command: "terraform login" command

command/login.go

@@ -0,0 +1,410 @@
+package command
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"log"
+	"math/rand"
+	"net"
+	"net/http"
+	"path/filepath"
+	"strings"
+
+	"github.com/hashicorp/terraform/httpclient"
+	"github.com/hashicorp/terraform/svchost"
+	"github.com/hashicorp/terraform/svchost/disco"
+	"github.com/hashicorp/terraform/tfdiags"
+
+	uuid "github.com/hashicorp/go-uuid"
+	"github.com/pkg/browser"
+	"golang.org/x/oauth2"
+)
+
+// LoginCommand is a Command implementation that runs an interactive login
+// flow for a remote service host. It then stashes credentials in a tfrc
+// file in the user's home directory.
+type LoginCommand struct {
+	Meta
+}
+
+// Run implements cli.Command.
+func (c *LoginCommand) Run(args []string) int {
+	args, err := c.Meta.process(args, false)
+	if err != nil {
+		return 1
+	}
+
+	cmdFlags := c.Meta.defaultFlagSet("login")
+	var intoFile string
+	cmdFlags.StringVar(&intoFile, "into-file", "", "set the file that the credentials will be appended to")
+	cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
+	if err := cmdFlags.Parse(args); err != nil {
+		return 1
+	}
+
+	args = cmdFlags.Args()
+	if len(args) > 1 {
+		c.Ui.Error(
+			"The login command expects at most one argument: the host to log in to.")
+		cmdFlags.Usage()
+		return 1
+	}
+
+	var diags tfdiags.Diagnostics
+
+	givenHostname := "app.terraform.io"
+	if len(args) != 0 {
+		givenHostname = args[0]
+	}
+
+	hostname, err := svchost.ForComparison(givenHostname)
+	if err != nil {
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Invalid hostname",
+			fmt.Sprintf("The given hostname %q is not valid: %s.", givenHostname, err.Error()),
+		))
+	}
+
+	// From now on, since we've validated the given hostname, we should use
+	// dispHostname in the UI to ensure we're presenting it in the canonical
+	// form, in case that helpers users with debugging when things aren't
+	// working as expected. (Perhaps the normalization is part of the cause.)
+	dispHostname := hostname.ForDisplay()
+
+	host, err := c.Services.Discover(hostname)
+	if err != nil {
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Service discovery failed for"+dispHostname,
+
+			// Contrary to usual Go idiom, the Discover function returns
+			// full sentences with initial capitalization in its error messages,
+			// and they are written with the end-user as the audience. We
+			// only need to add the trailing period to make them consistent
+			// with our usual error reporting standards.
+			err.Error()+".",
+		))
+	}
+
+	clientConfig, err := host.ServiceOAuthClient("login.v1")
+	switch err.(type) {
+	case nil:
+		// Great! No problem, then.
+	case *disco.ErrServiceNotProvided:
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Host does not support Terraform login",
+			fmt.Sprintf("The given hostname %q does not allow creating Terraform authorization tokens.", dispHostname),
+		))
+	case *disco.ErrVersionNotSupported:
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Host does not support Terraform login",
+			fmt.Sprintf("The given hostname %q allows creating Terraform authorization tokens, but requires a newer version of Terraform CLI to do so.", dispHostname),
+		))
+	default:
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Host does not support Terraform login",
+			fmt.Sprintf("The given hostname %q cannot support \"terraform login\": %s.", dispHostname, err),
+		))
+	}
+
+	if diags.HasErrors() {
+		c.showDiagnostics(diags)
+		return 1
+	}
+
+	token, tokenDiags := c.interactiveGetToken(hostname, clientConfig)
+	diags = diags.Append(tokenDiags)
+	if tokenDiags.HasErrors() {
+		c.showDiagnostics(diags)
+		return 1
+	}
+
+	// TODO: Save the token in the CLI config.
+	// Also, if the token has an expiration time associated with it, prompt
+	// the user that they will need to log in again after that time.
+	fmt.Printf("Token is %#v\n", token)
+
+	c.showDiagnostics(diags)
+	if diags.HasErrors() {
+		return 1
+	}
+	return 0
+}
+
+// Help implements cli.Command.
+func (c *LoginCommand) Help() string {
+	defaultFile := c.defaultOutputFile()
+	if defaultFile == "" {
+		// Because this is just for the help message and it's very unlikely
+		// that a user wouldn't have a functioning home directory anyway,
+		// we'll just use a placeholder here. The real command has some
+		// more complex behavior for this case. This result is not correct
+		// on all platforms, but given how unlikely we are to hit this case
+		// that seems okay.
+		defaultFile = "~/.terraform/credentials.tfrc"
+	}
+
