ollama: packaging fixes (#341161)

  lib,

  buildGoModule,

  fetchFromGitHub,

  fetchpatch,

  buildEnv,

  linkFarm,

  overrideCC,

  vendorHash = "sha256-hSxcREAujhvzHVNwnRTfhi0MKI3s8HNavER2VLz6SYk=";

  # ollama's patches of llama.cpp's example server

  # `ollama/llm/generate/gen_common.sh` -> "apply temporary patches until fix is upstream"

  # each update, these patches should be synchronized with the contents of `ollama/llm/patches/`

  llamacppPatches = [

    (preparePatch "01-load-progress.diff" "sha256-UTmnBS5hQjIL3eXDZc8RBDNJunLlkqJWH20LpXNiGRQ=")

    (preparePatch "02-clip-log.diff" "sha256-rMWbl3QgrPlhisTeHwD7EnGRJyOhLB4UeS7rqa0tdXM=")

    (preparePatch "03-load_exception.diff" "sha256-NJkT/k8Mf8HcEMb0XkaLmyUNKV3T+384JRPnmwDI/sk=")

    (preparePatch "04-metal.diff" "sha256-bPBCfoT3EjZPjWKfCzh0pnCUbM/fGTj37yOaQr+QxQ4=")

    (preparePatch "05-default-pretokenizer.diff" "sha256-mxqHnDbiy8yfKFUYryNTj/xay/lx9KDiZAiekFSkxr8=")

    (preparePatch "06-embeddings.diff" "sha256-+4yAEAX1JJenOksG2OxDCwiLEoLj1glJQLIgV08BI5Q=")

    (preparePatch "07-clip-unicode.diff" "sha256-1qMJoXhDewxsqPbmi+/7xILQfGaybZDyXc5eH0winL8=")

  ];

  preparePatch =

    patch: hash:

    fetchpatch {

      url = "file://${src}/llm/patches/${patch}";

      inherit hash;

      stripLen = 1;

      extraPrefix = "llm/llama.cpp/";

    };

  validateFallback = lib.warnIf (config.rocmSupport && config.cudaSupport) (lib.concatStrings [

    "both `nixpkgs.config.rocmSupport` and `nixpkgs.config.cudaSupport` are enabled, "

    "but they are mutually exclusive; falling back to cpu"

      # disable uses of `git` in the `go generate` script

      # ollama's build script assumes the source is a git repo, but nix removes the git directory

      # this also disables necessary patches contained in `ollama/llm/patches/`

      # those patches are added to `llamacppPatches`, and reapplied here in the patch phase

      # those patches are applied in `postPatch`

      ./disable-git.patch

    ] ++ llamacppPatches;

    ];

    postPatch = ''

      # replace inaccurate version number with actual release version

      substituteInPlace version/version.go --replace-fail 0.0.0 '${version}'

      # apply llama.cpp patches

      for cur in llm/patches/*; do patch -p1 -d llm/llama.cpp < $cur; done

    '';

    overrideModAttrs = (

      finalAttrs: prevAttrs: {

        # don't run llama.cpp build in the module fetch phase

        preBuild = "";

      }

    );

    preBuild = ''

      # disable uses of `git`, since nix removes the git directory

      export OLLAMA_SKIP_PATCHING=true