---- Andrei Borzenkov <[email protected]> wrote: > В Thu, 25 Jun 2015 17:20:23 +0000 > <[email protected]> пишет: > > > I have a 15GB image file partitioned using fdisk with a single MBR > > partition and containing an ext4 file system which contains my LFS system. > > I used kpartx on this to create /dev/loop0 and /dev/mapper/loop0p1. The > > file system in /dev/loop0p1 is mounted on /mnt. I am chrooted into /mnt > > How exactly? chroot must have at least /dev, /sys and /proc available > for device detection to work. >
Thanks for the help. Following the LFS instructions, I create mountpoints before entering the chroot environment: mount -v --bind /dev /mnt/dev mount -vt devpts devpts /mnt/dev/pts -o gid=5,mode=620 mount -vt proc proc /mnt/proc mount -vt sysfs sysfs /mnt/sys mount -vt tmpfs tmpfs /mnt/run > where my LFS system resides. Grub in the LFS system was built with the > following (from LFS documentation): > > > > ./configure --prefix=/usr \ > > --sbindir=/sbin \ > > --sysconfdir=/etc \ > > --disable-grub-emu-usb \ > > --disable-efiemu \ > > --disable-werror > > > > Command used: > > grub-install --target=i386-pc /dev/loop0 > > > > I do not have environment to test chroot, but the following works > using current upstream master (sans two clean up patches): > > bor@opensuse:~> sudo losetup --find --show /tmp/floppy > /dev/loop0 > bor@opensuse:~> sudo kpartx -a /dev/loop0 > bor@opensuse:~> sudo mount /dev/mapper/loop0p2 /mnt > bor@opensuse:~/build/grub> ./configure ; make > bor@opensuse:~/build/grub> sudo pkgdatadir=$PWD ./grub-install -d grub-core > --boot-directory=/mnt /dev/loop0 > Installing for i386-pc platform. > Installation finished. No error reported. > bor@opensuse:~/build/grub> > > As Jordan suggested, you may be missing libdevmapper dependency. > It does not appear libdevmapper is a part of LFS. I could be wrong, but I don't see it anywhere. I don't understand why grub-install needs to find the partition /dev/mapper/loop0p1 at all. Surely all it needs to do is install to the MBR of /dev/loop0 and the embedded space before the first partition. Why would it need anything other than the device name /dev/loop0 ? Assuming libdevmapper is not an option, how could I bypass grub-install, also assuming my /boot/grub directory is empty at start? I know a bunch of files in /usr/lib/grub/i386-pc need to be copied to /boot/grub/i386-pc and LFS provides a simple grub.cfg. Beyond that I'm lost as to what arguments to grub-mkimage and grub-setup would allow me to build a core.img and apply it directly to /dev/loop0, to work around the problem. Thanks for the help. > > When that failed, I also tried a number of variations on this command, all > > of which also failed. I tried following examples on the net regarding > > creating a device.map and populating it with (hd0) /dev/loop0 > > Grub seems to read the file OK, but the install still fails. > > > > The host machine is a 64-bit install of Debian 8, although that shouldn't > > matter. > > > > If I do this on a real drive instead of a mounted image it works, but that > > doesn't help me. Shouldn't it be possible to install grub to a loopback > > device? > > > > Thanks in advance for any help. > > > > > > > > > > ---- Andrei Borzenkov <[email protected]> wrote: > > > Please, describe your configuration, and provide exact command you used. > > > Otherwise it is impossible to say anything. > > > > > > Отправлено с iPhone > > > > > > > 25 июня 2015 г., в 14:43, <[email protected]> <[email protected]> > > > > написал(а): > > > > > > > > I absolutely cannot get grub-install to do what I need it to do: > > > > Install to the MBR on a disk image that is loop mounted with kpartx, > > > > while chrooted into an ext4 filesystem on the first partition of that > > > > image. The image will be used on a BIOS machine but the physical host > > > > is EFI. > > > > > > > > This is for a linux from scratch 7.7 build and so uses the grub version > > > > found here: http://alpha.gnu.org/gnu/grub/grub-2.02~beta2.tar.xz > > > > > > > > I discovered the "target" argument to override the architecture by > > > > searching the web (it doesn't seem to be mentioned in any detail in the > > > > Grub manual), but I can't get it to install regardless. I get some > > > > nonsensical message about being unable to find 'lvm/loop0p1' although I > > > > am not using lvm in the image. The image only has a single MBR > > > > partition. > > > > > > > > This seems like it should be a simple thing to do and if it is I > > > > apologize, but I really hate it when software tries to be clever in an > > > > effort to 'help' and makes assumptions that turn a simple matter into a > > > > nightmare. > > > > > > > > _______________________________________________ > > > > Help-grub mailing list > > > > [email protected] > > > > https://lists.gnu.org/mailman/listinfo/help-grub > > > _______________________________________________ Help-grub mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-grub
