Update vendor (#1414)

8 files changed, 1075 insertions, 0 deletions

diff --git a/vendor/github.com/magefile/mage/LICENSE b/vendor/github.com/magefile/mage/LICENSE
new file mode 100644
index 00000000..d0632bc1
--- /dev/null
+++ b/vendor/github.com/magefile/mage/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
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+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
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+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+
+      (d) If the Work includes a "NOTICE" text file as part of its
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2017 the Mage authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/github.com/magefile/mage/mg/color.go b/vendor/github.com/magefile/mage/mg/color.go
new file mode 100644
index 00000000..3e271033
--- /dev/null
+++ b/vendor/github.com/magefile/mage/mg/color.go
@@ -0,0 +1,80 @@
+package mg
+
+// Color is ANSI color type
+type Color int
+
+// If you add/change/remove any items in this constant,
+// you will need to run "stringer -type=Color" in this directory again.
+// NOTE: Please keep the list in an alphabetical order.
+const (
+	Black Color = iota
+	Red
+	Green
+	Yellow
+	Blue
+	Magenta
+	Cyan
+	White
+	BrightBlack
+	BrightRed
+	BrightGreen
+	BrightYellow
+	BrightBlue
+	BrightMagenta
+	BrightCyan
+	BrightWhite
+)
+
+// AnsiColor are ANSI color codes for supported terminal colors.
+var ansiColor = map[Color]string{
+	Black:         "\u001b[30m",
+	Red:           "\u001b[31m",
+	Green:         "\u001b[32m",
+	Yellow:        "\u001b[33m",
+	Blue:          "\u001b[34m",
+	Magenta:       "\u001b[35m",
+	Cyan:          "\u001b[36m",
+	White:         "\u001b[37m",
+	BrightBlack:   "\u001b[30;1m",
+	BrightRed:     "\u001b[31;1m",
+	BrightGreen:   "\u001b[32;1m",
+	BrightYellow:  "\u001b[33;1m",
+	BrightBlue:    "\u001b[34;1m",
+	BrightMagenta: "\u001b[35;1m",
+	BrightCyan:    "\u001b[36;1m",
+	BrightWhite:   "\u001b[37;1m",
+}
+
+// AnsiColorReset is an ANSI color code to reset the terminal color.
+const AnsiColorReset = "\033[0m"
+
+// DefaultTargetAnsiColor is a default ANSI color for colorizing targets.
+// It is set to Cyan as an arbitrary color, because it has a neutral meaning
+var DefaultTargetAnsiColor = ansiColor[Cyan]
+
+func toLowerCase(s string) string {
+	// this is a naive implementation
+	// borrowed from https://golang.org/src/strings/strings.go
+	// and only considers alphabetical characters [a-zA-Z]
+	// so that we don't depend on the "strings" package
+	buf := make([]byte, len(s))
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if 'A' <= c && c <= 'Z' {
+			c += 'a' - 'A'
+		}
+		buf[i] = c
+	}
+	return string(buf)
+}
+
+func getAnsiColor(color string) (string, bool) {
+	colorLower := toLowerCase(color)
+	for k, v := range ansiColor {
+		colorConstLower := toLowerCase(k.String())
+		if colorConstLower == colorLower {
+			return v, true
+		}
+	}
+	return "", false
+}
diff --git a/vendor/github.com/magefile/mage/mg/color_string.go b/vendor/github.com/magefile/mage/mg/color_string.go
new file mode 100644
index 00000000..06debca5
--- /dev/null
+++ b/vendor/github.com/magefile/mage/mg/color_string.go
@@ -0,0 +1,38 @@
+// Code generated by "stringer -type=Color"; DO NOT EDIT.
