Chocolatey packaging script (chocolateyBeforeModify.ps1) incorrectly running on non-Windows platforms

[TheCakeIsNaOH]

What You Are Seeing?

beforemodify scripts are still running during upgrades and uninstall on non-windows platforms.
Also, during uninstall, the automatic uninstaller and shimgen services are still running, while on the install/upgrade phase they are not running.

What is Expected?

The before modify scripts should not attempt to run on non-windows platforms.

How Did You Get This To Happen? (Steps to Reproduce)

1. Build choco and run integration tests on non-windows
2. Remove the upgradepackage install
3. Run choco install --version=1.0.0 -s ./context upgradepackage
4. Run choco upgrade -s ./context upgradepackage (or uninstall)

See this comment as well: #2434 (comment)

Output Log

Full Log Output

mono choco.exe uninstall --allow-unofficial --verbose --debug upgradepackage                         Chocolatey v0.11.3-108-g4c320478
Chocolatey is running on Linux v 5.14.0.0
Attempting to delete file "/path/choco/build_output/chocolatey/chocolatey.dll.old".
Attempting to delete file "/path/choco/build_output/chocolatey/choco.exe.old".
Command line: /path/choco/build_output/chocolatey/choco.exe uninstall --allow-unofficial --verbose --debug upgradepackage
Received arguments: uninstall --allow-unofficial --verbose --debug upgradepackage
RemovePendingPackagesTask is now ready and waiting for PreRunMessage.
Sending message 'PreRunMessage' out if there are subscribers...
[Pending] Removing all pending packages that should not be considered installed...
Performing validation checks.
Global Configuration Validation Checks:
 - Package Exit Code / Exit On Reboot = Checked
System State Validation Checks:
The source 'https://community.chocolatey.org/api/v2/' evaluated to a 'normal' source type

NOTE: Hiding sensitive configuration data! Please double and triple
 check to be sure no sensitive data is shown, especially if copying
 output to a gist for review.
Configuration: CommandName='uninstall'|CacheLocation='/tmp/chocolatey'|
ContainsLegacyPackageInstalls='True'|
CommandExecutionTimeoutSeconds='2700'|WebRequestTimeoutSeconds='30'|
Sources='https://community.chocolatey.org/api/v2/'|SourceType='normal'|
Debug='True'|Verbose='True'|Trace='False'|Force='False'|Noop='False'|
HelpRequested='False'|UnsuccessfulParsing='False'|RegularOutput='True'|
QuietOutput='False'|PromptForConfirmation='True'|AcceptLicense='False'|
AllowUnofficialBuild='True'|Input='upgradepackage'|AllVersions='False'|
SkipPackageInstallProvider='False'|PackageNames='upgradepackage'|
Prerelease='False'|ForceX86='False'|OverrideArguments='False'|
NotSilent='False'|ApplyPackageParametersToDependencies='False'|
ApplyInstallArgumentsToDependencies='False'|IgnoreDependencies='False'|
AllowMultipleVersions='False'|AllowDowngrade='False'|
ForceDependencies='False'|Information.PlatformType='Linux'|
Information.PlatformVersion='5.14.0.0'|
Information.PlatformName='Linux'|
Information.ChocolateyVersion='0.12.0.0'|
Information.ChocolateyProductVersion='0.11.3-108-g4c320478'|
Information.FullName='chocolatey, Version=0.12.0.0, Culture=neutral, PublicKeyToken=fd112f53c3ab578c'|

Information.Is64BitOperatingSystem='True'|
Information.Is64BitProcess='True'|Information.IsInteractive='False'|
Information.UserName='user'|Information.UserDomainName='system'|
Information.IsUserAdministrator='False'|
Information.IsUserSystemAccount='False'|
Information.IsUserRemoteDesktop='False'|
Information.IsUserRemote='True'|
Information.IsProcessElevated='False'|
Information.IsLicensedVersion='False'|Information.LicenseType='Foss'|
Information.CurrentDirectory='/path/choco/build_output/chocolatey'|

