github.com/prometheus/procfs v0.6.0: Self

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 github.com/prometheus/procfs.Self in pkg:golang/github.com/prometheus/procfs@v0.6.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/prometheus/procfs@v0.6.0
Demonstrate these symbols/APIs:
  - github.com/prometheus/procfs.Self

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:sha256:8c99f85b3bfc8fc2e395c94d790b20431a6739c0879e4e00a7743f2fe563c5b6","contract":["procfs.Self() returns (Proc, error) where error is nil and PID matches os.Getpid()","proc.Stat() returns (ProcStat, error) where error is nil and PID matches proc.PID","proc.Comm() returns (string, error) where error is nil and comm is non-empty","proc.CmdLine() returns ([]string, error) where error is nil and args is non-empty","proc.Cwd() returns (string, error) where error is nil and cwd is non-empty","proc.Limits() returns (ProcLimits, error) where error is nil and OpenFiles is positive"],"goal":"verify github.com/prometheus/procfs.Self in pkg:golang/github.com/prometheus/procfs@v0.6.0","kind":"HOW","packages":["pkg:golang/github.com/prometheus/procfs@v0.6.0"],"schemaVersion":1,"symbols":["github.com/prometheus/procfs.Self"]},"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/github.com/prometheus/procfs@v0.6.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/prometheus/procfs@v0.6.0","symbols":["github.com/prometheus/procfs.Self"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.26.6

require github.com/prometheus/procfs v0.6.0

require golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c // indirect

github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c h1:VwygUrnw9jn88c4u8GD3rZQbqrP/tgas88tPUbBxQrk=
golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

package main

import (
	"fmt"
	"os"

	"github.com/prometheus/procfs"
)

func main() {
	proc, err := procfs.Self()
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to get self proc: %v\n", err)
		os.Exit(1)
	}

	stat, err := proc.Stat()
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to get proc stat: %v\n", err)
		os.Exit(1)
	}

	comm, err := proc.Comm()
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to get proc comm: %v\n", err)
		os.Exit(1)
	}

	fmt.Printf("procfs.Self(): PID=%d, Comm=%s, State=%s\n", proc.PID, comm, stat.State)
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/prometheus/procfs.Self in pkg:golang/github.com/prometheus/procfs@v0.6.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/prometheus/procfs@v0.6.0"
  ],
  "symbols": [
    "github.com/prometheus/procfs.Self"
  ]
}

package main

import (
	"fmt"
	"os"

	"github.com/prometheus/procfs"
)

func main() {
	// 1. procfs.Self() returns (Proc, error) where error is nil and PID matches os.Getpid()
	proc, err := procfs.Self()
	if err != nil {
		fmt.Fprintf(os.Stderr, "procfs.Self() failed: %v\n", err)
		os.Exit(1)
	}
	if proc.PID != os.Getpid() {
		fmt.Fprintf(os.Stderr, "expected proc.PID %d to match os.Getpid() %d\n", proc.PID, os.Getpid())
		os.Exit(1)
	}

	// 2. proc.Stat() returns (ProcStat, error) where error is nil and PID matches proc.PID
	stat, err := proc.Stat()
	if err != nil {
		fmt.Fprintf(os.Stderr, "proc.Stat() failed: %v\n", err)
		os.Exit(1)
	}
	if stat.PID != proc.PID {
		fmt.Fprintf(os.Stderr, "expected stat.PID %d to match proc.PID %d\n", stat.PID, proc.PID)
		os.Exit(1)
	}
	if stat.Comm == "" {
		fmt.Fprintf(os.Stderr, "expected non-empty stat.Comm\n")
		os.Exit(1)
	}

	// 3. proc.Comm() returns (string, error) where error is nil and comm is non-empty
	comm, err := proc.Comm()
	if err != nil {
		fmt.Fprintf(os.Stderr, "proc.Comm() failed: %v\n", err)
		os.Exit(1)
	}
	if comm == "" {
		fmt.Fprintf(os.Stderr, "expected non-empty comm\n")
		os.Exit(1)
	}

	// 4. proc.CmdLine() returns ([]string, error) where error is nil and args is non-empty
	cmdline, err := proc.CmdLine()
	if err != nil {
		fmt.Fprintf(os.Stderr, "proc.CmdLine() failed: %v\n", err)
		os.Exit(1)
	}
	if len(cmdline) == 0 {
		fmt.Fprintf(os.Stderr, "expected non-empty cmdline slice\n")
		os.Exit(1)
	}

	// 5. proc.Cwd() returns (string, error) where error is nil and cwd is non-empty
	cwd, err := proc.Cwd()
	if err != nil {
		fmt.Fprintf(os.Stderr, "proc.Cwd() failed: %v\n", err)
		os.Exit(1)
	}
	if cwd == "" {
		fmt.Fprintf(os.Stderr, "expected non-empty cwd\n")
		os.Exit(1)
	}

	// 6. proc.Limits() returns (ProcLimits, error) where error is nil and OpenFiles is positive
	limits, err := proc.Limits()
	if err != nil {
		fmt.Fprintf(os.Stderr, "proc.Limits() failed: %v\n", err)
		os.Exit(1)
	}
	if limits.OpenFiles == 0 {
		fmt.Fprintf(os.Stderr, "expected positive limits.OpenFiles, got %d\n", limits.OpenFiles)
		os.Exit(1)
	}

	fmt.Println("All contract assertions passed.")
}