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insane.awmn
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PostPosted: Tue Mar 13, 2012 12:04 am    Post subject: dracut image with squashfs root filesystem Reply with quote

Hello everyone ,
I want to use plymooth so i want to boot my squashfs image with the dracut generated image,i tried some kerne boot l args but with no success .
The dracut ebuild has the module dmsquash-live but i cant find any documentation .

Can anyone help ?
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devsk
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PostPosted: Thu Aug 16, 2012 4:03 am    Post subject: Reply with quote

Spooky weird. I asked the same question exactly one year before you...ok 1 year and few hours: https://forums.gentoo.org/viewtopic-p-6611051.html

And the spookier part is that nobody knows...:-)
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xaviermiller
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PostPosted: Thu Aug 16, 2012 6:54 am    Post subject: Reply with quote

Hello,

Take a look at SystemRescueCD: they boot a Gentoo-based squashed image from CD/USB.
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insane.awmn
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PostPosted: Thu Aug 16, 2012 2:23 pm    Post subject: Reply with quote

i am booting with a squashfs image with the genkernel ,but i want to try dracut to take advantage the plymooth plugin.
I had try SystemRescueCD before ,and i think that use the genkernel scripts to mount the squashfs image.
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devsk
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PostPosted: Thu Aug 16, 2012 3:56 pm    Post subject: Reply with quote

insane.awmn wrote:
i am booting with a squashfs image with the genkernel ,but i want to try dracut to take advantage the plymooth plugin.
I had try SystemRescueCD before ,and i think that use the genkernel scripts to mount the squashfs image.
Same exact situation here. genkernel has quirks which are irritating.
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insane.awmn
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PostPosted: Thu Sep 13, 2012 8:37 pm    Post subject: Reply with quote

hello everyone ,

i tested a lot with dracut and finally, i got dracut to boot with the gentoo based squashfs image.
I will get all the infos and i will post where my example for everyone who interesting.
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devsk
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PostPosted: Thu Sep 13, 2012 10:52 pm    Post subject: Reply with quote

insane.awmn wrote:
hello everyone ,

i tested a lot with dracut and finally, i got dracut to boot with the gentoo based squashfs image.
I will get all the infos and i will post where my example for everyone who interesting.
That would be awesome! Thanks!
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insane.awmn
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PostPosted: Sat Sep 15, 2012 3:40 am    Post subject: Reply with quote

i emerge dracut with DRACUT_MODULES="plymouth dmsquash-live dm lvm" and USE flags="device-mapper "
and inside the chrooted system i run
Quote:
#dracut -m "base lvm kernel-modules" -a "dmsquash-live" --filesystems "squashfs" -f

This is ganerate the initramfs in /boot

We must have a kernel with lvm support and the LVM kernel extension to permit snapshotting

outside of chrooted enviroment.
we have the directory /diskless/squashfs (contains the rootfs)
we make a folder name LiveOS indside of a folder LiveOS
Quote:
#mkdir-p /diskless/LiveOS/LiveOS

then go to the directory LiveOS/LiveOS
Quote:
#cd /diskless/LiveOS/LiveOS

we create an EXT3 image
Quote:

#dd if=/dev/zero of=ext3fs.img bs=1M count=4096
#mkfs.ext3 ext3fs.img

we create a directory to mount the ext3fs.img
Quote:

#mkdir -p /diskless/ext3

[quote]mount the ext3fs.img to directory
Quote:
#cd /diskless
mount LiveOS/LiveOS/ext3fs.img ext3/

and then we copy the contents of squashfs-root to ext3 folder
Quote:
#rsync -avHx squashfs/ --exclude='usr/src/*' ext3

umount the ext3fs.img of ext3/
Quote:
#umount ext3

go outside of first LiveOS folder
Quote:
#cd /diskless

make squashfs image
Quote:
#mksquashfs LiveOS/ squashfs.img


I assume that we have a usb stick formated with fat32 ,and the label of that is " LABEL=live" ,with installed grub or grub2 (personaly i use grub2 with EFI,)
in the /boot folder of usb, we put the initramfs image generated by dracut ,and the kernel for the squashfs-root

the grub kernel command is like that:
Quote:
/boot/vmlinux-3.3.8-gentoo root=live:LABEL=live ro rd.live.image

Also you can use UUID=aaaa-bbbb instead LABEL="label of usb"

At the usb stick we create the directory /LiveOS and we copy there the squashfs.img
lets assume that the usb is mounted at /mnt/usb
Quote:
#mkdir /mnt/usb/LiveOS
# cp /diskless/squashfs.img /mnt/usb/LiveOS

if you want to take the advantage of plymouth ,just add in the kernel command the splash or rhgb
Quote:
/boot/vmlinux-3.3.8-gentoo root=live:LABEL=live ro rd.live.image splash


devsk am waiting your results , i am facing problems with the plymouth (only when is enabled in kernel cmd ) at the shutdown-reboot ,i think that something go wrong with the plymouth-openrc-plugin

(and sorry for my poor english....)
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devsk
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PostPosted: Sat Sep 15, 2012 3:50 am    Post subject: Reply with quote

So, the module dmsquash-live uses "LiveOS" for the directory at the USB top level and looks for squashfs.img inside to use as root file system?
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insane.awmn
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PostPosted: Tue Sep 18, 2012 2:51 pm    Post subject: Reply with quote

sorry for my late answer ....

yes...uses the LiveOS directory ,and the squashfs.img is a squashed ext3 image. Do you try it ?
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PostPosted: Wed Sep 19, 2012 2:53 am    Post subject: Reply with quote

insane.awmn wrote:
sorry for my late answer ....

yes...uses the LiveOS directory ,and the squashfs.img is a squashed ext3 image. Do you try it ?
Not yet. I am busy with office work at this time and my genkernel setup is working fine across three machines I have (all three boot with the same squashfs image). I will be able to spend time on this in my next upgrade cycle. But thanks so much for posting the step by step guide. I appreciate it.
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devsk
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PostPosted: Thu Sep 19, 2013 4:24 am    Post subject: Reply with quote

Gets more spooky. 1 year to the date of the last post I made, I still haven't tried this yet. I think its time I do.
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jjonline
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PostPosted: Fri Nov 01, 2013 9:28 am    Post subject: Reply with quote

I make and use livecd to boot,I meet same problem,i get the error of "empty or no root= argument".when i use root= such as root=/dev/sr0,then i can see the plymouth work,but dracut sent me a error of "/dev/mappper/live-rw not found",i google a lot,and i think maybe it is a problem of device-mapper or fstab?
I will focus on this.at last,please forgive my poor english.
2013/11/16
today i tried it again,i thought it is a problem about the dracut initramfs don't know how to switch to new root in squashfs image,maybe no squashfs module,but i gen it with dm-squashfs option,and it wasn't work,i will try it again.
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