make built image name/version smarter

Author: sjpb

packer/openstack.pkr.hcl

@@ -23,7 +23,8 @@ data "git-commit" "cwd-head" { }
 locals {
     git_commit = data.git-commit.cwd-head.hash
     timestamp = formatdate("YYMMDD-hhmm", timestamp())
-    image_version = var.image_version == "" ? "${local.timestamp}-${substr(local.git_commit, 0, 8)}" : var.image_version
+    image_version = var.image_version == "auto" ? "${local.timestamp}-${substr(local.git_commit, 0, 8)}" : var.image_version
+    image_name = replace(var.image_name, '/', '-')
 }
 
 # Path pointing to root of repository - automatically set by environment variable PKR_VAR_repo_root
@@ -157,14 +158,14 @@ variable "inventory_groups" {
 
 variable "image_name" {
   type = string
-  description = "Built image name"
+  description = "Built image name. Any '/' are replaced with '-'."
   default = "openhpc"
 }
 
 variable "image_version" {
   type = string
-  description = "Suffix for built image names. If not supplied a timestamp+git commit is used"
-  default = ""
+  description = "Suffix for built image names. Default special value 'auto' uses a timestamp+git commit"
+  default = "auto"
 }
 
 source "openstack" "openhpc" {
@@ -202,7 +203,7 @@ build {
 
   source "source.openstack.openhpc" {
     name = "rocky-latest"
-    image_name = "${var.image_name}-${local.image_version}"
+    image_name = join("-", [local.image_name, local.image_version])
   }
 
   provisioner "ansible" {