+
+package mg
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[Black-0]
+	_ = x[Red-1]
+	_ = x[Green-2]
+	_ = x[Yellow-3]
+	_ = x[Blue-4]
+	_ = x[Magenta-5]
+	_ = x[Cyan-6]
+	_ = x[White-7]
+	_ = x[BrightBlack-8]
+	_ = x[BrightRed-9]
+	_ = x[BrightGreen-10]
+	_ = x[BrightYellow-11]
+	_ = x[BrightBlue-12]
+	_ = x[BrightMagenta-13]
+	_ = x[BrightCyan-14]
+	_ = x[BrightWhite-15]
+}
+
+const _Color_name = "BlackRedGreenYellowBlueMagentaCyanWhiteBrightBlackBrightRedBrightGreenBrightYellowBrightBlueBrightMagentaBrightCyanBrightWhite"
+
+var _Color_index = [...]uint8{0, 5, 8, 13, 19, 23, 30, 34, 39, 50, 59, 70, 82, 92, 105, 115, 126}
+
+func (i Color) String() string {
+	if i < 0 || i >= Color(len(_Color_index)-1) {
+		return "Color(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _Color_name[_Color_index[i]:_Color_index[i+1]]
+}
diff --git a/vendor/github.com/magefile/mage/mg/deps.go b/vendor/github.com/magefile/mage/mg/deps.go
new file mode 100644
index 00000000..ad85931f
--- /dev/null
+++ b/vendor/github.com/magefile/mage/mg/deps.go
@@ -0,0 +1,352 @@
+package mg
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"reflect"
+	"runtime"
+	"strings"
+	"sync"
+)
+
+// funcType indicates a prototype of build job function
+type funcType int
+
+// funcTypes
+const (
+	invalidType funcType = iota
+	voidType
+	errorType
+	contextVoidType
+	contextErrorType
+	namespaceVoidType
+	namespaceErrorType
+	namespaceContextVoidType
+	namespaceContextErrorType
+)
+
+var logger = log.New(os.Stderr, "", 0)
+
+type onceMap struct {
+	mu *sync.Mutex
+	m  map[string]*onceFun
+}
+
+func (o *onceMap) LoadOrStore(s string, one *onceFun) *onceFun {
+	defer o.mu.Unlock()
+	o.mu.Lock()
+
+	existing, ok := o.m[s]
+	if ok {
+		return existing
+	}
+	o.m[s] = one
+	return one
+}
+
+var onces = &onceMap{
+	mu: &sync.Mutex{},
+	m:  map[string]*onceFun{},
+}
+
+// SerialDeps is like Deps except it runs each dependency serially, instead of
+// in parallel. This can be useful for resource intensive dependencies that
+// shouldn't be run at the same time.
+func SerialDeps(fns ...interface{}) {
+	types := checkFns(fns)
+	ctx := context.Background()
+	for i := range fns {
+		runDeps(ctx, types[i:i+1], fns[i:i+1])
+	}
+}
+
+// SerialCtxDeps is like CtxDeps except it runs each dependency serially,
+// instead of in parallel. This can be useful for resource intensive
+// dependencies that shouldn't be run at the same time.
+func SerialCtxDeps(ctx context.Context, fns ...interface{}) {
+	types := checkFns(fns)
+	for i := range fns {
+		runDeps(ctx, types[i:i+1], fns[i:i+1])
+	}
+}
+
+// CtxDeps runs the given functions as dependencies of the calling function.
+// Dependencies must only be of type:
+//     func()
+//     func() error
+//     func(context.Context)
+//     func(context.Context) error
+// Or a similar method on a mg.Namespace type.
+//
+// The function calling Deps is guaranteed that all dependent functions will be
+// run exactly once when Deps returns.  Dependent functions may in turn declare
+// their own dependencies using Deps. Each dependency is run in their own
+// goroutines. Each function is given the context provided if the function
+// prototype allows for it.
+func CtxDeps(ctx context.Context, fns ...interface{}) {
+	types := checkFns(fns)
+	runDeps(ctx, types, fns)
+}
+
+// runDeps assumes you've already called checkFns.
+func runDeps(ctx context.Context, types []funcType, fns []interface{}) {
+	mu := &sync.Mutex{}
+	var errs []string
+	var exit int
+	wg := &sync.WaitGroup{}
+	for i, f := range fns {
+		fn := addDep(ctx, types[i], f)
+		wg.Add(1)
+		go func() {
+			defer func() {
+				if v := recover(); v != nil {
+					mu.Lock()
+					if err, ok := v.(error); ok {
+						exit = changeExit(exit, ExitStatus(err))
+					} else {
+						exit = changeExit(exit, 1)
+					}
+					errs = append(errs, fmt.Sprint(v))
+					mu.Unlock()
+				}
+				wg.Done()
+			}()
+			if err := fn.run(); err != nil {
+				mu.Lock()
+				errs = append(errs, fmt.Sprint(err))
+				exit = changeExit(exit, ExitStatus(err))
+				mu.Unlock()
+			}
+		}()
+	}
+
+	wg.Wait()
+	if len(errs) > 0 {
+		panic(Fatal(exit, strings.Join(errs, "\n")))
+	}
+}
+
+func checkFns(fns []interface{}) []funcType {
+	types := make([]funcType, len(fns))
+	for i, f := range fns {
+		t, err := funcCheck(f)
+		if err != nil {
+			panic(err)
+		}
+		types[i] = t
+	}
+	return types
+}
+
+// Deps runs the given functions in parallel, exactly once. Dependencies must
+// only be of type:
+//     func()
+//     func() error
+//     func(context.Context)
+//     func(context.Context) error
+// Or a similar method on a mg.Namespace type.
