From 559732708e9e1b84166dc4e75d1f828898ec276f Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Tue, 14 Apr 2026 18:34:57 +0100
Subject: [PATCH 1/6] feat: add Dev Drive setup for Windows in CI workflow

---
 .github/workflows/dotnet.yml | 39 ++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 6f148680f3..6b07e4c9bb 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -40,6 +40,45 @@ jobs:
           docker-images: false
           swap-storage: false
 
+      - name: Create Dev Drive (Windows)
+        if: matrix.os == 'windows-latest'
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = 'Stop'
+          $vhdPath = 'C:\dev_drive.vhdx'
+
+          # Create and mount VHDX via Hyper-V PowerShell cmdlets (available on GH runners)
+          New-VHD -Path $vhdPath -SizeBytes 10GB -Dynamic | Out-Null
+          $disk = Mount-VHD -Path $vhdPath -PassThru | Get-Disk
+          $disk | Initialize-Disk -PassThru | Out-Null
+          $part = $disk | New-Partition -AssignDriveLetter -UseMaximumSize
+          $driveLetter = $part.DriveLetter
+
+          # Try native Dev Drive first (Windows Server 2025+ / 24H2+)
+          # Gives Defender performance mode, filter optimizations, and CoW block cloning
+          try {
+            $part | Format-Volume -DevDrive -Confirm:$false -Force | Out-Null
+            fsutil devdrv trust "${driveLetter}:"
+            Write-Host "Formatted ${driveLetter}: as Dev Drive (native)"
+          } catch {
+            # Fall back to plain ReFS on older Windows (e.g. Server 2022)
+            $part | Format-Volume -FileSystem ReFS -NewFileSystemLabel 'Build' -Confirm:$false -Force | Out-Null
+            Write-Host "Formatted ${driveLetter}: as ReFS (fallback)"
+          }
+
+          $refsBuildDir = "${driveLetter}:\workspace"
+          New-Item -Path $refsBuildDir -ItemType Directory -Force | Out-Null
+
+          # Junction the workspace so all subsequent steps transparently use the Dev Drive
+          Remove-Item -Path $env:GITHUB_WORKSPACE -Force -Recurse
+          cmd /c "mklink /J `"$env:GITHUB_WORKSPACE`" `"$refsBuildDir`""
+          Write-Host "Redirected $env:GITHUB_WORKSPACE -> $refsBuildDir"
+
+          # Redirect NuGet package cache to Dev Drive for faster restore/build
+          $nugetDir = "${driveLetter}:\.nuget\packages"
+          New-Item -Path $nugetDir -ItemType Directory -Force | Out-Null
+          "NUGET_PACKAGES=$nugetDir" >> $env:GITHUB_ENV
+
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0

From f9924cf226ccdf33fb6bf732d83f84d3b63e2548 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Tue, 14 Apr 2026 18:36:03 +0100
Subject: [PATCH 2/6] feat: streamline Dev Drive setup for Windows in CI
 workflow

---
 .github/workflows/dotnet.yml | 44 +++++++++++-------------------------
 1 file changed, 13 insertions(+), 31 deletions(-)

diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 6b07e4c9bb..be28ff5eda 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -40,45 +40,27 @@ jobs:
           docker-images: false
           swap-storage: false
 
