/store), and the upper layer is a writable ext4 store used by containers. After a slot switch, a reconcile pass repairs the upper layer by downloading missing store paths. While working on this, I found that the same input-addressed store path can have different realisations on different hosts, so the narHash recorded in the lower-store DB could disagree with the bytes shipped in the image, causing nix copy to fail with a hash mismatch. CA-derivations fixed this class of issues for me, but I really don't know how many people using them and what's the status of this feature. | 19:51:44 |
| zatm8 | * No, it's nix daemon feature rather than cache: https://nixos.wiki/wiki/Ca-derivations | 19:59:14 |
| 2 Nov 2026 |
 Mic92 | zatm8: https://github.com/amber-store/jaccard-nfs-nix-store | 09:53:48 |
| Mic92 | ah wait, there is no special focus on CA derivations there. | 09:54:11 |
| Mic92 | but it also doesn't really need much to support content-addressed derivations in a binary cache. Both harmonia and niks3 support it | 09:54:33 |
| 4 Nov 2026 |
|  phanirithvij (loudgolem) changed their display name from phanirithvij/loudgolem to phanirithvij (loudgolem). | 07:16:46 |
| zatm8 | Was asking mainly for two reasons:
- maybe someone hosting with this feature and can tell how many packages are been broken. From the milestone I found out that IFD will broke the hashing for sure (quite obviously) and there're some bugs, but the feature is working (mostly).
- I really tied rebuilding whole universe every time i need to run tests for this project, maybe someone can share the cache, so I won't rebuild all the stuff.
| 23:58:10 |
| 6 Nov 2026 |
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