fix(shorebird_cli): print shorebird checkout output on windows, verify longpaths (#2710)

bin/shorebird.ps1

@@ -23,12 +23,12 @@ $dart = [IO.Path]::Combine($flutterPath, "bin", "cache", "dart-sdk", "bin", "dar
 # This is fixed in Powershell 7.1.
 # 
 # See https://github.com/PowerShell/PowerShell/issues/4002 for more info.
-function Invoke-SilentlyIfPossible($command) {
+function Invoke-SilentlyIfNeeded($command) {
     $psVersion = $PSVersionTable.PSVersion
-    $shouldRedirectStdErr = $psVersion.Major -ge 7 -and $psVersion.Minor -ge 1
-    if ($shouldRedirectStdErr) {
-        # Redirect everything to $null.
-        & $command *> $null
+    $isErrorStreamIssueFixed = $psVersion.Major -ge 7 -and $psVersion.Minor -ge 1
+    if ($isErrorStreamIssueFixed) {
+        # Execute the command with no redirection.
+        & $command
     }
     else {
         # Otherwise redirect everything _but_ the Error stream to $null. See
@@ -38,6 +38,13 @@ function Invoke-SilentlyIfPossible($command) {
     }
 }
 
+function Test-GitConfigLongpaths {
+    $longpathsEnabled = git config --system core.longpaths
+    if ($longpathsEnabled -ne "true") {
+        Write-Output "Git is not configured to allow long paths. This can cause issues with Shorebird's Flutter checkout. Please run 'git config --system core.longpaths true' to enable long paths."
+    }
+}
+
 function Test-GitInstalled {
     if (Get-Command git -ErrorAction SilentlyContinue) {
         Write-Debug "Git is installed."
@@ -100,17 +107,17 @@ function Update-Flutter {
     Write-Output "Updating Flutter..."
 
     if (!(Test-Path $flutterPath)) {
-        Invoke-SilentlyIfPossible {
+        Invoke-SilentlyIfNeeded {
             git clone --filter=tree:0 https://github.com/shorebirdtech/flutter.git --no-checkout "$flutterPath" 
         }
     }
     else {
-        Invoke-SilentlyIfPossible {
+        Invoke-SilentlyIfNeeded {
             git -C "$flutterPath" fetch
         }
     }
 
-    Invoke-SilentlyIfPossible {
+    Invoke-SilentlyIfNeeded {
         # -c to avoid printing a warning about being in a detached head state.
         git -C "$flutterPath" -c advice.detachedHead=false checkout "$flutterVersion"
     }
@@ -152,6 +159,8 @@ function Update-Shorebird {
 
 Test-GitInstalled
 
+Test-GitConfigLongpaths
+
 if (Test-ShorebirdNeedsUpdate) {
     Update-Shorebird
 }

cspell.config.yaml

@@ -63,6 +63,7 @@ words:
   - libplist
   - lldb
   - logcat
+  - longpaths
   - lproj
   - metadatas
   - mktemp