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

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.Statfs 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:
  - golang.org/x/sys/unix.Statfs

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:sha256:888ae69c4cdb89216a9deb037cc99bc7c5f03de61b3b37df11af063138236d62","contract":["unix.Statfs(path, \u0026statfs) succeeds without error on current directory","unix.Statfs returns positive block size and total blocks"],"goal":"verify golang.org/x/sys/unix.Statfs 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":["golang.org/x/sys/unix.Statfs"]},"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@v0.41.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.41.0","symbols":["golang.org/x/sys/unix.Statfs"],"verifierAdapter":"golang@1"}

module sample

go 1.24.0

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=

package main

import (
	"fmt"

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

// GetFileSystemStats retrieves the filesystem statistics for the given path.
func GetFileSystemStats(path string) (unix.Statfs_t, error) {
	var stat unix.Statfs_t
	err := unix.Statfs(path, &stat)
	return stat, err
}

func main() {
	stat, err := GetFileSystemStats(".")
	if err != nil {
		fmt.Printf("Statfs error: %v\n", err)
		return
	}
	fmt.Printf("Filesystem stats: Type=%d, Bsize=%d, Blocks=%d, Bfree=%d, Bavail=%d\n",
		stat.Type, stat.Bsize, stat.Blocks, stat.Bfree, stat.Bavail)
}

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

package main

import (
	"fmt"
	"os"

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

func main() {
	var stat unix.Statfs_t
	err := unix.Statfs(".", &stat)
	if err != nil {
		fmt.Fprintf(os.Stderr, "contract violation: Statfs(\".\") failed: %v\n", err)
		os.Exit(1)
	}

	if stat.Bsize <= 0 {
		fmt.Fprintf(os.Stderr, "contract violation: Bsize (%d) <= 0\n", stat.Bsize)
		os.Exit(1)
	}

	if stat.Blocks <= 0 {
		fmt.Fprintf(os.Stderr, "contract violation: Blocks (%d) <= 0\n", stat.Blocks)
		os.Exit(1)
	}

	fmt.Printf("contract passed: Statfs succeeded with Bsize=%d, Blocks=%d\n", stat.Bsize, stat.Blocks)
}