| 13 Sep 2025 |
 puck | all this to say i don't think there's much of a subset of Nix that would let you reasonably test performance; the only real-world performance test i can think of is "how well can you evaluate nixpkgs"; which requires .. well, everything | 21:00:59 |
 magic_rb | right, okay, point taken, ig ill have to implement enough to eval nixpkgs to actually get any data | 21:10:14 |
| magic_rb | ... | 21:10:15 |
| magic_rb | well, im not even at a functional VM so uh, thats ways off, currently trying to wrap my head around the STG still | 21:10:36 |
| magic_rb | okay, i have no clue what im doing, anyone know the STG and can help me find the bug? or anyone up for a fun pairing? I'm pretty sure im folling the paper to the letter but its being weird, i suspect a miscompilation from Nix -> STG, cause the STG VM is behaving exactly as the paper says | 21:32:15 |
 jaen | Slowly working on installer rebase and need an opinion — I have some tests that are failing because it assumes existence of a default profile that has nix in it, cf:
https://github.com/DeterminateSystems/nix-installer/blob/8a7bb095d93ada552d20d2f22ffd9f1668f8e394/src/profile/nixenv/tests.rs#L135-L136
https://github.com/DeterminateSystems/nix-installer/blob/8a7bb095d93ada552d20d2f22ffd9f1668f8e394/src/profile/nixenv/mod.rs#L98
It is not the case on my system, it links into per-user/root/profile which does not exist (the folder only has channels there. And I'm wondering if it's my NixOS setup that's wrong or is detsys assuming something that's not really true? | 21:59:15 |
| 14 Sep 2025 |
|  @emma:rory.gay joined the room. | 08:32:48 |
|  @azharmomin:kde.org joined the room. | 16:22:28 |
| @azharmomin:kde.org left the room. | 16:37:42 |
|  @xworld21:matrix.org left the room. | 18:37:24 |
| 15 Sep 2025 |
 Sergei Zimmerman (xokdvium) | Btw here's the manifistation of this fever dream of mine: https://github.com/NixOS/nix/pull/13987 | 00:16:54 |
| 16 Sep 2025 |
 getchoo | i think i have a decent solution here: https://github.com/getchoo-contrib/nix/tree/getchoo/dogfood-experimental-installer
it currently grabs the artifacts the 0.27.0, but it wouldn't be too hard to extend to fetch from the main branch builds (if they actually uploaded their artifacts)
dogfooding even works as well! ...but i did come across an interesting problem | 04:18:02 |
| getchoo | when dogfooding is an enabled with this experimental installer option, you'll end up with an 4: Failed to execute command HOME="/root" "/nix/store/dkmylx2wyz9i6ycbmr07lpv15mph0d7y-nix-main-2.32.0pre/bin/nix-store" "--load-db"`` error
i traced it back to this pretty naive snippet of code that basically just takes the first path in the store matching nix-* and runs it, with no checks for if /bin/nix-store actually exists https://github.com/NixOS/experimental-nix-installer/blob/20be610e1f29c8a127146da67ed56f879b173ac6/src/action/base/setup_default_profile.rs#L55-L70 | 04:19:47 |
| getchoo | this worked before the component split in 2.29 since there would only be one main nix store path at this point, but now it matches the nix-main store path first, which doesn't a bin dir or any of the nix binaries | 04:21:02 |
| getchoo | i figured this was something probably fixed in an update upstream and i'd need to wait on a rebase, but the code there actually remains entirely the same https://github.com/DeterminateSystems/nix-installer/blob/8a7bb095d93ada552d20d2f22ffd9f1668f8e394/src/action/base/setup_default_profile.rs#L56-L69 | 04:22:07 |
| getchoo | i think this might only work because the hash part of the release nix store path happens to be sorted before the other components, while it isn't in the pre-release tarball from the artifacts i'm pushing into this lol | 04:33:40 |
| getchoo | * when dogfooding is enabled with this experimental installer option, you'll end up with an 4: Failed to execute command HOME="/root" "/nix/store/dkmylx2wyz9i6ycbmr07lpv15mph0d7y-nix-main-2.32.0pre/bin/nix-store" "--load-db"`` error
i traced it back to this pretty naive snippet of code that basically just takes the first path in the store matching nix-* and runs it, with no checks for if /bin/nix-store actually exists https://github.com/NixOS/experimental-nix-installer/blob/20be610e1f29c8a127146da67ed56f879b173ac6/src/action/base/setup_default_profile.rs#L55-L70 | 04:33:57 |