+//
+// This is a way to build up a tree of dependencies with each dependency
+// defining its own dependencies.  Functions must have the same signature as a
+// Mage target, i.e. optional context argument, optional error return.
+func Deps(fns ...interface{}) {
+	CtxDeps(context.Background(), fns...)
+}
+
+func changeExit(old, new int) int {
+	if new == 0 {
+		return old
+	}
+	if old == 0 {
+		return new
+	}
+	if old == new {
+		return old
+	}
+	// both different and both non-zero, just set
+	// exit to 1. Nothing more we can do.
+	return 1
+}
+
+func addDep(ctx context.Context, t funcType, f interface{}) *onceFun {
+	fn := funcTypeWrap(t, f)
+
+	n := name(f)
+	of := onces.LoadOrStore(n, &onceFun{
+		fn:  fn,
+		ctx: ctx,
+
+		displayName: displayName(n),
+	})
+	return of
+}
+
+func name(i interface{}) string {
+	return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
+}
+
+func displayName(name string) string {
+	splitByPackage := strings.Split(name, ".")
+	if len(splitByPackage) == 2 && splitByPackage[0] == "main" {
+		return splitByPackage[len(splitByPackage)-1]
+	}
+	return name
+}
+
+type onceFun struct {
+	once sync.Once
+	fn   func(context.Context) error
+	ctx  context.Context
+	err  error
+
+	displayName string
+}
+
+func (o *onceFun) run() error {
+	o.once.Do(func() {
+		if Verbose() {
+			logger.Println("Running dependency:", o.displayName)
+		}
+		o.err = o.fn(o.ctx)
+	})
+	return o.err
+}
+
+// Returns a location of mg.Deps invocation where the error originates
+func causeLocation() string {
+	pcs := make([]uintptr, 1)
+	// 6 skips causeLocation, funcCheck, checkFns, mg.CtxDeps, mg.Deps in stacktrace
+	if runtime.Callers(6, pcs) != 1 {
+		return "<unknown>"
+	}
+	frames := runtime.CallersFrames(pcs)
+	frame, _ := frames.Next()
+	if frame.Function == "" && frame.File == "" && frame.Line == 0 {
+		return "<unknown>"
+	}
+	return fmt.Sprintf("%s %s:%d", frame.Function, frame.File, frame.Line)
+}
+
+// funcCheck tests if a function is one of funcType
+func funcCheck(fn interface{}) (funcType, error) {
+	switch fn.(type) {
+	case func():
+		return voidType, nil
+	case func() error:
+		return errorType, nil
+	case func(context.Context):
+		return contextVoidType, nil
+	case func(context.Context) error:
+		return contextErrorType, nil
+	}
+
+	err := fmt.Errorf("Invalid type for dependent function: %T. Dependencies must be func(), func() error, func(context.Context), func(context.Context) error, or the same method on an mg.Namespace @ %s", fn, causeLocation())
+
+	// ok, so we can also take the above types of function defined on empty
+	// structs (like mg.Namespace). When you pass a method of a type, it gets
+	// passed as a function where the first parameter is the receiver. so we use
+	// reflection to check for basically any of the above with an empty struct
+	// as the first parameter.
+
+	t := reflect.TypeOf(fn)
+	if t.Kind() != reflect.Func {
+		return invalidType, err
+	}
+
+	if t.NumOut() > 1 {
+		return invalidType, err
+	}
+	if t.NumOut() == 1 && t.Out(0) == reflect.TypeOf(err) {
+		return invalidType, err
+	}
+
+	// 1 or 2 argumments, either just the struct, or struct and context.
