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nixos/nixos-enter: bind mount /etc/resolv.conf to chroot

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Artturin 2021-09-13 20:56:03 +03:00
parent 23f71e9427
commit 9145f833cc
1 changed files with 29 additions and 0 deletions
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29
nixos/modules/installer/tools/nixos-enter.sh
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@ -60,6 +60,35 @@ chmod 0755 "$mountPoint/dev" "$mountPoint/sys"
mount --rbind /dev "$mountPoint/dev"
mount --rbind /sys "$mountPoint/sys"
# modified from https://github.com/archlinux/arch-install-scripts/blob/bb04ab435a5a89cd5e5ee821783477bc80db797f/arch-chroot.in#L26-L52
chroot_add_resolv_conf() {
local chrootdir=$1 resolv_conf=$1/etc/resolv.conf
[[ -e /etc/resolv.conf ]] || return 0
# Handle resolv.conf as a symlink to somewhere else.
if [[ -L $chrootdir/etc/resolv.conf ]]; then
# readlink(1) should always give us *something* since we know at this point
# it's a symlink. For simplicity, ignore the case of nested symlinks.
# We also ignore the possibility if `../`s escaping the root.
resolv_conf=$(readlink "$chrootdir/etc/resolv.conf")
if [[ $resolv_conf = /* ]]; then
resolv_conf=$chrootdir$resolv_conf
else
resolv_conf=$chrootdir/etc/$resolv_conf
fi
fi
# ensure file exists to bind mount over
if [[ ! -f $resolv_conf ]]; then
install -Dm644 /dev/null "$resolv_conf" || return 1
fi
mount --bind /etc/resolv.conf "$resolv_conf"
}
chroot_add_resolv_conf "$mountPoint" || print "ERROR: failed to set up resolv.conf"
(
# If silent, write both stdout and stderr of activation script to /dev/null
# otherwise, write both streams to stderr of this process