[swift-users] FileManager.copyItem not throwing?

[Howard Lovatt]

I don’t have any inside knowledge on this, i.e. I am not certain I am correct, but my understanding was that you were meant to let it throw and catch the error rather than test before hand. 

-- Howard.

> On 11 Nov 2017, at 12:51 pm, Marco S Hyman via swift-users <swift-users at swift.org> wrote:
> 
> 
>> Running on macOS 10.12.6, Xcode 8.3.2, I get to the copyItem call, which shows an error on the console:
>> 
>> 2017-11-11 11:18:25.931446+1000 MyApp[32662:2408351] open on /path/to/file: Permission denied
>> 
>> But it doesn't go to either of my catch blocks, but goes to the following line, where the completion handler is to be run. What is going on?
> 
> Known (by Apple) bug.  My report was closed as a duplicate of 30350792.
> 
> My workaround is to do this in my do block after attempting to copy a file to saveFileUrl:
> 
>    try fileManager.copyItem(at: url, to: saveFileUrl)
>    /// DANGER WILL ROBINSON -- the above call can fail to return an
>    /// error when the file is not copied.  radar filed and
>    /// closed as a DUPLICATE OF 30350792 which is still open.
>    /// As a result I must verify that the copied file exists
>    if !fileManager.fileExists(atPath: (saveFileUrl.path)) {
>        unexpected(error: nil,
>                   "Cannot copy \(url.path) to \(saveFileUrl.path)")
>        return false
>    }
> 
> which duplicates what the catch block would do.
> 
> Marc
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