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#!/bin/bash
# Copyright © 2016-2017 Simon McVittie
# Copyright © 2017-2019 Collabora Ltd.
#
# SPDX-License-Identifier: MIT
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
set -e
set -u
set -o pipefail
me="$(basename "$0")"
if [ "$#" != 1 ] || [ "$1" = '--help' ] || [ "x$(id -u)" != x0 ] ||
! [ -d "$1" ]; then
echo "Run this script as root." >&2
sysroot="$1"
cd "$sysroot"
in_chroot () {
chroot "$sysroot" "$@"
}
in_chroot find / -xdev '(' \
-lname '/etc/alternatives/*' -o \
-lname '/etc/locale.alias' \
')' -exec sh -euc '
while [ $# -gt 0 ]; do
old="$(readlink "$1")"
if target="$(readlink -f "$1")"; then
rel_target="$target" # /usr/bin/more
rel_link="$1" # /usr/bin/pager
target_top="${rel_target#/}" # usr/bin/more
target_top="${target_top%%/*}" # usr
link_top="${rel_link#/}" # usr/bin/pager
link_top="${link_top%%/*}" # usr
if [ "$target_top" = "$link_top" ]; then
# While the part up to the first / is equal, remove it
while [ "${rel_target%%/*}" = "${rel_link%%/*}" ]; do
rel_target="${rel_target#*/}"
rel_link="${rel_link#*/}"
done
# If the link has directories, add enough ../ to escape
while [ "${rel_link#*/}" != "${rel_link}" ]; do
rel_link="${rel_link#*/}"
rel_target="../${rel_target}"
done
fi
echo "Making $1 a symlink to $rel_target (was $old -> ... -> $target)"
ln -fns "$rel_target" "$1"