Vendor in latest urfave/cli

The latest urfave/cli has the ability for us
to use short options when it is a bool.

Signed-off-by: baude <bbaude@redhat.com>

Closes: #100
Approved by: rhatdan

10 files changed, 439 insertions, 245 deletions

diff --git a/vendor/github.com/urfave/cli/README.md b/vendor/github.com/urfave/cli/README.md
index 2bbbd8ea9..6096701d8 100644
--- a/vendor/github.com/urfave/cli/README.md
+++ b/vendor/github.com/urfave/cli/README.md
@@ -32,7 +32,9 @@ applications in an expressive way.
     + [Alternate Names](#alternate-names)
     + [Ordering](#ordering)
     + [Values from the Environment](#values-from-the-environment)
+    + [Values from files](#values-from-files)
     + [Values from alternate input sources (YAML, TOML, and others)](#values-from-alternate-input-sources-yaml-toml-and-others)
+    + [Precedence](#precedence)
   * [Subcommands](#subcommands)
   * [Subcommands categories](#subcommands-categories)
   * [Exit code](#exit-code)
@@ -45,6 +47,7 @@ applications in an expressive way.
   * [Version Flag](#version-flag)
     + [Customization](#customization-2)
     + [Full API Example](#full-api-example)
+  * [Combining short Bool options](#combining-short-bool-options)
 - [Contribution Guidelines](#contribution-guidelines)
 
 <!-- tocstop -->
@@ -586,6 +589,41 @@ func main() {
 }
 ```
 
+#### Values from files
+
+You can also have the default value set from file via `FilePath`.  e.g.
+
+<!-- {
+  "args": ["&#45;&#45;help"],
+  "output": "password for the mysql database"
+} -->
+``` go
+package main
+
+import (
+  "os"
+
+  "github.com/urfave/cli"
+)
+
+func main() {
+  app := cli.NewApp()
+
+  app.Flags = []cli.Flag {
+    cli.StringFlag{
+      Name: "password, p",
+      Usage: "password for the mysql database",
+      FilePath: "/etc/mysql/password",
+    },
+  }
+
+  app.Run(os.Args)
+}
+```
+
+Note that default values set from file (e.g. `FilePath`) take precedence over
+default values set from the enviornment (e.g. `EnvVar`).
+
 #### Values from alternate input sources (YAML, TOML, and others)
 
 There is a separate package altsrc that adds support for getting flag values
@@ -656,6 +694,15 @@ func main() {
 }
 ```
 
+#### Precedence
+
+The precedence for flag value sources is as follows (highest to lowest):
+
+0. Command line flag value from user
+0. Environment variable (if specified)
+0. Configuration file (if specified)
+0. Default defined on the flag
+
 ### Subcommands
 
 Subcommands can be defined for a more git-like command line app.
@@ -751,11 +798,11 @@ func main() {
     },
     {
       Name:     "add",
-      Category: "template",
+      Category: "Template actions",
     },
     {
       Name:     "remove",
-      Category: "template",
+      Category: "Template actions",
     },
   }
 
@@ -1364,6 +1411,26 @@ func wopAction(c *cli.Context) error {
 }
 ```
 
+### Combining short Bool options
+
+Traditional use of boolean options using their shortnames look like this:
+```
+# cmd foobar -s -o
+```
+
+Suppose you want users to be able to combine your bool options with their shortname.  This
+can be done using the **UseShortOptionHandling** bool in your commands.  Suppose your program
+has a two bool flags such as *serve* and *option* with the short options of *-o* and
+*-s* respectively. With **UseShortOptionHandling** set to *true*, a user can use a syntax
+like:
+```
+# cmd foobar -so
+```
+
+If you enable the **UseShortOptionHandling*, then you must not use any flags that have a single
+leading *-* or this will result in failures.  For example, **-option** can no longer be used.  Flags
+with two leading dashes (such as **--options**) are still valid.
+
 ## Contribution Guidelines
 
 Feel free to put up a pull request to fix a bug or maybe add a feature. I will
diff --git a/vendor/github.com/urfave/cli/app.go b/vendor/github.com/urfave/cli/app.go
index 51fc45d87..9add067b0 100644
--- a/vendor/github.com/urfave/cli/app.go
+++ b/vendor/github.com/urfave/cli/app.go
@@ -83,6 +83,9 @@ type App struct {
 	Writer io.Writer
 	// ErrWriter writes error output
 	ErrWriter io.Writer
+	// Execute this function to handle ExitErrors. If not provided, HandleExitCoder is provided to
+	// function as a default, so this is optional.
+	ExitErrHandler ExitErrHandlerFunc
 	// Other custom info
 	Metadata map[string]interface{}
 	// Carries a function which returns app specific info.
