Local-exec using powershell throws Cannot index into a null array

Question

Had some help in getting PowerShell command to run in Terraform local-exec See here for code. Just hit the next hurdle as that I can now run various 'get-az' commands with parameters but if I want to run

Update-AzFunctionAppSetting -ResourceGroupName "MyResourceGroup" -Name "MyFunctionApp" -SubscriptionId "MySubscriptionId" -AppSetting @{"testmw" = "2"}

it throws an error: Update-AzFunctionAppSetting : Cannot index into a null array.

If the answer was helpful, Please Accept it as an Answer, so that others who encounter the same issue can find this solution and fix their problem. — Ansuman Bal
– Ansuman Bal, Commented Jan 5, 2022 at 14:10

Ansuman Bal · Accepted Answer · 2021-12-21 16:01:39Z

0

Please use the below code as per your requirement :

provider "azurerm" {
  features{}
}
data "azurerm_resource_group" "example"{
    name = "ansumantest"
}
variable "function_apps" {
  default = ["ansumanfunc1","ansumanfunc2"]
}
variable "Subscription" {
    default = "SubID"
}
resource "null_resource" "example2" {
  count = length(var.function_apps)
  provisioner "local-exec" {
    command = <<Settings
    $ResourceGroupName = "${data.azurerm_resource_group.example.name}"
    $FunctionAppName = "${var.function_apps[count.index]}"
    $SubscriptionId = "${var.Subscription}"
    Get-AzFunctionApp -ResourceGroupName $ResourceGroupName -Name $FunctionAppName -SubscriptionId $SubscriptionId
    Update-AzFunctionAppSetting -ResourceGroupName $ResourceGroupName -Name $FunctionAppName -SubscriptionId $SubscriptionID -AppSetting @{"testmw" = "2"}
    Settings

    interpreter = ["PowerShell", "-Command"]
  }
}

Output:

answered Dec 21, 2021 at 16:01

Ansuman Bal

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9 Comments

MWOITC Over a year ago

No luck. Just using Get-AzFunctionApp -ResourceGroupName $ResourceGroupName -Name $FunctionAppName -SubscriptionId $SubscriptionId works but Update-AzFunctionAppSetting -ResourceGroupName $ResourceGroupName -Name $FunctionAppName -SubscriptionId $SubscriptionID -AppSetting @{"testmw" = "2"} fails with │ Update-AzFunctionAppSetting : Cannot index into a null array. │ At line:13 char:7 │ + Update-AzFunctionAppSetting -ResourceGroupName $ResourceGroupNa ... │ + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

MWOITC Over a year ago

│ + CategoryInfo : InvalidOperation: (:) [Update-AzFunctionAppSetting], RuntimeException │ + FullyQualifiedErrorId : NullArray,Update-AzFunctionAppSetting

Ansuman Bal Over a year ago

@MWOITC, can you please add the whole updated code that you are using now ? so that I can test the same code ..

MWOITC Over a year ago

Sure: code resource "null_resource" "az_command" { triggers = { uuid_trigger = "${uuid()}" } provisioner "local-exec" { interpreter = ["PowerShell", "-Command"] command = <<EOT $ResourceGroupName = "${module.rg.resource_group.name}" $FunctionAppName = "${var.function_apps.name}" $SubscriptionId = "${module.functionapp.function_app.id}"

MWOITC Over a year ago

code Get-AzFunctionApp -ResourceGroupName $ResourceGroupName -Name $FunctionAppName -SubscriptionId $SubscriptionId Update-AzFunctionAppSetting -ResourceGroupName $ResourceGroupName -Name $FunctionAppName -SubscriptionId $SubscriptionID -AppSetting @{"testmw" = "2"} EOT } }

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