After testing it was found that once an session is terminated via an
instance restart, console termination, or SSM agent restart. Any active
session will essentially be terminated and unusable. So knowing that it
is always best to start a new session and let the old one timeout get
terminated.
This change checks for closed iochans related to the log polling
function and will break out of the loop when both channels are closed.
Which is an indicator that the SSM session has been terminated by some
external process. This fixes an issue where Packer hangs, due to the
infinite loop, when an SSM session is killed outside of Packer.
Related to #9442
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
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"
}
]}
```
Megan Marsh
Aleksandr Serbin
Adrien Delorme
Wilken Rivera
sylviamoss
Evan Pipho
Matt Rogers
Adrien Delorme