Modules are now responsible for loading their hooks into the initrd.
This should be all the structure we need to make it easy for things
to integrate with dracut -- now to document and test it all.
We can use sh -c to accomplish the same goal
Also move cat back on to the list of debugging tools -- all the files we were
using it on in the initrd can use read to accomplish the same goal.
Any script placed in /pre-udev will be sourced just before udev starts
device scanning and loading.
Any script placed in /pre-mount will be sourced just before we try to
mount a root filesystem.
Any script placed in /pre-pivot will be sourced just before we switch to the
new root filesystem.
These hooks should be the minimum needed to add back plymouth and deal with
more advanced filesysem mounting needs (multipath, iscsi, nfs, nbd, etc.)
Victor Lowther