purgeresourcegroup.ps1

param ([Parameter(Mandatory)][string]$ResourceGroup)

<#
This PS script will delete all resources from the specified resource group

Does it use Azure CLI?
-----------------------
Yes

How does it work ?
-----------------
It attempts to delete in an infite loop till no more resources are left. This strategy takes care of resources
which are hard to delete due to interdependencies
#>



function DeleteResources()
{
    Write-Host "Building list of resources in the resource group '$ResourceGroup'"
    $count_deleted=0
    $resources=(az resource list --resource-group $ResourceGroup | ConvertFrom-Json -AsHashTable)

    if ($null -eq $resources)
    {
        Write-Host "No resources found"
        return $count_deleted
    }
    Write-host ("Found {0} resources" -f $resources.Count)
    
    foreach($resource in $resources) 
    { 
    
        try {
            $id=$resource["id"] 
            Write-Host "Going to delete resource with id: $id"
            & az resource delete --ids $id --verbose
            $count_deleted+=1
        }
        catch {
            Write-Host $_
        }
    }
    return $count_deleted
}

function DeleteInLoop {
    while ($true) 
    {
        $deleted=DeleteResources
        if (0 -eq $deleted)
        {
            Write-Host "No more resources to delete"
            break;
        }
        Write-Host "No of resources deleted=$deleted Going to try again"
    }
}    

$subscription=& az account show --query name
Write-Host "Current subscription is: $subscription"

Write-Host "You entered Resource Grou: $ResourceGroup"

$passphrase= ("iamsure{0}" -f (Get-date).Millisecond)
$choice=Read-Host -Prompt "This script will delete all resources from the specified resource group. Type $passphrase to coninue"
if ($passphrase -ne $choice)
{
    Write-Host "Does not match the expected pass phrase $passphrase. Quitting"
    exit
}
DeleteInLoop