Created attachment 5656 [details]
a quick&dirty patch to allow '|' in devmapper device node names

This patch extends _is_whitelisted_char() with an EVMS specific "|" since e.g. lvm2 plugin would result in node names like "/dev/mapper/lvm2|$vg|$lv" and libdevmapper wouldn't let these through complaining that, e.g.,
> The name "lvm2|main|root" should be mangled but it contains blacklisted characters.

It was proposed upstream on the official #device-mapper freenode channel, so far found debatable due to the potential security implications of the pipe character in faulty scripts given the possibility of coercing an unsuspecting [EVMS] user to insert a rogue usbflash but otherwise not turned down unequivocally; will submit to an upstream ML as suggested by asalor.

I can prepare a proper NMU with this patch in alt/ if you don't mind; in the mean time will work with upstream to get it there as a legacy compatibility option.