@@ -207,7 +210,7 @@ func (a *App) Run(arguments []string) (err error) {
 	if err != nil {
 		if a.OnUsageError != nil {
 			err := a.OnUsageError(context, err, false)
-			HandleExitCoder(err)
+			a.handleExitCoder(context, err)
 			return err
 		}
 		fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
@@ -240,8 +243,9 @@ func (a *App) Run(arguments []string) (err error) {
 	if a.Before != nil {
 		beforeErr := a.Before(context)
 		if beforeErr != nil {
+			fmt.Fprintf(a.Writer, "%v\n\n", beforeErr)
 			ShowAppHelp(context)
-			HandleExitCoder(beforeErr)
+			a.handleExitCoder(context, beforeErr)
 			err = beforeErr
 			return err
 		}
@@ -263,7 +267,7 @@ func (a *App) Run(arguments []string) (err error) {
 	// Run default Action
 	err = HandleAction(a.Action, context)
 
-	HandleExitCoder(err)
+	a.handleExitCoder(context, err)
 	return err
 }
 
@@ -330,7 +334,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	if err != nil {
 		if a.OnUsageError != nil {
 			err = a.OnUsageError(context, err, true)
-			HandleExitCoder(err)
+			a.handleExitCoder(context, err)
 			return err
 		}
 		fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
@@ -352,7 +356,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 		defer func() {
 			afterErr := a.After(context)
 			if afterErr != nil {
-				HandleExitCoder(err)
+				a.handleExitCoder(context, err)
 				if err != nil {
 					err = NewMultiError(err, afterErr)
 				} else {
@@ -365,7 +369,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	if a.Before != nil {
 		beforeErr := a.Before(context)
 		if beforeErr != nil {
-			HandleExitCoder(beforeErr)
+			a.handleExitCoder(context, beforeErr)
 			err = beforeErr
 			return err
 		}
@@ -383,7 +387,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	// Run default Action
 	err = HandleAction(a.Action, context)
 
-	HandleExitCoder(err)
+	a.handleExitCoder(context, err)
 	return err
 }
 
@@ -449,7 +453,6 @@ func (a *App) hasFlag(flag Flag) bool {
 }
 
 func (a *App) errWriter() io.Writer {
-
 	// When the app ErrWriter is nil use the package level one.
 	if a.ErrWriter == nil {
 		return ErrWriter
@@ -464,6 +467,14 @@ func (a *App) appendFlag(flag Flag) {
 	}
 }
 
+func (a *App) handleExitCoder(context *Context, err error) {
+	if a.ExitErrHandler != nil {
+		a.ExitErrHandler(context, err)
+	} else {
+		HandleExitCoder(err)
+	}
+}
+
 // Author represents someone who has contributed to a cli project.
 type Author struct {
 	Name  string // The Authors name
@@ -491,7 +502,7 @@ func HandleAction(action interface{}, context *Context) (err error) {
 	} else if a, ok := action.(func(*Context)); ok { // deprecated function signature
 		a(context)
 		return nil
-	} else {
-		return errInvalidActionType
 	}
+
+	return errInvalidActionType
 }
diff --git a/vendor/github.com/urfave/cli/category.go b/vendor/github.com/urfave/cli/category.go
index 1a6055023..bf3c73c55 100644
--- a/vendor/github.com/urfave/cli/category.go
+++ b/vendor/github.com/urfave/cli/category.go
@@ -10,7 +10,7 @@ type CommandCategory struct {
 }
 
 func (c CommandCategories) Less(i, j int) bool {
-	return c[i].Name < c[j].Name
+	return lexicographicLess(c[i].Name, c[j].Name)
 }
 
 func (c CommandCategories) Len() int {
diff --git a/vendor/github.com/urfave/cli/command.go b/vendor/github.com/urfave/cli/command.go
index 23de2944b..7d0357bd0 100644
--- a/vendor/github.com/urfave/cli/command.go
+++ b/vendor/github.com/urfave/cli/command.go
@@ -55,6 +55,10 @@ type Command struct {
 	HideHelp bool
 	// Boolean to hide this command from help or completion
 	Hidden bool
+	// Boolean to enable short-option handling so user can combine several
+	// single-character bool arguements into one
+	// i.e. foobar -o -v -> foobar -ov
+	UseShortOptionHandling bool
 
 	// Full name of command for help, defaults to full command name, including parent commands.
