1 files changed, 0 insertions, 406 deletions

diff --git a/cli/internal/process/child.go b/cli/internal/process/child.go
deleted file mode 100644
index 1c3e6e7..0000000
--- a/cli/internal/process/child.go
+++ /dev/null
@@ -1,406 +0,0 @@
-package process
-
-/**
- * Code in this file is based on the source code at
- * https://github.com/hashicorp/consul-template/tree/3ea7d99ad8eff17897e0d63dac86d74770170bb8/child/child.go
- *
- * Major changes include removing the ability to restart a child process,
- * requiring a fully-formed exec.Cmd to be passed in, and including cmd.Dir
- * in the description of a child process.
- */
-
-import (
-	"errors"
-	"fmt"
-	"math/rand"
-	"os"
-	"os/exec"
-	"strings"
-	"sync"
-	"syscall"
-	"time"
-
-	"github.com/hashicorp/go-hclog"
-)
-
-func init() {
-	// Seed the default rand Source with current time to produce better random
-	// numbers used with splay
-	rand.Seed(time.Now().UnixNano())
-}
-
-var (
-	// ErrMissingCommand is the error returned when no command is specified
-	// to run.
-	ErrMissingCommand = errors.New("missing command")
-
-	// ExitCodeOK is the default OK exit code.
-	ExitCodeOK = 0
-
-	// ExitCodeError is the default error code returned when the child exits with
-	// an error without a more specific code.
-	ExitCodeError = 127
-)
-
-// Child is a wrapper around a child process which can be used to send signals
-// and manage the processes' lifecycle.
-type Child struct {
-	sync.RWMutex
-
-	timeout time.Duration
-
-	killSignal  os.Signal
-	killTimeout time.Duration
-
-	splay time.Duration
-
-	// cmd is the actual child process under management.
-	cmd *exec.Cmd
-
-	// exitCh is the channel where the processes exit will be returned.
-	exitCh chan int
-
-	// stopLock is the mutex to lock when stopping. stopCh is the circuit breaker
-	// to force-terminate any waiting splays to kill the process now. stopped is
-	// a boolean that tells us if we have previously been stopped.
-	stopLock sync.RWMutex
-	stopCh   chan struct{}
-	stopped  bool
-
-	// whether to set process group id or not (default on)
-	setpgid bool
-
-	Label string
-
-	logger hclog.Logger
-}
-
-// NewInput is input to the NewChild function.
-type NewInput struct {
-	// Cmd is the unstarted, preconfigured command to run
-	Cmd *exec.Cmd
-
-	// Timeout is the maximum amount of time to allow the command to execute. If
-	// set to 0, the command is permitted to run infinitely.
-	Timeout time.Duration
-
-	// KillSignal is the signal to send to gracefully kill this process. This
-	// value may be nil.
-	KillSignal os.Signal
-
-	// KillTimeout is the amount of time to wait for the process to gracefully
-	// terminate before force-killing.
-	KillTimeout time.Duration
-
-	// Splay is the maximum random amount of time to wait before sending signals.
-	// This option helps reduce the thundering herd problem by effectively
-	// sleeping for a random amount of time before sending the signal. This
-	// prevents multiple processes from all signaling at the same time. This value
-	// may be zero (which disables the splay entirely).
-	Splay time.Duration
-
-	// Logger receives debug log lines about the process state and transitions
-	Logger hclog.Logger
-}
-
-// New creates a new child process for management with high-level APIs for
-// sending signals to the child process, restarting the child process, and
-// gracefully terminating the child process.
-func newChild(i NewInput) (*Child, error) {
-	// exec.Command prepends the command to be run to the arguments list, so
-	// we only need the arguments here, it will include the command itself.
-	label := fmt.Sprintf("(%v) %v", i.Cmd.Dir, strings.Join(i.Cmd.Args, " "))
-	child := &Child{
-		cmd:         i.Cmd,
-		timeout:     i.Timeout,
-		killSignal:  i.KillSignal,
-		killTimeout: i.KillTimeout,
-		splay:       i.Splay,
-		stopCh:      make(chan struct{}, 1),
-		setpgid:     true,
-		Label:       label,
-		logger:      i.Logger.Named(label),
-	}
-
-	return child, nil
-}
-
-// ExitCh returns the current exit channel for this child process. This channel
-// may change if the process is restarted, so implementers must not cache this
-// value.
