SPM plugin launching Process doesn't seems to have access to internet connection

Using Swift
1

I've created an executable in Swift.
This executable downloads some files precompiled binaries from a repository. The executable uses URLConnection.
Now I'm trying to wrap this executable into a swift package commend plugin.

.plugin(
            name: "DepPackagePlugin",
            capability: .command(
                intent: .custom(
                    verb: "download-dependencies",
                    description: "Download dependencies"
                ),
                permissions: [
                    .writeToPackageDirectory(reason: "to download dependencies")
                ]
            )
        )

The plugin is visible in the list of available plugins.

@main
struct DepPackagePlugin: CommandPlugin {
    func performCommand(context: PluginContext, arguments: [String]) async throws {
        let directoryPlugin = context.package.directory
        let commandPath =  directoryPlugin.appending("DepDownloader").string
        print(commandPath)
        let destinationPath = directoryPlugin.string
        print(destinationPath)
        let process = Process()
        process.executableURL = URL(fileURLWithPath: commandPath)
        process.arguments = [
            destinationPath
        ]
        print(process.arguments)
        print(process.executableURL)
        try process.run()
        process.waitUntilExit()
        
        if process.terminationReason == .exit && process.terminationStatus == 0 {
            print("Dowloaded dependencies to  \(destinationPath).")
        }
        else {
            let problem = "\(process.terminationReason):\(process.terminationStatus)"
            Diagnostics.error("Invocation failed: \(problem)")
        }
    }
}

The implementation creates a process with the required arguments.
The executable, launched directly using bash works properly, but if I try to call it using SPM, it exits before even trying to connect to the repository. Doing a MiM I see that the url is not even called.
The error I get is this:

2023-02-03 11:00:25.487 EmPackage[9270:10276199] Error: stepSQLStatement:toCompletionWithRetry - stepping returned unhandled result=8, DB=/Users/XYZ/Library/Caches/DepDownloader/Cache.db
Error: The operation couldn’t be completed. Operation not permitted
error: Invocation failed: NSTaskTerminationReason(rawValue: 1):1

Does command plugin supports Internet connection? it doesn't' seems to exist such a permission.
Or it is due to a wrong configuration in the URLConnection used inside the executable?

2

I've read that plugins are run in a sandbox where network access is not available :frowning:

3

Have you tried --disable-sandbox?

mikolasstuchlik@Mikolas-MacBook-Pro SST_iOS % swift build --help | grep sandbox
  --disable-sandbox       Disable using the sandbox when executing subprocesses
4

Unfortunately, is not present in the package subcommand that is needed to launch the plugin

5

Can you share the exact command that you're trying to use? Something like swift package --disable-sandbox download-dependencies should work.

1 Like
6

Damn, invertire the order of --allow-writing-to-package-directory and --disable-sandbox it worked!!!
Amazing! thank you so much!

1 Like