 	HelpName        string
@@ -73,7 +77,7 @@ func (c CommandsByName) Len() int {
 }
 
 func (c CommandsByName) Less(i, j int) bool {
-	return c[i].Name < c[j].Name
+	return lexicographicLess(c[i].Name, c[j].Name)
 }
 
 func (c CommandsByName) Swap(i, j int) {
@@ -111,43 +115,29 @@ func (c Command) Run(ctx *Context) (err error) {
 		return err
 	}
 	set.SetOutput(ioutil.Discard)
-
+	firstFlagIndex, terminatorIndex := getIndexes(ctx)
+	flagArgs, regularArgs := getAllArgs(ctx.Args(), firstFlagIndex, terminatorIndex)
+	if c.UseShortOptionHandling {
+		flagArgs = translateShortOptions(flagArgs)
+	}
 	if c.SkipFlagParsing {
 		err = set.Parse(append([]string{"--"}, ctx.Args().Tail()...))
 	} else if !c.SkipArgReorder {
-		firstFlagIndex := -1
-		terminatorIndex := -1
-		for index, arg := range ctx.Args() {
-			if arg == "--" {
-				terminatorIndex = index
-				break
-			} else if arg == "-" {
-				// Do nothing. A dash alone is not really a flag.
-				continue
-			} else if strings.HasPrefix(arg, "-") && firstFlagIndex == -1 {
-				firstFlagIndex = index
-			}
-		}
-
 		if firstFlagIndex > -1 {
-			args := ctx.Args()
-			regularArgs := make([]string, len(args[1:firstFlagIndex]))
-			copy(regularArgs, args[1:firstFlagIndex])
-
-			var flagArgs []string
-			if terminatorIndex > -1 {
-				flagArgs = args[firstFlagIndex:terminatorIndex]
-				regularArgs = append(regularArgs, args[terminatorIndex:]...)
-			} else {
-				flagArgs = args[firstFlagIndex:]
-			}
-
 			err = set.Parse(append(flagArgs, regularArgs...))
 		} else {
 			err = set.Parse(ctx.Args().Tail())
 		}
+	} else if c.UseShortOptionHandling {
+		if terminatorIndex == -1 && firstFlagIndex > -1 {
+			// Handle shortname AND no options
+			err = set.Parse(append(regularArgs, flagArgs...))
+		} else {
+			// Handle shortname and options
+			err = set.Parse(flagArgs)
+		}
 	} else {
-		err = set.Parse(ctx.Args().Tail())
+		err = set.Parse(append(regularArgs, flagArgs...))
 	}
 
 	nerr := normalizeFlags(c.Flags, set)
@@ -167,7 +157,7 @@ func (c Command) Run(ctx *Context) (err error) {
 	if err != nil {
 		if c.OnUsageError != nil {
 			err := c.OnUsageError(context, err, false)
-			HandleExitCoder(err)
+			context.App.handleExitCoder(context, err)
 			return err
 		}
 		fmt.Fprintln(context.App.Writer, "Incorrect Usage:", err.Error())
@@ -184,7 +174,7 @@ func (c Command) Run(ctx *Context) (err error) {
 		defer func() {
 			afterErr := c.After(context)
 			if afterErr != nil {
-				HandleExitCoder(err)
+				context.App.handleExitCoder(context, err)
 				if err != nil {
 					err = NewMultiError(err, afterErr)
 				} else {
@@ -198,7 +188,7 @@ func (c Command) Run(ctx *Context) (err error) {
 		err = c.Before(context)
 		if err != nil {
 			ShowCommandHelp(context, c.Name)
-			HandleExitCoder(err)
+			context.App.handleExitCoder(context, err)
 			return err
 		}
 	}
@@ -210,11 +200,82 @@ func (c Command) Run(ctx *Context) (err error) {
 	err = HandleAction(c.Action, context)
 
 	if err != nil {
-		HandleExitCoder(err)
+		context.App.handleExitCoder(context, err)
 	}
 	return err
 }
 
+func getIndexes(ctx *Context) (int, int) {
+	firstFlagIndex := -1
+	terminatorIndex := -1
+	for index, arg := range ctx.Args() {
+		if arg == "--" {
+			terminatorIndex = index
+			break
+		} else if arg == "-" {
+			// Do nothing. A dash alone is not really a flag.
+			continue
+		} else if strings.HasPrefix(arg, "-") && firstFlagIndex == -1 {
+			firstFlagIndex = index
+		}
+	}
+	if len(ctx.Args()) > 0 && !strings.HasPrefix(ctx.Args()[0], "-") && firstFlagIndex == -1 {
+		return -1, -1
+	}
+
+	return firstFlagIndex, terminatorIndex
+
+}
+
+// copyStringslice takes a string slice and copies it
+func copyStringSlice(slice []string, start, end int) []string {
+	newSlice := make([]string, end-start)
+	copy(newSlice, slice[start:end])
+	return newSlice
+}
+
+// getAllArgs extracts and returns two string slices representing
+// regularArgs and flagArgs
+func getAllArgs(args []string, firstFlagIndex, terminatorIndex int) ([]string, []string) {
+	var regularArgs []string
+	// if there are no options, the we set the index to 1 manually
+	if firstFlagIndex == -1 {
+		firstFlagIndex = 1
+		regularArgs = copyStringSlice(args, 0, len(args))
+	} else {
+		regularArgs = copyStringSlice(args, 1, firstFlagIndex)
+	}
+	var flagArgs []string
+	// a flag terminatorIndex was found in the input. we need to collect
+	// flagArgs based on it.
