generate provider.tf

[tormath1]

from the documentation, it's asked to create a provider.tf to use the generated HCL / tfstate files. Terracognita should be able to generate it by itself.

AWS

terraform {
 backend "local" {
   path = "./$TFSTATE_PATH"
 }
}

provider "aws" {
 access_key = var.access_key
 secret_key = var.secret_key
 region     = var.region
}

variable "access_key" {}
variable "secret_key" {}
variable "region" {}

Google

terraform {
 backend "local" {
   path = "./$TFSTATE_PATH"
 }
}
provider "google" {
  credentials = file("${var.credentials}")
  project     = var.project
  region     = var.region
}
variable "region" {}
variable "project" {}
variable "credentials" {}

TFSTATE_PATH and region could be filled from the CLI flags. The credentials could be filled to but it would required to have read / write permissions (TC only requires read permission)