AMI can not be created from snapshot_id

[CarltonHenderson]

Hi there,

Terraform Version

Terraform v0.8.5
Terraform v0.7.5
(the only two versions I tested)

Affected Resource(s)

Please list the resources as a list, for example:

• aws_ami

Terraform Configuration Files

  resource "aws_ami" "{{ instance_name }}" {
    name = "{{ instance_name }}"
    virtualization_type = "hvm"
    root_device_name = "/dev/sda1"
    ebs_block_device {
      device_name = "/dev/sda1"
      snapshot_id = "{{ snapshot_id }}"
    }
  }

Debug Output

...
2017/02/03 03:22:37 [DEBUG] plugin: terraform: ---[ REQUEST POST-SIGN ]-----------------------------
2017/02/03 03:22:37 [DEBUG] plugin: terraform: POST / HTTP/1.1
2017/02/03 03:22:37 [DEBUG] plugin: terraform: Host: ec2.us-east-1.amazonaws.com
2017/02/03 03:22:37 [DEBUG] plugin: terraform: User-Agent: APN/1.0 HashiCorp/1.0 Terraform/0.8.5
2017/02/03 03:22:37 [DEBUG] plugin: terraform: Content-Length: 435
[redacted]
2017/02/03 03:22:37 [DEBUG] plugin: terraform: Content-Type: application/x-www-form-urlencoded; charset=utf-8
2017/02/03 03:22:37 [DEBUG] plugin: terraform: X-Amz-Date: 20170203T082237Z
2017/02/03 03:22:37 [DEBUG] plugin: terraform: Accept-Encoding: gzip
2017/02/03 03:22:37 [DEBUG] plugin: terraform: 
2017/02/03 03:22:37 [DEBUG] plugin: terraform: Action=RegisterImage&Architecture=x86_64&BlockDeviceMapping.1.DeviceName=%2Fdev%2Fsda1&BlockDeviceMapping.1.Ebs.DeleteOnTermination=true&BlockDeviceMapping.1.Ebs.SnapshotId=snap-[redacted]&BlockDeviceMapping.1.Ebs.VolumeSize=0&BlockDeviceMapping.1.Ebs.VolumeType=standard&Description=&ImageLocation=&Name=aws-management-bl-RESTORATION&RootDeviceName=%2Fdev%2Fsda1&SriovNetSupport=simple&Version=2016-11-15&VirtualizationType=hvm
2017/02/03 03:22:37 [DEBUG] plugin: terraform: -----------------------------------------------------
...
Error applying plan:

1 error(s) occurred:

2017/02/03 03:22:37 [DEBUG] plugin: waiting for all plugin processes to complete...
* aws_ami.aws-management-bl-RESTORATION: InvalidParameterValue: Value (0) for parameter volumeSize is invalid. The volume size is smaller than the snapshot size (20)
	status code: 400, request id: 30b9c2ea-394c-45cf-b61d-3df90cb2a11f

Expected Behavior

Terraform should make the AMI 20 GB like the snapshot I'm trying to make the AMI from. As stated in the manual: If snapshot_id is set and volume_size is omitted then the volume will have the same size as the selected snapshot.

Actual Behavior

Terraform tries to make a 0GB AMI and amazon complains.

Steps to Reproduce

1. terraform plan -out plan && terraform apply plan

Workaround

Specify volume_size = 20 #GB or whatever size fits your snapshot.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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