+	if terminatorIndex > -1 {
+		flagArgs = copyStringSlice(args, firstFlagIndex, terminatorIndex)
+		additionalRegularArgs := copyStringSlice(args, terminatorIndex, len(args))
+		regularArgs = append(regularArgs, additionalRegularArgs...)
+		for _, i := range additionalRegularArgs {
+			regularArgs = append(regularArgs, i)
+		}
+	} else {
+		flagArgs = args[firstFlagIndex:]
+	}
+	return flagArgs, regularArgs
+}
+
+func translateShortOptions(flagArgs Args) []string {
+	// separate combined flags
+	var flagArgsSeparated []string
+	for _, flagArg := range flagArgs {
+		if strings.HasPrefix(flagArg, "-") && strings.HasPrefix(flagArg, "--") == false && len(flagArg) > 2 {
+			for _, flagChar := range flagArg[1:] {
+				flagArgsSeparated = append(flagArgsSeparated, "-"+string(flagChar))
+			}
+		} else {
+			flagArgsSeparated = append(flagArgsSeparated, flagArg)
+		}
+	}
+	return flagArgsSeparated
+}
+
 // Names returns the names including short names and aliases.
 func (c Command) Names() []string {
 	names := []string{c.Name}
diff --git a/vendor/github.com/urfave/cli/context.go b/vendor/github.com/urfave/cli/context.go
index db94191e2..552ee7405 100644
--- a/vendor/github.com/urfave/cli/context.go
+++ b/vendor/github.com/urfave/cli/context.go
@@ -3,6 +3,7 @@ package cli
 import (
 	"errors"
 	"flag"
+	"os"
 	"reflect"
 	"strings"
 	"syscall"
@@ -73,7 +74,7 @@ func (c *Context) IsSet(name string) bool {
 		// change in version 2 to add `IsSet` to the Flag interface to push the
 		// responsibility closer to where the information required to determine
 		// whether a flag is set by non-standard means such as environment
-		// variables is avaliable.
+		// variables is available.
 		//
 		// See https://github.com/urfave/cli/issues/294 for additional discussion
 		flags := c.Command.Flags
@@ -93,18 +94,26 @@ func (c *Context) IsSet(name string) bool {
 					val = val.Elem()
 				}
 
-				envVarValue := val.FieldByName("EnvVar")
-				if !envVarValue.IsValid() {
-					return
+				filePathValue := val.FieldByName("FilePath")
+				if filePathValue.IsValid() {
+					eachName(filePathValue.String(), func(filePath string) {
+						if _, err := os.Stat(filePath); err == nil {
+							c.setFlags[name] = true
+							return
+						}
+					})
 				}
 
-				eachName(envVarValue.String(), func(envVar string) {
-					envVar = strings.TrimSpace(envVar)
-					if _, ok := syscall.Getenv(envVar); ok {
-						c.setFlags[name] = true
-						return
-					}
-				})
+				envVarValue := val.FieldByName("EnvVar")
+				if envVarValue.IsValid() {
+					eachName(envVarValue.String(), func(envVar string) {
+						envVar = strings.TrimSpace(envVar)
+						if _, ok := syscall.Getenv(envVar); ok {
+							c.setFlags[name] = true
+							return
+						}
+					})
+				}
 			})
 		}
 	}
diff --git a/vendor/github.com/urfave/cli/flag.go b/vendor/github.com/urfave/cli/flag.go
index 877ff3523..d4a4d41a2 100644
--- a/vendor/github.com/urfave/cli/flag.go
+++ b/vendor/github.com/urfave/cli/flag.go
@@ -3,6 +3,7 @@ package cli
 import (
 	"flag"
 	"fmt"
+	"io/ioutil"
 	"reflect"
 	"runtime"
 	"strconv"
@@ -37,6 +38,18 @@ var HelpFlag Flag = BoolFlag{
 // to display a flag.
 var FlagStringer FlagStringFunc = stringifyFlag
 
+// FlagNamePrefixer converts a full flag name and its placeholder into the help
+// message flag prefix. This is used by the default FlagStringer.