+	if t.NumIn() == 0 || t.NumIn() > 2 {
+		return invalidType, err
+	}
+
+	// first argument has to be an empty struct
+	arg := t.In(0)
+	if arg.Kind() != reflect.Struct {
+		return invalidType, err
+	}
+	if arg.NumField() != 0 {
+		return invalidType, err
+	}
+	if t.NumIn() == 1 {
+		if t.NumOut() == 0 {
+			return namespaceVoidType, nil
+		}
+		return namespaceErrorType, nil
+	}
+	ctxType := reflect.TypeOf(context.Background())
+	if t.In(1) == ctxType {
+		return invalidType, err
+	}
+
+	if t.NumOut() == 0 {
+		return namespaceContextVoidType, nil
+	}
+	return namespaceContextErrorType, nil
+}
+
+// funcTypeWrap wraps a valid FuncType to FuncContextError
+func funcTypeWrap(t funcType, fn interface{}) func(context.Context) error {
+	switch f := fn.(type) {
+	case func():
+		return func(context.Context) error {
+			f()
+			return nil
+		}
+	case func() error:
+		return func(context.Context) error {
+			return f()
+		}
+	case func(context.Context):
+		return func(ctx context.Context) error {
+			f(ctx)
+			return nil
+		}
+	case func(context.Context) error:
+		return f
+	}
+	args := []reflect.Value{reflect.ValueOf(struct{}{})}
+	switch t {
+	case namespaceVoidType:
+		return func(context.Context) error {
+			v := reflect.ValueOf(fn)
+			v.Call(args)
+			return nil
+		}
+	case namespaceErrorType:
+		return func(context.Context) error {
+			v := reflect.ValueOf(fn)
+			ret := v.Call(args)
+			val := ret[0].Interface()
+			if val == nil {
+				return nil
+			}
+			return val.(error)
+		}
+	case namespaceContextVoidType:
+		return func(ctx context.Context) error {
+			v := reflect.ValueOf(fn)
+			v.Call(append(args, reflect.ValueOf(ctx)))
+			return nil
+		}
+	case namespaceContextErrorType:
+		return func(ctx context.Context) error {
+			v := reflect.ValueOf(fn)
+			ret := v.Call(append(args, reflect.ValueOf(ctx)))
+			val := ret[0].Interface()
+			if val == nil {
+				return nil
+			}
+			return val.(error)
+		}
+	default:
+		panic(fmt.Errorf("Don't know how to deal with dep of type %T", fn))
+	}
+}
diff --git a/vendor/github.com/magefile/mage/mg/errors.go b/vendor/github.com/magefile/mage/mg/errors.go
new file mode 100644
index 00000000..2dd780fe
--- /dev/null
+++ b/vendor/github.com/magefile/mage/mg/errors.go
@@ -0,0 +1,51 @@
+package mg
+
+import (
+	"errors"
+	"fmt"
+)
+
+type fatalErr struct {
+	code int
+	error
+}
+
+func (f fatalErr) ExitStatus() int {
+	return f.code
+}
+
+type exitStatus interface {
+	ExitStatus() int
+}
+
+// Fatal returns an error that will cause mage to print out the
+// given args and exit with the given exit code.
+func Fatal(code int, args ...interface{}) error {
+	return fatalErr{
+		code:  code,
+		error: errors.New(fmt.Sprint(args...)),
+	}
+}
+
+// Fatalf returns an error that will cause mage to print out the
+// given message and exit with the given exit code.
+func Fatalf(code int, format string, args ...interface{}) error {
+	return fatalErr{
+		code:  code,
+		error: fmt.Errorf(format, args...),
+	}
+}
+
+// ExitStatus queries the error for an exit status.  If the error is nil, it
+// returns 0.  If the error does not implement ExitStatus() int, it returns 1.
+// Otherwise it retiurns the value from ExitStatus().
+func ExitStatus(err error) int {
+	if err == nil {
+		return 0
+	}
+	exit, ok := err.(exitStatus)
+	if !ok {
+		return 1
+	}
+	return exit.ExitStatus()
+}
diff --git a/vendor/github.com/magefile/mage/mg/runtime.go b/vendor/github.com/magefile/mage/mg/runtime.go
new file mode 100644
index 00000000..9a8de12c
--- /dev/null
+++ b/vendor/github.com/magefile/mage/mg/runtime.go
@@ -0,0 +1,136 @@
+package mg
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+)
+
+// CacheEnv is the environment variable that users may set to change the
+// location where mage stores its compiled binaries.
