add oh-my-pi
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@@ -0,0 +1,221 @@
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{ bun2nix, fetchFromGitHub, fetchurl, fetchzip, runCommand, python3, pkgs, stdenv, ... }:
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# NOTE: This derivation works around two open bun2nix bugs. Remove the
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# workarounds and simplify once they are fixed upstream.
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#
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# Bug 1 — missing .npm manifest cache files
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# https://github.com/nix-community/bun2nix/issues/77
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#
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# bun's install cache requires two kinds of entries per package:
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# - the extracted package directory (e.g. handlebars@4.7.9@@@1/)
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# - a hashed .npm manifest file (e.g. 02dd05ab1686ff3a.npm)
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# bun2nix only provides the former. bun therefore fetches the manifest from
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# the registry during the "Resolving" phase, which fails in the Nix sandbox.
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#
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# Workaround: pass --offline to bun install. This tells bun to skip manifest
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# fetches and trust the lockfile for resolution instead.
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#
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# Bug 2 — catalog: specifiers still trigger network resolution with --offline
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# https://github.com/nix-community/bun2nix/issues/77 (same thread)
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#
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# bun2nix's bunResolveCatalogRefs rewrites "catalog:" specifiers in
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# package.json to the version *range* from the catalog table (e.g. "^1.3.14")
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# rather than the exact pinned version from bun.lock's packages section.
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# Even with --offline, bun reads the catalog table from bun.lock and tries to
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# resolve those ranges, hitting the network.
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#
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# Workaround: the Python script below pre-processes the source before the
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# build. It pins every dep in every workspace package.json to the exact
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# version from bun.lock's packages section (so no ranges remain for bun to
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# resolve), and strips the catalog/catalogs keys from bun.lock entirely.
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#
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# bun.lock is JSONC (trailing-comma JSON) so we parse it with Python's stdlib
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# json after stripping trailing commas with a regex.
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#
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# Additionally, oh-my-pi's bun.lock was generated with bun >=1.3.14 which uses
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# a different Wyhash seed for cache keys than nixpkgs's bun 1.3.13. Bumping bun
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# globally breaks other packages (e.g. opencode), so instead we patch the
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# generated wrapper script in postInstall to reference bun 1.3.14 directly.
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# Hashes from https://github.com/NixOS/nixpkgs/pull/519796
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let
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version = "15.2.1";
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# bun 1.3.14 — needed for correct cache key hashes; scoped to this package.
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bun_1_3_14 = pkgs.bun.overrideAttrs (_: {
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version = "1.3.14";
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src =
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let
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sources = {
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"aarch64-darwin" = fetchurl {
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url = "https://github.com/oven-sh/bun/releases/download/bun-v1.3.14/bun-darwin-aarch64.zip";
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hash = "sha256-2LliIYKK1vl6x6wKt+lYcjQa92MAHogD6CZ2UsJlJiA=";
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};
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"aarch64-linux" = fetchurl {
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url = "https://github.com/oven-sh/bun/releases/download/bun-v1.3.14/bun-linux-aarch64.zip";
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hash = "sha256-on/7Y6gxA3WDbg1vZorhf6jY0YuIw3yCHGUzGXOhmjs=";
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};
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"x86_64-darwin" = fetchurl {
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url = "https://github.com/oven-sh/bun/releases/download/bun-v1.3.14/bun-darwin-x64-baseline.zip";
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hash = "sha256-PjWtb1OXGpg0v55nhuKt9ytfGSHMmpxf3gc9KXKUQHY=";
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};
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"x86_64-linux" = fetchurl {
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url = "https://github.com/oven-sh/bun/releases/download/bun-v1.3.14/bun-linux-x64.zip";
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hash = "sha256-lR7iruhV8IWVruxiJSJqKY0/6oOj3NZGXAnLzN9+hI8=";
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};
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};
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in
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sources.${stdenv.hostPlatform.system} or (throw "bun 1.3.14 not available for ${stdenv.hostPlatform.system}");
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});
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src = fetchFromGitHub {
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owner = "can1357";
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repo = "oh-my-pi";
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rev = "v${version}";
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hash = "sha256-fztQJrhDG5ZbTlgqoHA96eCgwYm5WIna3mAPlCDWYLM=";
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};
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# The workspace source for @oh-my-pi/pi-natives has no pre-built .node
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# binaries — those only exist in the npm tarball. Fetch it so we can copy
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# the platform binaries into packages/natives/native/ before the build.
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piNativesTarball = fetchzip {
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url = "https://registry.npmjs.org/@oh-my-pi/pi-natives/-/pi-natives-${version}.tgz";
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hash = "sha256-mEEnvTNxWFVSs1An61K83sSjUJ5bz4yrluwZvz1+6fg=";
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stripRoot = false;
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};
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srcWithBunNix = runCommand "oh-my-pi-src" {
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nativeBuildInputs = [ bun2nix bun_1_3_14 python3 ];
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} ''
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cp -r ${src} $out
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chmod -R u+w $out
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# Copy pre-built .node binaries from the npm tarball into the workspace
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# source so the runtime can load the native addon without building Rust.