+var FlagNamePrefixer FlagNamePrefixFunc = prefixedNames
+
+// FlagEnvHinter annotates flag help message with the environment variable
+// details. This is used by the default FlagStringer.
+var FlagEnvHinter FlagEnvHintFunc = withEnvHint
+
+// FlagFileHinter annotates flag help message with the environment variable
+// details. This is used by the default FlagStringer.
+var FlagFileHinter FlagFileHintFunc = withFileHint
+
 // FlagsByName is a slice of Flag.
 type FlagsByName []Flag
 
@@ -45,7 +58,7 @@ func (f FlagsByName) Len() int {
 }
 
 func (f FlagsByName) Less(i, j int) bool {
-	return f[i].GetName() < f[j].GetName()
+	return lexicographicLess(f[i].GetName(), f[j].GetName())
 }
 
 func (f FlagsByName) Swap(i, j int) {
@@ -112,15 +125,9 @@ func (f GenericFlag) Apply(set *flag.FlagSet) {
 // provided by the user for parsing by the flag
 func (f GenericFlag) ApplyWithError(set *flag.FlagSet) error {
 	val := f.Value
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				if err := val.Set(envVal); err != nil {
-					return fmt.Errorf("could not parse %s as value for flag %s: %s", envVal, f.Name, err)
-				}
-				break
-			}
+	if fileEnvVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		if err := val.Set(fileEnvVal); err != nil {
+			return fmt.Errorf("could not parse %s as value for flag %s: %s", fileEnvVal, f.Name, err)
 		}
 	}
 
@@ -163,21 +170,19 @@ func (f StringSliceFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f StringSliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := &StringSlice{}
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					if err := newVal.Set(s); err != nil {
-						return fmt.Errorf("could not parse %s as string value for flag %s: %s", envVal, f.Name, err)
-					}
-				}
-				f.Value = newVal
-				break
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		newVal := &StringSlice{}
+		for _, s := range strings.Split(envVal, ",") {
+			s = strings.TrimSpace(s)
+			if err := newVal.Set(s); err != nil {
+				return fmt.Errorf("could not parse %s as string value for flag %s: %s", envVal, f.Name, err)
 			}
 		}
+		if f.Value == nil {
+			f.Value = newVal
+		} else {
+			*f.Value = *newVal
+		}
 	}
 
 	eachName(f.Name, func(name string) {
@@ -226,21 +231,19 @@ func (f IntSliceFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f IntSliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := &IntSlice{}
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					if err := newVal.Set(s); err != nil {
-						return fmt.Errorf("could not parse %s as int slice value for flag %s: %s", envVal, f.Name, err)
-					}
-				}
-				f.Value = newVal
-				break
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		newVal := &IntSlice{}
+		for _, s := range strings.Split(envVal, ",") {
+			s = strings.TrimSpace(s)
+			if err := newVal.Set(s); err != nil {
+				return fmt.Errorf("could not parse %s as int slice value for flag %s: %s", envVal, f.Name, err)
 			}
 		}
+		if f.Value == nil {
+			f.Value = newVal
+		} else {
+			*f.Value = *newVal
+		}
 	}
 
 	eachName(f.Name, func(name string) {
@@ -289,21 +292,19 @@ func (f Int64SliceFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f Int64SliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := &Int64Slice{}
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					if err := newVal.Set(s); err != nil {
-						return fmt.Errorf("could not parse %s as int64 slice value for flag %s: %s", envVal, f.Name, err)
-					}
-				}
-				f.Value = newVal
-				break
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		newVal := &Int64Slice{}
+		for _, s := range strings.Split(envVal, ",") {
+			s = strings.TrimSpace(s)
+			if err := newVal.Set(s); err != nil {
+				return fmt.Errorf("could not parse %s as int64 slice value for flag %s: %s", envVal, f.Name, err)
 			}
 		}
+		if f.Value == nil {
+			f.Value = newVal
+		} else {
+			*f.Value = *newVal
+		}
 	}
 
 	eachName(f.Name, func(name string) {
@@ -324,23 +325,15 @@ func (f BoolFlag) Apply(set *flag.FlagSet) {
 // ApplyWithError populates the flag given the flag set and environment
 func (f BoolFlag) ApplyWithError(set *flag.FlagSet) error {
 	val := false
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				if envVal == "" {
-					val = false
-					break
-				}
-
-				envValBool, err := strconv.ParseBool(envVal)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as bool value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				val = envValBool
-				break
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		if envVal == "" {
+			val = false
+		} else {
