On 06/16/2011 08:13 PM, Evan Broder wrote:
On Wed, Jun 15, 2011 at 9:47 AM, Scott James Remnant<[email protected]> wrote:
- I would say you should move /proc, /sys& /dev over simply because
Upstart happens to use two of those, and it makes everyone's lives easier
Right now this is handled (on Ubuntu at least) by init-bottom/udev,
which means you could have a script that runs after /proc, /sys, and
/dev are moved (using initramfs-tools' prereq hook).
The udev script moves only the devfs really. The /proc and /sys are
moved by initramfs::init itself.
In the Ubuntu archive, at least, there are only a handful of scripts
that even ship init-bottom hooks, but it looks like selinux might rely
on the filesystems having moved over. Its init-bottom script does
"chroot ${rootmnt} /sbin/load_policy -i", which seems like it probably
requires at least one of /dev, /sys, or /proc.
Yes, you are right. The init-bottom/_load_selinux_policy script is
executed after the udev script. It does need /proc to be in the
initramfs, which it will find because the pivot command executes after
the selinux bottom script. However, what is unclear to me is whether
there this script really expects /dev to be moved on to the real rootfs
i.e is there a dependency between the selinux bottom script execution
and the /dev movement really?.
So the way the current initramfs works is:
1. init-bottom/udev
2. init-bottom/selinux
3. init moves /proc and /sys to @rootfs
4. init calls run_init @roots @init @args
We could preserve this order with the following.
1. keep the moving of the /dev as it is in the udev script
2. selinux script executes as expected.
3. pivot command executes after the init-bottom stops. upstart "pivot"
moves /sys and /proc and then executes the equivalent of run_init.
i.e - for backward compatibility, for now, keep the movement of /dev
from the initramfs to the real rootfs _as is_ in the udev script?
Warm Regards,
Surbhi.
Since we're preserving backwards compatibility by continuing to
support the old-style initramfs-tools scripts directories, it seems
like it might be best if this mechanism in particular was still
handled by something that ran before or at the start of the
init-bottom scripts.
- Evan
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