golang.org/x/sys v0.0.0-20210510120138-977fb7262007: unix.Utsname

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.Utsname in pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.Utsname

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:sha256:665e027a534a9cfc60b63b3c6bd940f4cef0091c7d8e32d50cc6d22ea06fd420","contract":["unix.Uname populates unix.Utsname structure with non-empty system metadata","unix.ByteSliceToString decodes unix.Utsname sysname into a non-empty string","unix.Utsname machine field decodes to a non-empty machine architecture","unix.Utsname release field decodes to a valid OS kernel release string"],"goal":"verify golang.org/x/sys/unix.Utsname in pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.Utsname"]},"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@v0.0.0-20210510120138-977fb7262007"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007","symbols":["golang.org/x/sys/unix.Utsname"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.0.0-20210510120138-977fb7262007

golang.org/x/sys v0.0.0-20210510120138-977fb7262007 h1:gG67DSER+11cZvqIMb8S8bt0vZtiN6xWYARwirrOSfE=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"
	"os"

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

// SystemInfo holds decoded string representations of unix.Utsname fields.
type SystemInfo struct {
	Sysname    string
	Nodename   string
	Release    string
	Version    string
	Machine    string
	Domainname string
}

// GetUtsname fetches the raw unix.Utsname struct from the kernel.
func GetUtsname() (unix.Utsname, error) {
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		return uts, fmt.Errorf("uname failed: %w", err)
	}
	return uts, nil
}

// ParseUtsname converts a unix.Utsname struct into human-readable strings.
func ParseUtsname(uts unix.Utsname) SystemInfo {
	return SystemInfo{
		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[:]),
		Domainname: unix.ByteSliceToString(uts.Domainname[:]),
	}
}

func main() {
	uts, err := GetUtsname()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
		os.Exit(1)
	}

	info := ParseUtsname(uts)
	fmt.Printf("OS: %s\n", info.Sysname)
	fmt.Printf("Node: %s\n", info.Nodename)
	fmt.Printf("Release: %s\n", info.Release)
	fmt.Printf("Version: %s\n", info.Version)
	fmt.Printf("Machine: %s\n", info.Machine)
	fmt.Printf("Domain: %s\n", info.Domainname)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.Utsname in pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007"
  ],
  "symbols": [
    "golang.org/x/sys/unix.Utsname"
  ]
}

package main

import (
	"fmt"
	"os"
	"strings"

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

func main() {
	// Assertion 1: unix.Uname populates unix.Utsname structure with non-empty system metadata
	var uts unix.Utsname
	if err := unix.Uname(&uts); err != nil {
		fmt.Fprintf(os.Stderr, "FAIL: unix.Uname failed: %v\n", err)
		os.Exit(1)
	}

	// Assertion 2: unix.ByteSliceToString decodes unix.Utsname sysname into a non-empty string
	sysname := unix.ByteSliceToString(uts.Sysname[:])
	if strings.TrimSpace(sysname) == "" {
		fmt.Fprintf(os.Stderr, "FAIL: Sysname string is empty\n")
		os.Exit(1)
	}

	// Assertion 3: unix.Utsname machine field decodes to a non-empty machine architecture
	machine := unix.ByteSliceToString(uts.Machine[:])
	if strings.TrimSpace(machine) == "" {
		fmt.Fprintf(os.Stderr, "FAIL: Machine string is empty\n")
		os.Exit(1)
	}

	// Assertion 4: unix.Utsname release field decodes to a valid OS kernel release string
	release := unix.ByteSliceToString(uts.Release[:])
	if strings.TrimSpace(release) == "" {
		fmt.Fprintf(os.Stderr, "FAIL: Release string is empty\n")
		os.Exit(1)
	}

	fmt.Println("PASS: golang.org/x/sys/unix.Utsname contract passed")
}