The std.file rename method fails in the docker environment.

[zoujiaqing]

On Wednesday, 13 March 2024 at 21:21:21 UTC, Jonathan M Davis 
wrote:
> On Wednesday, March 13, 2024 3:03:30 PM MDT zoujiaqing via 
> Digitalmars-d-learn wrote:
>> upload file to server in docker, but upload directory volume 
>> to host machine.
>>
>> Exception error:
>> ```
>> Invalid cross-device link
>> ```
>>
>> Have other function like move(a, b) ?
>>
>> https://github.com/huntlabs/hunt-framework/blob/master/source/hunt/framework /file/File.d#L102
>
> Well, the subject of your post mentions std.file, and then you 
> link to a framework that does basically the same thing. So, I 
> don't know what you're actually using.
>
> However, both of those functions use the OS function, rename, 
> which renames the file within a file system, but it can't move 
> files across file systems. Strictly speaking, it's not possible 
> to move a file across file systems. What a program like mv does 
> when the destination is on a different file system from the 
> source file is copy the file and then delete the original. So, 
> if you want to "move" a file across file systems within your 
> program, you'll have to do the same thing.
>
> There may be a projcet on code.dlang.org which has a function 
> which tries to move the file within the file system and then 
> does a copy and remove instead if moving within the file system 
> doesn't work, but otherwise, you'll have to implement that 
> yourself, which could be as simple as catching the any 
> exceptions from move and then attempting to copy the file and 
> then remove it if an exception was thrown.
>
> - Jonathan M Davis

this is bug in D.

Docker run app code:
```d
reanme("/tmp/aaa", "/data/attachments/aaa");
```

docker volume path:
```txt
VOLUME /data/attachments
```

docker compose yml:
```yml
     volumes:
       - /data/attachments:/data/attachments
```

Error exception:
```
Invalid cross-device link
```