Windows: download the latest adb on demand

backup-windows.ps1

@@ -9,19 +9,43 @@ Write-Output ""
 pause
 # Corrects the cwd if it's different than the script directory
 Set-Location -Path $PSScriptRoot
+# Ask the user if they want to download the latest ADB platform tools from Google
+# This is done to always have the latest version and lessen the incentive to slip in malware into the repository while still respecting the user's privacy
+# On Linux and macOS adb is managed by the package manager.
+$downloadAdb = Read-Host "Do you want to download the latest dependencies (adb)? This will connect you to Google's servers. You can safely decline. (y/n)"
+if ($downloadAdb.ToLower().StartsWith("y")) {
+    # Delete ./windows-dependencies/adb/ if it exists
+    if (Test-Path ./windows-dependencies/adb) {
+        Remove-Item -Recurse -Force ./windows-dependencies/adb
+    }
+    # Download the latest adb platform tools from Google
+    Write-Output "Downloading the latest ADB platform tools..."
+    Invoke-WebRequest -Uri "https://dl.google.com/android/repository/platform-tools-latest-windows.zip" -OutFile "./windows-dependencies/platform-tools-latest-windows.zip"
+    # Extract the downloaded zip
+    Write-Output "Extracting..."
+    Expand-Archive -Path "./windows-dependencies/platform-tools-latest-windows.zip" -DestinationPath "./windows-dependencies"
+    # Rename the extracted folder to 'adb'
+    Rename-Item -Path "./windows-dependencies/platform-tools" -NewName "./windows-dependencies/adb"
+    # Remove the downloaded zip
+    Remove-Item -Path "./windows-dependencies/platform-tools-latest-windows.zip"
+}
+# Update WSL to avoid compatibility issues
 Write-Output "Updating WSL..."
 wsl --update
 wsl --shutdown
 wsl sudo apt update
 wsl sudo apt dist-upgrade -y
+# Install everything we need
 Write-Output "Installing dependencies and setting up environment..."
 wsl sudo apt install p7zip-full secure-delete whiptail curl dos2unix pv bc zenity '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev -y
+# Convert line endings to Unix format, as what Windows uses by default may cause issues
 Write-Output "Converting files - this may take several minutes..."
 wsl bash -c "sudo find ./ -name '*.sh' -type f -print0 | sudo xargs -0 dos2unix --"
 Clear-Host
 Write-Output "Ready to run the backup script."
 pause
 Clear-Host
+# Run the 'bootstrapper' script which configures the main script to use the Windows-provided adb.exe
 wsl ./windows-dependencies/env-startup.sh
 Write-Output Exiting.
 pause