On Thu, Sep 24, 2015 at 10:18 AM, Tom H <tomh0...@gmail.com> wrote:
>
> You need to ensure that a proper resolv.conf exists in a chroot before
> switching to it. When installing Gentoo, for example, you "cp -L
> /etc/resolv.conf $chroot/etc" before chrooting because the
> installation tarball doesn't have a resolv.conf. I'm sure that if you
> check the Arch installation scripts, you'll find something similar.
The arch-chroot installation script has the following function:
chroot_add_resolv_conf() {
local chrootdir=$1 resolv_conf=$1/etc/resolv.conf
# Handle resolv.conf as a symlink to somewhere else.
if [[ -L $chrootdir/etc/resolv.conf ]]; then
# readlink(1) should always give us *something* since we know at this point
# it's a symlink. For simplicity, ignore the case of nested symlinks.
resolv_conf=$(readlink "$chrootdir/etc/resolv.conf")
if [[ $resolv_conf = /* ]]; then
resolv_conf=$chrootdir$resolv_conf
else
resolv_conf=$chrootdir/etc/$resolv_conf
fi
# ensure file exists to bind mount over
if [[ ! -f $resolv_conf ]]; then
install -Dm644 /dev/null "$resolv_conf" || return 1
fi
elif [[ ! -e $chrootdir/etc/resolv.conf ]]; then
# The chroot might not have a resolv.conf.
return 0
fi
chroot_add_mount /etc/resolv.conf "$resolv_conf" --bind
}
So they mount the host's resolv.conf on the chroot's.
And there's the following patch in lxc 0.7.5-3ubuntu69:
# cat 0031-ubuntu-template-resolvconf.patch
Description: handle /etc/resolv.conf being a symlink
This will be forwarded upstream.
Author: Serge Hallyn <serge.hal...@ubuntu.com>
Forwarded: no
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/922706
Index: lxc/templates/lxc-ubuntu.in
===================================================================
--- lxc.orig/templates/lxc-ubuntu.in 2012-01-27 10:45:16.167886074 -0600
+++ lxc/templates/lxc-ubuntu.in 2012-01-27 10:50:39.567880601 -0600
@@ -389,9 +389,13 @@
chroot $rootfs apt-get install --force-yes -y
python-software-properties
chroot $rootfs add-apt-repository ppa:ubuntu-virt/ppa
fi
- cp /etc/resolv.conf "${rootfs}/etc"
+ cresolvonf="${rootfs}/etc/resolv.conf"
+ mv $cresolvonf ${cresolvonf}.lxcbak
+ cat /etc/resolv.conf > ${cresolvonf}
chroot $rootfs apt-get update
chroot $rootfs apt-get install --force-yes -y lxcguest
+ rm -f ${cresolvonf}
+ mv ${cresolvonf}.lxcbak ${cresolvonf}
fi
}
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