fix: format to json format

terraform/nix-build/main.tf

@@ -1,5 +1,5 @@
 locals {
-  nix_options = var.nix_options == null ? "" : join(" ", [for k, v in var.nix_options :  "--option ${k} ${v}"])
+nix_options = "{\"options\": {${join(", ", [for k, v in var.nix_options :  "\"${k}\": \"${v}\""])} } }"
 }
 data "external" "nix-build" {
   program = [ "${path.module}/nix-build.sh" ]

terraform/nix-build/nix-build.sh

@@ -3,10 +3,13 @@ set -efu
 
 declare file attribute nix_options
 eval "$(jq -r '@sh "attribute=\(.attribute) file=\(.file) nix_options=\(.nix_options)"')"
-if [[ -n ${file-} ]] && [[ -e ${file-} ]]; then
-  out=$(nix build --no-link --json $(echo "$nix_options") -f "$file" "$attribute")
+options=$(echo "${nix_options}" | jq -r '.options | to_entries | map("--option \(.key) \(.value)") | join(" ")')
+if [[ -n ${file-} ]] && [[ -e ${fileh-} ]]; then
+  # shellcheck disable=SC2086
+  out=$(nix build --no-link --json $options -f "$file" "$attribute")
   printf '%s' "$out" | jq -c '.[].outputs'
 else
-  out=$(nix build --no-link --json $(echo "$nix_options") "$attribute")
+  # shellcheck disable=SC2086
+  out=$(nix build --no-link --json $options "$attribute")
   printf '%s' "$out" | jq -c '.[].outputs'
 fi

terraform/nix-build/variables.tf

@@ -12,5 +12,5 @@ variable "file" {
 variable "nix_options" {
   type = map(string)
   description = "the options of nix"
-  default = null
+  default = {}
 }