withouth this fix we would have had to do
```hcl
temporary_iam_instance_profile_policy_document {
statement {
action = ["*"]
effect = "Allow"
resource = ["*"]
}
version = "2012-10-17"
}
```
instead of the same document but with capitalised fields
hcl2_upgrade transforms a JSON build-file in a HCL2 build-file.
This starts a validated Packer core and from that core we generate an HCL 'block' per plugin/configuration. So for a builder, a provisioner, a post-processor or a variable. The contents of each block is just transformed as is and basically all fields are HCL2-ified.
A generated field can be valid in JSON but invalid on HCL2; for example JSON templating (in mapstructure) allows to set arrays of strings - like `x = ["a", "b"]` - with single strings - like `x="a"` -, HCL does not allow this.
Since JSON does not make the distinction between variables and locals, everything will be a variable. So variables that use other variables will not work.
hcl2_upgrade tries to transform go templating interpolation calls to HCL2 calls when possible, leaving the go templating calls like they are in case it cannot.
Work:
* transpiler
* tests
* update hcl v2 library so that output looks great.
* update docs
PutRolePolicy & AddRoleToInstanceProfile are eventually consistent but it is not possible to wait for them to be done here: 0785c2f6fc/builder/amazon/common/step_iam_instance_profile.go (L117-L134) which was causing the `CreateFleet` to fail (100% for me). So for now we retry a bit later. Waiting 5 seconds after the previously linked code also fixed this.
Test file:
```json
{
"builders": [
{
"type": "amazon-ebs",
"region": "eu-west-1",
"ami_name": "ubuntu-16.04 test {{timestamp}}",
"ami_description": "Ubuntu 16.04 LTS - expand root partition",
"source_ami_filter": {
"filters": {
"virtualization-type": "hvm",
"name": "ubuntu/images/*/ubuntu-xenial-16.04-amd64-server-*",
"root-device-type": "ebs"
},
"owners": [
"099720109477"
],
"most_recent": true
},
"spot_price": "0.03",
"spot_instance_types": [
"t2.small"
],
"encrypt_boot": true,
"ssh_username": "ubuntu",
"ssh_interface": "session_manager",
"temporary_iam_instance_profile_policy_document": {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"*"
],
"Resource": "*"
}
]
},
"communicator": "ssh"
}
]}
```
Larry
Adrien Delorme
Megan Marsh
Wilken Rivera
raygervais
Sylvia Moss
Marin Salinas
PacoDw