{
  lib,
  rustPlatform,
  fetchFromGitHub,
}:

# furrow is the copy-on-write workspace snapper codeaf drives. codeaf ships a
# copy of it inside the go binary: the release asset from GitHub, glibc-dynamic
# and untouched by anything in this build, so the file codeaf writes out to
# ~/.codeaf/bin/furrow-<version> cannot start here — NixOS answers "Could not
# start dynamically linked executable" and names stub-ld. Building furrow here
# instead gives the same version as an ordinary Nix binary, and codeaf is told
# to use it through CODEAF_FURROW, which internal/furrow reads before it ever
# looks at the embedded copy. See ./package.nix.
#
# The version here has to be the one codeaf pinned in
# internal/furrowbin/pin.json: the decoders in codeaf were written for that
# furrow. Bump the two together.
rustPlatform.buildRustPackage rec {
  pname = "furrow";
  version = "0.1.0";

  src = fetchFromGitHub {
    owner = "Agent-Field";
    repo = "furrow";
    rev = "v${version}";
    hash = "sha256-xknfvnBDFxDYeBE1yAjXl1Fx3VDHrNSUhXEWQO3PK6s=";
  };

  cargoHash = "sha256-FGtrKtWFPcT3R8nF5OQFlmIiKSuZ8aiHfj76bBvga5A=";

  # Only the unit tests run here. Every cli integration test builds a fixture
  # whose first step is `xattr::set(…, "user.furrow-test", …)`, and the sandbox
  # /tmp is a tmpfs that answers EOPNOTSUPP for user.* xattrs, so all 54 of them
  # die in setup — same reason forks_files_links_modes_and_xattrs is skipped, in
  # the one lib test that touches an xattr. Upstream's CI runs the whole suite on
  # a filesystem that supports them.
  cargoTestFlags = [ "--lib" ];
  checkFlags = [
    "--skip"
    "forks_files_links_modes_and_xattrs"
  ];

  meta = with lib; {
    description = "Local-first working-state snapshots for agentic development";
    homepage = "https://github.com/Agent-Field/furrow";
    changelog = "https://github.com/Agent-Field/furrow/releases/tag/v${version}";
    license = licenses.asl20;
    # Thirteen source files use std::os::unix with no windows guards, so the
    # upstream release has no windows asset either.
    platforms = platforms.unix;
    mainProgram = "furrow";
  };
}