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About80Ninjas

Jan 8th, 2016

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<#
.Synopsis
Gathers hotfixes for all computers in a list then returns a list of hotfixes that are only installed on some of the nodes.
.DESCRIPTION
Given a list of computers, this cmdlet verifies each computer is reachable and then gathers a list of hotfixes installed on each computer. It will then either display a table of all hotfixes
that are only installed on a subset of the computers specified or, if the DisplayAllHotfixes switch is specified, a table of all hotfixes installed on all computers. The first column
is the HotfixID and each other column (property) is the computer name; if the hotfix is installed on that computer it's marked "True", if not it's marked "False".
.EXAMPLE
$computerlist = @("ServerA", "ServerB", "ServerC")
Get-HotfixDiscrepancyReport -ComputerList $serverlist
Generates a hotfix report for three servers.
.EXAMPLE
Get-HotfixDiscrepancyReport -Computerlist ComputerA, ComputerB, ComputerC -DisplayAllHotfixes | Export-CSV .\hfreport.csv
Lists all hotfixes and whether or not they're installed for three computers and exports the list to a CSV file.
#>
function Get-HotfixDiscrepancyReport
{
[CmdletBinding()]
[OutputType([PSObject[]])]
Param
(
# A list of computers - can be an array variable or a comma delimited list of computers
[Parameter(Mandatory=$true,
ValueFromPipeline=$true,
Position=0)]
[Array]$ComputerList,
# If you want to display all hotfixes instead of just hotfixes that aren't installed on every computer
[Switch]$DisplayAllHotfixes
)
Process
{
Write-Verbose ("Verifying computer list")
$VerifiedComputers = @()
foreach ($computer in $ComputerList)
{
if(Test-Connection $computer -Count 1 -ErrorAction SilentlyContinue)
{
$VerifiedComputers += $computer
}
else
{
Write-Verbose ("$computer failed ping; skipping")
}
}
If ($VerifiedComputers.Count -lt 2)
{
Write-Error -Message "Not enough computers to generate a report. If your initial list had more than one computer, enable verbose mode to see which computers are failing."
return
}
[hashtable]$InstalledHotfixes = @{}
Write-Verbose ("Getting hotfixes for " + $VerifiedComputers[0])
Get-WmiObject Win32_QuickFixEngineering -Computername $VerifiedComputers[0] | % {
$InstalledHotfixes.Add($_.HotfixId, @($VerifiedComputers[0]))
}
for ($i = 1; $i -lt $VerifiedComputers.Count; $i++)
{
Write-Verbose ("Getting hotfixes for " + $VerifiedComputers[$i])
Get-WmiObject Win32_QuickFixEngineering -ComputerName $VerifiedComputers[$i] | % {
if ($InstalledHotfixes.ContainsKey($_.HotfixID))
{
$InstalledHotfixes.Set_Item($_.HotfixID,($InstalledHotfixes.Get_Item($_.HotfixId) + $VerifiedComputers[$i]))
}
else
{
$InstalledHotfixes.Add($_.HotfixId, @($VerifiedComputers[$i]))
}
}
}
if (!$DisplayAllHotfixes)
{
Write-Verbose ("Filtering list to only hotfixes not on all nodes")
$NewHfList = @{}
$InstalledHotfixes.GetEnumerator() | % {if ($_.Value.Count -lt $VerifiedComputers.count) {$NewHfList.Add($_.Key,$_.Value)}}
}
else
{
$NewHfList = $InstalledHotfixes
}
$hfdiscrepancylist = @()
Write-Verbose ("Creating hotfix list")
$NewHfList.GetEnumerator() | % {
$hfditem = "" | Select HotfixID
$hfditem.HotfixID = $_.Key
foreach ($computer in $VerifiedComputers)
{
$hfditem | Add-Member -NotePropertyName $computer -NotePropertyValue ([boolean]($_.Value -contains $computer))
}
$hfdiscrepancylist += $hfditem
}
return $hfdiscrepancylist | Sort-Object HotfixID
}
}

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