Add Timestamp Variable

[grubernaut]

Adds a timestamp variable, as "${timestamp}", similar to Packer.

Can be useful for naming and other things

[grubernaut]

This fixes #494, but as stated in that issue, should probably wait until #2018 is implemented.

Needs tests and documentation as well

[phinze]

This is a great start, @grubernaut!

However, I think this should be implemented as an interpolation function instead of a variable. The variable route made sense in Packer, since Packer does not have functions like we do.

This also gives us the opportunity to add an optional strftime-style format argument if we'd like.

[grubernaut]

Yeah an interpolation function would be a lot cleaner and smoother than this one :)
There is this commit, which I don't believe was ever submitted as a PR that should probably be used instead of this commit: rcostanzo@e6e6e46

[dattatrayakumbhar]

Is this available in 0.7.4.
I used below resource with timestamp as name
1.
resource "openstack_compute_instance_v2" "bastion" {
name = "${timestamp()}"

however I got error
Errors:

• 1:3: unknown function called: timestamp in:

${timestamp()}

2. Also tried
   resource "openstack_compute_instance_v2" "bastion" {
   name = "${ timestamp }"

however name is set as "${ timestamp }"

Can someone please help ? Am I missing something ?

[phinze]

Hi @dattatrayakumbhar04! There's no Timestamp functionality currently in Terraform. Nowadays it would probably be implemented as a Data Source.

We do have a good story for unique identifiers using the random_id data source, though.

That would look something like this:

data "random_id" "bastion" {
  byte_length = 8
}
resource "openstack_compute_instance_v2" "bastion" {
  name = "bastion-${data.random_id.bastion.hex}"
}

[ghost]

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