+			envValBool, err := strconv.ParseBool(envVal)
+			if err != nil {
+				return fmt.Errorf("could not parse %s as bool value for flag %s: %s", envVal, f.Name, err)
 			}
+			val = envValBool
 		}
 	}
 
@@ -364,23 +357,16 @@ func (f BoolTFlag) Apply(set *flag.FlagSet) {
 // ApplyWithError populates the flag given the flag set and environment
 func (f BoolTFlag) ApplyWithError(set *flag.FlagSet) error {
 	val := true
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				if envVal == "" {
-					val = false
-					break
-				}
 
-				envValBool, err := strconv.ParseBool(envVal)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as bool value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				val = envValBool
-				break
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		if envVal == "" {
+			val = false
+		} else {
+			envValBool, err := strconv.ParseBool(envVal)
+			if err != nil {
+				return fmt.Errorf("could not parse %s as bool value for flag %s: %s", envVal, f.Name, err)
 			}
+			val = envValBool
 		}
 	}
 
@@ -403,14 +389,8 @@ func (f StringFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f StringFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				f.Value = envVal
-				break
-			}
-		}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		f.Value = envVal
 	}
 
 	eachName(f.Name, func(name string) {
@@ -432,18 +412,12 @@ func (f IntFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f IntFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseInt(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as int value for flag %s: %s", envVal, f.Name, err)
-				}
-				f.Value = int(envValInt)
-				break
-			}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		envValInt, err := strconv.ParseInt(envVal, 0, 64)
+		if err != nil {
+			return fmt.Errorf("could not parse %s as int value for flag %s: %s", envVal, f.Name, err)
 		}
+		f.Value = int(envValInt)
 	}
 
 	eachName(f.Name, func(name string) {
@@ -465,19 +439,13 @@ func (f Int64Flag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f Int64Flag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseInt(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as int value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = envValInt
-				break
-			}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		envValInt, err := strconv.ParseInt(envVal, 0, 64)
+		if err != nil {
+			return fmt.Errorf("could not parse %s as int value for flag %s: %s", envVal, f.Name, err)
 		}
+
+		f.Value = envValInt
 	}
 
 	eachName(f.Name, func(name string) {
@@ -499,19 +467,13 @@ func (f UintFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f UintFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseUint(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as uint value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = uint(envValInt)
-				break
-			}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		envValInt, err := strconv.ParseUint(envVal, 0, 64)
+		if err != nil {
+			return fmt.Errorf("could not parse %s as uint value for flag %s: %s", envVal, f.Name, err)
 		}
+
+		f.Value = uint(envValInt)
 	}
 
 	eachName(f.Name, func(name string) {
@@ -533,19 +495,13 @@ func (f Uint64Flag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f Uint64Flag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseUint(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as uint64 value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = uint64(envValInt)
-				break
-			}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		envValInt, err := strconv.ParseUint(envVal, 0, 64)
+		if err != nil {
+			return fmt.Errorf("could not parse %s as uint64 value for flag %s: %s", envVal, f.Name, err)
 		}
+
+		f.Value = uint64(envValInt)
 	}
 
 	eachName(f.Name, func(name string) {
@@ -567,19 +523,13 @@ func (f DurationFlag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f DurationFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValDuration, err := time.ParseDuration(envVal)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as duration for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = envValDuration
-				break
-			}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		envValDuration, err := time.ParseDuration(envVal)
+		if err != nil {
+			return fmt.Errorf("could not parse %s as duration for flag %s: %s", envVal, f.Name, err)
 		}
+
+		f.Value = envValDuration
 	}
 
 	eachName(f.Name, func(name string) {
@@ -601,19 +551,13 @@ func (f Float64Flag) Apply(set *flag.FlagSet) {
 
 // ApplyWithError populates the flag given the flag set and environment
