Fix up init.cmd to set env vars from .ps1 child process

azure-pipelines/Set-EnvVars.ps1

@@ -4,8 +4,13 @@
     Azure Pipeline and CMD environments are considered.
 .PARAMETER Variables
     A hashtable of variables to be set.
+.PARAMETER PrependPath
+    A set of paths to prepend to the PATH environment variable.
 .OUTPUTS
     A boolean indicating whether the environment variables can be expected to propagate to the caller's environment.
+.DESCRIPTION
+    The CmdEnvScriptPath environment variable may be optionally set to a path to a cmd shell script to be created (or appended to if it already exists) that will set the environment variables in cmd.exe that are set within the PowerShell environment.
+    This is used by init.cmd in order to reapply any new environment variables to the parent cmd.exe process that were set in the powershell child process.
 #>
 [CmdletBinding(SupportsShouldProcess=$true)]
 Param(
@@ -18,7 +23,7 @@ if ($Variables.Count -eq 0) {
     return $true
 }
 
-$cmdInstructions = !$env:TF_BUILD -and !$env:GITHUB_ACTIONS -and $env:PS1UnderCmd -eq '1'
+$cmdInstructions = !$env:TF_BUILD -and !$env:GITHUB_ACTIONS -and !$env:CmdEnvScriptPath -and ($env:PS1UnderCmd -eq '1')
 if ($cmdInstructions) {
     Write-Warning "Environment variables have been set that will be lost because you're running under cmd.exe"
     Write-Host "Environment variables that must be set manually:" -ForegroundColor Blue
@@ -38,6 +43,7 @@ if ($env:GITHUB_ACTIONS) {
     Write-Host "GitHub Actions detected. Logging commands will be used to propagate environment variables and prepend path."
 }
 
+$CmdEnvScript = ''
 $Variables.GetEnumerator() |% {
     Set-Item -Path env:$($_.Key) -Value $_.Value
 
@@ -52,6 +58,8 @@ $Variables.GetEnumerator() |% {
     if ($cmdInstructions) {
         Write-Host "SET $($_.Key)=$($_.Value)"
     }
+
+    $CmdEnvScript += "SET $($_.Key)=$($_.Value)`r`n"
 }
 
 $pathDelimiter = ';'
@@ -73,7 +81,17 @@ if ($PrependPath) {
         if ($env:GITHUB_ACTIONS) {
             Write-Host "::add-path::$_"
         }
+
+        $CmdEnvScript += "SET PATH=$_$pathDelimiter%PATH%"
     }
 }
 
+if ($env:CmdEnvScriptPath) {
+    if (Test-Path $env:CmdEnvScriptPath) {
+        $CmdEnvScript = (Get-Content -Path $env:CmdEnvScriptPath) + $CmdEnvScript
+    }
+
+    Set-Content -Path $env:CmdEnvScriptPath -Value $CmdEnvScript
+}
+
 return !$cmdInstructions

init.cmd

@@ -1,4 +1,20 @@
 @echo off
 SETLOCAL
 set PS1UnderCmd=1
+
+:: Get the datetime in a format that can go in a filename.
+set _my_datetime=%date%_%time%
+set _my_datetime=%_my_datetime: =_%
+set _my_datetime=%_my_datetime::=%
+set _my_datetime=%_my_datetime:/=_%
+set _my_datetime=%_my_datetime:.=_%
+set CmdEnvScriptPath=%temp%\envvarscript_%_my_datetime%.cmd
+
 powershell.exe -NoProfile -NoLogo -ExecutionPolicy bypass -Command "try { & '%~dpn0.ps1' %*; exit $LASTEXITCODE } catch { write-host $_; exit 1 }"
+
+:: Set environment variables in the parent cmd.exe process.
+IF EXIST "%CmdEnvScriptPath%" (
+    ENDLOCAL
+    CALL "%CmdEnvScriptPath%"
+    DEL "%CmdEnvScriptPath%"
+)