+	helpText := fmt.Sprintf(`
+Usage: terraform login [options] [hostname]
+
+  Retrieves an authentication token for the given hostname, if it supports
+  automatic login, and saves it in a credentials file in your home directory.
+
+  If no hostname is provided, the default hostname is app.terraform.io, to
+  log in to Terraform Cloud.
+
+  If not overridden by the -into-file option, the output file is:
+      %s
+
+Options:
+
+  -into-file=....     Override which file the credentials block will be written
+                      to. If this file already exists then it must have valid
+                      HCL syntax and Terraform will update it in-place.
+`, defaultFile)
+	return strings.TrimSpace(helpText)
+}
+
+// Synopsis implements cli.Command.
+func (c *LoginCommand) Synopsis() string {
+	return "Obtain and save credentials for a remote host"
+}
+
+func (c *LoginCommand) defaultOutputFile() string {
+	if c.CLIConfigDir == "" {
+		return "" // no default available
+	}
+	return filepath.Join(c.CLIConfigDir, "credentials.tfrc")
+}
+
+func (c *LoginCommand) interactiveGetToken(hostname svchost.Hostname, clientConfig *disco.OAuthClient) (*oauth2.Token, tfdiags.Diagnostics) {
+	var diags tfdiags.Diagnostics
+
+	// We'll use an entirely pseudo-random UUID for our temporary request
+	// state. The OAuth server must echo this back to us in the callback
+	// request to make it difficult for some other running process to
+	// interfere by sending its own request to our temporary server.
+	reqState, err := uuid.GenerateUUID()
+	if err != nil {
+		// This should be very unlikely, but could potentially occur if e.g.
+		// there's not enough pseudo-random entropy available.
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Can't generate login request state",
+			fmt.Sprintf("Cannot generate random request identifier for login request: %s.", err),
+		))
+		return nil, diags
+	}
+
+	proofKey, proofKeyChallenge, err := c.proofKey()
+	if err != nil {
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Can't generate login request state",
+			fmt.Sprintf("Cannot generate random prrof key for login request: %s.", err),
+		))
+		return nil, diags
+	}
+
+	listener, callbackURL, err := c.listenerForCallback(clientConfig.MinPort, clientConfig.MaxPort)
+	if err != nil {
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Can't start temporary login server",
+			fmt.Sprintf(
+				"The login process uses OAuth, which requires starting a temporary HTTP server on localhost. However, no TCP port numbers between %d and %d are available to create such a server.",
+				clientConfig.MinPort, clientConfig.MaxPort,
+			),
+		))
+		return nil, diags
+	}
+
+	// codeCh will allow our temporary HTTP server to transmit the OAuth code
+	// to the main execution path that follows.
+	codeCh := make(chan string)
+	server := &http.Server{
+		Handler: http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
+			err := req.ParseForm()
+			if err != nil {
+				log.Printf("[ERROR] login: cannot ParseForm on callback request: %s", err)
+				resp.WriteHeader(400)
+				return
+			}
+			gotState := req.Form.Get("state")
+			if gotState != reqState {
+				log.Printf("[ERROR] login: incorrect \"state\" value in callback request")
+				resp.WriteHeader(400)
+				return
+			}
+			gotCode := req.Form.Get("code")
+			if gotCode == "" {
+				log.Printf("[ERROR] login: no \"code\" argument in callback request")
+				resp.WriteHeader(400)
+				return
+			}
+
+			// Send the code to our blocking wait below, so that the token
+			// fetching process can continue.
+			codeCh <- gotCode
+			close(codeCh)
+
+			resp.Header().Add("Content-Type", "text/html")
+			resp.WriteHeader(200)
+			resp.Write([]byte(callbackSuccessMessage))
+		}),
+	}
+	go func() {
+		err = server.Serve(listener)
+		if err != nil && err != http.ErrServerClosed {
+			diags = diags.Append(tfdiags.Sourceless(
+				tfdiags.Error,
+				"Can't start temporary login server",
+				fmt.Sprintf(
+					"The login process uses OAuth, which requires starting a temporary HTTP server on localhost. However, no TCP port numbers between %d and %d are available to create such a server.",
+					clientConfig.MinPort, clientConfig.MaxPort,
+				),
+			))
+			close(codeCh)
+		}
+	}()
+
+	oauthConfig := &oauth2.Config{
+		ClientID:    clientConfig.ID,
+		Endpoint:    clientConfig.Endpoint(),
+		RedirectURL: callbackURL,
+	}
+
+	authCodeURL := oauthConfig.AuthCodeURL(
+		reqState,
+		oauth2.SetAuthURLParam("code_challenge", proofKeyChallenge),
+		oauth2.SetAuthURLParam("code_challenge_method", "S256"),
+	)
+	err = browser.OpenURL(authCodeURL)
