Set User-Agent header for OCI HTTP requests (#478)

* Set User-Agent header for OCI HTTP requests

* IORegistry value is actually a NUL-terminated C string

* Use sysctl instead of IOKit

Package.resolved

@@ -81,6 +81,15 @@
         "version" : "1.0.2"
       }
     },
+    {
+      "identity" : "swift-sysctl",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/sersoft-gmbh/swift-sysctl.git",
+      "state" : {
+        "revision" : "71fd64ee84819bb19fbecfb36d5a4503726b6fb7",
+        "version" : "1.6.0"
+      }
+    },
     {
       "identity" : "swiftdate",
       "kind" : "remoteSourceControl",

Package.swift

@@ -20,6 +20,7 @@ let package = Package(
     .package(url: "https://github.com/nicklockwood/SwiftFormat", from: "0.50.6"),
     .package(url: "https://github.com/getsentry/sentry-cocoa", from: "8.3.3"),
     .package(url: "https://github.com/cfilipov/TextTable", branch: "master"),
+    .package(url: "https://github.com/sersoft-gmbh/swift-sysctl.git", from: "1.0.0"),
   ],
   targets: [
     .executableTarget(name: "tart", dependencies: [
@@ -32,6 +33,7 @@ let package = Package(
       .product(name: "Atomics", package: "swift-atomics"),
       .product(name: "Sentry", package: "sentry-cocoa"),
       .product(name: "TextTable", package: "TextTable"),
+      .product(name: "Sysctl", package: "swift-sysctl"),
     ], exclude: [
       "OCI/Reference/Makefile",
       "OCI/Reference/Reference.g4",

Sources/tart/DeviceInfo/DeviceInfo.swift

@@ -0,0 +1,37 @@
+import Foundation
+import Sysctl
+
+class DeviceInfo {
+  private static var osMemoized: String? = nil
+  private static var modelMemoized: String? = nil
+
+  static var os: String {
+    if let os = osMemoized {
+      return os
+    }
+
+    osMemoized = getOS()
+
+    return osMemoized!
+  }
+
+  static var model: String {
+    if let model = modelMemoized {
+      return model
+    }
+
+    modelMemoized = getModel()
+
+    return modelMemoized!
+  }
+
+  private static func getOS() -> String {
+    let osVersion = ProcessInfo.processInfo.operatingSystemVersion
+
+    return "macOS \(osVersion.majorVersion).\(osVersion.minorVersion).\(osVersion.patchVersion)"
+  }
+
+  private static func getModel() -> String {
+    return SystemControl().hardware.model
+  }
+}

Sources/tart/OCI/Registry.swift

@@ -387,6 +387,9 @@ class Registry {
       request.addValue(value, forHTTPHeaderField: name)
     }
 
+    request.setValue("Tart/\(CI.version) (\(DeviceInfo.os); \(DeviceInfo.model))",
+                     forHTTPHeaderField: "User-Agent")
+
     return try await Fetcher.fetch(request, viaFile: viaFile)
   }
 }