 func (f Float64Flag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVar != "" {
-		for _, envVar := range strings.Split(f.EnvVar, ",") {
-			envVar = strings.TrimSpace(envVar)
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValFloat, err := strconv.ParseFloat(envVal, 10)
-				if err != nil {
-					return fmt.Errorf("could not parse %s as float64 value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = float64(envValFloat)
-				break
-			}
+	if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
+		envValFloat, err := strconv.ParseFloat(envVal, 10)
+		if err != nil {
+			return fmt.Errorf("could not parse %s as float64 value for flag %s: %s", envVal, f.Name, err)
 		}
+
+		f.Value = float64(envValFloat)
 	}
 
 	eachName(f.Name, func(name string) {
@@ -697,6 +641,14 @@ func withEnvHint(envVar, str string) string {
 	return str + envText
 }
 
+func withFileHint(filePath, str string) string {
+	fileText := ""
+	if filePath != "" {
+		fileText = fmt.Sprintf(" [%s]", filePath)
+	}
+	return str + fileText
+}
+
 func flagValue(f Flag) reflect.Value {
 	fv := reflect.ValueOf(f)
 	for fv.Kind() == reflect.Ptr {
@@ -710,14 +662,29 @@ func stringifyFlag(f Flag) string {
 
 	switch f.(type) {
 	case IntSliceFlag:
-		return withEnvHint(fv.FieldByName("EnvVar").String(),
-			stringifyIntSliceFlag(f.(IntSliceFlag)))
+		return FlagFileHinter(
+			fv.FieldByName("FilePath").String(),
+			FlagEnvHinter(
+				fv.FieldByName("EnvVar").String(),
+				stringifyIntSliceFlag(f.(IntSliceFlag)),
+			),
+		)
 	case Int64SliceFlag:
-		return withEnvHint(fv.FieldByName("EnvVar").String(),
-			stringifyInt64SliceFlag(f.(Int64SliceFlag)))
+		return FlagFileHinter(
+			fv.FieldByName("FilePath").String(),
+			FlagEnvHinter(
+				fv.FieldByName("EnvVar").String(),
+				stringifyInt64SliceFlag(f.(Int64SliceFlag)),
+			),
+		)
 	case StringSliceFlag:
-		return withEnvHint(fv.FieldByName("EnvVar").String(),
-			stringifyStringSliceFlag(f.(StringSliceFlag)))
+		return FlagFileHinter(
+			fv.FieldByName("FilePath").String(),
+			FlagEnvHinter(
+				fv.FieldByName("EnvVar").String(),
+				stringifyStringSliceFlag(f.(StringSliceFlag)),
+			),
+		)
 	}
 
 	placeholder, usage := unquoteUsage(fv.FieldByName("Usage").String())
@@ -744,8 +711,13 @@ func stringifyFlag(f Flag) string {
 
 	usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, defaultValueString))
 
-	return withEnvHint(fv.FieldByName("EnvVar").String(),
-		fmt.Sprintf("%s\t%s", prefixedNames(fv.FieldByName("Name").String(), placeholder), usageWithDefault))
+	return FlagFileHinter(
+		fv.FieldByName("FilePath").String(),
+		FlagEnvHinter(
+			fv.FieldByName("EnvVar").String(),
+			fmt.Sprintf("%s\t%s", FlagNamePrefixer(fv.FieldByName("Name").String(), placeholder), usageWithDefault),
+		),
+	)
 }
 
 func stringifyIntSliceFlag(f IntSliceFlag) string {
@@ -795,5 +767,20 @@ func stringifySliceFlag(usage, name string, defaultVals []string) string {
 	}
 
 	usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, defaultVal))
-	return fmt.Sprintf("%s\t%s", prefixedNames(name, placeholder), usageWithDefault)
+	return fmt.Sprintf("%s\t%s", FlagNamePrefixer(name, placeholder), usageWithDefault)
+}
+
+func flagFromFileEnv(filePath, envName string) (val string, ok bool) {
+	for _, envVar := range strings.Split(envName, ",") {
+		envVar = strings.TrimSpace(envVar)
+		if envVal, ok := syscall.Getenv(envVar); ok {
+			return envVal, true
+		}
+	}
+	for _, fileVar := range strings.Split(filePath, ",") {
+		if data, err := ioutil.ReadFile(fileVar); err == nil {
+			return string(data), true
+		}
+	}
+	return "", false
 }
diff --git a/vendor/github.com/urfave/cli/flag_generated.go b/vendor/github.com/urfave/cli/flag_generated.go
index 491b61956..001576c8b 100644
--- a/vendor/github.com/urfave/cli/flag_generated.go
+++ b/vendor/github.com/urfave/cli/flag_generated.go
@@ -13,6 +13,7 @@ type BoolFlag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Destination *bool
 }
@@ -60,6 +61,7 @@ type BoolTFlag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Destination *bool
 }
@@ -107,6 +109,7 @@ type DurationFlag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       time.Duration
 	Destination *time.Duration
@@ -155,6 +158,7 @@ type Float64Flag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       float64
 	Destination *float64
@@ -200,11 +204,12 @@ func lookupFloat64(name string, set *flag.FlagSet) float64 {
 
 // GenericFlag is a flag with type Generic
 type GenericFlag struct {
-	Name   string
-	Usage  string
-	EnvVar string
-	Hidden bool
-	Value  Generic
+	Name     string
+	Usage    string
+	EnvVar   string
