Fix: TF schema check fails on Gitlab

… because no providers are installed.

.gitlab-ci.yml

@@ -59,7 +59,6 @@ deploy:
   extends: .base
   stage: deploy
   script:
-    - terraform version
     - make -C terraform check_schema
     - make package
     - make auto_deploy

src/azul/terraform.py

@@ -2,6 +2,7 @@
     chain,
 )
 import json
+import logging
 from pathlib import (
     Path,
 )
@@ -32,6 +33,8 @@
     JSONs,
 )
 
+log = logging.getLogger(__name__)
+
 
 @attr.s(auto_attribs=True, kw_only=True, frozen=True)
 class TerraformSchema:
@@ -70,7 +73,9 @@ def taggable_resource_types(self) -> Sequence[str]:
 
     def run(self, *args: str) -> str:
         terraform_dir = Path(config.project_root) / 'terraform'
-        cmd = subprocess.run(['terraform', *args],
+        args = ['terraform', *args]
+        log.info('Running %r', args)
+        cmd = subprocess.run(args,
                              cwd=terraform_dir,
                              check=True,
                              stdout=subprocess.PIPE,
@@ -102,7 +107,9 @@ def versions(self) -> Sequence[str]:
         # `terraform -version` prints a warning if you are not running the latest
         # release of Terraform; we discard it, otherwise, we would need to update
         # the tracked schema every time a new version of Terraform is released
-        versions, footer = self.run('-version').split('\n\n')
+        output = self.run('-version')
+        log.info('Terraform output:\n%s', output)
+        versions, footer = output.split('\n\n')
         return sorted(versions.splitlines())
 
 

terraform/Makefile

@@ -3,11 +3,15 @@ all: apply
 
 include ../common.mk
 
+.PHONY: providers
+providers: check_terraform check_branch check_aws providers.tf.json backend.tf.json
+	terraform init
+
 .PHONY: config
 config: $(patsubst %.template.py,%,$(wildcard *.tf.json.template.py))
 
 .PHONY: init
-init: check_terraform check_branch check_aws config
+init: providers config
 	terraform init
 
 .PHONY: rename_resources
@@ -70,7 +74,9 @@ update_schema: init
 	python $(project_root)/scripts/terraform_schema.py update
 
 .PHONY: check_schema
-check_schema: check_terraform
+# Depend on init to ensure provider plugins are installed. Without it
+# we wouldn't be able to check their versions against those in the schema.
+check_schema: providers
 	@if ! python $(project_root)/scripts/terraform_schema.py check; then \
 		echo -e "\nRun '$(MAKE) update_schema'.\n"; \
 		false; \