Add explicit privilege prompt to improve sudo UX

commands/stop.go

@@ -3,7 +3,6 @@ package commands
 import (
 	"fmt"
 
-	"github.com/fatih/color"
 	"github.com/phase2/rig/util"
 	"github.com/urfave/cli"
 )
@@ -58,15 +57,14 @@ func (cmd *Stop) StopOutrigger() error {
 	}
 	cmd.out.Info("Stopped machine '%s'", cmd.machine.Name)
 
-	cmd.out.Spin("Cleaning up local networking (may require your admin password)")
+	cmd.out.Spin("Cleaning up local networking...")
 	if util.IsWindows() {
 		util.Command("runas", "/noprofile", "/user:Administrator", "route", "DELETE", "172.17.0.0").Run()
 		util.Command("runas", "/noprofile", "/user:Administrator", "route", "DELETE", "172.17.42.1").Run()
 	} else {
-		util.Command("sudo", "route", "-n", "delete", "-net", "172.17.0.0").Run()
-		util.Command("sudo", "route", "-n", "delete", "-net", "172.17.42.1").Run()
+		util.Command("sudo", "-s", "--", "'", "cat", "/dev/null", ";", "route", "-n", "delete", "-net", "172.17.0.0", "'").Run()
+		util.Command("sudo", "-s", "--", "'", "cat", "/dev/null", ";", "route", "-n", "delete", "-net", "172.17.42.1", "'").Run()
 	}
-	color.Unset()
 	cmd.out.Info("Networking cleanup completed")
 
 	return cmd.Success(fmt.Sprintf("Machine '%s' stopped", cmd.machine.Name))

util/logger.go

@@ -1,11 +1,11 @@
 package util
 
 import (
+	"fmt"
 	"io/ioutil"
 	"log"
 	"os"
 
-	"fmt"
 	"github.com/fatih/color"
 	spun "github.com/slok/gospinner"
 )
@@ -24,10 +24,11 @@ type logChannels struct {
 
 // RigLogger is the global logger object
 type RigLogger struct {
-	Channel   logChannels
-	Progress  *RigSpinner
-	IsVerbose bool
-	Spinning  bool
+	Channel    logChannels
+	Progress   *RigSpinner
+	IsVerbose  bool
+	Spinning   bool
+	Privileged bool
 }
 
 // RigSpinner object wrapper to facilitate our spinner service
@@ -51,9 +52,10 @@ func LoggerInit(verbose bool) {
 			Error:   log.New(os.Stderr, color.RedString("[ERROR] "), 0),
 			Verbose: log.New(verboseWriter, "[VERBOSE] ", 0),
 		},
-		IsVerbose: verbose,
-		Progress:  &RigSpinner{s},
-		Spinning:  false,
+		IsVerbose:  verbose,
+		Progress:   &RigSpinner{s},
+		Spinning:   false,
+		Privileged: false,
 	}
 }
 
@@ -125,3 +127,24 @@ func (log *RigLogger) Verbose(format string, a ...interface{}) {
 func (log *RigLogger) Note(format string, a ...interface{}) {
 	log.Channel.Info.Println(fmt.Sprintf(format, a...))
 }
+
+// PrivilegeEscallationPrompt interrupts a running spinner to ensure clear
+// prompting to the user for sudo password entry. It is up to the caller to know
+// that privilege is needed. This prompt is only displayed on the first privilege
+// escallation of a given rig process.
+func (log *RigLogger) PrivilegeEscallationPrompt() {
+	defer func() { log.Privileged = true }()
+
+	if log.Privileged {
+		return
+	}
+
+	// This newline ensures the last status before escallation is preserved
+	// on-screen. It creates extraneous space in verbose mode.
+	if !log.IsVerbose {
+		fmt.Println()
+	}
+	message := "Administrative privileges needed..."
+	log.Spin(message)
+	log.Warning(message)
+}

util/shell_exec.go

@@ -92,36 +92,53 @@ func (x Executor) Execute(forceOutput bool) error {
 // CombinedOutput runs a command via exec.CombinedOutput() without modification or output of the underlying command.
 func (x Executor) CombinedOutput() ([]byte, error) {
 	x.Log("Executing")
+	if out := Logger(); out != nil && x.IsPrivileged() {
+		out.PrivilegeEscallationPrompt()
+		defer out.Spin("Resuming operation...")
+	}
 	return x.cmd.CombinedOutput()
 }
 
 // Run runs a command via exec.Run() without modification or output of the underlying command.
 func (x Executor) Run() error {
 	x.Log("Executing")
+	if out := Logger(); out != nil && x.IsPrivileged() {
+		out.PrivilegeEscallationPrompt()
+		defer out.Spin("Resuming operation...")
+	}
 	return x.cmd.Run()
 }
 
 // Output runs a command via exec.Output() without modification or output of the underlying command.
 func (x Executor) Output() ([]byte, error) {
 	x.Log("Executing")
+	if out := Logger(); out != nil && x.IsPrivileged() {
+		out.PrivilegeEscallationPrompt()
+		defer out.Spin("Resuming operation...")
+	}
 	return x.cmd.Output()
 }
 
 // Start runs a command via exec.Start() without modification or output of the underlying command.
 func (x Executor) Start() error {
 	x.Log("Executing")
+	if out := Logger(); out != nil && x.IsPrivileged() {
+		out.PrivilegeEscallationPrompt()
+		defer out.Spin("Resuming operation...")
+	}
 	return x.cmd.Start()
 }
 
 // Log verbosely logs the command.
 func (x Executor) Log(tag string) {
 	color.Set(color.FgMagenta)
-	Logger().Verbose("%s: %s", tag, x.ToString())
+	Logger().Verbose("%s: %s", tag, x)
 	color.Unset()
 }
 
-// ToString converts a Command to a human-readable string with key context details.
-func (x Executor) ToString() string {
+// String converts a Command to a human-readable string with key context details.
+// It is automatically applied in contexts such as fmt functions.
+func (x Executor) String() string {
 	context := ""
 	if x.cmd.Dir != "" {
 		context = fmt.Sprintf("(WD: %s", x.cmd.Dir)
@@ -137,3 +154,12 @@ func (x Executor) ToString() string {
 
 	return fmt.Sprintf("%s %s %s", x.cmd.Path, strings.Join(x.cmd.Args[1:], " "), context)
 }
+
+// IsPrivileged evaluates the command to determine if administrative privilege
+// is required.
+// @todo identify administrative escallation on Windows.
+// E.g., "runas", "/noprofile", "/user:Administrator
+func (x Executor) IsPrivileged() bool {
+	_, privileged := IndexOfSubstring(x.cmd.Args, "sudo")
+	return privileged
+}

util/slices.go

@@ -0,0 +1,30 @@
+package util
+
+import (
+	"strings"
+)
+
+// IndexOfString is a general utility function that can find the index of a value
+// present in a string slice. The second value is true if the item is found.
+func IndexOfString(slice []string, search string) (int, bool) {
+	for index, elem := range slice {
+		if elem == search {
+			return index, true
+		}
+	}
+
+	return 0, false
+}
+
+// IndexOfSubstring is a variation on IndexOfString which checks to see if a
+// given slice value matches our search string, or if that search string is
+// a substring of the element. The second value is true if the item is found.
+func IndexOfSubstring(slice []string, search string) (int, bool) {
+	for index, elem := range slice {
+		if strings.Contains(elem, search) {
+			return index, true
+		}
+	}
+
+	return 0, false
+}