Make UnsupportedOSError more user-friendly (#192)

* Make UnsupportedOSError more user-friendly * tart prune: allow only specifying a --gc flag
cirruslabs · Aug 24, 2022 · 195a4b3 · 195a4b3
1 parent 59393df
commit 195a4b3
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/Sources/tart/Commands/Prune.swift b/Sources/tart/Commands/Prune.swift
@@ -20,8 +20,8 @@ struct Prune: AsyncParsableCommand {
   var gc: Bool = false
 
   func validate() throws {
-    if olderThan == nil && cacheBudget == nil {
-      throw ValidationError("at least one criteria must be specified")
+    if olderThan == nil && cacheBudget == nil && !gc {
+      throw ValidationError("at least one pruning criteria must be specified")
     }
   }
 

diff --git a/Sources/tart/VM.swift b/Sources/tart/VM.swift
@@ -10,7 +10,8 @@ struct NoMainScreenFoundError: Error {
 struct DownloadFailed: Error {
 }
 
-struct UnsupportedOSError: Error {
+struct UnsupportedOSError: Error, CustomStringConvertible {
+  private(set) var description: String = "error: Linux VMs are only supported on macOS 13.0 (Ventura) or newer"
 }
 
 struct UnsupportedArchitectureError: Error {