golang.org/x/sys v0.22.0: unix.O_DIRECTORY

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/sys/unix.O_DIRECTORY in pkg:golang/golang.org/x/sys@v0.22.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.22.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.O_DIRECTORY

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:f03e5c20127666d1a3b7de394bfcd86a126e7dfa9771902c90a246b77a931f40","contract":["unix.O_DIRECTORY is a non-zero open flag constant","unix.Open with unix.O_DIRECTORY succeeds when opening a directory","unix.Open with unix.O_DIRECTORY fails with unix.ENOTDIR when opening a regular file"],"goal":"verify golang.org/x/sys/unix.O_DIRECTORY in pkg:golang/golang.org/x/sys@v0.22.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.22.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.O_DIRECTORY"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/sys@v0.22.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.22.0","symbols":["golang.org/x/sys/unix.O_DIRECTORY"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.22.0

golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

package main

import (
	"fmt"
	"os"

	"golang.org/x/sys/unix"
)

func main() {
	tmpDir, err := os.MkdirTemp("", "o_directory_demo_*")
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to create temp dir: %v\n", err)
		os.Exit(1)
	}
	defer os.RemoveAll(tmpDir)

	fd, err := unix.Open(tmpDir, unix.O_RDONLY|unix.O_DIRECTORY, 0)
	if err != nil {
		fmt.Fprintf(os.Stderr, "unix.Open failed: %v\n", err)
		os.Exit(1)
	}
	defer unix.Close(fd)

	fmt.Printf("Opened directory descriptor: %d with O_DIRECTORY: 0x%x\n", fd, unix.O_DIRECTORY)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.O_DIRECTORY in pkg:golang/golang.org/x/sys@v0.22.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.22.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.O_DIRECTORY"
  ]
}

package main

import (
	"errors"
	"fmt"
	"os"

	"golang.org/x/sys/unix"
)

func main() {
	if err := runTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract assertions passed.")
}

func runTests() error {
	// 1. unix.O_DIRECTORY is a non-zero open flag constant
	if unix.O_DIRECTORY <= 0 {
		return fmt.Errorf("expected unix.O_DIRECTORY to be positive non-zero flag, got %d", unix.O_DIRECTORY)
	}

	// 2. unix.Open with unix.O_DIRECTORY succeeds when opening a directory
	tmpDir, err := os.MkdirTemp("", "o_directory_test_dir_*")
	if err != nil {
		return fmt.Errorf("failed to create temporary directory: %w", err)
	}
	defer os.RemoveAll(tmpDir)

	fd, err := unix.Open(tmpDir, unix.O_RDONLY|unix.O_DIRECTORY, 0)
	if err != nil {
		return fmt.Errorf("unix.Open with O_DIRECTORY on directory failed: %w", err)
	}
	if fd < 0 {
		return fmt.Errorf("expected valid file descriptor >= 0, got %d", fd)
	}
	if err := unix.Close(fd); err != nil {
		return fmt.Errorf("unix.Close failed: %w", err)
	}

	// 3. unix.Open with unix.O_DIRECTORY fails with unix.ENOTDIR when opening a regular file
	tmpFile, err := os.CreateTemp("", "o_directory_test_file_*")
	if err != nil {
		return fmt.Errorf("failed to create temporary file: %w", err)
	}
	defer os.Remove(tmpFile.Name())
	tmpFile.Close()

	fdFile, err := unix.Open(tmpFile.Name(), unix.O_RDONLY|unix.O_DIRECTORY, 0)
	if err == nil {
		unix.Close(fdFile)
		return fmt.Errorf("expected unix.Open with O_DIRECTORY on a regular file to fail, but it succeeded")
	}
	if !errors.Is(err, unix.ENOTDIR) && err != unix.ENOTDIR {
		return fmt.Errorf("expected unix.ENOTDIR error, got: %v", err)
	}

	return nil
}