Features.AutoUninstaller='True'|Features.ChecksumFiles='True'|
Features.AllowEmptyChecksums='False'|
Features.AllowEmptyChecksumsSecure='True'|
Features.FailOnAutoUninstaller='False'|
Features.FailOnStandardError='False'|Features.UsePowerShellHost='True'|
Features.LogEnvironmentValues='False'|Features.LogWithoutColor='False'|
Features.VirusCheck='False'|
Features.FailOnInvalidOrMissingLicense='False'|
Features.IgnoreInvalidOptionsSwitches='True'|
Features.UsePackageExitCodes='True'|
Features.UseEnhancedExitCodes='False'|
Features.UseFipsCompliantChecksums='False'|
Features.ShowNonElevatedWarnings='True'|
Features.ShowDownloadProgress='True'|
Features.StopOnFirstPackageFailure='False'|
Features.UseRememberedArgumentsForUpgrades='False'|
Features.IgnoreUnfoundPackagesOnUpgradeOutdated='False'|
Features.SkipPackageUpgradesWhenNotInstalled='False'|
Features.RemovePackageInformationOnUninstall='False'|
Features.ExitOnRebootDetected='False'|
Features.LogValidationResultsOnWarnings='True'|
Features.UsePackageRepositoryOptimizations='True'|
Features.ScriptsCheckLastExitCode='False'|
ListCommand.LocalOnly='False'|
ListCommand.IdOnly='False'|ListCommand.IncludeRegistryPrograms='False'|
ListCommand.PageSize='25'|ListCommand.Exact='False'|
ListCommand.ByIdOnly='False'|ListCommand.ByTagOnly='False'|
ListCommand.IdStartsWith='False'|ListCommand.OrderByPopularity='False'|
ListCommand.ApprovedOnly='False'|
ListCommand.DownloadCacheAvailable='False'|
ListCommand.NotBroken='False'|
ListCommand.IncludeVersionOverrides='False'|
UpgradeCommand.FailOnUnfound='False'|
UpgradeCommand.FailOnNotInstalled='False'|
UpgradeCommand.NotifyOnlyAvailableUpgrades='False'|
UpgradeCommand.ExcludePrerelease='False'|
NewCommand.AutomaticPackage='False'|
NewCommand.UseOriginalTemplate='False'|SourceCommand.Command='unknown'|
SourceCommand.Priority='0'|SourceCommand.BypassProxy='False'|
SourceCommand.AllowSelfService='False'|
SourceCommand.VisibleToAdminsOnly='False'|
FeatureCommand.Command='unknown'|ConfigCommand.Command='unknown'|
ApiKeyCommand.Remove='False'|PinCommand.Command='unknown'|
OutdatedCommand.IgnorePinned='False'|
ExportCommand.IncludeVersionNumbers='False'|Proxy.BypassOnLocal='True'|

Chocolatey is not an official build (bypassed with --allow-unofficial).
 If you are seeing this message and it is not expected, your system may
 now be in a bad state. Only official builds are to be trusted.

_ Chocolatey:ChocolateyUninstallCommand - Normal Run Mode _
Uninstalling the following packages:
upgradepackage
Running list with the following filter = ''
--- Start of List ---
upgradepackage 1.1.0
badpackage 1.0
installpackage 1.0.0
--- End of List ---
Unable to determine current user to determine if LocalSystem account (to skip user env vars).
 Reported error: The method or operation is not implemented.
Setting installer args for upgradepackage
Setting package parameters for upgradepackage
Contents of '/path/choco/build_output/chocolatey/lib/upgradepackage/tools/chocolateyBeforeModify.ps1':
Write-Output "$env:PackageName $env:PackageVersion Before Modification"
The package upgradepackage wants to run 'chocolateyBeforeModify.ps1'.
Note: If you don't run this script, the installation will fail.
Note: To confirm automatically next time, use '-y' or consider:
choco feature enable -n allowGlobalConfirmation
Do you want to run the script?([Y]es/[A]ll - yes to all/[N]o/[P]rint):