-func (c *Child) ExitCh() <-chan int {
-	c.RLock()
-	defer c.RUnlock()
-	return c.exitCh
-}
-
-// Pid returns the pid of the child process. If no child process exists, 0 is
-// returned.
-func (c *Child) Pid() int {
-	c.RLock()
-	defer c.RUnlock()
-	return c.pid()
-}
-
-// Command returns the human-formatted command with arguments.
-func (c *Child) Command() string {
-	return c.Label
-}
-
-// Start starts and begins execution of the child process. A buffered channel
-// is returned which is where the command's exit code will be returned upon
-// exit. Any errors that occur prior to starting the command will be returned
-// as the second error argument, but any errors returned by the command after
-// execution will be returned as a non-zero value over the exit code channel.
-func (c *Child) Start() error {
-	// log.Printf("[INFO] (child) spawning: %s", c.Command())
-	c.Lock()
-	defer c.Unlock()
-	return c.start()
-}
-
-// Signal sends the signal to the child process, returning any errors that
-// occur.
-func (c *Child) Signal(s os.Signal) error {
-	c.logger.Debug("receiving signal %q", s.String())
-	c.RLock()
-	defer c.RUnlock()
-	return c.signal(s)
-}
-
-// Kill sends the kill signal to the child process and waits for successful
-// termination. If no kill signal is defined, the process is killed with the
-// most aggressive kill signal. If the process does not gracefully stop within
-// the provided KillTimeout, the process is force-killed. If a splay was
-// provided, this function will sleep for a random period of time between 0 and
-// the provided splay value to reduce the thundering herd problem. This function
-// does not return any errors because it guarantees the process will be dead by
-// the return of the function call.
-func (c *Child) Kill() {
-	c.logger.Debug("killing process")
-	c.Lock()
-	defer c.Unlock()
-	c.kill(false)
-}
-
-// Stop behaves almost identical to Kill except it suppresses future processes
-// from being started by this child and it prevents the killing of the child
-// process from sending its value back up the exit channel. This is useful
-// when doing a graceful shutdown of an application.
-func (c *Child) Stop() {
-	c.internalStop(false)
-}
-
-// StopImmediately behaves almost identical to Stop except it does not wait
-// for any random splay if configured. This is used for performing a fast
-// shutdown of consul-template and its children when a kill signal is received.
-func (c *Child) StopImmediately() {
-	c.internalStop(true)
-}
-
-func (c *Child) internalStop(immediately bool) {
-	c.Lock()
-	defer c.Unlock()
-
-	c.stopLock.Lock()
-	defer c.stopLock.Unlock()
-	if c.stopped {
-		return
-	}
-	c.kill(immediately)
-	close(c.stopCh)
-	c.stopped = true
-}
-
-func (c *Child) start() error {
-	setSetpgid(c.cmd, c.setpgid)
-	if err := c.cmd.Start(); err != nil {
-		return err
-	}
-
-	// Create a new exitCh so that previously invoked commands (if any) don't
-	// cause us to exit, and start a goroutine to wait for that process to end.
-	exitCh := make(chan int, 1)
-	go func() {
-		var code int
-		// It's possible that kill is called before we even
-		// manage to get here. Make sure we still have a valid
-		// cmd before waiting on it.
-		c.RLock()
-		var cmd = c.cmd
-		c.RUnlock()
-		var err error
-		if cmd != nil {
-			err = cmd.Wait()
-		}
-		if err == nil {
-			code = ExitCodeOK
-		} else {
-			code = ExitCodeError
-			if exiterr, ok := err.(*exec.ExitError); ok {
-				if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
-					code = status.ExitStatus()
-				}
-			}
-		}
-
-		// If the child is in the process of killing, do not send a response back
-		// down the exit channel.