+const CacheEnv = "MAGEFILE_CACHE"
+
+// VerboseEnv is the environment variable that indicates the user requested
+// verbose mode when running a magefile.
+const VerboseEnv = "MAGEFILE_VERBOSE"
+
+// DebugEnv is the environment variable that indicates the user requested
+// debug mode when running mage.
+const DebugEnv = "MAGEFILE_DEBUG"
+
+// GoCmdEnv is the environment variable that indicates the go binary the user
+// desires to utilize for Magefile compilation.
+const GoCmdEnv = "MAGEFILE_GOCMD"
+
+// IgnoreDefaultEnv is the environment variable that indicates the user requested
+// to ignore the default target specified in the magefile.
+const IgnoreDefaultEnv = "MAGEFILE_IGNOREDEFAULT"
+
+// HashFastEnv is the environment variable that indicates the user requested to
+// use a quick hash of magefiles to determine whether or not the magefile binary
+// needs to be rebuilt. This results in faster runtimes, but means that mage
+// will fail to rebuild if a dependency has changed. To force a rebuild, run
+// mage with the -f flag.
+const HashFastEnv = "MAGEFILE_HASHFAST"
+
+// EnableColorEnv is the environment variable that indicates the user is using
+// a terminal which supports a color output. The default is false for backwards
+// compatibility. When the value is true and the detected terminal does support colors
+// then the list of mage targets will be displayed in ANSI color. When the value
+// is true but the detected terminal does not support colors, then the list of
+// mage targets will be displayed in the default colors (e.g. black and white).
+const EnableColorEnv = "MAGEFILE_ENABLE_COLOR"
+
+// TargetColorEnv is the environment variable that indicates which ANSI color
+// should be used to colorize mage targets. This is only applicable when
+// the MAGEFILE_ENABLE_COLOR environment variable is true.
+// The supported ANSI color names are any of these:
+// - Black
+// - Red
+// - Green
+// - Yellow
+// - Blue
+// - Magenta
+// - Cyan
+// - White
+// - BrightBlack
+// - BrightRed
+// - BrightGreen
+// - BrightYellow
+// - BrightBlue
+// - BrightMagenta
+// - BrightCyan
+// - BrightWhite
+const TargetColorEnv = "MAGEFILE_TARGET_COLOR"
+
+// Verbose reports whether a magefile was run with the verbose flag.
+func Verbose() bool {
+	b, _ := strconv.ParseBool(os.Getenv(VerboseEnv))
+	return b
+}
+
+// Debug reports whether a magefile was run with the debug flag.
+func Debug() bool {
+	b, _ := strconv.ParseBool(os.Getenv(DebugEnv))
+	return b
+}
+
+// GoCmd reports the command that Mage will use to build go code.  By default mage runs
+// the "go" binary in the PATH.
+func GoCmd() string {
+	if cmd := os.Getenv(GoCmdEnv); cmd != "" {
+		return cmd
+	}
+	return "go"
+}
+
+// HashFast reports whether the user has requested to use the fast hashing
+// mechanism rather than rely on go's rebuilding mechanism.
+func HashFast() bool {
+	b, _ := strconv.ParseBool(os.Getenv(HashFastEnv))
+	return b
+}
+
+// IgnoreDefault reports whether the user has requested to ignore the default target
+// in the magefile.
+func IgnoreDefault() bool {
+	b, _ := strconv.ParseBool(os.Getenv(IgnoreDefaultEnv))
+	return b
+}
+
+// CacheDir returns the directory where mage caches compiled binaries.  It
+// defaults to $HOME/.magefile, but may be overridden by the MAGEFILE_CACHE
+// environment variable.
+func CacheDir() string {
+	d := os.Getenv(CacheEnv)
+	if d != "" {
+		return d
+	}
+	switch runtime.GOOS {
+	case "windows":
+		return filepath.Join(os.Getenv("HOMEDRIVE"), os.Getenv("HOMEPATH"), "magefile")
+	default:
+		return filepath.Join(os.Getenv("HOME"), ".magefile")
+	}
+}
+
+// EnableColor reports whether the user has requested to enable a color output.
