Adds feature to uninstall Icinga for Windows

doc/31-Changelog.md

@@ -20,6 +20,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 * [#205](https://github.com/Icinga/icinga-powershell-framework/pull/205) Ensure Icinga for Windows configuration file is opened as read-only for every single task besides actually modifying configuration content
 * [#207](https://github.com/Icinga/icinga-powershell-framework/pull/207) Adds new Argument `-LabelName` to `New-IcingaCheck`, allowing the developer to provide custom label names for checks and override the default based on the check name.
 * [#210](https://github.com/Icinga/icinga-powershell-framework/pull/210) Updates the Icinga DSL for building PowerShell arrays to ensure all string values are properly escaped with `'`. In case the user already wrapped commands with `'` by himself, this will not have an effect as we only add single quotes for escaping if they are not present already
+* [#211](https://github.com/Icinga/icinga-powershell-framework/pull/211) Adds feature to uninstall single components for Icinga for Windows or to uninstall everything and start entirely from new
 
 ### Bugfixes
 

lib/core/framework/Uninstall-IcingaForWindows.psm1

@@ -0,0 +1,72 @@
+<#
+.SYNOPSIS
+    Uninstalls every PowerShell module within the icinga-powershell-* namespace
+    including the Icinga Agent with all components (like certificates) as well as
+    the Icinga for Windows service and the Icinga PowerShell Framework.
+.DESCRIPTION
+    Uninstalls every PowerShell module within the icinga-powershell-* namespace
+    including the Icinga Agent with all components (like certificates) as well as
+    the Icinga for Windows service and the Icinga PowerShell Framework.
+.FUNCTIONALITY
+    Uninstalls every PowerShell module within the icinga-powershell-* namespace
+    including the Icinga Agent with all components (like certificates) as well as
+    the Icinga for Windows service and the Icinga PowerShell Framework.
+.PARAMETER Force
+    Suppress the question if you are sure to uninstall everything
+.INPUTS
+   System.String
+.OUTPUTS
+   Null
+.LINK
+   https://github.com/Icinga/icinga-powershell-framework
+#>
+
+function Uninstall-IcingaForWindows()
+{
+    param (
+        [switch]$Force = $FALSE
+    );
+
+    $ModuleList      = Get-Module 'icinga-powershell-*' -ListAvailable;
+    [string]$Modules = [string]::Join(', ', $ModuleList.Name);
+
+    if ($Force -eq $FALSE) {
+        Write-IcingaConsoleWarning -Message 'You are about to uninstall the Icinga Agent with all components (including certificates) and all Icinga for Windows Components: {0}{1}Are you sure you want to proceed? (y/N)' -Objects $Modules, (New-IcingaNewLine);
+        $Input = Read-Host 'Confirm uninstall';
+        if ($input -ne 'y') {
+            return;
+        }
+    }
+
+    $CurrentLocation = Get-Location;
+
+    if ($CurrentLocation -eq (Join-Path -Path (Get-IcingaFrameworkRootPath) -ChildPath 'icinga-powershell-framework')) {
+        Set-Location -Path (Get-IcingaFrameworkRootPath);
+    }
+
+    Write-IcingaConsoleNotice 'Uninstalling Icinga for Windows from this host';
+    Write-IcingaConsoleNotice 'Uninstalling Icinga Agent';
+    Uninstall-IcingaAgent -RemoveDataFolder | Out-Null;
+    Write-IcingaConsoleNotice 'Uninstalling Icinga for Windows service';
+    Uninstall-IcingaFrameworkService | Out-Null;
+
+    $HasErrors = $FALSE;
+
+    foreach ($module in $ModuleList.Name) {
+        [string]$ModuleName = $module.Replace('icinga-powershell-', '');
+
+        if ((Uninstall-IcingaFrameworkComponent -Component $ModuleName)) {
+            continue;
+        }
+
+        $HasErrors = $TRUE;
+    }
+
+    Remove-Module 'icinga-powershell-framework' -Force -ErrorAction SilentlyContinue;
+
+    if ($HasErrors) {
+        Write-IcingaConsoleWarning 'Not all components could be removed. Please ensure no other PowerShell/Application is currently open and accessing Icinga for Windows files';
+    } else {
+        Write-IcingaConsoleNotice 'Icinga for Windows was removed from this host.';
+    }
+}

lib/core/framework/Uninstall-IcingaFrameworkComponent.psm1

@@ -0,0 +1,48 @@
+<#
+.SYNOPSIS
+    Uninstalls a specific module within the icinga-powershell-* namespace
+    inside your PowerShell module folder
+.DESCRIPTION
+    Uninstalls a specific module within the icinga-powershell-* namespace
+    inside your PowerShell module folder
+.FUNCTIONALITY
+    Uninstalls a specific module within the icinga-powershell-* namespace
+    inside your PowerShell module folder
+.PARAMETER Component
+    The component you want to uninstall, like 'plugins' or 'mssql'
+.INPUTS
+   System.String
+.OUTPUTS
+   Null
+.LINK
+   https://github.com/Icinga/icinga-powershell-framework
+#>
+
+function Uninstall-IcingaFrameworkComponent()
+{
+    param (
+        [string]$Component
+    );
+
+    $ModuleBase         = Get-IcingaFrameworkRootPath;
+    $UninstallComponent = [string]::Format('icinga-powershell-{0}', $Component);
+    $UninstallPath      = Join-Path -Path $ModuleBase -ChildPath $UninstallComponent;
+
+    if ((Test-Path $UninstallPath) -eq $FALSE) {
+        Write-IcingaConsoleNotice -Message 'The Icinga for Windows component "{0}" at "{1}" could not ne found.' -Objects $UninstallComponent, $UninstallPath;
+        return $FALSE;
+    }
+
+    Write-IcingaConsoleNotice -Message 'Uninstalling Icinga for Windows component "{0}" from "{1}"' -Objects $UninstallComponent, $UninstallPath;
+    if (Remove-ItemSecure -Path $UninstallPath -Recurse -Force) {
+        Write-IcingaConsoleNotice -Message 'Successfully removed Icinga for Windows component "{0}" from "{1}"' -Objects $UninstallComponent, $UninstallPath;
+        if ($UninstallComponent -ne 'icinga-powershell-framework') {
+            Remove-Module $UninstallComponent -Force -ErrorAction SilentlyContinue;
+        }
+        return $TRUE;
+    } else {
+        Write-IcingaConsoleError -Message 'Unable to uninstall Icinga for Windows component "{0}" from "{1}"' -Objects $UninstallComponent, $UninstallPath;
+    }
+
+    return $FALSE;
+}