mirror of
https://github.com/microsoft/vcpkg.git
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53 lines
2.3 KiB
PowerShell
53 lines
2.3 KiB
PowerShell
# Capture environment variables for the System and User. Also add some special/built-in variables.
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# These will be used to synthesize a clean environment
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$specialEnvironmentMap = @{ "SystemDrive"=$env:SystemDrive; "SystemRoot"=$env:SystemRoot; "UserProfile"=$env:UserProfile; "TMP"=$env:TMP } # These are built-in and not set in the registry
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$machineEnvironmentMap = [Environment]::GetEnvironmentVariables('Machine') # HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
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$userEnvironmentMap = [Environment]::GetEnvironmentVariables('User') # HKEY_CURRENT_USER\Environment
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# Identify the keySet of environment variable names
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$nameSet = ($specialEnvironmentMap.Keys + $machineEnvironmentMap.Keys + $userEnvironmentMap.Keys) | Sort-Object | Select-Object -Unique
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# Any environment variable in the $nameSet should be restored to its original value
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foreach ($name in $nameSet)
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{
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if ($specialEnvironmentMap.ContainsKey($name))
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{
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[Environment]::SetEnvironmentVariable($name, $specialEnvironmentMap[$name], 'Process')
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continue;
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}
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# PATH needs to be concatenated as it has values in both machine and user environment. Any other values should be set.
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if ($name -eq 'path')
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{
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$pathValuePartial = @()
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# Machine values before user values
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$pathValuePartial += $machineEnvironmentMap[$name] -split ';'
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$pathValuePartial += $userEnvironmentMap[$name] -split ';'
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$pathValue = $pathValuePartial -join ';'
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[Environment]::SetEnvironmentVariable($name, $pathValue, 'Process')
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continue;
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}
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if ($userEnvironmentMap.ContainsKey($name))
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{
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[Environment]::SetEnvironmentVariable($name, $userEnvironmentMap[$name], 'Process')
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continue;
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}
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if ($machineEnvironmentMap.ContainsKey($name))
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{
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[Environment]::SetEnvironmentVariable($name, $machineEnvironmentMap[$name], 'Process')
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continue;
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}
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throw "Unreachable: Unknown variable $name"
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}
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# Any environment variable NOT in the $nameSet should be removed
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$processEnvironmentMap = [Environment]::GetEnvironmentVariables('Process')
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$variablesForRemoval = $processEnvironmentMap.Keys | Where-Object {$nameSet -notcontains $_}
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foreach ($name in $variablesForRemoval)
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{
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[Environment]::SetEnvironmentVariable($name, $null, 'Process')
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}
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