+	FilePath string
+	Hidden   bool
+	Value    Generic
 }
 
 // String returns a readable representation of this value
@@ -250,6 +255,7 @@ type Int64Flag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       int64
 	Destination *int64
@@ -298,6 +304,7 @@ type IntFlag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       int
 	Destination *int
@@ -343,11 +350,12 @@ func lookupInt(name string, set *flag.FlagSet) int {
 
 // IntSliceFlag is a flag with type *IntSlice
 type IntSliceFlag struct {
-	Name   string
-	Usage  string
-	EnvVar string
-	Hidden bool
-	Value  *IntSlice
+	Name     string
+	Usage    string
+	EnvVar   string
+	FilePath string
+	Hidden   bool
+	Value    *IntSlice
 }
 
 // String returns a readable representation of this value
@@ -390,11 +398,12 @@ func lookupIntSlice(name string, set *flag.FlagSet) []int {
 
 // Int64SliceFlag is a flag with type *Int64Slice
 type Int64SliceFlag struct {
-	Name   string
-	Usage  string
-	EnvVar string
-	Hidden bool
-	Value  *Int64Slice
+	Name     string
+	Usage    string
+	EnvVar   string
+	FilePath string
+	Hidden   bool
+	Value    *Int64Slice
 }
 
 // String returns a readable representation of this value
@@ -440,6 +449,7 @@ type StringFlag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       string
 	Destination *string
@@ -485,11 +495,12 @@ func lookupString(name string, set *flag.FlagSet) string {
 
 // StringSliceFlag is a flag with type *StringSlice
 type StringSliceFlag struct {
-	Name   string
-	Usage  string
-	EnvVar string
-	Hidden bool
-	Value  *StringSlice
+	Name     string
+	Usage    string
+	EnvVar   string
+	FilePath string
+	Hidden   bool
+	Value    *StringSlice
 }
 
 // String returns a readable representation of this value
@@ -535,6 +546,7 @@ type Uint64Flag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       uint64
 	Destination *uint64
@@ -583,6 +595,7 @@ type UintFlag struct {
 	Name        string
 	Usage       string
 	EnvVar      string
+	FilePath    string
 	Hidden      bool
 	Value       uint
 	Destination *uint
diff --git a/vendor/github.com/urfave/cli/funcs.go b/vendor/github.com/urfave/cli/funcs.go
index cba5e6cb0..0036b1130 100644
--- a/vendor/github.com/urfave/cli/funcs.go
+++ b/vendor/github.com/urfave/cli/funcs.go
@@ -23,6 +23,22 @@ type CommandNotFoundFunc func(*Context, string)
 // is displayed and the execution is interrupted.
 type OnUsageErrorFunc func(context *Context, err error, isSubcommand bool) error
 
+// ExitErrHandlerFunc is executed if provided in order to handle ExitError values
+// returned by Actions and Before/After functions.
+type ExitErrHandlerFunc func(context *Context, err error)
+
 // FlagStringFunc is used by the help generation to display a flag, which is
 // expected to be a single line.
 type FlagStringFunc func(Flag) string
+
+// FlagNamePrefixFunc is used by the default FlagStringFunc to create prefix
+// text for a flag's full name.
+type FlagNamePrefixFunc func(fullName, placeholder string) string
+
+// FlagEnvHintFunc is used by the default FlagStringFunc to annotate flag help
+// with the environment variable details.
+type FlagEnvHintFunc func(envVar, str string) string
+
+// FlagFileHintFunc is used by the default FlagStringFunc to annotate flag help
+// with the file path details.
+type FlagFileHintFunc func(filePath, str string) string
diff --git a/vendor/github.com/urfave/cli/help.go b/vendor/github.com/urfave/cli/help.go
index 57ec98d58..ed084fc1d 100644
--- a/vendor/github.com/urfave/cli/help.go
+++ b/vendor/github.com/urfave/cli/help.go
@@ -29,6 +29,7 @@ AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
    {{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
 
 COMMANDS:{{range .VisibleCategories}}{{if .Name}}
+
    {{.Name}}:{{end}}{{range .VisibleCommands}}
      {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
 
diff --git a/vendor/github.com/urfave/cli/sort.go b/vendor/github.com/urfave/cli/sort.go
new file mode 100644
index 000000000..23d1c2f77
--- /dev/null
+++ b/vendor/github.com/urfave/cli/sort.go
@@ -0,0 +1,29 @@
+package cli
+
+import "unicode"
+
+// lexicographicLess compares strings alphabetically considering case.
+func lexicographicLess(i, j string) bool {
+	iRunes := []rune(i)
+	jRunes := []rune(j)
+
+	lenShared := len(iRunes)
+	if lenShared > len(jRunes) {
+		lenShared = len(jRunes)
+	}
+
+	for index := 0; index < lenShared; index++ {
+		ir := iRunes[index]
+		jr := jRunes[index]
+
+		if lir, ljr := unicode.ToLower(ir), unicode.ToLower(jr); lir != ljr {
+			return lir < ljr
+		}
+
+		if ir != jr {
+			return ir < jr
+		}
+	}
+
+	return i < j
+}