Return the deserialized object when CIM classes cannot be rehydrated by Nova-Logic · Pull Request #28192 · PowerShell/PowerShell · GitHub
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Return the deserialized object when CIM classes cannot be rehydrated #28192

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Return the deserialized object when CIM classes cannot be rehydrated #28192

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0c41b87
Return the deserialized object when CIM classes cannot be rehydrated
Nova-Logic Oct 12, 2026
f2033dd
Hide the CIM metadata of instances that cannot be rehydrated
Nova-Logic Oct 14, 2026
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65 changes: 61 additions & 4 deletions src/System.Management.Automation/engine/serialization.cs
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27 changes: 27 additions & 0 deletions test/powershell/engine/Api/Serialization.Tests.ps1
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Original file line number Diff line number Diff line change
Expand Up @@ -102,4 +102,31 @@ Describe "Serialization Tests" -tags "CI" {

SerializeAndDeserialize($versionObject).TestScriptProperty | Should -Be $versionObject.TestScriptProperty
}

It 'Deserializes a CIM instance whether or not its CIM class can be rehydrated' {
# Serialized on Windows with class metadata (__ClassMetadata/MiXml). Where the native MI library is
# available the object is rehydrated into a CimInstance; where it is not (e.g. macOS) the deserialized
# property bag must be returned instead of failing the whole deserialization.
$xml = Get-Content -Raw -Path (Join-Path $PSScriptRoot 'assets' 'CimInstance-Win32_TimeZone.clixml')

$result = [System.Management.Automation.PSSerializer]::Deserialize($xml)

$result.Bias | Should -Be 180
$result.Caption | Should -Not -BeNullOrEmpty
$result.PSTypeNames -match 'Win32_TimeZone' | Should -Not -BeNullOrEmpty
}

It 'Keeps the CIM metadata of a deserialized CIM instance hidden but serializable' {
# The serialization metadata must not show up as properties of the object, but serializing the object
# again must still carry it so that a receiver able to rehydrate CIM instances gets a CimInstance.
$xml = Get-Content -Raw -Path (Join-Path $PSScriptRoot 'assets' 'CimInstance-Win32_TimeZone.clixml')
$result = [System.Management.Automation.PSSerializer]::Deserialize($xml)

($result | Select-Object -Property *).PSObject.Properties.Name | Should -Not -Contain '__ClassMetadata'
($result | Format-List -Property * | Out-String) | Should -Not -Match '__ClassMetadata'

$roundTrip = [System.Management.Automation.PSSerializer]::Serialize($result, 1)
$roundTrip | Should -Match '__ClassMetadata'
([System.Management.Automation.PSSerializer]::Deserialize($roundTrip)).Bias | Should -Be 180
}
}
68 changes: 68 additions & 0 deletions test/powershell/engine/Api/assets/CimInstance-Win32_TimeZone.clixml
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