This is similar to the reason for adding the
/run/initramfs/live-baseloop symlink -- access to the original live
image without overlays.
livemedia-creator does not create a osmin.img, so there is no mountable
device for it to use when rsyncing the live image to the target. It
needs a device that points to the original live image without overlays.
Note that lmc won't be creating osmin.img, since really isn't needed any
longer. Its purpose was to provide a minimal image that could be dd'd to
the target. Now that we use rsync this is no longer necessary.
The included patch adds a /dev/mapper/live-base device that Anaconda can
use whether or not there is an osmin present.
In some cases (at least in mine) mount(8) is in /usr/bin/mount and
not in /bin/mount as dmsquash-live-root.sh expects. PATH is set to
/usr/bin:/usr/sbin:/sbin:/bin in that script anyway.
Brian C. Lane