tart clone: cap automatic pruning at 100 GB (#1124)

* ASIF is available only starting from macOS 26 (Tahoe)

* Remove testRawFormatIsAlwaysSupported() test

* Fix testASIFFormatSupport() test to check for macOS 26+

Sources/tart/Commands/Clone.swift

@@ -76,8 +76,10 @@ struct Clone: AsyncParsableCommand {
       //
       // So, once we clone the VM let's try to claim the rest of space for the VM to run without errors.
       let unallocatedBytes = try sourceVM.sizeBytes() - sourceVM.allocatedSizeBytes()
-      if unallocatedBytes > 0 {
-        try Prune.reclaimIfNeeded(UInt64(unallocatedBytes), sourceVM)
+      // Avoid reclaiming an excessive amount of disk space.
+      let reclaimBytes = min(unallocatedBytes, 100 * 1024 * 1024 * 1024)
+      if reclaimBytes > 0 {
+        try Prune.reclaimIfNeeded(UInt64(reclaimBytes), sourceVM)
       }
     }, onCancel: {
       try? FileManager.default.removeItem(at: tmpVMDir.baseURL)

Sources/tart/Commands/Exec.swift

@@ -87,11 +87,13 @@ struct Exec: AsyncParsableCommand {
         $0.args = Array(command.dropFirst(1))
         $0.interactive = interactive
         $0.tty = tty
-        $0.terminalSize = .with {
-          let (width, height) = try! Term.GetSize()
+        if tty {
+          $0.terminalSize = .with {
+            let (width, height) = try! Term.GetSize()
 
-          $0.cols = UInt32(width)
-          $0.rows = UInt32(height)
+            $0.cols = UInt32(width)
+            $0.rows = UInt32(height)
+          }
         }
       })
     })

Sources/tart/DiskImageFormat.swift

@@ -21,7 +21,7 @@ enum DiskImageFormat: String, CaseIterable, Codable {
     case .raw:
       return true
     case .asif:
-      if #available(macOS 15, *) {
+      if #available(macOS 26, *) {
         return true
       } else {
         return false

Tests/TartTests/DiskImageFormatTests.swift

@@ -2,13 +2,9 @@ import XCTest
 @testable import tart
 
 final class DiskImageFormatTests: XCTestCase {
-  func testRawFormatIsAlwaysSupported() throws {
-    XCTAssertTrue(DiskImageFormat.raw.isSupported)
-  }
-
   func testASIFFormatSupport() throws {
-    // ASIF should be supported on macOS 15+
-    if #available(macOS 15, *) {
+    // ASIF should be supported on macOS 26+
+    if #available(macOS 26, *) {
       XCTAssertTrue(DiskImageFormat.asif.isSupported)
     } else {
       XCTAssertFalse(DiskImageFormat.asif.isSupported)