Passing Parameters to Linked ARM Templates

master-deployment.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "environment": {
      "type": "string",
      "allowedValues": [
        "dev", "test", "pprd", "prod"
      ]
    },
    "sasToken": {
      "type": "string"
    }
  },
  "variables": {
    "baseTemplateUrl": "[concat('https://sa0', parameters('environment'), '.blob.core.windows.net/templates/')]",
    "linkedTemplates": [
      {
        "name": "web-template",
        "templateUrl": "[concat(variables('baseTemplateUrl'), 'app-deployment.json')]",
        "parameterUrl": "[concat(variables('baseTemplateUrl'), 'app-deployment-web.params.json')]"
      },
      {
        "name": "sql-template",
        "templateUrl": "[concat(variables('baseTemplateUrl'), 'sql-deployment.json')]",
        "parameterUrl": "[concat(variables('baseTemplateUrl'), 'sql-deployment.params.json')]"
      }
    ]
  },
  "resources": [
    {
      "apiVersion": "2015-01-01",
      "name": "[concat('nestedTemplate-', variables('linkedTemplates')[copyIndex()].name)]",
      "type": "Microsoft.Resources/deployments",
      "copy": {
        "name": "templatesCopy",
        "count": "[length(variables('linkedTemplates'))]"
      },
      "properties": {
        "mode": "Incremental",
        "templateLink": {
          "uri": "[concat(variables('linkedTemplates')[copyIndex()].templateUrl, parameters('sasToken'))]",
          "contentVersion": "1.0.0.0"
        },
        "parametersLink": {
          "uri": "[concat(variables('linkedTemplates')[copyIndex()].parameterUrl, parameters('sasToken'))]",
          "contentVersion": "1.0.0.0"
        },
        "parameters": {
          "environment": {
            "value": "[parameters('environment')]"
          }
        }
      }
    }
  ]
}