+	if err == nil {
+		c.Ui.Output(fmt.Sprintf("Terraform must now open a web browser to the login page for %s.\n", hostname.ForDisplay()))
+		c.Ui.Output(fmt.Sprintf("If a browser does not open this automatically, open the following URL to proceed:\n    %s\n", authCodeURL))
+	} else {
+		// Assume we're on a platform where opening a browser isn't possible.
+		c.Ui.Output(fmt.Sprintf("Open the following URL to access the login page for %s:\n    %s\n", hostname.ForDisplay(), authCodeURL))
+	}
+
+	c.Ui.Output("Terraform will now wait for the host to signal that login was successful.\n")
+
+	code, ok := <-codeCh
+	if !ok {
+		// If we got no code at all then the server wasn't able to start
+		// up, so we'll just give up.
+		return nil, diags
+	}
+
+	err = server.Close()
+	if err != nil {
+		// The server will close soon enough when our process exits anyway,
+		// so we won't fuss about it for right now.
+		log.Printf("[WARN] login: callback server can't shut down: %s", err)
+	}
+
+	ctx := context.WithValue(context.Background(), oauth2.HTTPClient, httpclient.New())
+	token, err := oauthConfig.Exchange(
+		ctx, code,
+		oauth2.SetAuthURLParam("code_verifier", proofKey),
+	)
+	if err != nil {
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Failed to obtain auth token",
+			fmt.Sprintf("The remote server did not assign an auth token: %s.", err),
+		))
+		return nil, diags
+	}
+
+	return token, diags
+}
+
+func (c *LoginCommand) listenerForCallback(minPort, maxPort uint16) (net.Listener, string, error) {
+	if minPort < 1024 || maxPort < 1024 {
+		// This should never happen because it should've been checked by
+		// the svchost/disco package when reading the service description,
+		// but we'll prefer to fail hard rather than inadvertently trying
+		// to open an unprivileged port if there are bugs at that layer.
+		panic("listenerForCallback called with privileged port number")
+	}
+
+	availCount := int(maxPort) - int(minPort)
+
+	// We're going to try port numbers within the range at random, so we need
+	// to terminate eventually in case _none_ of the ports are available.
+	// We'll make that 150% of the number of ports just to give us some room
+	// for the random number generator to generate the same port more than
+	// once.
+	// Note that we don't really care about true randomness here... we're just
+	// trying to hop around in the available port space rather than always
+	// working up from the lowest, because we have no information to predict
+	// that any particular number will be more likely to be available than
+	// another.
+	maxTries := availCount + (availCount / 2)
+
+	for tries := 0; tries < maxTries; tries++ {
+		port := rand.Intn(availCount) + int(minPort)
+		addr := fmt.Sprintf("127.0.0.1:%d", port)
+		log.Printf("[TRACE] login: trying %s as a listen address for temporary OAuth callback server", addr)
+		l, err := net.Listen("tcp4", addr)
+		if err == nil {
+			// We use a path that doesn't end in a slash here because some
+			// OAuth server implementations don't allow callback URLs to
+			// end with slashes.
+			callbackURL := fmt.Sprintf("http://localhost:%d/login", port)
+			log.Printf("[TRACE] login: callback URL will be %s", callbackURL)
+			return l, callbackURL, nil
+		}
+	}
+
+	return nil, "", fmt.Errorf("no suitable TCP ports (between %d and %d) are available for the temporary OAuth callback server", minPort, maxPort)
+}
+
+func (c *LoginCommand) proofKey() (key, challenge string, err error) {
+	// Wel use a UUID-like string as the "proof key for code exchange" (PKCE)
+	// that will eventually authenticate our request to the token endpoint.
+	// Standard UUIDs are explicitly not suitable as secrets according to the
+	// UUID spec, but our go-uuid just generates totally random number sequences
+	// formatted in the conventional UUID syntax, so that concern does not
+	// apply here: this is just a 128-bit crypto-random number.
+	key, err = uuid.GenerateUUID()
+	if err != nil {
+		return "", "", err
+	}
+
+	h := sha256.New()
+	h.Write([]byte(key))
+	challenge = base64.RawURLEncoding.EncodeToString(h.Sum(nil))
+
+	return key, challenge, nil
+}
+
+const callbackSuccessMessage = `
+<html>
+<head>
+<title>Terraform Login</title>
+<style type="text/css">
+body {
+	font-family: monospace;
+	color: #fff;
+	background-color: #000;
+}
+</style>
+</head>
+<body>
+
+<p>The login server has returned an authentication code to Terraform.</p>
+<p>Now close this page and return to the terminal where <tt>terraform login</tt>
+is running to see the result of the login process.</p>
+
+</body>
+</html>
+`

