remove package process

Fixes https://github.com/tendermint/tmlibs/issues/81

That package is untested and racy, and not used except in
a test, but even that's now gutted with
  https://github.com/tendermint/abci/pull/139
so the general consensus is that we sunset this package.

process/process.go

@@ -1,76 +0,0 @@
-package process
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"os/exec"
-	"time"
-)
-
-type Process struct {
-	Label      string
-	ExecPath   string
-	Args       []string
-	Pid        int
-	StartTime  time.Time
-	EndTime    time.Time
-	Cmd        *exec.Cmd        `json:"-"`
-	ExitState  *os.ProcessState `json:"-"`
-	InputFile  io.Reader        `json:"-"`
-	OutputFile io.WriteCloser   `json:"-"`
-	WaitCh     chan struct{}    `json:"-"`
-}
-
-// execPath: command name
-// args: args to command. (should not include name)
-func StartProcess(label string, dir string, execPath string, args []string, inFile io.Reader, outFile io.WriteCloser) (*Process, error) {
-	cmd := exec.Command(execPath, args...)
-	cmd.Dir = dir
-	cmd.Stdout = outFile
-	cmd.Stderr = outFile
-	cmd.Stdin = inFile
-	if err := cmd.Start(); err != nil {
-		return nil, err
-	}
-	proc := &Process{
-		Label:      label,
-		ExecPath:   execPath,
-		Args:       args,
-		Pid:        cmd.Process.Pid,
-		StartTime:  time.Now(),
-		Cmd:        cmd,
-		ExitState:  nil,
-		InputFile:  inFile,
-		OutputFile: outFile,
-		WaitCh:     make(chan struct{}),
-	}
-	go func() {
-		err := proc.Cmd.Wait()
-		if err != nil {
-			// fmt.Printf("Process exit: %v\n", err)
-			if exitError, ok := err.(*exec.ExitError); ok {
-				proc.ExitState = exitError.ProcessState
-			}
-		}
-		proc.ExitState = proc.Cmd.ProcessState
-		proc.EndTime = time.Now() // TODO make this goroutine-safe
-		err = proc.OutputFile.Close()
-		if err != nil {
-			fmt.Printf("Error closing output file for %v: %v\n", proc.Label, err)
-		}
-		close(proc.WaitCh)
-	}()
-	return proc, nil
-}
-
-func (proc *Process) StopProcess(kill bool) error {
-	defer proc.OutputFile.Close()
-	if kill {
-		// fmt.Printf("Killing process %v\n", proc.Cmd.Process)
-		return proc.Cmd.Process.Kill()
-	} else {
-		// fmt.Printf("Stopping process %v\n", proc.Cmd.Process)
-		return proc.Cmd.Process.Signal(os.Interrupt)
-	}
-}

process/util.go

@@ -1,22 +0,0 @@
-package process
-
-import (
-	. "github.com/tendermint/tmlibs/common"
-)
-
-// Runs a command and gets the result.
-func Run(dir string, command string, args []string) (string, bool, error) {
-	outFile := NewBufferCloser(nil)
-	proc, err := StartProcess("", dir, command, args, nil, outFile)
-	if err != nil {
-		return "", false, err
-	}
-
-	<-proc.WaitCh
-
-	if proc.ExitState.Success() {
-		return outFile.String(), true, nil
-	} else {
-		return outFile.String(), false, nil
-	}
-}