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nixos/nixos-enter: cleanup resolv.conf handling

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This commit is contained in:
Ben Wolsieffer 2022-03-18 12:19:09 -04:00
parent 1ee3d9477b
commit 69cff425e6
1 changed files with 10 additions and 10 deletions
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20
nixos/modules/installer/tools/nixos-enter.sh
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@ -63,29 +63,29 @@ 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
local chrootDir="$1" resolvConf="$1/etc/resolv.conf"
[[ -e /etc/resolv.conf ]] || return 0
# Handle resolv.conf as a symlink to somewhere else.
if [[ -L $chrootdir/etc/resolv.conf ]]; then
if [[ -L "$resolvConf" ]]; 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$resolv_conf
# We also ignore the possibility of `../`s escaping the root.
resolvConf="$(readlink "$resolvConf")"
if [[ "$resolvConf" = /* ]]; then
resolvConf="$chrootDir$resolvConf"
else
resolv_conf=$chrootdir/etc/$resolv_conf
resolvConf="$chrootDir/etc/$resolvConf"
fi
fi
# ensure file exists to bind mount over
if [[ ! -f $resolv_conf ]]; then
install -Dm644 /dev/null "$resolv_conf" || return 1
if [[ ! -f "$resolvConf" ]]; then
install -Dm644 /dev/null "$resolvConf" || return 1
fi
mount --bind /etc/resolv.conf "$resolv_conf"
mount --bind /etc/resolv.conf "$resolvConf"
}
chroot_add_resolv_conf "$mountPoint" || echo "$0: failed to set up resolv.conf" >&2