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GetCool
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Joined: 23 Nov 2003
Posts: 324
Location: Madison, Wisconsin
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 Posted: Fri Jan 27, 2006 11:24 am Post subject: Additional tips regarding the 32-bit Chroot Guide for AMD64 |
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Following the official 32Bit Chroot Guide for Gentoo/AMD64, I had a couple of issues that required some minor workarounds. I am posting this here because it seems to be documentation-related.
(1) At the point in the guide where it tells to you perform an "emerge world" while inside of your chrooted environment:
| Quote: | Now you have a new 32bits chroot system ready to be updated. Follow the next steps to update it.
Code Listing 9: Updating your new 32bits chroot
--------------------------------------------
| Code: | # source /etc/profile
# env-update
# emerge -au world |
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You may get the following error:
| Code: | These are the packages that I would merge, in order:
Calculating world dependencies / \!!! Cannot resolve a virtual package name to an ebuild.
!!! This is a bug, please report it. (virtual/libintl-0) |
I fixed this problem by first updating portage, then emerging world (while inside the chroot environment, of course):
| Code: | # emerge portage
# emerge -uD world |
(2) The guide shows you how to add a script to your default runlevel which mounts all of the virtual filesystems like /proc and /dev to your /mnt/gentoo32 mount points. Below is the content of the script it gives you:
| Code: | #!/sbin/runscript
depend() {
need localmount
need bootmisc
}
start() {
ebegin "Mounting 32bits chroot dirs"
mount -o bind /dev /mnt/gentoo32/dev >/dev/null &
mount -o bind /dev/pts /mnt/gentoo32/dev/pts >/dev/null &
mount -o bind /dev/shm /mnt/gentoo32/dev/shm >/dev/null &
mount -o bind /proc /mnt/gentoo32/proc >/dev/null &
mount -o bind /proc/bus/usb /mnt/gentoo32/proc/bus/usb >/dev/null &
mount -o bind /sys /mnt/gentoo32/sys >/dev/null &
mount -o bind /tmp /mnt/gentoo32/tmp >/dev/null &
mount -o bind /usr/portage /mnt/gentoo32/usr/portage/ >/dev/null &
eend $? "An error occured while attempting to mount 32bit chroot directories"
ebegin "Copying 32bits chroot files"
cp -pf /etc/resolv.conf /mnt/gentoo32/etc >/dev/null &
cp -pf /etc/passwd /mnt/gentoo32/etc >/dev/null &
cp -pf /etc/shadow /mnt/gentoo32/etc >/dev/null &
cp -pf /etc/group /mnt/gentoo32/etc >/dev/null &
cp -pf /etc/gshadow /mnt/gentoo32/etc >/dev/null &
cp -pf /etc/hosts /mnt/gentoo32/etc > /dev/null &
cp -Ppf /etc/localtime /mnt/gentoo32/etc >/dev/null &
eend $? "An error occured while attempting to copy 32 bits chroot files."
}
stop() {
ebegin "Unmounting 32bits chroot dirs"
umount -f /mnt/gentoo32/dev/pts >/dev/null &
umount -f /mnt/gentoo32/dev/shm >/dev/null &
umount -f /mnt/gentoo32/dev >/dev/null &
umount -f /mnt/gentoo32/proc/bus/usb >/dev/null &
umount -f /mnt/gentoo32/proc >/dev/null &
umount -f /mnt/gentoo32/sys >/dev/null &
umount -f /mnt/gentoo32/tmp >/dev/null &
umount -f /mnt/gentoo32/usr/portage/ >/dev/null &
eend $? "An error occured while attempting to unmount 32bits chroot directories"
} |
I ran into some problems running this script. After issuing a "/etc/init.d/gentoo32 start", I would receive errors that certain mount points did not exist. Similarly, after issuing a "/etc/init.d/gentoo32 stop", I would get additional errors about certain mount points being busy, and unable to be unmounted.
I found that I was experiencing these problems because each command in the script was suffixed with "&". This seemed to cause all of the mount and umount command to be run too quickly, and so, for example, /mnt/gentoo32/proc/bus/usb could not be mounted, since /mnt/gentoo32/proc had not yet been mounted successfully.
I fixed it by simply modifying the script accordingly:
| Code: | #!/sbin/runscript
depend() {
need localmount
need bootmisc
}
start() {
ebegin "Mounting 32bits chroot dirs"
mount -o bind /dev /mnt/gentoo32/dev >/dev/null
mount -o bind /dev/pts /mnt/gentoo32/dev/pts >/dev/null
mount -o bind /dev/shm /mnt/gentoo32/dev/shm >/dev/null
mount -o bind /proc /mnt/gentoo32/proc >/dev/null
mount -o bind /proc/bus/usb /mnt/gentoo32/proc/bus/usb >/dev/null
mount -o bind /sys /mnt/gentoo32/sys >/dev/null
mount -o bind /tmp /mnt/gentoo32/tmp >/dev/null
mount -o bind /usr/portage /mnt/gentoo32/usr/portage/ >/dev/null
eend $? "An error occured while attempting to mount 32bit chroot directories"
ebegin "Copying 32bits chroot files"
cp -pf /etc/resolv.conf /mnt/gentoo32/etc >/dev/null
cp -pf /etc/passwd /mnt/gentoo32/etc >/dev/null
cp -pf /etc/shadow /mnt/gentoo32/etc >/dev/null
cp -pf /etc/group /mnt/gentoo32/etc >/dev/null
cp -pf /etc/gshadow /mnt/gentoo32/etc >/dev/null
cp -pf /etc/hosts /mnt/gentoo32/etc > /dev/null
cp -Ppf /etc/localtime /mnt/gentoo32/etc >/dev/null
eend $? "An error occured while attempting to copy 32 bits chroot files."
}
stop() {
ebegin "Unmounting 32bits chroot dirs"
umount -f /mnt/gentoo32/dev/pts >/dev/null
umount -f /mnt/gentoo32/dev/shm >/dev/null
umount -f /mnt/gentoo32/dev >/dev/null
umount -f /mnt/gentoo32/proc/bus/usb >/dev/null
umount -f /mnt/gentoo32/proc >/dev/null
umount -f /mnt/gentoo32/sys >/dev/null
umount -f /mnt/gentoo32/tmp >/dev/null
umount -f /mnt/gentoo32/usr/portage/ >/dev/null
eend $? "An error occured while attempting to unmount 32bits chroot directories"
} |
(3) Note: This one I haven't figured out yet, so if someone has an idea of what's going on, please let me know.
I also found that while using rxvt-unicode as my VT, after chrooting into my 32-bit environment and trying to perform tasks, I would often get the error:
| Code: | | WARNING: terminal is not fully functional |
Using xterm instead of rxvt-unicode seems to fix this problem. Or, of course the console works too. |
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tbranham
n00b
Joined: 20 Mar 2005
Posts: 1
Location: Washington, D.C.
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| Posted: Tue Jul 04, 2006 1:37 am Post subject: In addition... |
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I also added a couple of extra mount points:
| Code: |
...
mount -o bind /usr/src/linux /mnt/gentoo32/usr/src/linux/ >/dev/null
mount -o bind /home /mnt/gentoo32/home/ >/dev/null
...
umount -f /mnt/gentoo32/usr/src/linux/ >/dev/null
umount -f /mnt/gentoo32/home/ >/dev/null
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I couldn't compile mplayer (well, one of its depends anyway) without a link to the kernel sources, and most of my media files are in my home directory. That took care of it.
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