i've added a new USE=sep-usr flag to busybox. when enabled, this will install a static busybox at /ginit (and have the other busybox paths symlink to that so there's no overhead). this new applet has a hand written set of commands to automatically mount /dev /proc /sys /usr and seed /dev, and then execute the real init (defaulting to /sbin/init).
to use it, update your kernel command line (in grub.conf or whatever) with: init=/ginit if you want to use a different init from /sbin/init, then just do: init=/ginit /some/other/init this code does not require an initramfs, but if you happen to use one anyways, it should be handled automatically. same goes for any other automatic mount aspects of the boot process. this also address the /usr-merge issue since busybox has all the programs it executes built into itself (it's a multicall binary). this is where the openrc early-init scripts failed (they still relied on things in /bin etc...). this also keeps intact the rescue shell scenario. the new applet allows you to execute other applets. so booting the kernel with a command line like so: init=/ginit bb will launch our standard static rescue shell. since it's static, you quite literally don't need any other path in the system other than /. finally, since the recent udev-mount init.d script is completely brain dead and refuses to execute unless devtmpfs is enabled, this code will also automatically mount+seed /dev (via mdev) if need be. note: the automatic mounting of /usr applies only to filesystems that (1) the kernel can natively mount (i.e. no module autoloading) and (2) do not require external mount helpers (i.e. `mount.ntfs3g` or `mount.cifs`). i don't think either of these are a big deal. if they are, well, use an initramfs :P. this should address the council's requirement (sep-/usr w/out initramfs) while allowing the general craziness to proceed w/out forking projects ourselves. this is all in busybox-1.20.0 which is now in the tree. if people want to try it out before i unmask it, that'd be great. seems to work in my qemu setup, and on the s390/s390x systems which really don't have a choice when it comes to a sep-/usr (due to limitations in the s390 hardware env). -mike
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