command/meta.go

@@ -61,6 +61,14 @@ type Meta struct {
 	// the specific commands being run.
 	RunningInAutomation bool
 
+	// CLIConfigDir is the directory from which CLI configuration files were
+	// read by the caller and the directory where any changes to CLI
+	// configuration files by commands should be made.
+	//
+	// If this is empty then no configuration directory is available and
+	// commands which require one cannot proceed.
+	CLIConfigDir string
+
 	// PluginCacheDir, if non-empty, enables caching of downloaded plugins
 	// into the given directory.
 	PluginCacheDir string

commands.go

@@ -50,6 +50,11 @@ func initCommands(config *Config, services *disco.Disco) {
 		services.ForceHostServices(host, hostConfig.Services)
 	}
 
+	configDir, err := ConfigDir()
+	if err != nil {
+		configDir = "" // No config dir available (e.g. looking up a home directory failed)
+	}
+
 	dataDir := os.Getenv("TF_DATA_DIR")
 
 	meta := command.Meta{
@@ -61,6 +66,7 @@ func initCommands(config *Config, services *disco.Disco) {
 		Services: services,
 
 		RunningInAutomation: inAutomation,
+		CLIConfigDir:        configDir,
 		PluginCacheDir:      config.PluginCacheDir,
 		OverrideDataDir:     dataDir,
 
@@ -172,6 +178,12 @@ func initCommands(config *Config, services *disco.Disco) {
 			}, nil
 		},
 
+		"login": func() (cli.Command, error) {
+			return &command.LoginCommand{
+				Meta: meta,
+			}, nil
+		},
+
 		"output": func() (cli.Command, error) {
 			return &command.OutputCommand{
 				Meta: meta,

go.mod

@@ -103,6 +103,7 @@ require (
 	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/packer-community/winrmcp v0.0.0-20180102160824-81144009af58
 	github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c // indirect
+	github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
 	github.com/pkg/errors v0.8.0
 	github.com/posener/complete v1.2.1
 	github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 // indirect

