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/etc/cron.daily/apt
Code:
#!/bin/sh

#set -e

#

# This file understands the following apt configuration variables:

# Values here are the default.

# Create /etc/apt/apt.conf.d/02periodic file to set your preference.

#

#  Dir "/";

#  - RootDir for all configuration files

#

#  Dir::Cache "var/apt/cache/";

#  - Set apt package cache directory

#

#  Dir::Cache::Archive "archives/";

#  - Set package archive directory

#

#  APT::Periodic::Enable "1";

#  - Enable the update/upgrade script (0=disable)

#

#  APT::Periodic::BackupArchiveInterval "0";

#  - Backup after n-days if archive contents changed.(0=disable)

#

#  APT::Periodic::BackupLevel "3";

#  - Backup level.(0=disable), 1 is invalid.

#

#  Dir::Cache::Backup "backup/";

#  - Set periodic package backup directory

#

#  APT::Archives::MaxAge "0"; (old, deprecated)

#  APT::Periodic::MaxAge "0"; (new)

#  - Set maximum allowed age of a cache package file. If a cache 

#    package file is older it is deleted (0=disable)

#

#  APT::Archives::MinAge "2"; (old, deprecated)

#  APT::Periodic::MinAge "2"; (new)

#  - Set minimum age of a package file. If a file is younger it

#    will not be deleted (0=disable). Usefull to prevent races 

#    and to keep backups of the packages for emergency.

#

#  APT::Archives::MaxSize "0"; (old, deprecated)

#  APT::Periodic::MaxSize "0"; (new)

#  - Set maximum size of the cache in MB (0=disable). If the cache

#    is bigger, cached package files are deleted until the size

#    requirement is met (the biggest packages will be deleted 

#    first).

#

#  APT::Periodic::Update-Package-Lists "0";

#  - Do "apt-get update" automatically every n-days (0=disable)

#    

#  APT::Periodic::Download-Upgradeable-Packages "0";

#  - Do "apt-get upgrade --download-only" every n-days (0=disable)

#

#  APT::Periodic::Download-Upgradeable-Packages-Debdelta "1";

#  - Use debdelta-upgrade to download updates if available (0=disable)

#

#  APT::Periodic::Unattended-Upgrade "0";

#  - Run the "unattended-upgrade" security upgrade script 

#    every n-days (0=disabled)

#    Requires the package "unattended-upgrades" and will write

#    a log in /var/log/unattended-upgrades

# 

#  APT::Periodic::AutocleanInterval "0";

#  - Do "apt-get autoclean" every n-days (0=disable)

#

#  APT::Periodic::Verbose "0";

#  - Send report mail to root

#      0:  no report            (or null string)

#      1:  progress report      (actually any string)

#      2:  + command outputs    (remove -qq, remove 2>/dev/null, add -d)

#      3:  + trace on                                                                              



check_stamp()

{

    stamp="$1"

    interval="$2"



    if [ $interval -eq 0 ]; then

        debug_echo "check_stamp: interval=0"

        # treat as no time has passed

        return 1

    fi



    if [ ! -f $stamp ]; then

        debug_echo "check_stamp: missing time stamp file: $stamp."

        # treat as enough time has passed

        return 0

    fi



    # compare midnight today to midnight the day the stamp was updated

    stamp_file="$stamp"

    stamp=$(date --date=$(date -r $stamp_file --iso-8601) +%s 2>/dev/null)

    if [ "$?" != "0" ]; then

        # Due to some timezones returning 'invalid date' for midnight on

        # certain dates (eg America/Sao_Paulo), if date returns with error

        # remove the stamp file and return 0. See coreutils bug:

        # http://lists.gnu.org/archive/html/bug-coreutils/2007-09/msg00176.html

        rm -f "$stamp_file"

        return 0

    fi



    now=$(date --date=$(date --iso-8601) +%s 2>/dev/null)

    if [ "$?" != "0" ]; then

        # As above, due to some timezones returning 'invalid date' for midnight

        # on certain dates (eg America/Sao_Paulo), if date returns with error

        # return 0.

        return 0

    fi



    delta=$(($now-$stamp))



    # intervall is in days, convert to sec.

    interval=$(($interval*60*60*24))

    debug_echo "check_stamp: interval=$interval, now=$now, stamp=$stamp, delta=$delta (sec)"



    # remove timestamps a day (or more) in the future and force re-check

    if [ $stamp -gt $(($now+86400)) ]; then

        echo "WARNING: file $stamp_file has a timestamp in the future: $stamp"

        rm -f "$stamp_file"

        return 0

    fi



    if [ $delta -ge $interval ]; then

        return 0

    fi



    return 1

}



update_stamp()