-		c.stopLock.RLock()
-		defer c.stopLock.RUnlock()
-		if !c.stopped {
-			select {
-			case <-c.stopCh:
-			case exitCh <- code:
-			}
-		}
-
-		close(exitCh)
-	}()
-
-	c.exitCh = exitCh
-
-	// If a timeout was given, start the timer to wait for the child to exit
-	if c.timeout != 0 {
-		select {
-		case code := <-exitCh:
-			if code != 0 {
-				return fmt.Errorf(
-					"command exited with a non-zero exit status:\n"+
-						"\n"+
-						"    %s\n"+
-						"\n"+
-						"This is assumed to be a failure. Please ensure the command\n"+
-						"exits with a zero exit status.",
-					c.Command(),
-				)
-			}
-		case <-time.After(c.timeout):
-			// Force-kill the process
-			c.stopLock.Lock()
-			defer c.stopLock.Unlock()
-			if c.cmd != nil && c.cmd.Process != nil {
-				c.cmd.Process.Kill()
-			}
-
-			return fmt.Errorf(
-				"command did not exit within %q:\n"+
-					"\n"+
-					"    %s\n"+
-					"\n"+
-					"Commands must exit in a timely manner in order for processing to\n"+
-					"continue. Consider using a process supervisor or utilizing the\n"+
-					"built-in exec mode instead.",
-				c.timeout,
-				c.Command(),
-			)
-		}
-	}
-
-	return nil
-}
-
-func (c *Child) pid() int {
-	if !c.running() {
-		return 0
-	}
-	return c.cmd.Process.Pid
-}
-
-func (c *Child) signal(s os.Signal) error {
-	if !c.running() {
-		return nil
-	}
-
-	sig, ok := s.(syscall.Signal)
-	if !ok {
-		return fmt.Errorf("bad signal: %s", s)
-	}
-	pid := c.cmd.Process.Pid
-	if c.setpgid {
-		// kill takes negative pid to indicate that you want to use gpid
-		pid = -(pid)
-	}
-	// cross platform way to signal process/process group
-	p, err := os.FindProcess(pid)
-	if err != nil {
-		return err
-	}
-	return p.Signal(sig)
-}
-
-// kill sends the signal to kill the process using the configured signal
-// if set, else the default system signal
-func (c *Child) kill(immediately bool) {
-
-	if !c.running() {
-		c.logger.Debug("Kill() called but process dead; not waiting for splay.")
-		return
-	} else if immediately {
-		c.logger.Debug("Kill() called but performing immediate shutdown; not waiting for splay.")
-	} else {
-		c.logger.Debug("Kill(%v) called", immediately)
-		select {
-		case <-c.stopCh:
-		case <-c.randomSplay():
-		}
-	}
-
-	var exited bool
-	defer func() {
-		if !exited {
-			c.logger.Debug("PKill")
-			c.cmd.Process.Kill()
-		}
-		c.cmd = nil
-	}()
-
-	if c.killSignal == nil {
-		return
-	}
-
-	if err := c.signal(c.killSignal); err != nil {
-		c.logger.Debug("Kill failed: %s", err)
-		if processNotFoundErr(err) {
-			exited = true // checked in defer
-		}
-		return
-	}
-
-	killCh := make(chan struct{}, 1)
-	go func() {
-		defer close(killCh)
-		c.cmd.Process.Wait()
-	}()
-
-	select {
-	case <-c.stopCh:
-	case <-killCh:
-		exited = true
-	case <-time.After(c.killTimeout):
-		c.logger.Debug("timeout")
-	}
-}
-
-func (c *Child) running() bool {
-	select {
-	case <-c.exitCh:
-		return false
-	default:
-	}
-	return c.cmd != nil && c.cmd.Process != nil
-}
-
-func (c *Child) randomSplay() <-chan time.Time {
-	if c.splay == 0 {
-		return time.After(0)
-	}
-
-	ns := c.splay.Nanoseconds()
-	offset := rand.Int63n(ns)
-	t := time.Duration(offset)
-
-	c.logger.Debug("waiting %.2fs for random splay", t.Seconds())
-
-	return time.After(t)
-}