Set correct map name for existing LUKS devices #991
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We assume that all LUKS device are named luks-<UUID>. This is true for devices activated by us or UDisks, but manually opened devices can have a different name. This change uses sysfs holders to check the "real" name for opened LUKS devices and makes sure we always set correct state for the LUKS format based on the name (we check whether /dev/mapper/<map_name> exists when checking whether the LUKS format is active or not).
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We assume that all LUKS device are named luks-. This is true
for devices activated by us or UDisks, but manually opened devices
can have a different name. This change uses sysfs holders to check
the "real" name for opened LUKS devices and makes sure we always
set correct state for the LUKS format based on the name (we check
whether /dev/mapper/<map_name> exists when checking whether the
LUKS format is active or not).