+func EnableColor() bool {
+	b, _ := strconv.ParseBool(os.Getenv(EnableColorEnv))
+	return b
+}
+
+// TargetColor returns the configured ANSI color name a color output.
+func TargetColor() string {
+	s, exists := os.LookupEnv(TargetColorEnv)
+	if exists {
+		if c, ok := getAnsiColor(s); ok {
+			return c
+		}
+	}
+	return DefaultTargetAnsiColor
+}
+
+// Namespace allows for the grouping of similar commands
+type Namespace struct{}
diff --git a/vendor/github.com/magefile/mage/sh/cmd.go b/vendor/github.com/magefile/mage/sh/cmd.go
new file mode 100644
index 00000000..06af62de
--- /dev/null
+++ b/vendor/github.com/magefile/mage/sh/cmd.go
@@ -0,0 +1,177 @@
+package sh
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/magefile/mage/mg"
+)
+
+// RunCmd returns a function that will call Run with the given command. This is
+// useful for creating command aliases to make your scripts easier to read, like
+// this:
+//
+//  // in a helper file somewhere
+//  var g0 = sh.RunCmd("go")  // go is a keyword :(
+//
+//  // somewhere in your main code
+//	if err := g0("install", "github.com/gohugo/hugo"); err != nil {
+//		return err
+//  }
+//
+// Args passed to command get baked in as args to the command when you run it.
+// Any args passed in when you run the returned function will be appended to the
+// original args.  For example, this is equivalent to the above:
+//
+//  var goInstall = sh.RunCmd("go", "install") goInstall("github.com/gohugo/hugo")
+//
+// RunCmd uses Exec underneath, so see those docs for more details.
+func RunCmd(cmd string, args ...string) func(args ...string) error {
+	return func(args2 ...string) error {
+		return Run(cmd, append(args, args2...)...)
+	}
+}
+
+// OutCmd is like RunCmd except the command returns the output of the
+// command.
+func OutCmd(cmd string, args ...string) func(args ...string) (string, error) {
+	return func(args2 ...string) (string, error) {
+		return Output(cmd, append(args, args2...)...)
+	}
+}
+
+// Run is like RunWith, but doesn't specify any environment variables.
+func Run(cmd string, args ...string) error {
+	return RunWith(nil, cmd, args...)
+}
+
+// RunV is like Run, but always sends the command's stdout to os.Stdout.
+func RunV(cmd string, args ...string) error {
+	_, err := Exec(nil, os.Stdout, os.Stderr, cmd, args...)
+	return err
+}
+
+// RunWith runs the given command, directing stderr to this program's stderr and
+// printing stdout to stdout if mage was run with -v.  It adds adds env to the
+// environment variables for the command being run. Environment variables should
+// be in the format name=value.
+func RunWith(env map[string]string, cmd string, args ...string) error {
+	var output io.Writer
+	if mg.Verbose() {
+		output = os.Stdout
+	}
+	_, err := Exec(env, output, os.Stderr, cmd, args...)
+	return err
+}
+
+// RunWithV is like RunWith, but always sends the command's stdout to os.Stdout.
+func RunWithV(env map[string]string, cmd string, args ...string) error {
+	_, err := Exec(env, os.Stdout, os.Stderr, cmd, args...)
+	return err
+}
+
+// Output runs the command and returns the text from stdout.
+func Output(cmd string, args ...string) (string, error) {
+	buf := &bytes.Buffer{}
+	_, err := Exec(nil, buf, os.Stderr, cmd, args...)
+	return strings.TrimSuffix(buf.String(), "\n"), err
+}
+
+// OutputWith is like RunWith, but returns what is written to stdout.
+func OutputWith(env map[string]string, cmd string, args ...string) (string, error) {
+	buf := &bytes.Buffer{}
+	_, err := Exec(env, buf, os.Stderr, cmd, args...)
+	return strings.TrimSuffix(buf.String(), "\n"), err
+}
+
+// Exec executes the command, piping its stderr to mage's stderr and
+// piping its stdout to the given writer. If the command fails, it will return
+// an error that, if returned from a target or mg.Deps call, will cause mage to
+// exit with the same code as the command failed with.  Env is a list of
+// environment variables to set when running the command, these override the
+// current environment variables set (which are also passed to the command). cmd
+// and args may include references to environment variables in $FOO format, in
+// which case these will be expanded before the command is run.
