golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1: GetState

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/term.GetState in pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1
Demonstrate these symbols/APIs:
  - golang.org/x/term.GetState

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:ed931410f2a8fd6fec1530e5ba29be39cff2cf0f557542c9f33c526674f98451","contract":["term.GetState returns error on invalid file descriptor -1","term.GetState returns error on non-terminal pipe reader","term.GetState returns error on non-terminal pipe writer","term.GetState returns error after file descriptor is closed"],"goal":"verify golang.org/x/term.GetState in pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1","kind":"HOW","packages":["pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1"],"schemaVersion":1,"symbols":["golang.org/x/term.GetState"]},"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/term@v0.0.0-20201126162022-7de9c90e9dd1"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1","symbols":["golang.org/x/term.GetState"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1

require golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect

golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=

package main

import (
	"fmt"
	"os"

	"golang.org/x/term"
)

func main() {
	state, err := term.GetState(int(os.Stdin.Fd()))
	if err != nil {
		fmt.Printf("os.Stdin is not a terminal: %v\n", err)
	} else {
		fmt.Println("os.Stdin is a terminal, state retrieved")
		_ = state
	}

	_, err = term.GetState(-1)
	if err != nil {
		fmt.Printf("GetState(-1) returned expected error: %v\n", err)
	}
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/term.GetState in pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/term@v0.0.0-20201126162022-7de9c90e9dd1"
  ],
  "symbols": [
    "golang.org/x/term.GetState"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/term"
)

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

func runContractTests() error {
	// 1. term.GetState returns error on invalid file descriptor -1
	if _, err := term.GetState(-1); err == nil {
		return fmt.Errorf("expected error from term.GetState(-1), got nil")
	}

	// 2. term.GetState returns error on non-terminal pipe reader
	r, w, err := os.Pipe()
	if err != nil {
		return fmt.Errorf("failed to create pipe: %w", err)
	}
	defer r.Close()
	defer w.Close()

	if _, err := term.GetState(int(r.Fd())); err == nil {
		return fmt.Errorf("expected error from term.GetState on pipe reader, got nil")
	}

	// 3. term.GetState returns error on non-terminal pipe writer
	if _, err := term.GetState(int(w.Fd())); err == nil {
		return fmt.Errorf("expected error from term.GetState on pipe writer, got nil")
	}

	// 4. term.GetState returns error after file descriptor is closed
	tmpFile, err := os.CreateTemp("", "contract_term_*")
	if err != nil {
		return fmt.Errorf("failed to create temp file: %w", err)
	}
	fd := int(tmpFile.Fd())
	if err := tmpFile.Close(); err != nil {
		return fmt.Errorf("failed to close temp file: %w", err)
	}
	os.Remove(tmpFile.Name())

	if _, err := term.GetState(fd); err == nil {
		return fmt.Errorf("expected error from term.GetState on closed fd, got nil")
	}

	return nil
}