Fix vendoring for go-execute

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/github.com/alexellis/go-execute/pkg/v1/exec.go

@@ -0,0 +1,117 @@
+package execute
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+type ExecTask struct {
+	Command string
+	Args    []string
+	Shell   bool
+	Env     []string
+	Cwd     string
+
+	// StreamStdio prints stdout and stderr directly to os.Stdout/err as
+	// the command runs.
+	StreamStdio bool
+
+	// PrintCommand prints the command before executing
+	PrintCommand bool
+}
+
+type ExecResult struct {
+	Stdout   string
+	Stderr   string
+	ExitCode int
+}
+
+func (et ExecTask) Execute() (ExecResult, error) {
+	argsSt := ""
+	if len(et.Args) > 0 {
+		argsSt = strings.Join(et.Args, " ")
+	}
+
+	if et.PrintCommand {
+		fmt.Println("exec: ", et.Command, argsSt)
+	}
+
+	var cmd *exec.Cmd
+
+	if et.Shell {
+		var args []string
+		if len(et.Args) == 0 {
+			startArgs := strings.Split(et.Command, " ")
+			script := strings.Join(startArgs, " ")
+			args = append([]string{"-c"}, fmt.Sprintf("%s", script))
+
+		} else {
+			script := strings.Join(et.Args, " ")
+			args = append([]string{"-c"}, fmt.Sprintf("%s %s", et.Command, script))
+
+		}
+
+		cmd = exec.Command("/bin/bash", args...)
+	} else {
+		if strings.Index(et.Command, " ") > 0 {
+			parts := strings.Split(et.Command, " ")
+			command := parts[0]
+			args := parts[1:]
+			cmd = exec.Command(command, args...)
+
+		} else {
+			cmd = exec.Command(et.Command, et.Args...)
+		}
+	}
+
+	cmd.Dir = et.Cwd
+
+	if len(et.Env) > 0 {
+		cmd.Env = os.Environ()
+		for _, env := range et.Env {
+			cmd.Env = append(cmd.Env, env)
+		}
+	}
+
+	stdoutBuff := bytes.Buffer{}
+	stderrBuff := bytes.Buffer{}
+
+	var stdoutWriters io.Writer
+	var stderrWriters io.Writer
+
+	if et.StreamStdio {
+		stdoutWriters = io.MultiWriter(os.Stdout, &stdoutBuff)
+		stderrWriters = io.MultiWriter(os.Stderr, &stderrBuff)
+	} else {
+		stdoutWriters = &stdoutBuff
+		stderrWriters = &stderrBuff
+	}
+
+	cmd.Stdout = stdoutWriters
+	cmd.Stderr = stderrWriters
+
+	startErr := cmd.Start()
+
+	if startErr != nil {
+		return ExecResult{}, startErr
+	}
+
+	exitCode := 0
+	execErr := cmd.Wait()
+	if execErr != nil {
+		if exitError, ok := execErr.(*exec.ExitError); ok {
+
+			exitCode = exitError.ExitCode()
+		}
+	}
+
+	return ExecResult{
+		Stdout:   string(stdoutBuff.Bytes()),
+		Stderr:   string(stderrBuff.Bytes()),
+		ExitCode: exitCode,
+	}, nil
+}