-#!/bin/sh
-# update-alternatives
-#
-# Copyright (C) 2001 Carl D. Worth
-#
-# This program was inspired by the Debian update-alternatives program
-# which is Copyright (C) 1995 Ian Jackson. This version of
-# update-alternatives is command-line compatible with Debian's for a
-# subset of the options, (only --install, --remove, and --help)
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-
-set -e
-
-# admin dir
-ad="$OPKG_OFFLINE_ROOT/usr/lib/opkg/alternatives"
-
-usage() {
- echo "update-alternatives: $*
-
-Usage: update-alternatives --install <link> <name> <path> <priority>
- update-alternatives --remove <name> <path>
- update-alternatives --help
-<link> is the link pointing to the provided path (ie. /usr/bin/foo).
-<name> is the name in $ad/alternatives (ie. foo)
-<path> is the name referred to (ie. /usr/bin/foo-extra-spiffy)
-<priority> is an integer; options with higher numbers are chosen.
-" >&2
- exit 2
-}
-
-quit() {
- echo "update-alternatives: $*" >&2
- exit 2
-}
-
-register_alt() {
- [ $# -lt 2 ] && return 1
- local name="$1"
- local link="$2"
-
- if [ ! -d $ad ]; then
- mkdir -p $ad
- fi
-
- if [ -e "$ad/$name" ]; then
- local olink=`head -n 1 $ad/$name`
- if [ "$link" != "$olink" ]; then
- echo "update-alternatives: Error: cannot register alternative $name to $link since it is already registered to $olink" >&2
- return 1
- fi
- else
- echo "$link" > "$ad/$name"
- fi
-
- return 0
-}
-
-protect_slashes() {
- sed -e 's/\//\\\//g'
-}
-
-remove_alt() {
- [ $# -lt 2 ] && return 1
- local name="$1"
- local path="$2"
-
- [ ! -f $ad/$name ] && return 0
-
- path=`echo $path | protect_slashes`
- sed -ne "/^$path\>.*/!p" $ad/$name > $ad/$name.new
- mv $ad/$name.new $ad/$name
-}
-
-add_alt() {
- [ $# -lt 3 ] && return 1
- local name="$1"
- local path="$2"
- local priority="$3"
- remove_alt $name $path
- echo "$path $priority" >> $ad/$name
-}
-
-find_best_alt() {
- [ $# -lt 1 ] && return 1
- [ ! -f $ad/$name ] && return 0
-
- link=$OPKG_OFFLINE_ROOT/`head -n 1 $ad/$name`
-
-## path=`sed -ne "1!p" $ad/$name | sort -nr -k2 | head -1 | sed 's/ .*//'`
-## busybox safe:
- path=`sed -ne "1!p" $ad/$name | sed -e "s/\(.*\) \(.*\)/\2 \1/g" | sort -nr | head -n 1 | sed 's/[^ ]* //'`
- if [ -z "$path" ]; then
- echo "update-alternatives: removing $link as no more alternatives exist for it"
- rm $ad/$name
- if [ -L $link ]; then
- rm $link
- fi
- return 0
- fi
-
- if [ ! -e $link -o -L $link ]; then
- local link_dir=`dirname $link`
- if [ ! -d $link_dir ]; then
- mkdir -p $link_dir
- fi
- ln -sf $path $link
- echo "update-alternatives: Linking $link to $path"
- else
- echo "update-alternatives: Error: not linking $link to $path since $link exists and is not a link"
- return 1
- fi
-
- return 0
-}
-
-do_install() {
- if [ $# -lt 4 ]; then
- usage "--install needs <link> <name> <path> <priority>"
- fi
- local link="$1"
- local name="$2"
- local path="$3"
- local priority="$4"
-
- path=`echo $path | sed 's|/\+|/|g'`
-
- # This is a bad hack, but I haven't thought of a cleaner solution yet...
- [ -n "$OPKG_OFFLINE_ROOT" ] && path=`echo $path | sed "s|^$OPKG_OFFLINE_ROOT/*|/|"`
-
- register_alt $name $link
- add_alt $name $path $priority
- find_best_alt $name
-}
-
-do_remove() {
- if [ $# -lt 2 ]; then
- usage "--remove needs <name> <path>"
- fi
- local name="$1"
- local path="$2"
-
- path=`echo $path | sed 's|/\+|/|g'`
-
- # This is a bad hack, but I haven't thought of a cleaner solution yet...
- [ -n "$OPKG_OFFLINE_ROOT" ] && path=`echo $path | sed "s|^$OPKG_OFFLINE_ROOT/*|/|"`
-
- remove_alt $name $path
- find_best_alt $name
-}
-
-###
-# update-alternatives "main"
-###
-
-while [ $# -gt 0 ]; do
- arg="$1"
- shift
-
- case $arg in
- --help)
- usage "help:"
- exit 0
- ;;
- --install)
- do_install $*
- exit $?
- ;;
- --remove)
- do_remove $*
- exit $?
- ;;
- *)
- usage "unknown argument \`$arg'"
- ;;
- esac
-done
-
-usage "at least one of --install or --remove must appear"
-
-exit 0
projects / oweals / opkg-lede.git / commitdiff