Daniel Drake [Sun, 12 Jul 2009 11:02:43 +0000 (12:02 +0100)]
switch_root: add subroot support
The current switch_root can only switch to a new root that is the root
of a mount point.
This patch adds support for "subroots", where the new root is somewhere
below a mount point. It does this by adding in a few extra steps to
chroot into the subroot after the enclosing partition has been moved
and entered.
This will be used by OLPC, who sort-of have 2 copies of Fedora stored
on a single partition under different directory trees, where the
initramfs decides which one to boot into.
NFSv4 rpcbind should need only the rpcbind user, not the entire /etc/passwd.
TODO: /etc/passwd and /etc/group are not removed yet due to 90mdraid.
dledford said he'll go in and clean this up since he has the hardware
to actually test the mdmon stuff.
Harald Hoyer [Fri, 3 Jul 2009 15:44:10 +0000 (17:44 +0200)]
initqueue now loops until /dev/root exists or root is mounted
init now has the following points to inject scripts:
/cmdline/*.sh
scripts for command line parsing
/pre-udev/*.sh
scripts to run before udev is started
/pre-trigger/*.sh
scripts to run before the main udev trigger is pulled
/initqueue/*.sh
runs in parallel to the udev trigger
Udev events can add scripts here with /sbin/initqueue.
If /sbin/initqueue is called with the "--onetime" option, the script
will be removed after it was run.
If /initqueue/work is created and udev >= 143 then this loop can
process the jobs in parallel to the udevtrigger.
If the udev queue is empty and no root device is found or no root
filesystem was mounted, the user will be dropped to a shell after
a timeout.
Scripts can remove themselves from the initqueue by "rm $job".
/pre-mount/*.sh
scripts to run before the root filesystem is mounted
NFS is an exception, because it has no device node to be created
and mounts in the udev events
/mount/*.sh
scripts to mount the root filesystem
NFS is an exception, because it has no device node to be created
and mounts in the udev events
If the udev queue is empty and no root device is found or no root
filesystem was mounted, the user will be dropped to a shell after
a timeout.
/pre-pivot/*.sh
scripts to run before the real init is executed and the initramfs
disappears
All processes started before should be killed here.
The behaviour of the dmraid module demonstrates how to use the new
mechanism. If it detects a device which is part of a raidmember from a
udev rule, it installs a job to scan for dmraid devices, if the udev
queue is empty. After a scan, it removes itsself from the queue.
Harald Hoyer [Fri, 3 Jul 2009 10:24:54 +0000 (12:24 +0200)]
Defer mount to the real mount loop
Udev rules set a /dev/root symlink to the real root and add
a mount script to /mount/. This enables the proper use of pre-mount
scripts and prevents mount being killed by a udev timeout.
Harald Hoyer [Thu, 2 Jul 2009 09:42:35 +0000 (11:42 +0200)]
switch to initqueue handling of events
Jobs are no longer handled inside the udev events.
/sbin/initqueue is called with the commands to queue.
init will work on these jobs sequentially, so that we prevent jobs
from being killed by udev timeouts.
This serialization also prevents some problems introduced by
the udev event parallelization.
Remove the NBD legacy format. It wasn't actually matching Debian's nbdroot implementation.
Talked with Debian nbdroot author and he agreed we shouldn't support their obsolete syntax in dracut.
Their root=/dev/nbd[0-9] is no longer needed. Also their syntax was very standardized requiring
a separate boot= parameter.
Warren Togami [Mon, 22 Jun 2009 20:40:09 +0000 (16:40 -0400)]
Remove dracut invented variations of Legacy nfsroot.txt syntax and accompanying tests.
- Remove root=nfs nfsroot=...
- Remove root=nfs4 nfsroot=...
- Remove root=/dev/nfs4 nfsroot=...
- Legacy nfsroot= without root=/dev/nfs should be unsupported according to the nfsroot.txt.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/filesystems/nfsroot.txt
45 root=/dev/nfs
46
47 This is necessary to enable the pseudo-NFS-device. Note that it's not a
48 real device but just a synonym to tell the kernel to use NFS instead of
49 a real device.
Harald Hoyer [Fri, 19 Jun 2009 11:53:46 +0000 (13:53 +0200)]
add target for "dist" and "gitrpm"
"make gitrpm" creates an rpm from the last git checkin
"make rpm" creates an rpm for the version tagged with $VERSION
"make dist" creates a tarball for the version tagged with $VERSION