Guesses terraform imports based on outputted plan

terraform-import-mv-guesser.py

#!/usr/bin/env python3
# Currently works for 0.12.x
#
# TODO:
# - use json output instead of stdout
#
# Usage:
#   terraform plan > plan.out
#   python terraform-import-statement-guesser.py plan.out
import sys
import re


# https://stackoverflow.com/a/38662876/2965993
def escape_ansi(line):
    ansi_escape = re.compile(r'(?:\x1B[@-_]|[\x80-\x9F])[0-?]*[ -/]*[@-~]')
    return ansi_escape.sub('', line)


plan_file = sys.argv[1]
with open(plan_file, "r") as f:
  destroyed = []
  created = []
  for line in f:
    line = escape_ansi(line.rstrip("\n"))
    if not 'will be' in line:
      continue
    line_split = line.split()
    resource_name = line_split[2]

    created_or_destroyed = line_split[-1]
    if 'destroyed' in created_or_destroyed:
      destroyed.append(resource_name)
    elif 'created' in created_or_destroyed:
      created.append(resource_name)
    else:
      print('dafuq')
      continue

# iterate through all the created resources
not_found = []
for resource in created:
  # get the short resource name
  resource_name = resource_name_trimmed = resource.split('.')[-1]
  # trim the array portion if it exists
  if '[' in resource_name:
    resource_name_trimmed = resource_name[:resource_name.find('[')]
  # iterate through all the destroyed resources and see which one matches the created one
  found = False
  for des_resource in destroyed:
    # do the same thing. get the short resource name of destroyed, trim it
    des_resource_name = des_resource_name_trimmed = des_resource.split('.')[-1]
    if '[' in des_resource_name:
      des_resource_name_trimmed = des_resource_name[:des_resource_name.find('[')]
    # funky logic and is error prone
    ## if the untrimmed names match, print the move statement
    ## or if the trimmed names match, print the move statement
    if (des_resource_name == resource_name) or (des_resource_name_trimmed == resource_name_trimmed):
      print('terraform state mv "{}" "{}"'.format(des_resource, resource))
      found = True
      break
  if not found:
    not_found.append(resource)


if len(not_found) > 0:
  print('Could not find instances...')
  for resource in not_found:
    print(resource)

terraform-import-mv-manual.sh

terraform show \
  -json | \
  jq -r \
    '.values.root_module.resources[].address' | \
    while read address; do \
      echo "terraform state mv $address module.ecs_shared.$address"; \
    done