-      - name: Create Dev Drive (Windows)
+      - name: Setup Dev Drive (Windows)
+        if: matrix.os == 'windows-latest'
+        uses: samypr100/setup-dev-drive@v4
+        with:
+          drive-size: 10GB
+          drive-type: Dynamic
+          trusted-dev-drive: true
+          env-mapping: |
+            NUGET_PACKAGES,{{ DEV_DRIVE }}/.nuget/packages
+
+      - name: Redirect workspace to Dev Drive (Windows)
         if: matrix.os == 'windows-latest'
         shell: pwsh
         run: |
-          $ErrorActionPreference = 'Stop'
-          $vhdPath = 'C:\dev_drive.vhdx'
-
-          # Create and mount VHDX via Hyper-V PowerShell cmdlets (available on GH runners)
-          New-VHD -Path $vhdPath -SizeBytes 10GB -Dynamic | Out-Null
-          $disk = Mount-VHD -Path $vhdPath -PassThru | Get-Disk
-          $disk | Initialize-Disk -PassThru | Out-Null
-          $part = $disk | New-Partition -AssignDriveLetter -UseMaximumSize
-          $driveLetter = $part.DriveLetter
-
-          # Try native Dev Drive first (Windows Server 2025+ / 24H2+)
-          # Gives Defender performance mode, filter optimizations, and CoW block cloning
-          try {
-            $part | Format-Volume -DevDrive -Confirm:$false -Force | Out-Null
-            fsutil devdrv trust "${driveLetter}:"
-            Write-Host "Formatted ${driveLetter}: as Dev Drive (native)"
-          } catch {
-            # Fall back to plain ReFS on older Windows (e.g. Server 2022)
-            $part | Format-Volume -FileSystem ReFS -NewFileSystemLabel 'Build' -Confirm:$false -Force | Out-Null
-            Write-Host "Formatted ${driveLetter}: as ReFS (fallback)"
-          }
-
-          $refsBuildDir = "${driveLetter}:\workspace"
+          $devDrive = $env:DEV_DRIVE
+          $refsBuildDir = "$devDrive\workspace"
           New-Item -Path $refsBuildDir -ItemType Directory -Force | Out-Null
-
-          # Junction the workspace so all subsequent steps transparently use the Dev Drive
           Remove-Item -Path $env:GITHUB_WORKSPACE -Force -Recurse
           cmd /c "mklink /J `"$env:GITHUB_WORKSPACE`" `"$refsBuildDir`""
           Write-Host "Redirected $env:GITHUB_WORKSPACE -> $refsBuildDir"
 
-          # Redirect NuGet package cache to Dev Drive for faster restore/build
-          $nugetDir = "${driveLetter}:\.nuget\packages"
-          New-Item -Path $nugetDir -ItemType Directory -Force | Out-Null
-          "NUGET_PACKAGES=$nugetDir" >> $env:GITHUB_ENV
-
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0

From b27fcc2cc0cd026ce38066e9ab5e6f268ebd9606 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Tue, 14 Apr 2026 18:40:08 +0100
Subject: [PATCH 3/6] feat: enhance workspace redirection for Dev Drive setup
 on Windows

---
 .github/workflows/dotnet.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index be28ff5eda..ebf9ea14e7 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -57,6 +57,8 @@ jobs:
           $devDrive = $env:DEV_DRIVE
           $refsBuildDir = "$devDrive\workspace"
           New-Item -Path $refsBuildDir -ItemType Directory -Force | Out-Null
+          # Move CWD away from workspace so the directory handle is released
+          Set-Location $devDrive
           Remove-Item -Path $env:GITHUB_WORKSPACE -Force -Recurse
           cmd /c "mklink /J `"$env:GITHUB_WORKSPACE`" `"$refsBuildDir`""
           Write-Host "Redirected $env:GITHUB_WORKSPACE -> $refsBuildDir"

From 1cbf98e03df9e9c413c4946c64333a2f387a772d Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Tue, 14 Apr 2026 18:48:29 +0100
Subject: [PATCH 4/6] feat: update Dev Drive setup for Windows by removing
 workspace redirection and adjusting cache paths

---
 .github/workflows/dotnet.yml | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index ebf9ea14e7..2da24a30e7 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -40,33 +40,19 @@ jobs:
           docker-images: false
           swap-storage: false
 
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
       - name: Setup Dev Drive (Windows)
         if: matrix.os == 'windows-latest'
         uses: samypr100/setup-dev-drive@v4
         with:
           drive-size: 10GB
-          drive-type: Dynamic
           trusted-dev-drive: true
           env-mapping: |
             NUGET_PACKAGES,{{ DEV_DRIVE }}/.nuget/packages
 
