when specifying multiple types, mount will mount

[Benno Schulenberg <bensberg@justemail.net>]

Hi,

Current mount (2.25) will always mount a device when more
than one type is given in a comma-separated list.  Older mount
(2.17.2 for example) would not not do that but error out.

For example, /dev/sda2 is of type ext4, but we are playing dumb,
to see what mount will say:

$ sudo ./mount /dev/sda2 /place -t btrfs
lt-mount: /dev/sda2: can't read superblock

$ sudo ./mount /dev/sda2 /place -t msdos
lt-mount: wrong fs type, bad option, bad superblock on /dev/sda2,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

$ sudo ./mount /dev/sda2 /place -t btrfs,msdos

$ ./mount | grep sda2
/dev/sda2 on /place type ext4 (rw)

I find this surprising.  If -t does not support a comma-separated
list, it should report an error.  If it does, it should, IMO, only
try the specified types and not any others.

Benno

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