go.sum

@@ -1,4 +1,3 @@
-cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
@@ -22,7 +21,6 @@ github.com/Unknwon/com v0.0.0-20151008135407-28b053d5a292 h1:tuQ7w+my8a8mkwN7x2T
 github.com/Unknwon/com v0.0.0-20151008135407-28b053d5a292/go.mod h1:KYCjqMOeHpNuTOiFQU6WEcTG7poCJrUs0YgyHNtn1no=
 github.com/abdullin/seq v0.0.0-20160510034733-d5467c17e7af h1:DBNMBMuMiWYu0b+8KMJuWmfCkcxl09JwdlqwDZZ6U14=
 github.com/abdullin/seq v0.0.0-20160510034733-d5467c17e7af/go.mod h1:5Jv4cbFiHJMsVxt52+i0Ha45fjshj6wxYr1r19tB9bw=
-github.com/agext/levenshtein v1.2.1 h1:QmvMAjj2aEICytGiWzmxoE0x2KZvE0fvmqMOfy2tjT8=
 github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
 github.com/agext/levenshtein v1.2.2 h1:0S/Yg6LYmFJ5stwQeRp6EeOcCbj7xiqQSdNelsXvaqE=
 github.com/agext/levenshtein v1.2.2/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
@@ -42,7 +40,6 @@ github.com/antchfx/xquery v0.0.0-20180515051857-ad5b8c7a47b0 h1:JaCC8jz0zdMLk2m+
 github.com/antchfx/xquery v0.0.0-20180515051857-ad5b8c7a47b0/go.mod h1:LzD22aAzDP8/dyiCKFp31He4m2GPjl0AFyzDtZzUu9M=
 github.com/apparentlymart/go-cidr v1.0.0 h1:lGDvXx8Lv9QHjrAVP7jyzleG4F9+FkRhJcEsDFxeb8w=
 github.com/apparentlymart/go-cidr v1.0.0/go.mod h1:EBcsNrHc3zQeuaeCeCtQruQm+n9/YjEn/vI25Lg7Gwc=
-github.com/apparentlymart/go-dump v0.0.0-20180507223929-23540a00eaa3 h1:ZSTrOEhiM5J5RFxEaFvMZVEAM1KvT1YzbEOwB2EAGjA=
 github.com/apparentlymart/go-dump v0.0.0-20180507223929-23540a00eaa3/go.mod h1:oL81AME2rN47vu18xqj1S1jPIPuN7afo62yKTNn3XMM=
 github.com/apparentlymart/go-dump v0.0.0-20190214190832-042adf3cf4a0 h1:MzVXffFUye+ZcSR6opIgz9Co7WcDx6ZcY+RjfFHoA0I=
 github.com/apparentlymart/go-dump v0.0.0-20190214190832-042adf3cf4a0/go.mod h1:oL81AME2rN47vu18xqj1S1jPIPuN7afo62yKTNn3XMM=
@@ -56,7 +53,6 @@ github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj
 github.com/armon/go-radix v1.0.0 h1:F4z6KzEeeQIMeLFa97iZU6vupzoecKdU5TX24SNppXI=
 github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/aws/aws-sdk-go v1.15.78/go.mod h1:E3/ieXAlvM0XWO57iftYVDLLvQ824smPP3ATZkfNZeM=
-github.com/aws/aws-sdk-go v1.16.36 h1:POeH34ZME++pr7GBGh+ZO6Y5kOwSMQpqp5BGUgooJ6k=
 github.com/aws/aws-sdk-go v1.16.36/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.22.0 h1:e88V6+dSEyBibUy0ekOydtTfNWzqG3hrtCR8SF6UqqY=
 github.com/aws/aws-sdk-go v1.22.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
@@ -124,23 +120,19 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
 github.com/golang/groupcache v0.0.0-20180513044358-24b0969c4cb7 h1:u4bArs140e9+AfE52mFHOXVFnOSBJBRlzTHrOPLOIhE=
 github.com/golang/groupcache v0.0.0-20180513044358-24b0969c4cb7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/mock v1.2.0 h1:28o5sBqPkBsMGnC6b4MvE2TzSr5/AT4c/1fLqVGIwlk=
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.3.1 h1:qGJ6qTW+x6xX/my+8YUVl4WNpX9B7+/l2tRsHGZ7f2s=
 github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
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-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
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 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
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-github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
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@@ -208,13 +200,11 @@ github.com/hashicorp/go-sockaddr v0.0.0-20180320115054-6d291a969b86 h1:7YOlAIO2Y
 github.com/hashicorp/go-sockaddr v0.0.0-20180320115054-6d291a969b86/go.mod h1:7Xibr9yA9JjQq1JpNB2Vw7kxv8xerXegt+ozgdvDeDU=
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-github.com/hashicorp/go-uuid v1.0.0 h1:RS8zrF7PhGwyNPOtxSClXXj9HA8feRnJzgnI1RJCSnM=
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-github.com/hashicorp/golang-lru v0.5.0 h1:CL2msUPvZTLb5O648aiLNJw3hnBxN2+1Jq8rCOH9wdo=
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 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
@@ -251,7 +241,6 @@ github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1
 github.com/jtolds/gls v4.2.1+incompatible h1:fSuqC+Gmlu6l/ZYAoZzx2pyucC8Xza35fpRVWLVmUEE=
 github.com/jtolds/gls v4.2.1+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
-github.com/kardianos/osext v0.0.0-20170510131534-ae77be60afb1 h1:PJPDf8OUfOK1bb/NeTKd4f1QXZItOX389VN3B6qC8ro=
 github.com/kardianos/osext v0.0.0-20170510131534-ae77be60afb1/go.mod h1:1NbS8ALrpOvjt0rHPNLyCIeMtbizbir8U//inJ+zuB8=
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@@ -265,7 +254,6 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
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 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348 h1:MtvEpTB6LX3vkb4ax0b5D2DHbNAUsen0Gx5wZoq3lV4=
 github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348/go.mod h1:B69LEHPfb2qLo0BaaOLcbitczOKLWTsrBG9LczfCD4k=
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@@ -279,12 +267,10 @@ github.com/masterzen/simplexml v0.0.0-20160608183007-4572e39b1ab9 h1:SmVbOZFWAly
 github.com/masterzen/simplexml v0.0.0-20160608183007-4572e39b1ab9/go.mod h1:kCEbxUJlNDEBNbdQMkPSp6yaKcRXVI6f4ddk8Riv4bc=
 github.com/masterzen/winrm v0.0.0-20190223112901-5e5c9a7fe54b h1:/1RFh2SLCJ+tEnT73+Fh5R2AO89sQqs8ba7o+hx1G0Y=
 github.com/masterzen/winrm v0.0.0-20190223112901-5e5c9a7fe54b/go.mod h1:wr1VqkwW0AB5JS0QLy5GpVMS9E3VtRoSYXUYyVk46KY=
-github.com/mattn/go-colorable v0.0.9 h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
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 github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
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-github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
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 github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
@@ -301,13 +287,11 @@ github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2Em
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
 github.com/mitchellh/copystructure v1.0.0 h1:Laisrj+bAB6b/yJwB5Bt3ITZhGJdqmxquMKeZ+mmkFQ=
 github.com/mitchellh/copystructure v1.0.0/go.mod h1:SNtv71yrdKgLRyLFxmLdkAbkKEFWgYaq1OVrnRcwhnw=
