diff --git a/action.yml b/action.yml
index 5eef415..74e515f 100644
--- a/action.yml
+++ b/action.yml
@@ -29,8 +29,10 @@ inputs:
     description: 'Additional reviewdog flags'
     default: ''
   ### Variables for terraform validate ###
+  terraform_init_options:
+    description: 'options for terraform init to pass backend configuration and so on'
   envvar:
-    description: 'Environment variables for terraform init'
+    description: 'Environment variables for terraform init to pass backend configuration'
   terraform_version:
     description: 'The terraform version to install and use. The default is `latest`'
 runs:
diff --git a/entrypoint.sh b/entrypoint.sh
index 58fb2eb..3f3198a 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -11,7 +11,9 @@ echo "${INPUT_ENVVAR}" | while IFS= read -r line; do
   export line
 done
 
-terraform init
+printenv
+
+terraform init ${INPUT_TERRAFORM_INIT_OPTIONS}
 terraform validate -json \
   | jq -r '.diagnostics[] | "\(.range.filename):\(.range.start.line):\(.range.start.column): \(.detail)"' \
   | reviewdog -efm="%f:%l:%c:%m" \
diff --git a/testdata/.gitignore b/testdata/.gitignore
deleted file mode 100644
index c035e72..0000000
--- a/testdata/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-.terraform
-.terraform.lock.hcl