Nucleic: Gitea Runner macOS VM Support

Sources/RunnerHost/Doctor.swift

@@ -92,10 +92,11 @@ public enum Doctor {
     ///    same verb the real download uses, because the presigned redirect
     ///    target is signed per method. Catches a version bump that no longer
     ///    has a darwin-arm64 asset.
-    /// 10. **Local Network privacy note** (informational). On macOS 15+ the
-    ///     first attempt to reach a guest over the NAT link can be blocked by
-    ///     the Local Network permission prompt, which a background agent cannot
-    ///     answer; the operator must approve the app once.
+    /// 10. **Local Network privacy**. Passes when a subnet allowlist is set in
+    ///     `com.apple.network.local-network`; otherwise informational. On
+    ///     macOS 15+ the first attempt to reach a guest over the NAT link can
+    ///     be blocked by the Local Network permission prompt, which a
+    ///     background agent cannot answer.
     ///
     /// - Parameter config: Validated configuration. Gitea-dependent checks are
     ///   skipped with a ``DoctorCheck/Result/warn`` when no admin token is set.
@@ -523,19 +524,70 @@ public enum Doctor {
     }
 
     /// The macOS 15+ Local Network permission note.
+    ///
+    /// Reports `.pass` when the host carries a subnet allowlist, because that
+    /// bypasses the prompt entirely. Otherwise it stays informational: we
+    /// cannot see the grant itself, since Local Network privacy is a Network
+    /// Extension packet filter rather than a TCC entry, so there is no
+    /// database to query and `tccutil` does not apply (Apple, TN3179).
     public static func localNetworkNote() -> DoctorCheck {
-        DoctorCheck(
-            name: "local network access",
+        let name = "local network access"
+        let allowed = localNetworkAllowlist()
+        if !allowed.isEmpty {
+            return DoctorCheck(
+                name: name,
+                result: .pass,
+                detail: "subnet allowlist set: \(allowed.joined(separator: ", "))"
+            )
+        }
+
+        return DoctorCheck(
+            name: name,
             result: .info,
             detail: "guests are reached over the host-private NAT link",
             remediation: """
                 on macOS 15+ the first connection to a guest can be blocked by the Local Network \
-                privacy prompt, which a background LaunchAgent cannot answer. Approve the app once \
-                under System Settings → Privacy & Security → Local Network.
+                privacy prompt, which a background LaunchAgent cannot answer. The app cannot be \
+                pre-approved: it only appears under System Settings → Privacy & Security → Local \
+                Network once it has actually attempted a guest connection. To trigger and answer \
+                the prompt by hand, run `gitea-macos-runner vm boot --image default` once from a \
+                Terminal in the GUI session. On an unattended CI host prefer the subnet \
+                allowlist, which needs no prompt and survives rebuilds: sudo defaults write \
+                com.apple.network.local-network AllowedEthernetLocalNetworkAddresses -array \
+                "192.168.64.0/24" (then reboot). See docs/setup.md §2.6.
                 """
         )
     }
 
+    /// Subnets pre-authorized for local network access on this host, if any.
+    ///
+    /// Best effort and never fatal: an unreadable or absent preferences file
+    /// simply reads as "no allowlist". The domain is written with `sudo`, so
+    /// which preferences directory it lands in depends on whether that `sudo`
+    /// preserved `HOME` — check each candidate rather than guess.
+    static func localNetworkAllowlist() -> [String] {
+        let keys = ["AllowedEthernetLocalNetworkAddresses", "AllowedWiFiLocalNetworkAddresses"]
+        let candidates = [
+            "/var/root/Library/Preferences/com.apple.network.local-network.plist",
+            "/Library/Preferences/com.apple.network.local-network.plist",
+            NSHomeDirectory() + "/Library/Preferences/com.apple.network.local-network.plist",
+        ]
+
+        var found: [String] = []
+        for path in candidates {
+            guard let data = FileManager.default.contents(atPath: path),
+                let plist = try? PropertyListSerialization.propertyList(
+                    from: data, options: [], format: nil) as? [String: Any]
+            else { continue }
+            for key in keys {
+                for entry in (plist[key] as? [String] ?? []) where !found.contains(entry) {
+                    found.append(entry)
+                }
+            }
+        }
+        return found
+    }
+
     /// Renders checks as aligned, human-readable lines for the CLI.
     public static func format(_ checks: [DoctorCheck]) -> String {
         let width = checks.map(\.name.count).max() ?? 0