-github.com/mitchellh/go-homedir v1.0.0 h1:vKb8ShqSby24Yrqr/yDYkuFz8d0WUjys40rvnGC8aR0=
 github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
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 github.com/mitchellh/go-linereader v0.0.0-20190213213312-1b945b3263eb/go.mod h1:OaY7UOoTkkrX3wRwjpYRKafIkkyeD0UtweSHAWWiqQM=
-github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77 h1:7GoSOOW2jpsfkntVKaS2rAr1TJqfcxotyaUcuxoZSzg=
 github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77/go.mod h1:kRemZodwjscx+RGhAo8eIhFbs2+BFgRtFPeD/KE+zxI=
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@@ -340,18 +324,18 @@ github.com/packer-community/winrmcp v0.0.0-20180102160824-81144009af58 h1:m3CEgv
 github.com/packer-community/winrmcp v0.0.0-20180102160824-81144009af58/go.mod h1:f6Izs6JvFTdnRbziASagjZ2vmf55NSIkC/weStxCHqk=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c h1:Lgl0gzECD8GnQ5QCWA8o6BtfL6mDH5rQgM4/fX3avOs=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
+github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4 h1:49lOXmGaUpV9Fz3gd7TFZY106KVlPVa5jcYD1gaQf98=
+github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4/go.mod h1:4OwLy04Bl9Ef3GJJCoec+30X3LQs/0/m4HFRt/2LUSA=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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-github.com/posener/complete v1.1.1 h1:ccV59UEOTzVDnDUEFdT95ZzHVZ+5+158q8+SJb2QV5w=
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 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 h1:D+CiwcpGTW6pL6bv6KI3KbyEyCKyS+1JWS2h8PNDnGA=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod h1:p2iRAGwDERtqlqzRXnrOVns+ignqQo//hLXqYxZYVNs=
-github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 h1:idejC8f05m9MGOsuEi1ATq9shN03HrxNkD/luQvxCv8=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
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@@ -377,9 +361,7 @@ github.com/soheilhy/cmux v0.1.4 h1:0HKaf1o97UwFjHH9o5XsHUOF+tqmdA7KEzXLpiyaw0E=
 github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
 github.com/spf13/afero v1.2.1 h1:qgMbHoJbPbw579P+1zVY+6n4nIFuIchaIjzZ/I/Yq8M=
 github.com/spf13/afero v1.2.1/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
-github.com/spf13/pflag v1.0.2 h1:Fy0orTDgHdbnzHcsOgfCN4LtHf0ec3wwtiwJqwvf3Gc=
 github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
-github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
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 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -405,7 +387,6 @@ github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18 h1:MPPkRncZLN9Kh4M
 github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557 h1:Jpn2j6wHkC9wJv5iMfJhKqrZJx3TahFx+7sbZ7zQdxs=
 github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557/go.mod h1:ce1O1j6UtZfjr22oyGxGLbauSBp2YVXpARAosm7dHBg=
-github.com/zclconf/go-cty v1.0.0 h1:EWtv3gKe2wPLIB9hQRQJa7k/059oIfAqcEkCNnaVckk=
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@@ -422,13 +403,9 @@ go.uber.org/zap v1.9.1 h1:XCJQEf3W6eZaVwhRBof6ImoYGJSITeKWsyeh3HFu/5o=
 go.uber.org/zap v1.9.1/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181112202954-3d3f9f413869/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2 h1:NwxKRvbkH5MsNkvOtPZi3/3kmI8CAzs3mtv+GLQMkNo=
 golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/crypto v0.0.0-20190222235706-ffb98f73852f h1:qWFY9ZxP3tfI37wYIs/MnIAqK0vlXp1xnYEa5HxFSSY=
 golang.org/x/crypto v0.0.0-20190222235706-ffb98f73852f/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734 h1:p/H982KKEjUnLJkM3tt/LemDnOc1GiZL5FCVlORJ5zo=
 golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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@@ -450,28 +427,23 @@ golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190213061140-3a22650c66bd h1:HuTn7WObtcDo9uEEU7rEqL0jYthdXAmZ6PP+meazmaU=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190502183928-7f726cade0ab h1:9RfW3ktsOZxgo9YNbBAjq1FWzc/igwEcUzZz8IXgSbk=
 golang.org/x/net v0.0.0-20190502183928-7f726cade0ab/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
-golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421 h1:Wo7BWFiOk0QRFMLYMqJGFMd9CgUAcGx7V+qEg/h5IBI=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 h1:SVwTIAaPC2U/AvvLNZ2a7OVsmBpC8L5BlwK1whH3hm0=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -479,30 +451,23 @@ golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190129075346-302c3dd5f1cc h1:WiYx1rIFmx8c0mXAFtv5D/mHyKe1+jmuP7PViuwqwuQ=
 golang.org/x/sys v0.0.0-20190129075346-302c3dd5f1cc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190221075227-b4e8571b14e0 h1:bzeyCHgoAyjZjAhvTpks+qM7sdlh4cCSitmXeCEO3B4=
 golang.org/x/sys v0.0.0-20190221075227-b4e8571b14e0/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223 h1:DH4skfRX4EBpamg7iV4ZlCpblAHI6s6TDM39bFZumv8=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82 h1:vsphBvatvfbhlb4PO1BYSr9dzugGxJ/SQHoNufZJq1w=
 golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa h1:KIDDMLT1O0Nr7TSxp8xM5tJcdn8tgyAONntO829og1M=
 golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2 h1:z99zHgr7hKfrUcX/KsoJk5FJfjTceCKIp96+biqP4To=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/time v0.0.0-20181108054448-85acf8d2951c h1:fqgJT0MGcGpPgpWU7VRdRjuArfcOvC4AoJmILihzhDg=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -522,13 +487,11 @@ google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEn
 google.golang.org/api v0.9.0 h1:jbyannxz0XFD3zdjgrSUsaJbgpH4eTrkdhRChkHPfO8=
 google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.6.1 h1:QzqyMA1tlu6CgqCDUtU9V+ZKhLFT2dkJuANu5QaxI3I=
 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19 h1:Lj2SnHtxkRGJDqnGaSjo+CCdIieEnwVazbOXILwQemk=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
@@ -536,7 +499,6 @@ google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/grpc v1.14.0 h1:ArxJuB1NWfPY6r9Gp9gqwplT0Ge7nqv9msgu03lHLmo=
 google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=

