| 4 Mar 2025 |
 emily | yeah | 14:22:01 |
 Arian | anyhow back to the topic. should we mount the initramf’s /nix/store as read-only? (either before starting pid1 or by patching pid1) | 14:22:11 |
| emily | I just thought it would be cool to be able to push full NixOS systems out and have them cached to disk "just in time" | 14:22:25 |
| emily | it seems good/harmless to do so if it's not too invasive | 14:23:08 |
 Nick Cao | Create a fuse based nixfs! | 14:23:18 |
| emily | though there's no potential for persistent changes anyway right, since it's just the store from the initramfs? | 14:23:19 |
| Nick Cao | I always wanted a thing that: what if we store store paths as compressed nars on the disk, and only use fuse to create an illusion of a nix store | 14:24:08 |
| emily | that's what Tvix is doing, afaik | 14:24:23 |
| emily | though I think FUSE performance kind of sucks, so you probably need to put something in the kernel at some point | 14:24:39 |
| Arian | I have usecases where I dont actually have a stage-2 and just bring the app up in initrd. In that case it’s definitely useful I think | 14:24:45 |
| emily | don't quote me on that though | 14:24:47 |
| emily | conversely maybe we'd want an escape hatch for people wild enough to actually want to run a daemon in stage 1? but those people also probably know what they're doing enough to make it work for themselves anyway. | 14:25:34 |
| emily | anyway it seems like a good idea. would be nice to avoid patching systemd for it though. | 14:25:54 |
| Arian | just s|/usr|/nix/store| through the entire codebase | 14:26:14 |
| Arian | :D | 14:26:20 |
| emily | we could just move the store into /usr. | 14:26:32 |
| emily | I bet that would make Poettering happy. | 14:26:41 |
| Arian | yeh but we’ll have to move /nix/var to /var then | 14:26:44 |
| Arian | Honestly how much breaks when we’d set NIX_STORE=/usr/store ? | 14:27:01 |
| Nick Cao | /usr/store | 14:27:04 |
| Arian | did anyone ever try?? | 14:27:06 |
| Nick Cao | So the length is the same | 14:27:07 |
| emily | make it /usr/local/nix and I'll spend Darwin capital on the paint for the bikeshed | 14:27:27 |
| Arian | sure. gotta rebuild the world. but that’s… fine | 14:27:30 |
| Nick Cao | sed the world actually | 14:27:43 |
| emily | alternate store directories are nominally supported. the Nix on Droid thing uses them | 14:27:44 |
| emily | there are packages that hard-code it but not that many. probably NixOS makes more assumptions | 14:28:10 |
| emily | no fundamental obstacle, to my knowledge | 14:28:10 |
| Arian | can you build for a /usr/store on a /nix/store system? | 14:28:11 |
| Arian | like. how do you bootstrap this | 14:28:18 |
