gofmt and nicer errors

cmd/connect.go

@@ -2,7 +2,10 @@ package cmd
 
 import (
 	"context"
+	"fmt"
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/awserr"
+	"github.com/aws/aws-sdk-go/aws/credentials"
 	"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/ec2"
@@ -15,6 +18,7 @@ import (
 	"io/ioutil"
 	"net"
 	"os"
+	"strings"
 )
 
 func init() {
@@ -29,7 +33,27 @@ func init() {
 
 			info, err := authorize(instanceId, region, user, sshKeyPath)
 			if err != nil {
-				panic(err)
+				if awsErr, ok := errors.Cause(err).(awserr.Error); ok {
+					if awsErr.Code() == credentials.ErrNoValidProvidersFoundInChain.Code() {
+						fmt.Fprintln(os.Stderr, `
+No AWS credentials found.
+
+* You can specify one of the profiles from ~/.aws/config by setting the 
+  AWS_PROFILE environment variable.
+
+* You can set AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY and optionally
+  AWS_SESSION_TOKEN.`)
+					} else if strings.HasPrefix(awsErr.Code(), "InvalidInstanceID.") {
+						fmt.Fprintf(os.Stderr, `
+No instance found with ID %s. Try specifying an explicit region using the 
+AWS_REGION environment variable.
+
+`, instanceId)
+					}
+					return
+				} else {
+					panic(err)
+				}
 			}
 
 			err = connect(info.Address + ":22")
@@ -38,7 +62,7 @@ func init() {
 			}
 		},
 	}
-	
+
 	cmd.PersistentFlags().String("instance-id", "", "")
 	cmd.PersistentFlags().String("region", "", "")
 	cmd.PersistentFlags().String("user", "ec2-user", "")
@@ -59,9 +83,9 @@ func authorize(instanceId, region, user, sshKeyPath string) (*ec2connect.Connect
 	}
 
 	sess, err := session.NewSessionWithOptions(session.Options{
-		SharedConfigState: session.SharedConfigEnable,
+		SharedConfigState:       session.SharedConfigEnable,
 		AssumeRoleTokenProvider: stscreds.StdinTokenProvider,
-		Config: *aws.NewConfig().WithRegion(region),//.WithLogLevel(aws.LogDebugWithHTTPBody),
+		Config:                  *aws.NewConfig().WithRegion(region), //.WithLogLevel(aws.LogDebugWithHTTPBody),
 	})
 	if err != nil {
 		return nil, err

cmd/install.go

@@ -8,7 +8,7 @@ func init() {
 	cmd := &cobra.Command{
 		Use:   "install",
 		Short: "Remotely install EC2 Instance Connect on EC2 instance",
-		Long: ``,
+		Long:  ``,
 		Run: func(cmd *cobra.Command, args []string) {
 		},
 	}
@@ -18,4 +18,4 @@ func init() {
 
 func install() error {
 	return nil
-}
+}

cmd/root.go

@@ -25,7 +25,7 @@ import (
 var RootCmd = &cobra.Command{
 	Use:   "ec2connect",
 	Short: "",
-	Long: ``,
+	Long:  ``,
 	// Uncomment the following line if your bare application
 	// has an action associated with it:
 	//	Run: func(cmd *cobra.Command, args []string) { },
@@ -47,9 +47,9 @@ func init() {
 
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
-	viper.AddConfigPath(".")        // adding home directory as first search path
-	viper.AddConfigPath("$HOME")    // adding home directory as first search path
-	viper.AutomaticEnv()            // read in environment variables that match
+	viper.AddConfigPath(".")     // adding home directory as first search path
+	viper.AddConfigPath("$HOME") // adding home directory as first search path
+	viper.AutomaticEnv()         // read in environment variables that match
 
 	// If a config file is found, read it in.
 	if err := viper.ReadInConfig(); err == nil {

cmd/setup.go

@@ -85,4 +85,4 @@ Match exec "ec2connect match --host %n --user %r"
 Include %s
 `, myConfPath))
 	return err
-}
+}

cmd/version.go

@@ -23,4 +23,3 @@ Date: %s
 
 	RootCmd.AddCommand(cmd)
 }
-

pkg/ec2connect/authorize.go

@@ -53,7 +53,7 @@ func (c *Authorizer) Authorize(ctx context.Context, instanceId, user, sshKey str
 	}
 
 	return &ConnectionInfo{
-		Address: ip,
+		Address:   ip,
 		RequestId: *r2.RequestId,
 	}, nil
 }
@@ -65,4 +65,4 @@ func NormalizeKey(input string) (string, error) {
 	}
 
 	return string(ssh.MarshalAuthorizedKey(s.PublicKey())), nil
-}
+}