Re: Persistent USB to rs232 serial converter device name patch

[Bryan Kadzban <bryan@kadzban.is-a-geek.net>]

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Karl O. Pinc wrote:
> The patches generate udev rules, in extras/rule_generator/, like the
> process that generates persistent nic names, only for ttyUSB devices.

Why not make it act like persistent-storage and persistent-input, and
add symlinks?  The persistent-net stuff can't do that because there is
no such thing as a symlink to a net_device (and even if there was, the
IFNAMSIZ constant in the kernel is too small to handle the longer names
this would generate, and IFNAMSIZ is part of the userspace ABI).  The
persistent-cd stuff can't do that because its symlinks are named e.g.
"cdrom1", and don't have the serial # or path in them, and it needs to
have "cdrom1" always be the same device.

But persistent-storage creates a /dev/disk/by-id/ link that's named with
the disk's SCSI or ATA (or whatever) identifying information, along with
several other /dev/disk/by-*/ links using other info.  I don't see any
reason you couldn't do the same with e.g. /dev/ttyUSB/by-path/ and
/dev/ttyUSB/by-id/ links.  Of course ttyUSB could change; that's just
the first name that came to mind.
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