| 12 Jan 2026 |
 n8henrie | Hi all -- anybody doing much bare-metal embedded work with nix + rust?
I'm a novice and just learning for fun, but can't seem to get a build to succeed due to multiple conflicting dependencies for build-std for an attiny85. Builds and runs on my aarch64-darwin machine outside of nix, just trying to see if I can get it to work in nix as well (via oxalica/rust-overlay).
For my prior ESP32C3 projects, I know that build-std often requires adding some additional dependencies that are not needed when building outside of nix tooling; I've previously added these to the dev requirements.
Unfortunately in this case, I'm finding that both wasi = "0.14.4" and wasi = "0.11.0" are required, and obviously I can't list both.
Does anyone know of a workaround for this? It looks like naersk may have support for an "additional" Cargo.lock, but I'd rather not learn a new pattern if there is a way to accomplish this with standard nix tooling (and oxalica for nightly).
Thanks for any suggestions!
My WIP: https://github.com/n8henrie/attiny85-relay/tree/nix
| 22:46:08 |
 emily | you can probably lockFileContents = builtins.readFile ./Cargo.lock + '' … ''; | 23:08:02 |
| emily | you could also consider just setting a cargoHash rather than importing the lock file directly | 23:08:14 |
| emily | (but ofc will have to update it on every lock file change) | 23:08:19 |
| emily | cc Toma who might have other ideas | 23:08:28 |
| emily | (fwiw, I wouldn't use naersk these days, crane might be worth a look though) | 23:10:21 |
| 13 Jan 2026 |
| n8henrie | Setting lockFileContents results in a complaint about cargoHash:
> ERROR: cargoHash or cargoSha256 is out of date
>
> Cargo.lock is not the same in /nix/var/nix/builds/nix-24411-1007667852/cargo-vendor-dir
Setting cargoHash = "" doesn't change the error?
Will tinker more, and will look into crane -- thanks!
| 00:29:59 |
| emily | I mean you can skip all the cargoLock, Git hashes, etc. stuff and just specify cargoHash = ""; and then fill in the hash it gives (I think?) | 00:30:28 |
| emily | unless build-std messes with that, which is… possible | 00:30:33 |
| n8henrie | Was hoping to avoid the "update every time the lock file changes" issue you mentioned. Figure the nightly version is locked so the deps required for build-std should be static (?). Maybe I misunderstood your comment though. | 00:41:17 |
 eveeifyeve | Did anyone look into this. | 10:42:27 |
| eveeifyeve | * Did anyone look into this? | 10:50:50 |
| 14 Jan 2026 |
|  jaen changed their profile picture. | 11:59:58 |
 Diego Reis | hey guys, I'm having a hard time to build a rust project with tikv-jemalloc-sys, does anybody else faced it before? | 18:10:31 |
 K900 | Don't we literally have a hook for that | 18:14:06 |
| Diego Reis | can you link it? I'm quite new into nix/nixos | 18:19:10 |
| Diego Reis | tbh not even know what a hook is on nix | 18:19:34 |
 loudgolem | rust-jemalloc-sys and rust-jemalloc-sys-unprefixed. Look for usages of these in nixpkgs | 18:34:10 |
| Diego Reis | amazing! Thank you | 18:44:52 |
| Diego Reis | gotta study more | 18:45:04 |
|  ttraj joined the room. | 22:47:23 |
| 15 Jan 2026 |
|  bivsk joined the room. | 00:37:38 |
| bivsk | Hello! I'm trying to package a rust program, however one of the dependent crates is failing to build due to a missing patch. This is my package.nix: https://bpa.st/LQWQ
I'm getting the error: Error: "Error applying patch '/build/tari-5.2.0-vendor/libtor-src-47.13.0+0.4.7.13/patches/libevent-0001-libevent-makefile.patch': \"Os { code: 2, kind: NotFound, message: \\\"No such file or directory\\\" }\""
I am able to find the patch file in nix store: /nix/store/109zbiqkhxnw9dpr0qazg29m4ap8p6ha-tari-5.2.0-vendor/libtor-src-47.13.0+0.4.7.13/patches, but I'm not quite sure how to tell cargo to look there. Would appreciate any help :)
| 00:48:27 |
| bivsk | * Hello! I'm trying to package a rust program, however one of the dependent crates is failing to build due to a missing patch. This is my package.nix: https://bpa.st/LQWQ
I'm getting the error: Error: "Error applying patch '/build/tari-5.2.0-vendor/libtor-src-47.13.0+0.4.7.13/patches/libevent-0001-libevent-makefile.patch': \"Os { code: 2, kind: NotFound, message: \\\"No such file or directory\\\" }\""
I am able to find the patch file in nix store: /nix/store/109zbiqkhxnw9dpr0qazg29m4ap8p6ha-tari-5.2.0-vendor/libtor-src-47.13.0+0.4.7.13/patches, but I'm not quite sure how to tell cargo to look there. Would appreciate any help :) | 01:14:16 |
| bivsk | Maybe I can skip building libtor-src altogether and use tor from nixpkgs? Not really sure how that works yet. | 01:37:24 |
| 29 Oct 2021 |
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