/usr/lib/update-notifier/update-motd-updates-available is in update-notifier-common 3.168.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | #!/bin/sh -e
#
# helper for update-motd
# poor mans force
if [ "$1" = "--force" ]; then
NEED_UPDATE_CHECK=yes
else
NEED_UPDATE_CHECK=no
fi
# check time when we did the last update check
stamp="/var/lib/update-notifier/updates-available"
# get list dir
StateDir="/var/lib/apt/"
ListDir="lists/"
eval "$(apt-config shell StateDir Dir::State)"
eval "$(apt-config shell ListDir Dir::State::Lists)"
# get dpkg status file
DpkgStatus="/var/lib/dpkg/status"
eval "$(apt-config shell DpkgStatus Dir::State::status)"
# get sources.list file
EtcDir="etc/apt/"
SourceList="sources.list"
eval "$(apt-config shell EtcDir Dir::Etc)"
eval "$(apt-config shell SourceList Dir::Etc::sourcelist)"
# let the actual update be asynchronous to avoid stalling apt-get
cleanup() { rm -f "$tmpfile"; }
# check if we have a list file or sources.list that needs checking
if [ -e "$stamp" ]; then
if [ "$(find "/$StateDir/$ListDir" "/$EtcDir/$SourceList" "/$DpkgStatus" -type f -newer "$stamp" -print -quit)" ]; then
NEED_UPDATE_CHECK=yes
fi
else
if [ "$(find "/$StateDir/$ListDir" "/$EtcDir/$SourceList" -type f -print -quit)" ]; then
NEED_UPDATE_CHECK=yes
fi
fi
tmpfile=""
trap cleanup EXIT
tmpfile=$(mktemp -p $(dirname "$stamp"))
# output something for update-motd
if [ "$NEED_UPDATE_CHECK" = "yes" ]; then
{
echo ""
/usr/lib/update-notifier/apt-check --human-readable
echo ""
} > "$tmpfile"
mv "$tmpfile" "$stamp"
fi
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