init.ps1

@@ -2,28 +2,31 @@
 
 <#
 .SYNOPSIS
-Installs dependencies required to build and test the projects in this repository.
+    Installs dependencies required to build and test the projects in this repository.
 .DESCRIPTION
-This MAY not require elevation, as the SDK and runtimes are installed to a per-user location,
-unless the `-InstallLocality` switch is specified directing to a per-repo or per-machine location.
-See detailed help on that switch for more information.
+    This MAY not require elevation, as the SDK and runtimes are installed to a per-user location,
+    unless the `-InstallLocality` switch is specified directing to a per-repo or per-machine location.
+    See detailed help on that switch for more information.
+
+    The CmdEnvScriptPath environment variable may be optionally set to a path to a cmd shell script to be created (or appended to if it already exists) that will set the environment variables in cmd.exe that are set within the PowerShell environment.
+    This is used by init.cmd in order to reapply any new environment variables to the parent cmd.exe process that were set in the powershell child process.
 .PARAMETER InstallLocality
-A value indicating whether dependencies should be installed locally to the repo or at a per-user location.
-Per-user allows sharing the installed dependencies across repositories and allows use of a shared expanded package cache.
-Visual Studio will only notice and use these SDKs/runtimes if VS is launched from the environment that runs this script.
-Per-repo allows for high isolation, allowing for a more precise recreation of the environment within an Azure Pipelines build.
-When using 'repo', environment variables are set to cause the locally installed dotnet SDK to be used.
-Per-repo can lead to file locking issues when dotnet.exe is left running as a build server and can be mitigated by running `dotnet build-server shutdown`.
-Per-machine requires elevation and will download and install all SDKs and runtimes to machine-wide locations so all applications can find it.
+    A value indicating whether dependencies should be installed locally to the repo or at a per-user location.
+    Per-user allows sharing the installed dependencies across repositories and allows use of a shared expanded package cache.
+    Visual Studio will only notice and use these SDKs/runtimes if VS is launched from the environment that runs this script.
+    Per-repo allows for high isolation, allowing for a more precise recreation of the environment within an Azure Pipelines build.
+    When using 'repo', environment variables are set to cause the locally installed dotnet SDK to be used.
+    Per-repo can lead to file locking issues when dotnet.exe is left running as a build server and can be mitigated by running `dotnet build-server shutdown`.
+    Per-machine requires elevation and will download and install all SDKs and runtimes to machine-wide locations so all applications can find it.
 .PARAMETER NoPrerequisites
-Skips the installation of prerequisite software (e.g. SDKs, tools).
+    Skips the installation of prerequisite software (e.g. SDKs, tools).
 .PARAMETER UpgradePrerequisites
-Takes time to install prerequisites even if they are already present in case they need to be upgraded.
-No effect if -NoPrerequisites is specified.
+    Takes time to install prerequisites even if they are already present in case they need to be upgraded.
+    No effect if -NoPrerequisites is specified.
 .PARAMETER NoRestore
-Skips the package restore step.
+    Skips the package restore step.
 .PARAMETER AccessToken
-An optional access token for authenticating to Azure Artifacts authenticated feeds.
+    An optional access token for authenticating to Azure Artifacts authenticated feeds.
 #>
 [CmdletBinding(SupportsShouldProcess=$true)]
 Param (

tools/Install-DotNetSdk.ps1

@@ -2,19 +2,19 @@
 
 <#
 .SYNOPSIS
-Installs the .NET SDK specified in the global.json file at the root of this repository,
-along with supporting .NET Core runtimes used for testing.
+    Installs the .NET SDK specified in the global.json file at the root of this repository,
+    along with supporting .NET Core runtimes used for testing.
 .DESCRIPTION
-This MAY not require elevation, as the SDK and runtimes are installed locally to this repo location,
-unless `-InstallLocality machine` is specified.
+    This MAY not require elevation, as the SDK and runtimes are installed locally to this repo location,
+    unless `-InstallLocality machine` is specified.
 .PARAMETER InstallLocality
-A value indicating whether dependencies should be installed locally to the repo or at a per-user location.
-Per-user allows sharing the installed dependencies across repositories and allows use of a shared expanded package cache.
-Visual Studio will only notice and use these SDKs/runtimes if VS is launched from the environment that runs this script.
-Per-repo allows for high isolation, allowing for a more precise recreation of the environment within an Azure Pipelines build.
-When using 'repo', environment variables are set to cause the locally installed dotnet SDK to be used.
-Per-repo can lead to file locking issues when dotnet.exe is left running as a build server and can be mitigated by running `dotnet build-server shutdown`.
-Per-machine requires elevation and will download and install all SDKs and runtimes to machine-wide locations so all applications can find it.
+    A value indicating whether dependencies should be installed locally to the repo or at a per-user location.
+    Per-user allows sharing the installed dependencies across repositories and allows use of a shared expanded package cache.
+    Visual Studio will only notice and use these SDKs/runtimes if VS is launched from the environment that runs this script.
+    Per-repo allows for high isolation, allowing for a more precise recreation of the environment within an Azure Pipelines build.
+    When using 'repo', environment variables are set to cause the locally installed dotnet SDK to be used.
+    Per-repo can lead to file locking issues when dotnet.exe is left running as a build server and can be mitigated by running `dotnet build-server shutdown`.
+    Per-machine requires elevation and will download and install all SDKs and runtimes to machine-wide locations so all applications can find it.
 #>
 [CmdletBinding(SupportsShouldProcess=$true,ConfirmImpact='Medium')]
 Param (