How can I get the execution path?

Try FileManager.default.currentDirectoryPath for current working directory (CWD) or Bundle.main.bundlePath for execution path.

or Bundle.main.bundlePath for execution path.

You have to be careful about this because Bundle contains a lot of complex logic and so the path you get back can change depending on the file system hierarchy in which your tool is placed.

My go-to API for this is _NSGetExecutablePath. Admittedly, this isn’t easy to call from Swift:

func mainExecutable() -> URL {
    var buf = [CChar](repeating: 0, count: Int(MAXPATHLEN))
    var bufSize = UInt32(buf.count)
    let success = _NSGetExecutablePath(&buf, &bufSize) >= 0
    if !success {
        buf = [CChar](repeating: 0, count: Int(bufSize))
        let success2 = _NSGetExecutablePath(&buf, &bufSize) >= 0
        guard success2 else { fatalError() }
    }
    return URL(fileURLWithFileSystemRepresentation: buf, isDirectory: false, relativeTo: nil)
}

However, even this isn’t with its challenges. To quote the doc comment in <mach-o/dyld.h>:

Note that _NSGetExecutablePath will return "a path" to the executable not a "real path" to the executable. That is the path may be a symbolic link and not the real file.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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