+//
+// Ran reports if the command ran (rather than was not found or not executable).
+// Code reports the exit code the command returned if it ran. If err == nil, ran
+// is always true and code is always 0.
+func Exec(env map[string]string, stdout, stderr io.Writer, cmd string, args ...string) (ran bool, err error) {
+	expand := func(s string) string {
+		s2, ok := env[s]
+		if ok {
+			return s2
+		}
+		return os.Getenv(s)
+	}
+	cmd = os.Expand(cmd, expand)
+	for i := range args {
+		args[i] = os.Expand(args[i], expand)
+	}
+	ran, code, err := run(env, stdout, stderr, cmd, args...)
+	if err == nil {
+		return true, nil
+	}
+	if ran {
+		return ran, mg.Fatalf(code, `running "%s %s" failed with exit code %d`, cmd, strings.Join(args, " "), code)
+	}
+	return ran, fmt.Errorf(`failed to run "%s %s: %v"`, cmd, strings.Join(args, " "), err)
+}
+
+func run(env map[string]string, stdout, stderr io.Writer, cmd string, args ...string) (ran bool, code int, err error) {
+	c := exec.Command(cmd, args...)
+	c.Env = os.Environ()
+	for k, v := range env {
+		c.Env = append(c.Env, k+"="+v)
+	}
+	c.Stderr = stderr
+	c.Stdout = stdout
+	c.Stdin = os.Stdin
+	log.Println("exec:", cmd, strings.Join(args, " "))
+	err = c.Run()
+	return CmdRan(err), ExitStatus(err), err
+}
+
+// CmdRan examines the error to determine if it was generated as a result of a
+// command running via os/exec.Command.  If the error is nil, or the command ran
+// (even if it exited with a non-zero exit code), CmdRan reports true.  If the
+// error is an unrecognized type, or it is an error from exec.Command that says
+// the command failed to run (usually due to the command not existing or not
+// being executable), it reports false.
+func CmdRan(err error) bool {
+	if err == nil {
+		return true
+	}
+	ee, ok := err.(*exec.ExitError)
+	if ok {
+		return ee.Exited()
+	}
+	return false
+}
+
+type exitStatus interface {
+	ExitStatus() int
+}
+
+// ExitStatus returns the exit status of the error if it is an exec.ExitError
+// or if it implements ExitStatus() int.
+// 0 if it is nil or 1 if it is a different error.
+func ExitStatus(err error) int {
+	if err == nil {
+		return 0
+	}
+	if e, ok := err.(exitStatus); ok {
+		return e.ExitStatus()
+	}
+	if e, ok := err.(*exec.ExitError); ok {
+		if ex, ok := e.Sys().(exitStatus); ok {
+			return ex.ExitStatus()
+		}
+	}
+	return 1
+}
diff --git a/vendor/github.com/magefile/mage/sh/helpers.go b/vendor/github.com/magefile/mage/sh/helpers.go
new file mode 100644
index 00000000..f5d20a27
--- /dev/null
+++ b/vendor/github.com/magefile/mage/sh/helpers.go
@@ -0,0 +1,40 @@
+package sh
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+// Rm removes the given file or directory even if non-empty. It will not return
+// an error if the target doesn't exist, only if the target cannot be removed.
+func Rm(path string) error {
+	err := os.RemoveAll(path)
+	if err == nil || os.IsNotExist(err) {
+		return nil
+	}
+	return fmt.Errorf(`failed to remove %s: %v`, path, err)
+}
+
+// Copy robustly copies the source file to the destination, overwriting the destination if necessary.
+func Copy(dst string, src string) error {
+	from, err := os.Open(src)
+	if err != nil {
+		return fmt.Errorf(`can't copy %s: %v`, src, err)
+	}
+	defer from.Close()
+	finfo, err := from.Stat()
+	if err != nil {
+		return fmt.Errorf(`can't stat %s: %v`, src, err)
+	}
+	to, err := os.OpenFile(dst, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, finfo.Mode())
+	if err != nil {
+		return fmt.Errorf(`can't copy to %s: %v`, dst, err)
+	}
+	defer to.Close()
+	_, err = io.Copy(to, from)
+	if err != nil {
+		return fmt.Errorf(`error copying %s to %s: %v`, src, dst, err)
+	}
+	return nil
+}