Terragrunt dependencies solver (Terrasolver)

This tool is aimed to solve issue with resolving dependencies among a set of Terragrunt modules and run provided Terragrunt command for each module in a sequence automatically.

It works pretty the same way as Terragrunt: you put a Terraform command and command line options and terrasolver will propagate all this to terragrunt and it will do its job as usual. :)

How to build

Included script build.sh builds binary for three of supported platforms: MacOS X (amd64), MacOS X (arm64), Linux (amd64)

$ ./build.sh
$ ls -1 terrasolver_*                                                                                                           burmuley@RRG-MacPro15
terrasolver_linux_amd64
terrasolver_mac_amd64
terrasolver_mac_arm64

How to use

terrasolver [flags] [terragrunt command and parameters]

Supported flags:

• -path - Path to the working directory where to run all activities. Is omitted will use current directory.
• -skip-confirm - Skip confirmation step after the ordered list modules is displayed, will continue with running Terragrunt command against each module.
• -terragrunt - Path to the Terragrunt binary. The default is /usr/local/bin/terragrunt
• -deepdive - If set to false will only scan current working directory for dependencies, If set to true - will also recursively scan dependencies referenced in files within the working directory to build the complete dependency tree if any of modules enlist dependencies out of the working directory.
• -tf-cache-dir - enables Terraform provider plugin cache directory and exports corresponding environment variable TF_PLUGIN_CACHE_DIR for each module when running; default value is ~/.terraform.d/plugin-cache
• -no-cache - disable Terragrunt modules "caching"
• -cache-duration - how long (in minutes) modules listed in cache won't be run; default value is 30 minutes
• -supress-warning - suppress warning messages about dependency graph processing; default is true
• -version - displays version and build information

Most of the flags listed above can be also overridden by corresponding environment variables.

Note: values set with environment variables take precedence over values in command line!

• TERRASOLVER_PATH - same as -path flag
• TERRASOLVER_SKIP_CONFIRM - same as -skip-confirm flag
• TERRASOLVER_TERRAGRUNT_BIN - same as -terragrunt flag
• TERRASOLVER_DEEP_DIVE - same as -deepdive flag
• TF_PLUGIN_CACHE_DIR - overrides value set with -tf-cache-dir, uses the same variable name as Terraform
• TERRASOLVER_SUPPRESS_WARNINGS - same as -supress-warning
• TERRASOLVER_NO_CACHE - same as -no-cache

Example:

$ terrasolver -path=/home/user/infrastructure/dev -deepdive=true apply -auto-approve
2022/06/08 21:01:18 Terragrunt modules directory: /home/user/infrastructure/dev
Running order for modules in '/home/user/infrastructure/dev':
#1: /home/user/infrastructure/dev/us-west-2/ecs-clusters
#2: /home/user/infrastructure/dev/us-west-2/target-groups
#3: /home/user/infrastructure/dev/us-west-2/load-balancers
#4: /home/user/infrastructure/dev/us-west-2/kms-keys
#5: /home/user/infrastructure/dev/us-east-1/kms-replica-keys
#6: /home/user/infrastructure/dev/us-west-2/s3-buckets
#7: /home/user/infrastructure/dev/us-east-1/s3-buckets
#8: /home/user/infrastructure/dev/global/iam-roles
#9: /home/user/infrastructure/dev/us-west-2/code-deploy
Press ENTER to continue...
...
<then it simply runs `terragrunt [command] for each module in the list above`>