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#!/bin/sh -e
#
# helper for update-motd


# poor mans force
if [ "$1" = "--force" ]; then
    NEED_EOL_CHECK=yes
else
    NEED_EOL_CHECK=no
fi

# check time when we did the last update check
stamp="/var/lib/update-notifier/hwe-eol"

# 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_EOL_CHECK=yes
    fi
else
    if [ "$(find "/$StateDir/$ListDir" "/$EtcDir/$SourceList" -type f -print -quit)" ]; then
        NEED_EOL_CHECK=yes
    fi
fi

tmpfile=""
trap cleanup EXIT
tmpfile=$(mktemp -p $(dirname "$stamp"))

# output something for update-motd
if [ "$NEED_EOL_CHECK" = "yes" ]; then
    {
        # the script may exit with status 10 when a HWE update is needed
        /usr/bin/hwe-support-status || true
    } > "$tmpfile"
    mv "$tmpfile" "$stamp"
fi

# output what we have (either cached or newly generated)
cat "$stamp"