-      - name: Redirect workspace to Dev Drive (Windows)
-        if: matrix.os == 'windows-latest'
-        shell: pwsh
-        run: |
-          $devDrive = $env:DEV_DRIVE
-          $refsBuildDir = "$devDrive\workspace"
-          New-Item -Path $refsBuildDir -ItemType Directory -Force | Out-Null
-          # Move CWD away from workspace so the directory handle is released
-          Set-Location $devDrive
-          Remove-Item -Path $env:GITHUB_WORKSPACE -Force -Recurse
-          cmd /c "mklink /J `"$env:GITHUB_WORKSPACE`" `"$refsBuildDir`""
-          Write-Host "Redirected $env:GITHUB_WORKSPACE -> $refsBuildDir"
-
-      - uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-
       - name: Check for .received.txt files
         shell: bash
         run: |
@@ -100,10 +86,7 @@ jobs:
         uses: actions/cache@v5
         continue-on-error: true
         with:
-          path: |
-            ~/.nuget/packages
-            ~/.local/share/NuGet
-            %LocalAppData%\NuGet\v3-cache
+          path: ${{ env.NUGET_PACKAGES || '~/.nuget/packages' }}
           key: nuget-${{ runner.os }}-${{ hashFiles('**/Directory.Packages.props', '**/*.csproj') }}
           restore-keys: |
             nuget-${{ runner.os }}-

From 6cc81740a747a1a489bb7ab374892fd830cbc3f3 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Tue, 14 Apr 2026 18:58:56 +0100
Subject: [PATCH 5/6] feat: enhance Dev Drive setup for Windows by adding
 environment variables for NuGet packages and temporary files

---
 .github/workflows/dotnet.yml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 2da24a30e7..88b1158ea1 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -21,6 +21,8 @@ concurrency:
 jobs:
   modularpipeline:
     environment: ${{ github.ref == 'refs/heads/main' && 'Production' || 'Pull Requests' }}
+    env:
+      NUGET_PACKAGES: ~/.nuget/packages
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
@@ -52,6 +54,8 @@ jobs:
           trusted-dev-drive: true
           env-mapping: |
             NUGET_PACKAGES,{{ DEV_DRIVE }}/.nuget/packages
+            TEMP,{{ DEV_DRIVE }}/tmp
+            TMP,{{ DEV_DRIVE }}/tmp
 
       - name: Check for .received.txt files
         shell: bash
@@ -86,7 +90,10 @@ jobs:
         uses: actions/cache@v5
         continue-on-error: true
         with:
-          path: ${{ env.NUGET_PACKAGES || '~/.nuget/packages' }}
+          path: |
+            ${{ env.NUGET_PACKAGES }}
+            ~/.local/share/NuGet
+            %LocalAppData%\NuGet\v3-cache
           key: nuget-${{ runner.os }}-${{ hashFiles('**/Directory.Packages.props', '**/*.csproj') }}
           restore-keys: |
             nuget-${{ runner.os }}-

From a9ddf4c0d1155e811469406ac720a8b4a383c1b0 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Tue, 14 Apr 2026 19:09:04 +0100
Subject: [PATCH 6/6] feat: update Dev Drive setup for Windows by adjusting
 NuGet packages path handling

---
 .github/workflows/dotnet.yml | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 88b1158ea1..2f2abca08b 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -21,8 +21,6 @@ concurrency:
 jobs:
   modularpipeline:
     environment: ${{ github.ref == 'refs/heads/main' && 'Production' || 'Pull Requests' }}
-    env:
-      NUGET_PACKAGES: ~/.nuget/packages
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
@@ -91,7 +89,7 @@ jobs:
         continue-on-error: true
         with:
           path: |
-            ${{ env.NUGET_PACKAGES }}
+            ${{ env.NUGET_PACKAGES || '~/.nuget/packages' }}
             ~/.local/share/NuGet
             %LocalAppData%\NuGet\v3-cache
           key: nuget-${{ runner.os }}-${{ hashFiles('**/Directory.Packages.props', '**/*.csproj') }}