terraform

gcp project validate

variable "project_id" {
  description = "The name of the Google Project ID where the keys will be stored. eg: 'my-project'"
  type        = string
}

data "google_projects" "prj" {
  filter = "id:${var.project_id}"
  lifecycle {
    postcondition {
      condition     = length(self.projects) == 1
      error_message = "invalid project id"
    }
  }
}

get change directories

#!/usr/bin/env bash
set -eExo pipefail
GITHUB_BASE_REF=${GITHUB_BASE_REF:-master}

# we want a list of changed directories
# expected output: 'value=["dir1","dir2"]'

# start a list of changed directories
changed_dirs=()

# read directories into the array
# find out which project folders were updated
# GITHUB_BASE_REF is the name of the base ref or target branch of the pull request
# unique dirs with terraform files

# TODO diff-filter=ACMRT don't display removed files
# would orphan infrastructure, need to destroy

readarray -t -O "${#changed_dirs[@]}" changed_dirs < <(
	git diff \
		--name-only \
		"origin/${GITHUB_BASE_REF:-master}" |
		grep -E ".tf$" |
		xargs dirname |
		uniq
)

# build a json array [ "dir1" , "dir2" ]
output=('value=[')
while [ ${#changed_dirs[@]} -gt 0 ]; do
	# make sure to add quotes
	output+=(\""${changed_dirs[0]}"\")
	# add commas if not the last item
	[ ${#changed_dirs[@]} -gt 1 ] && output+=(',')
	# remove the item we just added
	changed_dirs=("${changed_dirs[@]:1}")
done
# finalize the json
output+=(']')
printf "%s" "${output[@]}" >>"${GITHUB_OUTPUT:-/dev/stdout}"

mutliline

mystring = yamldecode(<<-EOT
  x: >-
    fgr
    grg
    gr
  EOT
).x

validate

locals {
  inputs = [
    "foo",
    "bar",
    "baz"
  ]
}

variable "input" {
  type        = string
  description = "the input. eg: 'foo' " # would be nice to do 'join(",",local.inputs)'
  default     = "foo"
}

resource "null_resource" "valid_inputs" {
  lifecycle {
    precondition {
      condition     = contains(var.input, locals.inputs)
      error_message = "input is unacceptable, please select from: ${join(",", local.inputs)}"
    }
  }
}