Luke Vear wrote: > Hey guys, > > I have successfully made an LFS 6.2 and BLFS 6.2.0 and now i was > wondering if there is a way to turn this into a live cd. I have herd > of Linux-Live and there are .txt's on the LFS website, but they > changed all of my dir's and files into CAPS, so it wouldn't boot. If > there is a tutorial or some scripts that can turn my BLFS system into > a live cd, PLEASE can you post the links on here.
Unfortunately, currently there are no working hints on this. Below is the description of the procedure that is used for the official LiveCD 6.3 r2130. It may or may not work with LFS-6.2. You (not even myself!) will be the first to perform it manually (read: I didn't check what is written below), and there are no guarantees that it works at all. Since the guide below doesn't touch upon hardware detection at all, this CD will work on your computer only. If this disclaimer doesn't stop you from following the instructions, please send the more detailed version when you fill in the gaps and correct the typos below - and I will send the version with proper hardware detection and other things that make the CD work everywhere. You will need to install some additional packages: cpio (see BLFS), device-mapper (ftp://sources.redhat.com/pub/dm/), zisofs-tools (http://www.kernel.org/pub/linux/utils/fs/zisofs/), eject (http://www.ibiblio.org/pub/Linux/utils/disk-management/). All non-BLFS packages are built with "./configure --prefix=/usr && make && make install", except "eject", which needs "autoreconf --force --install --verbose" before this. Your kernel needs to support loop devices, device-mapper snapshot target, ext2 filesystem, and transparent ISO compression: CONFIG_BLK_DEV_LOOP=y CONFIG_MD=y CONFIG_BLK_DEV_DM=y CONFIG_DM_SNAPSHOT=y CONFIG_EXT2_FS=y or m CONFIG_ISO9660_FS=y or m CONFIG_ZISOFS=y For a good start, use http://wiki.linuxfromscratch.org/livecd/browser/trunk/packages/linux/config.x86?rev=2130&format=raw (but this applies to a patched kernel, so please "make oldconfig") We won't turn your existing system into a LiveCD. Instead, we'll use a copy that can be easily thrown away if anything goes wrong. First, create a root.ext2 file containing an empty ext2 filesystem. The size of this file for the official LFS LiveCD is 1.5 GB, but your system may be bigger (replace 1536 with a bigger number below then). mkdir /mnt/work dd if=/dev/null of=/mnt/work/root.ext2 bs=1M seek=1536 mke2fs /mnt/work/root.ext2 Then we'll loop-mount it. mkdir /mnt/work/image mount -o loop /mnt/work/root.ext2 /mnt/work/image Then, copy your system into /mnt/work/image, excluding /dev, /proc, /sys and /home. Create these empty directories, though. The Official LFS LiveCD cheats a bit and doesn't mount tmpfs on /dev (udev works on ext2). This means that some devices have to be created manually: MP=/mnt/work/image mknod -m 600 $MP/dev/console c 5 1 mknod -m 666 $MP/dev/null c 1 3 mknod -m 666 $MP/dev/zero c 1 5 mknod -m 666 $MP/dev/ptmx c 5 2 mknod -m 666 $MP/dev/tty c 5 0 mknod -m 444 $MP/dev/random c 1 8 mknod -m 444 $MP/dev/urandom c 1 9 ln -s /proc/self/fd $MP/dev/fd ln -s /proc/self/fd/0 $MP/dev/stdin ln -s /proc/self/fd/1 $MP/dev/stdout ln -s /proc/self/fd/2 $MP/dev/stderr ln -s /proc/kcore $MP/dev/core After this, run "chroot /mnt/work/image" to enter the copy of your system. Add the following line to /etc/inittab: sd:06:once:/usr/bin/shutdown-helper Save this script as /usr/bin/shutdown-helper, replace the string "@LINKER@" with "ld-linux.so.2", chmod it to 0755: http://wiki.linuxfromscratch.org/livecd/browser/trunk/scripts/shutdown-helper.in?rev=2130&format=raw Since on the CD the tmpfs is mounted on /dev/shm by the initramfs, it has to be removed from /etc/fstab. Reinstall LFS-Bootscripts with this patch: http://wiki.linuxfromscratch.org/livecd/browser/trunk/packages/lfs-bootscripts/lfs-bootscripts-livecd-1.patch?rev=2030&format=raw (use "make install-livecd" instead of "make install", and be sure to remove old bootscripts, including "reboot" and "shutdown") Download the following files: http://wiki.linuxfromscratch.org/livecd/browser/trunk/packages/initramfs/create-initramfs.in?rev=2130&format=raw http://wiki.linuxfromscratch.org/livecd/browser/trunk/packages/initramfs/fakecd.iso.head?rev=2130&format=raw http://wiki.linuxfromscratch.org/livecd/browser/trunk/packages/initramfs/init.in?rev=2130&format=raw Edit all *.in files by replacing "@LINKER@" with "ld-linux.so.2". Store "init.in" and "fakecd.iso.head" in /usr/share/initramfs, and "create-initramfs" in /usr/bin (with 0755 permissions). For your kernel version (assuming 2.6.22.5 below), run: create-initramfs "my-unofficial" "2.6.22.5" initramfs_data.cpio.gz Sorry if "no such file" errors appear - this script is designed to work only with fully modular kernels, which are not currently supported by LFS. You may thus need to adjust the list of directories to look for modules in this script. This will produce the initramfs_data.cpio.gz file that looks for the CD with the label "lfslivecd-my-unofficial". If you change the "my-unofficial" string, be sure to also change it in the "mkisofs" command below. This initramfs is designed to find the CD by its label, set up the device mapper so that the /dev/mapper/lfs-cd device contains the same bytes as root.ext2 (but with the possibility to write into it), and mount /dev/mapper/lfs-cd as a root device. Now exit the chroot, copy the initramfs_data.cpio.gz file and the kernel image out of the chroot. Unmount the root.ext2 file: umount /mnt/work/image Now, create the /mnt/work/iso/boot/isolinux directory and put the kernel image (renamed to "linux") and this initramfs_data.cpio.gz file there. Also, create the isolinux.cfg file there with the following contents: default linux prompt 1 timeout 600 label linux kernel linux append initrd=initramfs_data_cpio.gz Note that the underscore before the "cpio" is not a typo. It refers to a non-rock-ridge name of this file. Download syslinux from http://www.kernel.org/pub/linux/utils/boot/syslinux/ , extract the tarball, find the isolinux.bin file there, put it into the /mnt/work/iso/boot/isolinux directory. Then, compress the root.ext2 file: mkzftree -F /mnt/work/root.ext2 /mnt/work/iso/root.ext2 As a result, you'll have: /mnt/work/iso/root.ext2 (compressed root fs image) /mnt/work/iso/boot/isolinux/linux (the kernel) /mnt/work/iso/boot/isolinux/initramfs_data.cpio.gz (the initramfs) /mnt/work/iso/boot/isolinux/isolinux.cfg (boot loader configuration) /mnt/work/iso/boot/isolinux/isolinux.bin (isolinux boot loader) Then create the iso image of your own LiveCD: cd /mnt/work/iso mkisofs -z -R -l --allow-leading-dots -D -o ../lfslivecd-my-unofficial.iso \ -b boot/isolinux/isolinux.bin \ -c boot/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table \ -V "lfslivecd-my-unofficial" ./ Then burn and test the iso. -- Alexander E. Patrakov -- http://linuxfromscratch.org/mailman/listinfo/livecd FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