{

    stamp="$1"

    touch $stamp

}



# we check here if autoclean was enough sizewise

check_size_constraints()

{{

    MaxAge=0                                                                                      

    eval $(apt-config shell MaxAge APT::Archives::MaxAge)

    eval $(apt-config shell MaxAge APT::Periodic::MaxAge)



    MinAge=2

    eval $(apt-config shell MinAge APT::Archives::MinAge)

    eval $(apt-config shell MinAge APT::Periodic::MinAge)



    MaxSize=0

    eval $(apt-config shell MaxSize APT::Archives::MaxSize)

    eval $(apt-config shell MaxSize APT::Periodic::MaxSize)



    CacheDir="var/cache/apt/"

    eval $(apt-config shell CacheDir Dir::Cache)

    CacheDir=${CacheDir%/}



    CacheArchive="archives/"

    eval $(apt-config shell CacheArchive Dir::Cache::archives)

    CacheArchive=${CacheArchive%/}



    # sanity check

    if [ -z "$CacheDir" -o -z "$CacheArchive" ]; then

        echo "empty Dir::Cache or Dir::Cache::archives, exiting"

        exit

    fi

    

    Cache="${Dir%/}/${CacheDir%/}/${CacheArchive%/}/"



    # check age

    if [ ! $MaxAge -eq 0 ] && [ ! $MinAge -eq 0 ]; then

        debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge and ctime>$MinAge and mtime>$MinAge"

        find $Cache -name "*.deb"  \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f

    elif [ ! $MaxAge -eq 0 ]; then

        debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge only"

        find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f

    else

        debug_echo "skip aging since MaxAge is 0"

    fi

    

    # check size

    if [ ! $MaxSize -eq 0 ]; then

        # maxSize is in MB

        MaxSize=$(($MaxSize*1024))



        #get current time

        now=$(date --date=$(date --iso-8601) +%s)

        MinAge=$(($MinAge*24*60*60))



        # reverse-sort by mtime

        for file in $(ls -rt $Cache/*.deb 2>/dev/null); do 

            du=$(du -s $Cache)

            size=${du%%/*}

            # check if the cache is small enough

            if [ $size -lt $MaxSize ]; then

                debug_echo "end remove by archive size:  size=$size < $MaxSize"

                break

            fi



            # check for MinAge of the file

            if [ $MinAge -ne 0 ]; then 

                # check both ctime and mtime 

                mtime=$(stat -c %Y $file)

                ctime=$(stat -c %Z $file)

                if [ $mtime -gt $ctime ]; then

                    delta=$(($now-$mtime))

                else

                    delta=$(($now-$ctime))

      fi                                                                                

                if [ $delta -le $MinAge ]; then

                    debug_echo "skip remove by archive size:  $file, delta=$delta < $MinAgeSec"

                    break

                else

                    # delete oldest file

                    debug_echo "remove by archive size: $file, delta=$delta >= $MinAgeSec (sec), size=$size >= $MaxSize"

                    rm -f $file

                fi

            fi

        done

    fi

}



# deal with the Apt::Periodic::BackupArchiveInterval

do_cache_backup()

{

    BackupArchiveInterval="$1"

    if [ $BackupArchiveInterval -eq 0 ]; then

        return

    fi



    # Set default values and normalize

    Dir="/"

    eval $(apt-config shell Dir Dir)

    Dir=${Dir%/}



    CacheDir="var/cache/apt/"

    eval $(apt-config shell CacheDir Dir::Cache)

    CacheDir=${CacheDir%/}

    if [ -z "$CacheDir" ]; then

        debug_echo "practically empty Dir::Cache, exiting"

        return 0

    fi



    CacheArchive="archives/"

    eval $(apt-config shell CacheArchive Dir::Cache::Archives)

    CacheArchive=${CacheArchive%/}

    if [ -z "$CacheArchive" ]; then

        debug_echo "practically empty Dir::Cache::archives, exiting"

        return 0

    fi



    BackupLevel=3

    eval $(apt-config shell BackupLevel APT::Periodic::BackupLevel)

    if [ $BackupLevel -le 1 ]; then 

        BackupLevel=2 ; 

    fi

    

    CacheBackup="backup/"

    eval $(apt-config shell CacheBackup Dir::Cache::Backup)

    CacheBackup=${CacheBackup%/}

    if [ -z "$CacheBackup" ]; then

        echo "practically empty Dir::Cache::Backup, exiting" 1>&2

        return

    fi



    Cache="${Dir}/${CacheDir}/${CacheArchive}/"

