Boot and Install ROSA from your own HDD
There are many ways to install ROSA – for example, you can use ISO image located at your hard drive. However, a trick with ISO described in our wiki requires some full-functional operating system to be installed in your machine to perform some preliminary actions. However it can happen that your system is broken and neither you can boot from external device. Our colleague Sergey Sokolov recently met such a problem, and below he describes a solution that helped him to bring his system back to life.
Since I am one of ROSA developers, it is no wonder that I have installed a development release of ROSA Fresh R4 to my notebook (at the time when we even didn't have an Alpha release). Once a day I decided to update my system to the current state of repositories. Unfortunately, it turned out that exactly at that moment a lot of system stuff updates (systemd, glibc, etc.) were ongoing. And I was so unlucky that my system refused to boot after update.
It would be nice to launch Live CD or just reinstall the system, but my machine didn't have CD/DVD recorder, I didn't have a boot USB flash and there was nobody near me to prepare such a boot device for me! However, I remembered that I had an ISO image of ROSA on my HDD.
I took a look at my partition table:
# fdisk -l /dev/sda Disk /dev/sda: 480.1 GB, 480103981056 bytes, 937703088 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sda1 2048 33556479 16777216 82 Linux swap / Solaris /dev/sda2 33556480 96471039 31457280 83 Linux /dev/sda3 96471040 937703087 420616024 5 Extended /dev/sda5 96473088 937703087 420615000 83 Linux
Here /dev/sda1 was a swap which I didn't use anymore, /dev/sda2 was my root and /dev/sda5 was a /home.
The system failed to boot normally, but I still had initrd loaded and dracut console. And that turned out to be enough to do the following actions:
mkdir /mnt mount /dev/sad2 /mnt mount -o bind /dev /mnt/dev mount -o bind /dev/pts /mnt/dev/pts mount -o bind /proc /mnt/proc mount -o bind /sys /mnt/sys mount /dev/sda5 /mnt/home chroot /mnt dd if=/home/path/to/ROSA.FRESH.KDE.R3.x86_64.iso of=/dev/sda1 bs=8M touch /boot/resque.iso vi /boot/grub2/grub.cfg
In grub.cfg, I found rescue.iso item and edited it as follows:
### BEGIN /etc/grub.d/43_resque ###
if [ -f /boot/resque.iso -o -f /boot/sgb.iso ]; then
submenu 'Repair tools' {
if [ -f /boot/resque.iso ]; then
menuentry "Boot rescue CD" {
linux (hd0,1)/isolinux/vmlinuz0 boot=live iso_filename=/dev/sda1 root=live:/dev/sda1 rootfstype=auto ro rd.live.image rhgb splash=silent logo.nologo rd.luks=0 rd.md=0 rd.dm=0
initrd (hd0,1)/isolinux/initrd0.img
}
fi
Finally, I synced filesystem and rebooted. And now I had some kind of recovery partition which could be used to install a system or launch it in Live mode. Just not forget that we should not format sda1 partition when installing a system!
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