golang.org/x/sys v0.24.0: unix.ENOENT

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.ENOENT in pkg:golang/golang.org/x/sys@v0.24.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.24.0
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.ENOENT

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:sha256:8ffa13d6997c9975bafc7552dbdaa2f44979541a73d85943350defb8bc3f2a4a","contract":["unix.ENOENT represents errno 2 with error string \"no such file or directory\" and ErrnoName \"ENOENT\"","unix.Open on a nonexistent path returns an error matching unix.ENOENT","unix.Stat on a nonexistent path returns an error matching unix.ENOENT","unix.Unlink on a nonexistent path returns an error matching unix.ENOENT","errors.Is matches unix.ENOENT with syscall.ENOENT","unix.ENOENT reports false for Temporary and Timeout errors"],"goal":"verify golang.org/x/sys/unix.ENOENT in pkg:golang/golang.org/x/sys@v0.24.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.24.0"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.ENOENT"]},"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@v0.24.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.24.0","symbols":["golang.org/x/sys/unix.ENOENT"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require golang.org/x/sys v0.24.0

golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"

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

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

	missingPath := filepath.Join(tmpDir, "missing-target")
	_, err = unix.Open(missingPath, unix.O_RDONLY, 0)
	if !errors.Is(err, unix.ENOENT) {
		fmt.Fprintf(os.Stderr, "expected unix.ENOENT, got: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("verified unix.ENOENT (%d): %v\n", int(unix.ENOENT), unix.ENOENT)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.ENOENT in pkg:golang/golang.org/x/sys@v0.24.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.24.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.ENOENT"
  ]
}

package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"syscall"

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

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

func verifyENOENT() error {
	if uintptr(unix.ENOENT) != 2 {
		return fmt.Errorf("expected unix.ENOENT numeric value 2, got %d", uintptr(unix.ENOENT))
	}
	if unix.ENOENT.Error() != "no such file or directory" {
		return fmt.Errorf("expected error string 'no such file or directory', got %q", unix.ENOENT.Error())
	}
	if unix.ErrnoName(unix.ENOENT) != "ENOENT" {
		return fmt.Errorf("expected ErrnoName 'ENOENT', got %q", unix.ErrnoName(unix.ENOENT))
	}

	tmpDir, err := os.MkdirTemp("", "enoent-contract-*")
	if err != nil {
		return fmt.Errorf("failed to create temp dir: %w", err)
	}
	defer os.RemoveAll(tmpDir)

	missingPath := filepath.Join(tmpDir, "does-not-exist")

	if _, err := unix.Open(missingPath, unix.O_RDONLY, 0); !errors.Is(err, unix.ENOENT) {
		return fmt.Errorf("expected unix.Open on missing path to match unix.ENOENT, got %v", err)
	}

	var stat unix.Stat_t
	if err := unix.Stat(missingPath, &stat); !errors.Is(err, unix.ENOENT) {
		return fmt.Errorf("expected unix.Stat on missing path to match unix.ENOENT, got %v", err)
	}

	if err := unix.Unlink(missingPath); !errors.Is(err, unix.ENOENT) {
		return fmt.Errorf("expected unix.Unlink on missing path to match unix.ENOENT, got %v", err)
	}

	if !errors.Is(unix.ENOENT, syscall.ENOENT) || !errors.Is(syscall.ENOENT, unix.ENOENT) {
		return fmt.Errorf("expected errors.Is equivalence between unix.ENOENT and syscall.ENOENT")
	}

	if unix.ENOENT.Temporary() || unix.ENOENT.Timeout() {
		return fmt.Errorf("expected unix.ENOENT Temporary() and Timeout() to be false")
	}

	return nil
}