Hi ibug
A brief summary of the what you are trying to use these extensions for would be helpful. Based
on what you wrote, I am guessing you are dealing with logical volumes? If that is the case, the
following extensions do exist:
lvm2.tcz which not only contains dmsetup but also includes libdevmapper.tcz and udev-lib.tcz
as dependencies.
These are not required to run applications, rather, the are required to run the operating system
if set up for logical volumes. Not a bug.