Feature Request: Mount points

[kingcrunch]

I know, that there is a MountManager, but introducing different "protocols" (the part before the : in an URI) isn't, what "mounting" actually means. I'd expect something like

$local = new League\Flysystem\Filesystem($localAdapter);
$local->mount('/path/to/images', $s3ImagesAdapter);

So writiting to /path/to/images/foo.png actually pushes the changes to S3, while /path/to/backup/dump.sql uses the local file system. Note, that this is an example and can differ from the actual implementation, but the point is, that I could define "protocols" regarding their use case. For example I can define a "backup"-filesystem, but redirect some of the files to backup to a different storage. And even better I can change adapter at will, when requirements changes, without the need to change the code, that makes use of it. This is especially useful with #126

A different example utilizing the MountManager

$local = new League\Flysystem\Filesystem($localAdapter);

// Add them in the constructor
$manager = new League\Flysystem\MountManager(array(
    'backup' => $local,
));

$manager->mount('backup', '/dbdumps', $databaseS3);
$manager->mount('backup', '/images', $ImagesS3);

So why not using different protocols for db-dumps and images? Thats definitely a solution, but lets imagine I know want to split up images into user-images and cms-images. It is much easier to reconfigure the FS, so that /images/users and /images/cms write to different locations, than to rewrite the application to use images_user:/ and images_cms:/.

[frankdejonge]

Currently there are no plans to implement this. Discussion can continue when there's a PR for this.