Feature Request: Use Fixed Output Derivation to reduce required hash updates

[aster-void]

Current

        (prisma-utils.lib.prisma-factory {
          inherit pkgs;
          # just copy these hashes for now, and then change them when nix complains about the mismatch
          prisma-fmt-hash = "sha256-4zsJv0PW8FkGfiiv/9g0y5xWNjmRWD8Q2l2blSSBY3s="; 
          query-engine-hash = "sha256-6ILWB6ZmK4ac6SgAtqCkZKHbQANmcqpWO92U8CfkFzw=";
          libquery-engine-hash = "sha256-n9IimBruqpDJStlEbCJ8nsk8L9dDW95ug+gz9DHS1Lc=";
          schema-engine-hash = "sha256-j38xSXOBwAjIdIpbSTkFJijby6OGWCoAx+xZyms/34Q=";
        }).fromNpmLock
          ./package-lock.json; # <--- path to our package-lock.json file that contains the version of prisma-engines

Requested

        (prisma-utils.lib.prisma-factory {
          inherit pkgs;
          # just copy these hashes for now, and then change them when nix complains about the mismatch
         hash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
        }).fromNpmLock
          ./package-lock.json; # <--- path to our package-lock.json file that contains the version of prisma-engines

Notes

I'm willing to implement it if you want.

[VanCoding]

I've also thought about this and think it would be really cool.
I'm surely going to merge it if you'll implement it.

The question is: do we still support the old method? I'm a bit worried about causing necessary changes to users.
Are fixed output derivations still behind a flag btw?

Also in case you didn't know: Prisma is migrating away from rust to typescript and I'm not sure if this library will still be needed in the future. That's why I was not very active on this one.

[aster-void]

I'm not sure what's considered a flag, but it shouldn't be too difficult to switch depending on if hash is provided or not.

{
  hash ? null,
  # rest params
}:
  if hash != null then
  1 # new implementation
  else
   0 # old implementation

I've heard about the TS migration, but it doesn't seem like it's coming soon, so I still think the support is valuable.
I also use this flake very often.

[VanCoding]

ok, so you intend to keep the old implementation for now, right? I think that would be the best thing to do.

I'm not sure what's considered a flag, but it shouldn't be too difficult to switch depending on if hash is provided or not.

Ah, meant if the "fixed output derivation"-feature of nix is behind a flag. But I confused it with content adressable derivations, which still is an experimental feature I think. Fixed Output Derivations are available in nix since the beginning I guess.