Terraform - Azure how to get deployment webhook URL

Question

Using hashicorp/azurerm provider I want to set up a webhook that would trigger a deployment.

I have a web app that loads the newest Docker image on restart. However, I need a scmUri of the resource to setup the webhook:

resource "azurerm_linux_web_app" "web" {
  app_settings = {
    DOCKER_REGISTRY_SERVER_URL      = url
    DOCKER_REGISTRY_SERVER_USERNAME = data.azurerm_key_vault_secret.acr-service-principal-id.value
    DOCKER_REGISTRY_SERVER_PASSWORD = data.azurerm_key_vault_secret.acr-service-principal-password.value
    ...
  }
  ...
}

resource "azurerm_container_registry_webhook" "webhook" {
  service_uri = "<scm URL of the azurerm_linux_web_app.web>/docker/hook"
  ...
}

I have found a way to query the scmUri using various other languages... but nothing using the azurepm provider:

After everything is deployed I can also copy the scmUri manually from Azure, but I would prefer a fully automated setup:

I've now also found an option to define the scmUri as: https://${azurerm_linux_web_app.web.site_credential.0.username}:${azurerm_linux_web_app.web.site_credential.0.password}@${azurerm_linux_web_app.web.name}.scm.azurewebsites.net/docker/hook — Simon Kocurek
– Simon Kocurek, Commented Feb 1, 2023 at 9:53
You should probably write this as an answer as it looks like the only solution — Rijul Gupta
– Rijul Gupta, Commented May 28, 2023 at 5:06

mmai · Accepted Answer · 2023-10-17 22:51:41Z

This is what worked for me:

terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~> 3.28.0"
    }
    azapi = {
      source  = "Azure/azapi"
      version = "1.2.0"
    }
  }
}

...

resource "azurerm_linux_web_app" "web" {
  name                = "my-webapp"
  app_settings = {
    DOCKER_ENABLE_CI = "true"
    DOCKER_REGISTRY_SERVER_URL : "*****"
    WEBSITES_PORT : "8080"
  }
  ... # other settings
}


resource "azurerm_container_registry_webhook" "webhook" {
  service_uri         = "https://${azurerm_linux_web_app.web.site_credential.0.name}:${azurerm_linux_web_app.web.site_credential.0.password}@${azurerm_linux_web_app.web.name}.scm.azurewebsites.net/api/registry/webhook"
  location            = "*****"
  registry_name       = "*****"
  name                = "${replace(azurerm_linux_web_app.web.name, "/-|_|\\W/", "")}hook" # only alphanumeric characters allowed
  actions             = ["push"]
  resource_group_name = "*****"
}

The service_uri is a bit different than the URL in the comment under the question (so make sure to check how your webhook URL looks in the web application's deployment center section) and I had to use .web.site_credential.0.name instead of .web.site_credential.0.username to access the correct attribute.

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