Example below is using Bash for variable variables subtitution.
$ hello="Hello World"
$ foobar="hello"
$ echo "${!foobar}"
Hello WorldThis is for other shell which do not recognize "${!}" syntax. It utilise eval so use it with caution.
$ hello="Hello World"
$ foobar="hello"
$ eval echo "\$${foobar}"
Hello World
Terraform resource that having lifecycle prevent_destroy = true can not be destroyed. You need to manually edit the file inplace and change the value prevent_destroy to false manually each time you want to destroy the resource. Instead of having to edit manually and make git status dirty we can automate this using simple shell script.
The idea is simple.
prevent_default = true to prevent_default = falseterraform destroy command
prevent_default = true#!/bin/bash
$ find . -name '*.tf' -type f \
-exec perl -i -pe 's@prevent_destroy = true@prevent_destroy = false@g' {} \;
# Run terraform destroy
[ "$IS_PLAN" = "yes" ] && terraform plan -destroy || terraform destroy $@
# Revert the changes
$ find . -name '*.tf' -type f \
-exec perl -i -pe 's@prevent_destroy = false@prevent_destroy = true@g' {} \;terraform plan -destroy command use the following.
$ IS_PLAN=yes bash terraform-force-destroy.sh$ bash terraform-force-destroy.sh -auto-approveterraform destroy.