vendor/github.com/pkg/browser/LICENSE

@@ -0,0 +1,23 @@
+Copyright (c) 2014, Dave Cheney <dave@cheney.net>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/pkg/browser/README.md

@@ -0,0 +1,55 @@
+
+# browser
+    import "github.com/pkg/browser"
+
+Package browser provides helpers to open files, readers, and urls in a browser window.
+
+The choice of which browser is started is entirely client dependant.
+
+
+
+
+
+## Variables
+``` go
+var Stderr io.Writer = os.Stderr
+```
+Stderr is the io.Writer to which executed commands write standard error.
+
+``` go
+var Stdout io.Writer = os.Stdout
+```
+Stdout is the io.Writer to which executed commands write standard output.
+
+
+## func OpenFile
+``` go
+func OpenFile(path string) error
+```
+OpenFile opens new browser window for the file path.
+
+
+## func OpenReader
+``` go
+func OpenReader(r io.Reader) error
+```
+OpenReader consumes the contents of r and presents the
+results in a new browser window.
+
+
+## func OpenURL
+``` go
+func OpenURL(url string) error
+```
+OpenURL opens a new browser window pointing to url.
+
+
+
+
+
+
+
+
+
+- - -
+Generated by [godoc2md](http://godoc.org/github.com/davecheney/godoc2md)

