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This guide is written around glibc. The method works for gcc and any other 'showstopper' packages glibc downgrades are not supported. You need a glibc-2.6 tarball from someone you trust if you cannot build one.

Given 10G of free space you can build your own. This is essentially a gentoo stage 3 install into a file.

Tip: as /usr/portage is borrowed from the host, you can probably use much less

Boot a liveCD and mount a partition with >10G free space at /mnt/gentoo Make a 10G empty file

dd if=/dev/zero of=/mnt/gentoo/recovery.file count=2500000 bs=4096

Make a filesystem in the file

mke2fs /mnt/gentoo/recovery.file

a journal is wasted. Make a new mount point

mkdir /mnt/fixme

and mount your new filesystem there

mount -o loop -t ext2 /mnt/gentoo/recovery.file /mnt/fixme

untar a stage 3 tarball into /mnt/fixme Do *not* trash your system by untaring to /mnt/gentoo then mount the fake filesystems

mount -t proc none /mnt/fixme/proc
mount -o bind /dev /mnt/fixme/dev

Do not fetch a portage snapshot. Instead, bind mount your real /usr/portage to /mnt/fixme/usr/portage

mount -o bind /mnt/gentoo/usr/portage /mnt/fixme/usr/portage

Continue into the chroot

chroot /mnt/fixme /bin/bash

.... just like the install

source /etc/profile
export PS1="(Do not remove glibc) $PS1"

Now you have a working chroot in a file, continue with

emerge glibc
quickpkg glibc

As you used your own distfiles and portage tree, everything should be available and the glibc binary tarball will be deposted in your own /usr/portage/packages/All, outside the chroot. Untar this glibc to /mnt/gentoo and reboot to test. You can remove recovery.file when its done what you needed.

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Last modified: Wed, 26 Dec 2007 15:59:00 +0000 Hits: 1,810