Provide a simple way to debug an integration test

vendor/github.com/mitchellh/go-ps/process_unix.go

@@ -0,0 +1,95 @@
+// +build linux solaris
+
+package ps
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+)
+
+// UnixProcess is an implementation of Process that contains Unix-specific
+// fields and information.
+type UnixProcess struct {
+	pid   int
+	ppid  int
+	state rune
+	pgrp  int
+	sid   int
+
+	binary string
+}
+
+func (p *UnixProcess) Pid() int {
+	return p.pid
+}
+
+func (p *UnixProcess) PPid() int {
+	return p.ppid
+}
+
+func (p *UnixProcess) Executable() string {
+	return p.binary
+}
+
+func findProcess(pid int) (Process, error) {
+	dir := fmt.Sprintf("/proc/%d", pid)
+	_, err := os.Stat(dir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+
+		return nil, err
+	}
+
+	return newUnixProcess(pid)
+}
+
+func processes() ([]Process, error) {
+	d, err := os.Open("/proc")
+	if err != nil {
+		return nil, err
+	}
+	defer d.Close()
+
+	results := make([]Process, 0, 50)
+	for {
+		names, err := d.Readdirnames(10)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		for _, name := range names {
+			// We only care if the name starts with a numeric
+			if name[0] < '0' || name[0] > '9' {
+				continue
+			}
+
+			// From this point forward, any errors we just ignore, because
+			// it might simply be that the process doesn't exist anymore.
+			pid, err := strconv.ParseInt(name, 10, 0)
+			if err != nil {
+				continue
+			}
+
+			p, err := newUnixProcess(int(pid))
+			if err != nil {
+				continue
+			}
+
+			results = append(results, p)
+		}
+	}
+
+	return results, nil
+}
+
+func newUnixProcess(pid int) (*UnixProcess, error) {
+	p := &UnixProcess{pid: pid}
+	return p, p.Refresh()
+}