A new dracut module to implement fstab.sys handling
This module implements fstab.sys handling. This has to happen after the root
mount and before the nfsroot-cleanup pre-pivot at least. I've made to happen at
the beginning of the pre-pivot scripts, although it should maybe be at the end
of the mount scripts. This latter would be harder to do because the actual
mount is currently done by 99mount-root.sh and there is no 2 digit integer
higher than 99 :-(
There are perhaps other ways of achieving this end, such as having the
nfsroot-cleanup trawl through the newroot's /etc/fstab and auto-magically
figure out if there are any mounts which are pre-requisites for the
/var/lib/nfs/rpc_pipefs mount and do them first. Likewise post pivot,
/etc/rc.sysinit could figure out of there are any pre-requisite mounts for
/var/lib/stateless/{writeable,state} before doing those mounts. In short, make
it the responsibility of anything doing a mount to check if there are any
pre-requisites in /etc/fstab and mount them first. However, this spreads the
changes needed over more places, so I favour the fstab.sys approach. Also, who
knows what other uses administartors may have put fstab.sys to? and this undoes
a regression caused by the move from mkinitrd to dracut.
I'm looking for a way to have a system with disposable storage that can be
rebooted and all filesystem changes are thrown away. After reboot, the system
starts with a fresh root volume again. The use case is for automated testing.
We run test scripts that could potentially not clean up after themselves.
This is almost like stateless, but the storage is local to the system (not
iSCSI, NFS or NBB).
1. Install Fedora 13 using default partition layout
NOTE: modify the layout to leave extra room in the LVM volume group
2. Apply attached patch
3. Update grub.conf to enable dracut LVM snapshot support. Add the following
boot arguments
rd_LVM_SNAPSHOT=vg_test1055/lv_snap (note the VG name will depend on your
system).
rd_LVM_SNAPSIZE= (optional, defaults to size of volume specified with by
rd_LVM_SNAPSHOT)
4. Adjust grub.conf and fstab to use LVM snapshot
$ sed -i -e 's|lv_root|lv_snap|' /boot/grub/grub.conf
$ sed -i -e 's|lv_root|lv_snap|' /etc/fstab
5. Reboot system
Expected results (no value provided for rd_LVM_SNAPSIZE):
dracut: Starting plymouth daemon
dracut: rd_NO_DM: removing DM RAID activation
dracut: rd_NO_MD: removing MD RAID activation
dracut: Removing existing LVM snapshot vg_test1055/lv_snap
dracut: Logical volume "lv_snap" successfully removed
dracut: No LVM snapshot size provided, using size of vg_test1055/lv_root (
9024.00m)
dracut: Creating LVM snapshot vg_test1055/lv_snap ( 9024.00m)
dracut: Logical volume "lv_snap" created
dracut: Scanning devices sda2 for LVM logical volumes vg_test1055/lv_root
vg_test1055/lv_swap
dracut: inactive Original '/dev/vg_test1055/lv_root' [8.81 GiB] inherit
dracut: inactive '/dev/vg_test1055/lv_swap' [1.00 GiB] inherit
dracut: inactive Snapshot '/dev/vg_test1055/lv_snap' [8.81 GiB] inherit
dracut: Mounted root filesystem /dev/mapper/vg_test1055-lv_snap
dracut: Loading SELinux policy
dracut: Switching root
Expected results (rd_LVM_SNAPSIZE=100m):
dracut: Starting plymouth daemon
dracut: rd_NO_DM: removing DM RAID activation
dracut: rd_NO_MD: removing MD RAID activation
dracut: Removing existing LVM snapshot vg_test1055/lv_snap
dracut: Logical volume "lv_snap" successfully removed
dracut: Creating LVM snapshot vg_test1055/lv_snap (100m )
dracut: Rounding up size to full physical extent 128.00 MiB
dracut: Logical volume "lv_snap" created
dracut: Scanning devices sda2 for LVM logical volumes vg_test1055/lv_root
vg_test1055/lv_swap
dracut: inactive Original '/dev/vg_test1055/lv_root' [8.81 GiB] inherit
dracut: inactive '/dev/vg_test1055/lv_swap' [1.00 GiB] inherit
dracut: inactive Snapshot '/dev/vg_test1055/lv_snap' [128.00 MiB] inherit
dracut: Mounted root filesystem /dev/mapper/vg_test1055-lv_snap
dracut: Loading SELinux policy
dracut: Switching root
set $RDTIMESTAMP for init, if rd.timestamp is specified on the
kernel command line, so that systemd can print out:
"systemd: Boot finished after 15s = 3s (kernel) + 2s (initrd) + 10s
(userspace)"
- create /lib/bootchart in initramfs, not in live filesystem
- use proper dracut API to install files
Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
First, it's duplicate code.
Second, it did not allow those who had plymouth installed to use other
methods, like the new usb key file. When building the initram,
it would install the plymouth cryptroot-ask script, and not
the crypt module one.
Added these new items to crypt module's cryptroot-ask.sh:
- 'unset' for used variables
- udevsettle
The non-plymouth cryptsetup prompt was using $1 instead of $device.
Changed prompt number from 1 to 5, as this is much nicer.
I believe plymouth already does infinite prompts.
Also added unset for usb key. Just saw it didn't unset its vars.
First we check if $libdir and $usrlibdir vars are already set in config
file. If not we perform simple detect. Vars are exported - to be useful
in module/check scripts.
Current kernels know how to uncompress bzip2 and xz, so use them for compressing
the initramfs if asked. The more compression the merrier.
Also add support for generating uncompressed images, although they
are usually not what you want.
This is a patch series I have been playing with for awhile.
It cleans up some of the dracut code and adds a PKGBUILD file to make
it easier to use in Arch Linux.
Harald Hoyer