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cp ${piNativesTarball}/package/native/*.node $out/packages/natives/native/
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bun2nix --lock-file $out/bun.lock --output-file $out/bun.nix
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python3 - "$out" << 'EOF'
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import sys, re, json, os
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root = sys.argv[1]
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lock_path = os.path.join(root, "bun.lock")
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raw = open(lock_path).read()
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lock = json.loads(re.sub(r',(\s*[}\]])', r'\1', raw))
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packages = lock.get("packages", {})
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catalog = lock.get("catalog", {})
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catalogs = lock.get("catalogs", {})
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# Build name -> exact resolved version from the packages section.
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resolved = {}
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for name, entry in packages.items():
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if isinstance(entry, list) and entry and isinstance(entry[0], str):
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spec = entry[0]
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if spec.startswith(name + "@"):
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resolved[name] = spec[len(name) + 1:]
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def pin(name, spec):
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"""Pin a dep specifier to its exact resolved version from bun.lock."""
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if not isinstance(spec, str):
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return spec
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# catalog: specifiers — resolve via catalog table then pinned version.
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if spec.startswith("catalog:"):
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cname = spec[len("catalog:"):]
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table = catalog if cname == "" else catalogs.get(cname, {})
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rv = resolved.get(name)
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cv = table.get(name)
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if isinstance(rv, str) and rv.startswith("workspace:"):
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return "workspace:*"
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if isinstance(rv, str):
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return rv
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if isinstance(cv, str):
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return cv
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return spec
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# Any npm version range — pin to exact resolved version.
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if not spec.startswith(("workspace:", "file:", "link:", "git", "http", "/")):
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rv = resolved.get(name)
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if isinstance(rv, str) and rv.startswith("workspace:"):
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return "workspace:*"
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if isinstance(rv, str):
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return rv
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return spec
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sections = ["dependencies", "devDependencies", "peerDependencies", "optionalDependencies"]
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def rewrite(holder):
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for sec in sections:
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deps = holder.get(sec)
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if isinstance(deps, dict):
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for name in list(deps):
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deps[name] = pin(name, deps[name])
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# Rewrite bun.lock workspaces and drop the catalog tables.
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for ws in lock.get("workspaces", {}).values():
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rewrite(ws)
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lock.pop("catalog", None)
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lock.pop("catalogs", None)
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open(lock_path, "w").write(json.dumps(lock, indent=2) + "\n")
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# Rewrite each workspace package.json (root "" included).
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for ws_dir in lock.get("workspaces", {}):
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pkg_path = os.path.join(root, ws_dir, "package.json")
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if not os.path.exists(pkg_path):
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continue
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pkg = json.loads(open(pkg_path).read())
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rewrite(pkg)
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open(pkg_path, "w").write(json.dumps(pkg, indent=2) + "\n")
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EOF
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'';
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in
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(bun2nix.writeBunApplication {
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pname = "omp";
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inherit version;
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src = srcWithBunNix;
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# oh-my-pi requires bun >=1.3.14 at runtime. writeBunApplication prepends
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# pkgs.bun (1.3.13) to PATH in the startup script, so we use an absolute
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# path to bun 1.3.14 instead of relying on PATH resolution.
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#
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# writeBunApplication's installPhase does `cd $out/share/$pname` before
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# exec, so $PWD is always the store path. OLDPWD is set by bash's cd to the
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# user's original directory. We cd back so omp's process.cwd() is correct,
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# and use an absolute path to the entry point so bun resolves modules from
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# the store regardless of cwd.
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# At this point the wrapper has already done `cd $out/share/omp`, so $PWD
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# is the store package dir and OLDPWD is the user's original directory.
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# Capture the store dir, cd back to the user's dir so omp's process.cwd()
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# is correct, then exec bun with an absolute path so module resolution
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# still works from the store.
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startScript = ''
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_omp_pkg="$PWD"
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cd "''${OLDPWD:-$PWD}"
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exec ${bun_1_3_14}/bin/bun run "$_omp_pkg/packages/coding-agent/src/cli.ts" "$@"
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'';
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dontUseBunBuild = true;
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dontUseBunCheck = true;
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# --offline: workaround for Bug 1 above (missing .npm manifest cache files).
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bunInstallFlags = [ "--offline" "--linker=isolated" "--ignore-scripts" ];
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# Generate the docs index embedded into the binary at build time.
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# The prepack script reads docs/**/*.md and emits docs-index.generated.ts.
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postBunNodeModulesInstallPhase = ''
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${bun_1_3_14}/bin/bun run packages/coding-agent/scripts/generate-docs-index.ts
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'';
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bunDeps = bun2nix.fetchBunDeps {
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bunNix = "${srcWithBunNix}/bun.nix";
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};
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meta = {
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description = "AI coding agent for the terminal — batteries included";
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homepage = "https://omp.sh";
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mainProgram = "omp";
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};
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})
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