golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b: unix.Getgid

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.Getgid in pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.Getgid

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:sha256:06d43b410cd201851b6878fe2cadbfb8b292ad7ce7c6da3c4609d1da9b2b3f4a","contract":["unix.Getgid() returns non-negative integer","unix.Getgid() equals os.Getgid()"],"goal":"verify golang.org/x/sys/unix.Getgid in pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.Getgid"]},"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@v0.0.0-20181122145206-62eef0e2fa9b"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b","symbols":["golang.org/x/sys/unix.Getgid"],"verifierAdapter":"golang@1"}

module sample

go 1.20

require golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b

golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b h1:MQE+LT/ABUuuvEZ+YQAMSXindAdUh7slEmAkup74op4=
golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=

package main

import (
	"fmt"

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

// GetGroupID returns the numeric group ID of the calling process using golang.org/x/sys/unix.
func GetGroupID() int {
	return unix.Getgid()
}

func main() {
	gid := GetGroupID()
	fmt.Printf("Current GID: %d\n", gid)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.Getgid in pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20181122145206-62eef0e2fa9b"
  ],
  "symbols": [
    "golang.org/x/sys/unix.Getgid"
  ]
}

package main

import (
	"fmt"
	"os"

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

func main() {
	gid := unix.Getgid()
	if gid < 0 {
		fmt.Fprintf(os.Stderr, "contract violation: Getgid() returned negative value %d\n", gid)
		os.Exit(1)
	}

	expected := os.Getgid()
	if gid != expected {
		fmt.Fprintf(os.Stderr, "contract violation: Getgid() returned %d, expected %d\n", gid, expected)
		os.Exit(1)
	}

	fmt.Printf("contract passed: unix.Getgid() returned valid gid %d\n", gid)
}