vendor/github.com/pkg/browser/browser.go

@@ -0,0 +1,63 @@
+// Package browser provides helpers to open files, readers, and urls in a browser window.
+//
+// The choice of which browser is started is entirely client dependant.
+package browser
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+// Stdout is the io.Writer to which executed commands write standard output.
+var Stdout io.Writer = os.Stdout
+
+// Stderr is the io.Writer to which executed commands write standard error.
+var Stderr io.Writer = os.Stderr
+
+// OpenFile opens new browser window for the file path.
+func OpenFile(path string) error {
+	path, err := filepath.Abs(path)
+	if err != nil {
+		return err
+	}
+	return OpenURL("file://" + path)
+}
+
+// OpenReader consumes the contents of r and presents the
+// results in a new browser window.
+func OpenReader(r io.Reader) error {
+	f, err := ioutil.TempFile("", "browser")
+	if err != nil {
+		return fmt.Errorf("browser: could not create temporary file: %v", err)
+	}
+	if _, err := io.Copy(f, r); err != nil {
+		f.Close()
+		return fmt.Errorf("browser: caching temporary file failed: %v", err)
+	}
+	if err := f.Close(); err != nil {
+		return fmt.Errorf("browser: caching temporary file failed: %v", err)
+	}
+	oldname := f.Name()
+	newname := oldname + ".html"
+	if err := os.Rename(oldname, newname); err != nil {
+		return fmt.Errorf("browser: renaming temporary file failed: %v", err)
+	}
+	return OpenFile(newname)
+}
+
+// OpenURL opens a new browser window pointing to url.
+func OpenURL(url string) error {
+	return openBrowser(url)
+}
+
+func runCmd(prog string, args ...string) error {
+	cmd := exec.Command(prog, args...)
+	cmd.Stdout = Stdout
+	cmd.Stderr = Stderr
+	setFlags(cmd)
+	return cmd.Run()
+}

vendor/github.com/pkg/browser/browser_darwin.go

@@ -0,0 +1,9 @@
+package browser
+
+import "os/exec"
+
+func openBrowser(url string) error {
+	return runCmd("open", url)
+}
+
+func setFlags(cmd *exec.Cmd) {}

vendor/github.com/pkg/browser/browser_linux.go

@@ -0,0 +1,9 @@
+package browser
+
+import "os/exec"
+
+func openBrowser(url string) error {
+	return runCmd("xdg-open", url)
+}
+
+func setFlags(cmd *exec.Cmd) {}

vendor/github.com/pkg/browser/browser_openbsd.go

@@ -0,0 +1,16 @@
+package browser
+
+import (
+	"errors"
+	"os/exec"
+)
+
+func openBrowser(url string) error {
+	err := runCmd("xdg-open", url)
+	if e, ok := err.(*exec.Error); ok && e.Err == exec.ErrNotFound {
+		return errors.New("xdg-open: command not found - install xdg-utils from ports(8)")
+	}
+	return err
+}
+
+func setFlags(cmd *exec.Cmd) {}

vendor/github.com/pkg/browser/browser_unsupported.go

@@ -0,0 +1,15 @@
+// +build !linux,!windows,!darwin,!openbsd
+
+package browser
+
+import (
+	"fmt"
+	"os/exec"
+	"runtime"
+)
+
+func openBrowser(url string) error {
+	return fmt.Errorf("openBrowser: unsupported operating system: %v", runtime.GOOS)
+}
+
+func setFlags(cmd *exec.Cmd) {}

vendor/github.com/pkg/browser/browser_windows.go

@@ -0,0 +1,16 @@
+package browser
+
+import (
+	"os/exec"
+	"strings"
+	"syscall"
+)
+
+func openBrowser(url string) error {
+	r := strings.NewReplacer("&", "^&")
+	return runCmd("cmd", "/c", "start", r.Replace(url))
+}
+
+func setFlags(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
+}

vendor/modules.txt

@@ -437,6 +437,8 @@ github.com/nu7hatch/gouuid
 github.com/oklog/run
 # github.com/packer-community/winrmcp v0.0.0-20180102160824-81144009af58
 github.com/packer-community/winrmcp/winrmcp
+# github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4
+github.com/pkg/browser
 # github.com/pkg/errors v0.8.0
 github.com/pkg/errors
 # github.com/posener/complete v1.2.1