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Project Configuration ​

Any Git repository is considered to be a Terramate project. Additionally, Terramate does not depend on user configuration and comes with a set of sensible defaults that can be overwritten by adding a terramate.tm.hcl file at the root of your repository.

Configurations are valid project-wide and can be defined only once at the project root. All project configurations are defined within the terramate block.

hcl
# terramate.tm.hcl

terramate {
  # allow any Terramate v0.8.x version starting at v0.8.2
  required_version = "~> 0.8.2"

  config {
    # config options
  }
}

The terramate.required_version attribute ​

Required version is defined by the attribute terramate.required_version attribute where required_version accepts a version constraint string that specifies which versions of Terramate can be used inside a Terramate project.

The terramate.required_version_allow_prereleases attribute controls if prereleases should be matched according to Semantic Versioning precedence ordering. It's false by default and if set to true, then Terramate will also accept prereleases if they match the provided constraint.

It is generally advised against modifying infrastructure code without possessing a comprehensive understanding of its function and impact. Ensure extreme caution when considering experimental releases, given that they can potentially lead to dangerous changes.

We recommend pinning the exact version to use and updating the config when updating Terramate.

The version constraint string uses the same notation as the one used on Terraform.

Valid examples:

hcl
terramate {
  # allow any Terramate v0.8.x version starting at v0.8.2
  required_version = "~> 0.8.2"
}
hcl
terramate {
  # allow any Terramate v0.8.x version starting at v0.4.2
  required_version = ">= 0.8.2, < 0.9.0"
}

If a terramate.required_version is not defined within a project, no versioning checks will be carried out. If a version constraint is specified and an incompatible version of Terramate is run, a fatal error will occur.

The terramate.config block ​

Project-wide configuration can be defined in this block. All possible settings are described in the following subsections.

The terramate.config.git block ​

Git integration related configurations used in the Change Detection and Safe Guards are defined inside the terramate.config.git block, like this:

hcl
terramate {
  config {
    git {
      # Git configuration
      default_remote = "origin"
      default_branch = "main"

      # Safeguard
      check_untracked   = false # Deprecated as of v0.4.5 (use terramate.config.disable_safeguards instead)
      check_uncommitted = false # Deprecated as of v0.4.5 (use terramate.config.disable_safeguards instead)
      check_remote      = false # Deprecated as of v0.4.5 (use terramate.config.disable_safeguards instead)
    }
  }
}

The terramate.config.generate block ​

The terramate.config.generate block can be used to configure the code generate feature. For now, only the hcl_magic_header_comment_style attribute is supported and it can be used to define which HCL comment style must be used by Terramate when generating HCL files. Example below:

terramate {
  config {
    generate {
      hcl_magic_header_comment_style = "#"
    }
  }
}

The config above will make Terramate generate files using # as comment style. The only valid options are // and #.

The terramate.config.run Block ​

Configuration for the terramate run command can be set in the terramate.config.run block.

Disable code generation check ​

By default, terramate run will check that all generated code is up to date and throw an error if not:

sh
ERR outdated code found action=checkOutdatedGeneratedCode() filename=stg/ec2/_provider.tf
FTL please run: 'terramate generate' to update generated code error="outdated generated code detected" action=checkOutdatedGeneratedCode()

If you want to disable this default safe-guard, you can set check_gen_code = false in the terramate.config.run block.

hcl
terramate {
  config {
    run {
      check_gen_code = false # Deprecated as of v0.4.5 (use terramate.config.disable_safeguards instead)
    }
  }
}

TIP

This check ensures that it's not possible to accidentally run against outdated code and we discourage disabling it.

The terramate.config.run.env Block ​

In terramate.config.run.env block a map of environment variables can be defined that will be set when running a command using terramate run. The block has the same hierarchical properties of Globals, which means definitions in parent directories are inherited in child directories.

Hierarchical properties:

  • Any variable defined on a higher level will be inherited to the full subtree including nested stacks.
  • Any variable redefined on the same level conflicts.
  • Any variable redefined on lower levels will overwrite previous definitions.
  • All values will be only evaluated on stack level (Lazy Evaluation).
  • Any null value will be treated as unset and no variable will be exported.
  • To unset a variable on a lower level you can assign unset value or null.

The following example exports the TF_PLUGIN_CACHE_DIR environment variable to enable Terraform Provider Plugin Caching.

hcl
terramate {
  config {
    run {
      env {
        TF_PLUGIN_CACHE_DIR = "/some/path/etc"
      }
    }
  }
}

Inside the terramate.config.run.env block the env namespace will be available including environment variables retrieved from the host:

hcl
terramate {
  config {
    run {
      env {
        TF_PLUGIN_CACHE_DIR = "${env.HOME}/.terraform-cache-dir"
      }
    }
  }
}

In addition, Globals (global.*) and Metadata (terramate.*) are available and are evaluated lazy within the stack context the commands are executed in.

The env namespace is meant to give access to the host environment variables, it is read-only, and is only available when evaluating terramate.config.run.env blocks.

Any attributes defined on terramate.config.run.env blocks won't affect the env namespace.

You can have multiple terramate.config.run.env blocks defined on different files, but variable names cannot be defined twice.

The terramate.config.cloud block ​

Properties related to Terramate Cloud can be defined inside the terramate.config.cloud block. Currently, this block is only used to set the default cloud organization name:

hcl
terramate {
  config {
    cloud {
      organization = "my-org-name"
    }
  }
}

Setting a cloud organization name is required when

  • syncing with Terramate Cloud, i.e. by using terramate run with the --sync-drift-status or --sync-deployment options, and
  • the user is a member of more than one cloud organization.

The specified name will be used to select which of the user's organizations to use in the scope of the project.

It's also possible to select a cloud organization by setting the environment variable TM_CLOUD_ORGANIZATION to the organization name. If set, the value from the environment variable will override the configuration setting.