Comment 26 for bug 683683

@michael,if you only want to debug a running initrd you dont need to repack it, just boot with the break= option (some of the valid values are: top, premount, bottom).
that way you can get a shell inside the initrd, do your debugging tasks and go on booting with ctrl-D
note though that in case of run-init this wont help a lot, since run-init can only be started by pid 1 (break spawns a subshell with new pid)