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- #!/bin/sh -e
- #
- # updates_available: calculate and cache the number of updates available
- # Copyright (C) 2008 Canonical Ltd.
- #
- # Authors: Dustin Kirkland <kirkland@canonical.com>
- #
- # 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, version 3 of the License.
- #
- # 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.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- if [ "$1" = "--detail" -o "$1" = "--short" ]; then
- if which apt-get >/dev/null; then
- detail=`apt-get -s -o Debug::NoLocking=true upgrade`
- if [ "$1" = "--detail" ]; then
- printf "$detail"
- else
- short=`printf "$detail" | grep ^Inst | wc -l`
- printf "$short"
- fi
- fi
- exit 0
- fi
-
- print_updates() {
- u=$1
- s=$2
- if [ -n "$u" ]; then
- if [ "$u" -gt 0 ]; then
- printf "\005{=b rW}%d\005{-}\005{= rW}!" "$u"
- if [ -n "$s" ]; then
- if [ "$s" -gt 0 ]; then
- printf "!"
- fi
- fi
- printf "\005{-} "
- fi
- fi
- }
-
- update_cache() {
- mycache=$1
- # Now we actually have to do hard computational work to calculate updates.
- # Let's try to be "nice" about it:
- renice 10 $$ >/dev/null 2>&1 || true
- ionice -c3 -p $$ >/dev/null 2>&1 || true
- # These are very computationally intensive processes.
- # Background this work, have it write to the cache files,
- # and let the next cache check pick up the results.
- if [ -x /usr/lib/update-notifier/apt-check ]; then
- # If apt-check binary exists, use it
- /usr/lib/update-notifier/apt-check 2>&1 | tail -n 1 | sed "s/;/ /" > $mycache &
- elif which apt-get >/dev/null; then
- # If apt-get exists, use it
- apt-get -s -o Debug::NoLocking=true upgrade | grep -c ^Inst > $mycache &
- elif which zypper >/dev/null; then
- # If zypper exists, use it
- zypper --no-refresh lu --best-effort | grep 'v |' | wc -l > $mycache &
- elif which yum >/dev/null; then
- # If yum exists, use it
- # TODO: We need a better way of counting updates available from a RH expert
- yum list updates -q | egrep -v "Updated Packages" | wc -l > $mycache &
- fi
- }
-
- PKG="byobu"
-
- # The following is somewhat Ubuntu and Debian specific (apt).
- # I would welcome contributions from other distros to make this
- # more distro-agnostic.
-
- [ -d "/var/run/screen/S-$USER" ] && DIR="/var/run/screen/S-$USER" || DIR="$HOME/.byobu"
- mycache="$DIR/$PKG.updates-available"
-
- # If mycache is present, use it
- [ -r $mycache ] && print_updates `grep "^[0-9]" $mycache | sed "s/ .*$//"`
-
- # Update the cache if necessary
- if [ ! -e "$mycache" ] || [ "/var/lib/apt" -nt "$mycache" ] || [ "/var/lib/apt/lists" -nt "$mycache" ]; then
- # If apt is newer than mycache, background an update now
- update_cache "$mycache"
- fi
-