feat: allow users to pass pre-start script

CHANGELOG.md

@@ -1,5 +1,10 @@
 # GCP Tamr VM module
 
+## v2.2.0 - April 28th 2023
+* Following optional input variables now available
+  * pre_start_script_content
+* Allow users to supply custom script to prepare VM
+
 ## v2.1.0 - April 25th 2023
 * Following optional input variables now available
   * metadata

README.md

@@ -39,6 +39,7 @@ This modules creates:
 | tamr\_zip\_uri | gcs location to download tamr zip from | `string` | n/a | yes |
 | labels | labels to attach to created resources | `map(string)` | `{}` | no |
 | metadata | custom metadata to attach to created VM | `map(string)` | `{}` | no |
+| pre\_start\_script\_content | custom script to run prior to startup\_script | `string` | `""` | no |
 | tamr\_external\_ip | Create and attach an external ip to tamr VM | `bool` | `false` | no |
 | tamr\_instance\_deletion\_protection | Enabled deletion protection for the tamr VM | `bool` | `true` | no |
 | tamr\_instance\_disk\_size | size of the boot disk | `number` | `100` | no |

VERSION

@@ -1 +1 @@
-2.1.0
+2.2.0

main.tf

@@ -2,6 +2,7 @@ locals {
   external_ip = var.tamr_external_ip == true ? 1 : 0
 
   startup_script = templatefile("${path.module}/templates/startup_script.sh.tmpl", {
+    pre_start_script    = var.pre_start_script_content
     tamr_zip_uri        = var.tamr_zip_uri
     tamr_config         = var.tamr_config_file
     tamr_home_directory = var.tamr_instance_install_directory

templates/startup_script.sh.tmpl

@@ -1,5 +1,10 @@
 #!/bin/bash
 
+# run any custom commands to prepare VM
+%{ if pre_start_script != "" }
+${pre_start_script}
+%{ endif }
+
 # create tamr user, to run tamr
 adduser --shell /bin/bash --home /home/tamr tamr
 
@@ -12,6 +17,8 @@ ${tamr_config}
 EOF
 )
 
+
+
 # check if tamr has been installed on the VM, if not download and install it
 if [[ ! -f ${tamr_home_directory}/tamr/start.sh ]]; then
     # download tamr install

variables.tf

@@ -102,6 +102,12 @@ variable "tamr_config_file" {
   description = "Override generated tamr configuration. The tamr configuration is specified using a yaml file, in the format that is documented (https://docs.tamr.com/previous/docs/configuration-configuring-unify#section-setting-configuration-variables) for configuring “many variables” at once."
 }
 
+variable "pre_start_script_content" {
+  default     = ""
+  type        = string
+  description = "custom script to run prior to startup_script"
+}
+
 #
 # file system
 #