    Back="${Dir}/${CacheDir}/${CacheBackup}/"

    BackX="${Back}${CacheArchive}/"

    for x in $(seq 0 1 $((${BackupLevel}-1))); do 

        eval "Back${x}=${Back}${x}/"

    done

    

    # backup after n-days if archive contents changed.

    # (This uses hardlink to save disk space)

    BACKUP_ARCHIVE_STAMP=/var/lib/apt/periodic/backup-archive-stamp

 if check_stamp $BACKUP_ARCHIVE_STAMP $BackupArchiveInterval; then

        if [ $({(cd $Cache 2>/dev/null; find . -name "*.deb"); (cd $Back0 2>/dev/null;find . -name "*.deb") ;}| sort|uniq -u|wc -l) -ne 0 ]; then



    mkdir -p $Back                                                                                                                                    

            rm -rf $Back$((${BackupLevel}-1))

            for y in $(seq $((${BackupLevel}-1)) -1 1); do 

                eval BackY=${Back}$y

                eval BackZ=${Back}$(($y-1))

                if [ -e $BackZ ]; then 

                    mv -f $BackZ $BackY ; 

                fi

            done

            cp -la $Cache $Back ; mv -f $BackX $Back0

            update_stamp $BACKUP_ARCHIVE_STAMP

            debug_echo "backup with hardlinks. (success)"

        else

            debug_echo "skip backup since same content."

        fi

    else

        debug_echo "skip backup since too new."

    fi

}



# sleep for a random interval of time (default 30min)

# (some code taken from cron-apt, thanks)

random_sleep()

{

    RandomSleep=1800

    eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)

    if [ $RandomSleep -eq 0 ]; then

        return

    fi

    if [ -z "$RANDOM" ] ; then

        # A fix for shells that do not have this bash feature.

        RANDOM=$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -c"1-5")

    fi

    TIME=$(($RANDOM % $RandomSleep))

    debug_echo "sleeping for $TIME seconds"

    sleep $TIME

}





debug_echo()

{

    # Display message if $VERBOSE >= 1

    if [ "$VERBOSE" -ge 1 ]; then

        echo $1 1>&2

    fi

}



# ------------------------ main ----------------------------



# Backup the 7 last versions of APT's extended_states file

# shameless copy from dpkg cron

if cd /var/backups ; then

    if ! cmp -s apt.extended_states.0 /var/lib/apt/extended_states; then

        cp -p /var/lib/apt/extended_states apt.extended_states

        savelog -c 7 apt.extended_states >/dev/null

    fi

fi



# check apt-config exstance

if ! which apt-config >/dev/null ; then

        exit 0

fi



# check if the user really wants to do something

AutoAptEnable=1  # default is yes

eval $(apt-config shell AutoAptEnable APT::Periodic::Enable)



if [ $AutoAptEnable -eq 0 ]; then

    exit 0                                                                                                                                                    

fi



# Set VERBOSE mode from  apt-config (or inherit from environment)

VERBOSE=0

eval $(apt-config shell VERBOSE APT::Periodic::Verbose)

debug_echo "verbose level $VERBOSE"

if [ "$VERBOSE" -le 2 ]; then

    # quiet for 0,1,2

    XSTDOUT=">/dev/null"

    XSTDERR="2>/dev/null"

    XAPTOPT="-qq"

    XUUPOPT=""

else

    XSTDOUT=""

    XSTDERR=""

    XAPTOPT=""

    XUUPOPT="-d"

fi

if [ "$VERBOSE" -ge 3 ]; then

    # trace output

    set -x

fi



# laptop check, on_ac_power returns:

#      0 (true)    System is on main power

#      1 (false)  System is not on main power

#      255 (false) Power status could not be determined

# Desktop systems always return 255 it seems

if which on_ac_power >/dev/null; then

    on_ac_power

    POWER=$?

    if [ $POWER -eq 1 ]; then

        debug_echo "exit: system NOT on main power"

        exit 0

    elif [ $POWER -ne 0 ]; then

        debug_echo "power status ($POWER) undetermined, continuing"

    fi

    debug_echo "system is on main power."

fi



# check if we can lock the cache and if the cache is clean

if which apt-get >/dev/null && ! eval apt-get check -f $XAPTOPT $XSTDERR ; then

    debug_echo "error encountered in cron job with \"apt-get check\"."

    exit 0

fi



# Global current time in seconds since 1970-01-01 00:00:00 UTC

now=$(date +%s)



# Support old Archive for compatibility.

# Document only Periodic for all controling parameters of this script.



UpdateInterval=0

eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists)



