* master: (511 commits)
Update CHANGELOG.md
core: avoid diff mismatch on NewRemoved fields during -/+
Update CHANGELOG.md
update CHANGELOG
Fix minor error in index/count docs
terraform: remove debug
terraform: when pruning destroy, only match exact nodes, or exact counts
up version for dev
update CHANGELOG
terraform: prune tainted destroys if no tainted in state [GH-1475]
update CHANGELOG
config/lang: support math on variables through implicits
update CHANGELOG
update cHANGELOG
update cHANGELOG
providers/aws: set id outside if/esle
providers/aws: set ID after creation
core: remove dead code from pre-deposed refactor
website: update LC docs to note name is optional
security_groups field expects a list of Security Group Group Names, not IDs
...
Fixes#1409
Resource set hash calculation is a bit of a devil's bargain when it
comes to optional, computed attributes.
If you omit the optional, computed attribute from the hash function,
changing it in an existing config is not properly detected.
If you include the optional, computed attribute in the hash and do not
specify a value for it in the config, then you'll end up with a
perpetual, unresolvable diff.
We'll need to think about how to get the best of both worlds, here, but
for now I'm switching us to the latter and documenting the fact that
changing these attributes requires manual `terraform taint` to apply.
I was working on building a validation to check the user-provided
"device_name" for "root_block_device" on AWS Instances, when I realized
that if I can check it, I might as well just derive it automatically!
So that's what we do here - when you customize the details of the root
block device, device name is just comes from the selected AMI.
Instance block devices are now managed by three distinct sub-resources:
* `root_block_device` - introduced previously
* `ebs_block_device` - all additional ebs-backed volumes
* `ephemeral_block_device` - instance store / ephemeral devices
The AWS API support around BlockDeviceMapping is pretty confusing. It's
a single collection type that supports these three members each of which
has different fields and different behavior.
My biggest hiccup came from the fact that Instance Store volumes do not
show up in any response BlockDeviceMapping for any EC2 `Describe*` API
calls. They're only available from the instance meta-data service as
queried from inside the node.
This removes `block_device` altogether for a clean break from old
configs. New configs will need to sort their `block_device`
declarations into the three new types. The field has been marked
`Removed` to indicate this to users.
With the new block device format being introduced, we need to ensure
Terraform is able to properly read statefiles written in the old format.
So we use the new `helper/schema` facility of "state migrations" to
transform statefiles in the old format to something that the current
version of the schema can use.
Fixes#858
Christopher Tiwald