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-rw-r--r--ops/terraform/deploy-nixos/main.tf13
-rwxr-xr-xops/terraform/deploy-nixos/nixos-eval.sh7
2 files changed, 15 insertions, 5 deletions
diff --git a/ops/terraform/deploy-nixos/main.tf b/ops/terraform/deploy-nixos/main.tf
index 3ff7bfc3f30a..d39610327a0e 100644
--- a/ops/terraform/deploy-nixos/main.tf
+++ b/ops/terraform/deploy-nixos/main.tf
@@ -24,6 +24,16 @@ variable "target_host" {
   type        = string
 }
 
+variable "entrypoint" {
+  description = <<EOT
+    Path to a .nix file (or directory containing `default.nix` file)
+    that provides the attrset specified in `closure`.
+    If unset, asks git for the root of the repository.
+  EOT
+  type        = string
+  default     = ""
+}
+
 variable "target_user" {
   description = "username on the target machine"
   type        = string
@@ -40,7 +50,8 @@ data "external" "nixos_system" {
   program = ["${path.module}/nixos-eval.sh"]
 
   query = {
-    attrpath = var.attrpath
+    attrpath   = var.attrpath
+    entrypoint = var.entrypoint
   }
 }
 
diff --git a/ops/terraform/deploy-nixos/nixos-eval.sh b/ops/terraform/deploy-nixos/nixos-eval.sh
index dd15784b1b49..38f036bba936 100755
--- a/ops/terraform/deploy-nixos/nixos-eval.sh
+++ b/ops/terraform/deploy-nixos/nixos-eval.sh
@@ -5,12 +5,11 @@ set -ueo pipefail
 
 # Load input variables from Terraform. jq's @sh format takes care of
 # escaping.
-eval "$(jq -r '@sh "ATTRPATH=\(.attrpath)"')"
+eval "$(jq -r '@sh "ATTRPATH=\(.attrpath) && ENTRYPOINT=\(.entrypoint)"')"
 
 # Evaluate the system derivation.
-# TODO: configurable REPO_ROOT
-REPO_ROOT=$(git rev-parse --show-toplevel)
-SYSTEM_DRV=$(nix-instantiate -A "${ATTRPATH}" "${REPO_ROOT}")
+[[ -z "$ENTRYPOINT" ]] && ENTRYPOINT=$(git rev-parse --show-toplevel)
+SYSTEM_DRV=$(nix-instantiate -A "${ATTRPATH}" "${ENTRYPOINT}")
 
 # Return system derivation back to Terraform.
 jq -n --arg drv "$SYSTEM_DRV" '{"drv":$drv}'