Set of Python-based CLI tools for working with Terraform configurations
Set of Python-based CLI tools for working with Terraform configurations in bulk
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Table of Contents
auto.tfvarsinheritance. Terrawrap makes it easier to share variables between Terraform directories through inheritance of
Remote S3 backend generation. Terrawrap makes it easier to work with AWS S3 remote state backends by generating configuration for them.
Repository level plan/apply. Terrawrap provides commands for running plan/apply recursively on a entire repository at once.
Make Terraform DRY for large organizations. A Terraform best practices is to break up Terraform configs into many small state files. This leads to an explosion in boilerplate code when using Terraform in large organizations with 100s of state files. Terrawrap reduces some boilerplate code by providing
auto.tfvarsinheritance and generating backend configurations.
Make Terraform code easier to manage. Terraform only runs commands on a single directory at a time. This makes working with hundreds of terraform directories/state files hard. Terrawrap provides utilities for running commands against an entire repository at once instead of one directory at a time.
All Terraform code should be valid Terraform. Any Terraform code used with Terrawrap should be runnable with Terraform by itself without the wrapper. Terrawrap does not provide any new syntax.
Terrawrap is not a code generator. Generated code is harder to read and understand. Code generators tend to lead to leaky abstractions that can be more trouble than they are worth. However, Terrawrap does generate remote backend configs as a workaround to Terraform's lack of support for variables in backend configs (See https://github.com/hashicorp/terraform/issues/13022). We expect this to be the only instance of code generation in Terrawrap.
Terrawrap requires Python 3.6.0 or higher to run.
This package can be installed using
pip install terrawrap
You should now be able to use the
Building From Source
tox>=2.9.1 is recommended.
tox. You will need to install tox with
pip install tox.
tox will automatically execute linters as well as the unit tests.
You can also run them individually with the
tox -e py37-unit will run the unit tests for python 3.7
To see all the available options, run
Terrawrap can be configured via a
.tf_wrapper file. The wrapper will walk the provided configuration
path and look for
.tf_wrapper files. The files are merged in the order that they are discovered. Consider
the below example:
foo ├── bar │ └── .tf_wrapper └── .tf_wrapper
If there are conflicting configurations between those two
.tf_wrapper files, the
.tf_wrapper file in
foo/bar will win.
The following options are supported in
configure_backend: True # If true, automatically configure Terraform backends. pipeline_check: True # If true, require this directory to be in a pipeline file. envvars: <NAME_OF_ENVVAR>: source: # The source of the envvar. Currently only `ssm` is supported. path: # If the source of the envvar is `ssm`, the SSM Parameter Store path to lookup the value of the environment variable from.
Terrawrap automatically adds
-var-file arguments to any terraform command by scanning for
files in the directory structure.
For example, the following command
tf config/foo/bar apply with the following directory structure:
config ├── foo | └── bar | │ ├── baz.tf | │ └── bar.auto.tfvars | └── foo.auto.tfvars └── config.auto.tfvars
will generate the following command:
terraform apply -var-file config/config.auto.tfvars \ -var-file config/foo/foo.auto.tfvars \ -var-file config/foo/bar/bar.auto.tfvars
Terraform S3 Remote State
Terrawrap supports automatically configuring S3 remote backends. It will inject the appropriate
args when running
For example, the Terrawrap command
tf config/foo/bar init will generate a Terraform command like
terraform init -reconfigure \ -backend-config=dynamodb_table=<lock table name> \ -backend-config=encrypt=true \ -backend-config=key=config/foo/bar.tfstate \ -backend-config=region=<region name> \ -backend-config=bucket=<state bucket name> \ -backend-config=skip_get_ec2_platforms=true \ -backend-config=skip_region_validation=true \ -backend-config=skip_credentials_validation=true
Terrawrap configures the backend by looking for
.tf_wrapper files in the directory structure. The following
options are supported. See the Terraform S3 backend documentation for information about each option.
backends: s3: region: role_arn: bucket: dynamodb_table:
|bucket||Yes||Name of S3 Bucket|
|region||Yes||AWS Region that S3 state bucket and DynamoDB lock table are located in|
|dynamodb_table||No||DynamoDB table to use for state locking. Locking is disable if lock_table is not set|
|role_arn||No||AWS role to assume when reading/writing to S3 bucket and lock table|
The S3 state file key name is generated from the directory name being used to run the terraform command.
tf config/foo/bar init uses a state file with the key
config/foo/bar.tfstate in S3
tf <directory> <terraform command> runs a terraform command for a given directory that contains
Terrawrap automatically includes autovars as described above when running the given command. Any Terraform
command is supported
plan_check <directory> runs
terraform plan recursively for all child directories starting at the given directory.
git to identify which files have changed compared with the
master branch. It will then run
on any directory that contains
tf files with the following criteria
- A directory that has files that changed
- A directory that is symlinked to a directory that has files changed
- A directory with symlinked files that are linked to files that changed
- A directory that that uses a Terraform module whose source changed
- A directory with Terraform files that refer to an autovar file that changed
backend_check [directory] verifies that all directories under the given directory that contain
also have Terraform Backends defined.
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