bcachefs-tools should not use ":" to separate devices

[walexb]

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The df --local command does not list multiple-device bcachefs filesystems, even if it lists single-device ones.

$ df --local /mnt/tmp
df: no file systems processed
$ df /mnt/tmp
Filesystem          1M-blocks   Used Available Use% Mounted on
/dev/sdb1:/dev/sdb3    999736 318746    680991  32% /mnt/tmp

I guess that is because it considers mount-device strings containing a ":" as non-local. Two possible solutions:

• Accept another device-list separator, for example ",".
• Allow specifying a single device as mount device and use a mount option to list additional devices.

I think that the second option is preferable, as there is precedent, and having long mount-device strings screws up the output of df and other commands.

[davidak]

This seem related to https://github.com/koverstreet/bcachefs/issues/1