golang.org/x/sys v0.41.0: unix.Uname

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 unix.Uname in pkg:golang/golang.org/x/sys@v0.41.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.41.0
Demonstrate these symbols/APIs:
  - unix.Uname

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.

package sample_test

import (
	"strings"
	"testing"

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

func TestUnameContract(t *testing.T) {
	// 1. unix.Uname retrieves system identification information into a *unix.Utsname struct without error on Linux
	var uts unix.Utsname
	err := unix.Uname(&uts)
	if err != nil {
		t.Fatalf("unexpected error from unix.Uname: %v", err)
	}

	// 2. unix.ByteSliceToString converts null-terminated Utsname byte arrays into Go strings
	sysname := unix.ByteSliceToString(uts.Sysname[:])
	nodename := unix.ByteSliceToString(uts.Nodename[:])
	release := unix.ByteSliceToString(uts.Release[:])
	version := unix.ByteSliceToString(uts.Version[:])
	machine := unix.ByteSliceToString(uts.Machine[:])

	// 3. unix.Uname populates Sysname matching "Linux" and non-empty Machine architecture and Release strings
	if sysname != "Linux" {
		t.Fatalf("expected Sysname to be Linux, got %q", sysname)
	}

	if len(release) == 0 {
		t.Fatalf("expected non-empty Release string")
	}

	if len(version) == 0 {
		t.Fatalf("expected non-empty Version string")
	}

	if len(machine) == 0 {
		t.Fatalf("expected non-empty Machine string")
	}

	// Nodename should be non-empty (host or container name)
	if len(nodename) == 0 {
		t.Fatalf("expected non-empty Nodename string")
	}

	// Machine should typically be x86_64, aarch64, arm64, or similar valid arch identifiers
	validArchPrefixes := []string{"x86", "amd64", "arm", "aarch64", "riscv", "mips", "s390", "ppc", "i386", "i686"}
	hasValidArch := false
	for _, prefix := range validArchPrefixes {
		if strings.HasPrefix(strings.ToLower(machine), prefix) {
			hasValidArch = true
			break
		}
	}
	if !hasValidArch {
		t.Fatalf("unexpected Machine architecture: %q", machine)
	}

	// 4. unix.Uname returns an error when passed a nil pointer or invalid address
	errNil := unix.Uname(nil)
	if errNil == nil {
		t.Fatalf("expected error when calling unix.Uname with nil, got nil")
	}
	if errNil != unix.EFAULT && errNil != unix.EINVAL {
		t.Logf("unix.Uname(nil) returned error: %v (expected EFAULT or EINVAL)", errNil)
	}
}

{"case":{"caseId":"case:sha256:f88e5a44d86d45aadd011d913e8d32f0104778a5cc210cfe911c05ba8d50f186","contract":["unix.Uname retrieves system identification information into a *unix.Utsname struct without error on Linux","unix.ByteSliceToString converts null-terminated Utsname byte arrays into Go strings","unix.Uname populates Sysname matching Linux and non-empty Machine architecture and Release strings","unix.Uname returns an error when passed a nil pointer or invalid address"],"goal":"verify unix.Uname in pkg:golang/golang.org/x/sys@v0.41.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.41.0"],"schemaVersion":1,"symbols":["unix.Uname"]},"contractCommand":["go","test","-v","./..."],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/sys@v0.41.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.41.0","symbols":["unix.Uname"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require golang.org/x/sys v0.41.0

golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=

{
  "schemaVersion": 1,
  "goal": "verify unix.Uname in pkg:golang/golang.org/x/sys@v0.41.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.41.0"
  ],
  "symbols": [
    "unix.Uname"
  ]
}