The provided code snippet appears to be a PowerShell parameter...

The provided code snippet appears to be a PowerShell parameter block, commonly found in PowerShell functions or scripts to define inputs. Below is an explanation of what the code does:

Overview

The code defines a set of parameters that can be passed to a PowerShell script or function to configure its behavior. Here's a detailed breakdown of what each parameter does:

Parameters:

1. [Parameter(Mandatory = $true)] [string[]]$InstanceName

   • Purpose: Requires the user to input one or more instance names (an array of strings). This parameter is mandatory.

2. [string]$SshPrivateKeyPath = (Get-ChildItem ~/.ssh/id_rsa | Select-Object -ExpandProperty FullName)

   • Purpose: Defines the path to the SSH private key file.
   • Default Behavior: If not provided, it defaults to the full path of the id_rsa file from the ~/.ssh directory.

3. [string]$SshPublicKeyPath = "$SshPrivateKeyPath.pub"

   • Purpose: Defines the path to the SSH public key file.
   • Default Behavior: If not provided, it defaults to the private key path with a .pub suffix.

4. [int]$Ttl = 10800

   • Purpose: Defines the TTL (time-to-live) in seconds.
   • Default Value: 10800 seconds (3 hours).

5. [int]$LocalPort = 33890

   • Purpose: Specifies the local port number for some connection (e.g., SSH tunneling).
   • Default Value: 33890.

6. [string]$TenancyName = 'bmc_operator_access'

   • Purpose: Sets the name of the cloud tenancy or namespace used in the operation.
   • Default Value: 'bmc_operator_access'.

7. [ValidateSet(...)] [string]$Region

   • Purpose: Allows only specific values for the Region parameter.
   • Validation: Permits selection from a predefined list of regions (e.g., "ap-melbourne-1", "us-ashburn-1").
   • Mandatory: The exact use isn't shown here, but typically the user can only input one of the listed values.

8. [string]$OciProfile = 'DEFAULT'

   • Purpose: Specifies the profile name for OCI (Oracle Cloud Infrastructure).
   • Default Value: 'DEFAULT'.

9. [switch]$ForceAuth

   • Purpose: A flag or switch to enforce authentication.
   • Default Value: Not provided unless explicitly specified. Switch parameters are either $true (enabled) or $false (disabled) without needing a value.

10. [string]$CompartmentID = 'ocid1.compartment...'

    • Purpose: Specifies a default compartment ID (possibly related to OCI).
    • Default Value: Predefined OCID (Oracle Cloud Identifier) value.

11. [int]$TtlResumeThreshold = 3600

    • Purpose: Sets a threshold for resuming the operation based on TTL.
    • Default Value: 3600 seconds (1 hour).

12. [string]$RTSCredName

    • Purpose: Optionally specifies a credential name (possibly related to Real-Time Systems or authentication).

What Does This Code Do Collectively?

When included in a PowerShell script or function, this block:

1. Configures various input parameters used for handling a cloud-based (likely OCI-related) operation.
2. Manages resources like SSH keys, region selections, and time-to-live values for connections or operations.
3. Enforces strong typing, validation (e.g., region selection), and default behaviors for parameters.
4. Ensures required parameters (e.g., InstanceName) are always provided by marking them as mandatory.
5. Facilitates convenience by providing reasonable defaults for many parameters.

This is commonly used in automation scripts for infrastructure management, specifically for tasks like connecting to cloud instances, configuring SSH tunneling, or managing cloud tenancy-based operations.