DownloadUpgradeableInterval=0

eval $(apt-config shell DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)



UnattendedUpgradeInterval=0

eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)



AutocleanInterval=0

eval $(apt-config shell AutocleanInterval APT::Periodic::AutocleanInterval)



BackupArchiveInterval=0

eval $(apt-config shell BackupArchiveInterval APT::Periodic::BackupArchiveInterval)



Debdelta=1                                                                                                                                                    

eval $(apt-config shell Debdelta APT::Periodic::Download-Upgradeable-Packages-Debdelta)



# check if we actually have to do anything that requires locking the cache

if [ $UpdateInterval -eq 0 ] &&

  [ $DownloadUpgradeableInterval -eq 0 ] &&

  [ $UnattendedUpgradeInterval -eq 0 ] &&

  [ $BackupArchiveInterval -eq 0 ] &&

  [ $AutocleanInterval -eq 0 ]; then



    # check cache size

    check_size_constraints



    exit 0

fi



# deal with BackupArchiveInterval

do_cache_backup $BackupArchiveInterval



# sleep random amount of time to avoid hitting the 

# mirrors at the same time

random_sleep



# include default system language so that "apt-get update" will

# fetch the right translated package descriptions

if [ -r /etc/default/locale ]; then

    . /etc/default/locale

    export LANG LANGUAGE LC_MESSAGES LC_ALL

fi



# update package lists

UPDATED=0

UPDATE_STAMP=/var/lib/apt/periodic/update-stamp

if check_stamp $UPDATE_STAMP $UpdateInterval; then

    # check for a new archive signing key (against the master keyring)

    if eval apt-key net-update $XSTDERR; then

      debug_echo "apt-key net-update (success)"

    else

      debug_echo "apt-key net-update (failure)"

    fi

    # run apt-get update

    if eval apt-get $XAPTOPT -y update $XSTDERR; then

        debug_echo "download updated metadata (success)."

        if which dbus-send >/dev/null && pidof dbus-daemon >/dev/null; then

            if dbus-send --system / app.apt.dbus.updated boolean:true ; then

                debug_echo "send dbus signal (success)"

            else

                debug_echo "send dbus signal (error)"

            fi

        else

            debug_echo "dbus signal not send (command not available)"

        fi

        update_stamp $UPDATE_STAMP

        UPDATED=1

        # now run apt-xapian-index if it is installed to ensure the index

        # is up-to-date

        if [ -x /usr/sbin/update-apt-xapian-index ]; then

            nice ionice -c3 update-apt-xapian-index -q

        fi

    else

        debug_echo "download updated metadata (error)"

    fi

else

    debug_echo "download updated metadata (not run)."

fi



# download all upgradeable packages (if it is requested)

DOWNLOAD_UPGRADEABLE_STAMP=/var/lib/apt/periodic/download-upgradeable-stamp

if [ $UPDATED -eq 1 ] && check_stamp $DOWNLOAD_UPGRADEABLE_STAMP $DownloadUpgradeableInterval; then                                                          

    if [ $Debdelta -eq 1 ]; then

        debdelta-upgrade >/dev/null 2>&1 || true

    fi

    if  eval apt-get $XAPTOPT -y -d dist-upgrade $XSTDERR; then

        update_stamp $DOWNLOAD_UPGRADEABLE_STAMP

        debug_echo "download upgradable (success)"

    else

        debug_echo "download upgradable (error)"

    fi

else

    debug_echo "download upgradable (not run)"

fi



# auto upgrade all upgradeable packages

UPGRADE_STAMP=/var/lib/apt/periodic/upgrade-stamp

if [ $UPDATED -eq 1 ] && which unattended-upgrade >/dev/null && check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then

    if unattended-upgrade $XUUPOPT; then

        update_stamp $UPGRADE_STAMP

        debug_echo "unattended-upgrade (success)"

    else

        debug_echo "unattended-upgrade (error)"

    fi

else

    debug_echo "unattended-upgrade (not run)"

fi



# autoclean package archive

AUTOCLEAN_STAMP=/var/lib/apt/periodic/autoclean-stamp

if check_stamp $AUTOCLEAN_STAMP $AutocleanInterval; then

    if  eval apt-get $XAPTOPT -y autoclean $XSTDERR; then

        debug_echo "autoclean (success)."

        update_stamp $AUTOCLEAN_STAMP

    else

        debug_echo "autoclean (error)"

    fi

else

    debug_echo "autoclean (not run)"

fi



# check cache size 

check_size_constraints



#

#    vim: set sts=4 ai :

#
I don't knowingly use prelink.