Support for Repo plugins

code/cli/munki/shared/munkirepo/RepoFactory.swift

@@ -20,6 +20,51 @@
 
 import Foundation
 
+/// Loads a Repo plugin from a dylib
+/// implementation lifted from
+/// https://theswiftdev.com/building-and-loading-dynamic-libraries-at-runtime-in-swift/
+func loadRepoPlugin(at path: String) throws -> RepoPluginBuilder {
+    typealias InitFunction = @convention(c) () -> UnsafeMutableRawPointer
+
+    let openRes = dlopen(path, RTLD_NOW | RTLD_LOCAL)
+    if openRes != nil {
+        defer {
+            dlclose(openRes)
+        }
+
+        let symbolName = "createPlugin"
+        let sym = dlsym(openRes, symbolName)
+
+        if sym != nil {
+            let f: InitFunction = unsafeBitCast(sym, to: InitFunction.self)
+            let pluginPointer = f()
+            let builder = Unmanaged<RepoPluginBuilder>.fromOpaque(pluginPointer).takeRetainedValue()
+            return builder
+        } else {
+            throw MunkiError("Could not find symbol \(symbolName) in lib: \(path)")
+        }
+    } else {
+        if let err = dlerror() {
+            throw MunkiError("Error opening lib: \(String(format: "%s", err)), path: \(path)")
+        } else {
+            throw MunkiError("Error opening lib: unknown error, path: \(path)")
+        }
+    }
+}
+
+/// Try to load a Repo plugin from our RepoPlugins directory
+func findRepoInPlugins(_ name: String, url: String) throws -> Repo? {
+    let pluginName = name + ".plugin"
+    let repoPluginsDir = (Bundle.main.bundlePath as NSString).appendingPathComponent("RepoPlugins")
+    let repoPluginNames = (try? FileManager.default.contentsOfDirectory(atPath: repoPluginsDir)) ?? []
+    if repoPluginNames.contains(pluginName) {
+        let pluginPath = (repoPluginsDir as NSString).appendingPathComponent(pluginName)
+        let repoPlugin = try loadRepoPlugin(at: pluginPath)
+        return repoPlugin.connect(url)
+    }
+    return nil
+}
+
 /// Factory function that returns an instance of a specific Repo class
 func repoConnect(url: String, plugin: String = "FileRepo") throws -> Repo {
     switch plugin {
@@ -28,6 +73,9 @@ func repoConnect(url: String, plugin: String = "FileRepo") throws -> Repo {
     case "GitFileRepo":
         return try GitFileRepo(url)
     default:
+        if let repo = try findRepoInPlugins(plugin, url: url) {
+            return repo
+        }
         throw MunkiError("No repo plugin named \"\(plugin)\"")
     }
 }

code/cli/munki/shared/munkirepo/RepoProtocol.swift

@@ -4,6 +4,19 @@
 //
 //  Created by Greg Neagle on 5/8/25.
 //
+//  Copyright 2024-2025 Greg Neagle.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//       https://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
 
 import Foundation
 

code/cli/munki/shared/munkirepo/repoutils.swift

@@ -4,6 +4,19 @@
 //
 //  Created by Greg Neagle on 7/15/24.
 //
+//  Copyright 2024-2025 Greg Neagle.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//       https://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
 
 import Foundation