fix imports

`find . -type f -name '*.go' -not -path "./vendor/*" -exec goimports -w {} \;`

builder/alicloud/ecs/step_attach_keypair.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"time"
@@ -9,7 +10,6 @@ import (
 	"github.com/denverdino/aliyungo/ecs"
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
-	"time"
 )
 
 type stepAttachKeyPar struct {

builder/alicloud/ecs/step_check_source_image.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/common"

builder/alicloud/ecs/step_config_eip.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/common"

builder/alicloud/ecs/step_config_key_pair.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 	"io/ioutil"
 	"os"

builder/alicloud/ecs/step_config_public_ip.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/ecs"

builder/alicloud/ecs/step_config_security_group.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"time"

builder/alicloud/ecs/step_config_vpc.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"time"

builder/alicloud/ecs/step_config_vswitch.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"time"

builder/alicloud/ecs/step_create_image.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/common"

builder/alicloud/ecs/step_create_instance.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 	"io/ioutil"
 	"log"

builder/alicloud/ecs/step_delete_images_snapshots.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 	"log"
 

builder/alicloud/ecs/step_mount_disk.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/ecs"

builder/alicloud/ecs/step_pre_validate.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/common"

builder/alicloud/ecs/step_region_copy_image.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/common"

builder/alicloud/ecs/step_run_instance.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/ecs"

builder/alicloud/ecs/step_share_image.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/common"

builder/alicloud/ecs/step_stop_instance.go

@@ -1,6 +1,7 @@
 package ecs
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/denverdino/aliyungo/ecs"

builder/amazon/chroot/step_attach_volume.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"strings"

builder/amazon/chroot/step_check_root_device.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/service/ec2"

builder/amazon/chroot/step_chroot_provision.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"log"
 
 	"github.com/hashicorp/packer/helper/multistep"

builder/amazon/chroot/step_copy_files.go

@@ -2,14 +2,13 @@ package chroot
 
 import (
 	"bytes"
+	"context"
 	"fmt"
-	"github.com/hashicorp/packer/helper/multistep"
-	"github.com/hashicorp/packer/packer"
 	"log"
 	"path/filepath"
 
+	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
-	"github.com/mitchellh/multistep"
 )
 
 // StepCopyFiles copies some files from the host into the chroot environment.

builder/amazon/chroot/step_create_volume.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
 	"log"
 

builder/amazon/chroot/step_early_cleanup.go

@@ -1,10 +1,12 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
+	"log"
+
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
-	"log"
 )
 
 // StepEarlyCleanup performs some of the cleanup steps early in order to

builder/amazon/chroot/step_early_unflock.go

@@ -1,10 +1,12 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
+	"log"
+
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
-	"log"
 )
 
 // StepEarlyUnflock unlocks the flock.

builder/amazon/chroot/step_flock.go

@@ -1,15 +1,14 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
-	"github.com/hashicorp/packer/helper/multistep"
-	"github.com/hashicorp/packer/packer"
 	"log"
 	"os"
 	"path/filepath"
 
+	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
-	"github.com/mitchellh/multistep"
 )
 
 // StepFlock provisions the instance within a chroot.

builder/amazon/chroot/step_instance_info.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
 	"log"
 

builder/amazon/chroot/step_mount_device.go

@@ -2,6 +2,7 @@ package chroot
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"log"
 	"os"

builder/amazon/chroot/step_mount_extra.go

@@ -2,15 +2,14 @@ package chroot
 
 import (
 	"bytes"
+	"context"
 	"fmt"
-	"github.com/hashicorp/packer/helper/multistep"
-	"github.com/hashicorp/packer/packer"
 	"os"
 	"os/exec"
 	"syscall"
 
+	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
-	"github.com/mitchellh/multistep"
 )
 
 // StepMountExtra mounts the attached device.

builder/amazon/chroot/step_post_mount_commands.go

@@ -1,6 +1,8 @@
 package chroot
 
 import (
+	"context"
+
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
 )

builder/amazon/chroot/step_pre_mount_commands.go

@@ -1,6 +1,8 @@
 package chroot
 
 import (
+	"context"
+
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
 )

builder/amazon/chroot/step_prepare_device.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"os"

builder/amazon/chroot/step_register_ami.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/aws"

builder/amazon/chroot/step_snapshot.go

@@ -1,6 +1,7 @@
 package chroot
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"time"

builder/amazon/common/step_ami_region_copy.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 	"sync"
 

builder/amazon/common/step_create_tags.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/aws"

builder/amazon/common/step_deregister_ami.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/aws"

builder/amazon/common/step_encrypted_ami.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 	"log"
 

builder/amazon/common/step_get_password.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"crypto/rsa"
 	"crypto/x509"
 	"encoding/base64"

builder/amazon/common/step_key_pair.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 	"io/ioutil"
 	"os"

builder/amazon/common/step_modify_ami_attributes.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/aws"

builder/amazon/common/step_modify_ebs_instance.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/aws"

builder/amazon/common/step_pre_validate.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/aws/aws-sdk-go/aws"

builder/amazon/common/step_run_spot_instance.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"encoding/base64"
 	"fmt"
 	"io/ioutil"