feat: make stack optional (#6)

* feat: make stack optional

* feat: add notes in README about TF_PROJECT_NAME

Author: jnoss

README.md

@@ -7,13 +7,14 @@ TLDR, but really, go read the post, it's way better then what I'm going to write
 The Current production [terraform version](https://github.com/FitnessKeeper/terraform-runkeeper#terraform-version) can be found here
 ### To create a new repo using the terraform-reference repo.
 
-- Clone the repo `git clone https://github.com/FitnessKeeper/terraform-reference`
-- Edit .env in the root of the repo, in particular make sure you add a TF_PROJECT_NAME
+- Clone the repo into a new directory for your project `git clone https://github.com/FitnessKeeper/terraform-reference terraform-<project name>`
+- Edit .env in the root of the repo, in particular make sure you add a TF_PROJECT_NAME (this should be the new name of the repo, `terraform-<project name>`)
   - When creating a `spike` make sure you update TF_SPINE in env if something other then `rk` is needed, at the time of this writing `rk` and `asics` are valid spines.
   - Also when creating ASICS `spikes` update to `TF_LOCK_TABLE=asics-services-terraformStateLock` 
+  - If needed, set TF_STACK for the `stack` variable
 - Initialize variables.tf, this only needs to be done once, when the repo is created run `./init-variables.tf.sh`
 -  Remove the old origin `git remote rm origin`
--  Add your new repo `git remote add origin https://github.com/FitnessKeeper/terraform-reference.git`
+-  Add your new repo `git remote add origin https://github.com/FitnessKeeper/terraform-<project name>.git`
 - Commit your changes
 - `git push -u origin master`
 - Edit variables.tf to reflect your new service

init-variables.tf.sh

@@ -13,6 +13,15 @@ echo $TF_PROJECT_NAME
 
 tf_spine="${TF_SPINE:-rk}"
 
+# Set stack if TF_STACK is set; if not, comment out the stack variable entirely
+if [[ "${TF_STACK}" ]] ; then
+  STACK_VAR_COMMENT_OPTIONAL=""
+  STACK_VAR_DEFAULT="$TF_STACK"
+else
+  STACK_VAR_COMMENT_OPTIONAL="# "
+  STACK_VAR_DEFAULT="ref"
+fi
+
 export VARIABLES_TF=$(cat <<EOF
 #  Variables.tf declares has the default variables that are shared by all environments
 # \$var.region, \$var.domain, \$var.tf_s3_bucket
@@ -58,7 +67,7 @@ variable "region" { default = "${aws_default_region}" }
 
 # This should be changed to reflect the service / stack defined by this repo
 # for example replace "ref" with "cms", "slackbot", etc
-variable "stack" { default = "ref" }
+${STACK_VAR_COMMENT_OPTIONAL}variable "stack" { default = "${STACK_VAR_DEFAULT}" }
 
 variable "tf_s3_bucket" {
   description = "S3 bucket Terraform can use for state"