debian/apt.cron.daily

   1 #!/bin/sh
   2 #set -e
   3 #
   4 # This file understands the following apt configuration variables:
   5 # Values here are the default.
   6 # Create /etc/apt/apt.conf.d/10periodic file to set your preference.
   7 #
   8 #  Dir "/";
   9 #  - RootDir for all configuration files
  10 #
  11 #  Dir::Cache "var/cache/apt/";
  12 #  - Set apt package cache directory
  13 #
  14 #  Dir::Cache::Archives "archives/";
  15 #  - Set package archive directory
  16 #
  17 #  APT::Periodic::Enable "1";
  18 #  - Enable the update/upgrade script (0=disable)
  19 #
  20 #  APT::Periodic::BackupArchiveInterval "0";
  21 #  - Backup after n-days if archive contents changed.(0=disable)
  22 #
  23 #  APT::Periodic::BackupLevel "3";
  24 #  - Backup level.(0=disable), 1 is invalid.
  25 #
  26 #  Dir::Cache::Backup "backup/";
  27 #  - Set periodic package backup directory
  28 #
  29 #  APT::Archives::MaxAge "0"; (old, deprecated)
  30 #  APT::Periodic::MaxAge "0"; (new)
  31 #  - Set maximum allowed age of a cache package file. If a cache
  32 #    package file is older it is deleted (0=disable)
  33 #
  34 #  APT::Archives::MinAge "2"; (old, deprecated)
  35 #  APT::Periodic::MinAge "2"; (new)
  36 #  - Set minimum age of a package file. If a file is younger it
  37 #    will not be deleted (0=disable). Useful to prevent races
  38 #    and to keep backups of the packages for emergency.
  39 #
  40 #  APT::Archives::MaxSize "0"; (old, deprecated)
  41 #  APT::Periodic::MaxSize "0"; (new)
  42 #  - Set maximum size of the cache in MB (0=disable). If the cache
  43 #    is bigger, cached package files are deleted until the size
  44 #    requirement is met (the oldest packages will be deleted
  45 #    first).
  46 #
  47 #  APT::Periodic::Update-Package-Lists "0";
  48 #  - Do "apt-get update" automatically every n-days (0=disable)
  49 #
  50 #  APT::Periodic::Download-Upgradeable-Packages "0";
  51 #  - Do "apt-get upgrade --download-only" every n-days (0=disable)
  52 #
  53 #  APT::Periodic::Download-Upgradeable-Packages-Debdelta "1";
  54 #  - Use debdelta-upgrade to download updates if available (0=disable)
  55 #
  56 #  APT::Periodic::Unattended-Upgrade "0";
  57 #  - Run the "unattended-upgrade" security upgrade script
  58 #    every n-days (0=disabled)
  59 #    Requires the package "unattended-upgrades" and will write
  60 #    a log in /var/log/unattended-upgrades
  61 #
  62 #  APT::Periodic::AutocleanInterval "0";
  63 #  - Do "apt-get autoclean" every n-days (0=disable)
  64 #
  65 #  APT::Periodic::Verbose "0";
  66 #  - Send report mail to root
  67 #      0:  no report             (or null string)
  68 #      1:  progress report       (actually any string)
  69 #      2:  + command outputs     (remove -qq, remove 2>/dev/null, add -d)
  70 #      3:  + trace on
  71 #
  72 #  APT::Periodic::RandomSleep "1800";
  73 #  - The apt cron job will delay its execution by a random
  74 #    time span between zero and 'APT::Periodic::RandomSleep'
  75 #    seconds.
  76 #    This is done because otherwise everyone would access the
  77 #    mirror servers at the same time and put them collectively
  78 #    under very high strain.
  79 #    You can set this to '0' if you are using a local mirror and
  80 #    do not care about the load spikes.
  81 #    Note that sleeping in the apt job will be delaying the
  82 #    execution of all subsequent cron.daily jobs.
  83 #
  84
  85 check_stamp()
  86 {
  87     stamp="$1"
  88     interval="$2"
  89
  90     if [ $interval -eq 0 ]; then
  91         debug_echo "check_stamp: interval=0"
  92         # treat as no time has passed
  93         return 1
  94     fi
  95
  96     if [ ! -f $stamp ]; then
  97         debug_echo "check_stamp: missing time stamp file: $stamp."
  98         # treat as enough time has passed
  99         return 0
 100     fi
 101
 102     # compare midnight today to midnight the day the stamp was updated
 103     stamp_file="$stamp"
 104     stamp=$(date --date=$(date -r $stamp_file --iso-8601) +%s 2>/dev/null)
 105     if [ "$?" != "0" ]; then
 106         # Due to some timezones returning 'invalid date' for midnight on
 107         # certain dates (e.g. America/Sao_Paulo), if date returns with error
 108         # remove the stamp file and return 0. See coreutils bug:
 109         # http://lists.gnu.org/archive/html/bug-coreutils/2007-09/msg00176.html
 110         rm -f "$stamp_file"
 111         return 0
 112     fi
 113
 114     now=$(date --date=$(date --iso-8601) +%s 2>/dev/null)
 115     if [ "$?" != "0" ]; then
 116         # As above, due to some timezones returning 'invalid date' for midnight
 117         # on certain dates (e.g. America/Sao_Paulo), if date returns with error
 118         # return 0.
 119         return 0
 120     fi
 121
 122     delta=$(($now-$stamp))
 123
 124     # interval is in days, convert to sec.
 125     interval=$(($interval*60*60*24))
 126     debug_echo "check_stamp: interval=$interval, now=$now, stamp=$stamp, delta=$delta (sec)"
 127
 128     # remove timestamps a day (or more) in the future and force re-check
 129     if [ $stamp -gt $(($now+86400)) ]; then
 130          echo "WARNING: file $stamp_file has a timestamp in the future: $stamp"
 131          rm -f "$stamp_file"
 132          return 0
 133     fi
 134
 135     if [ $delta -ge $interval ]; then
 136         return 0
 137     fi
 138
 139     return 1
 140 }
 141
 142 update_stamp()
 143 {
 144     stamp="$1"
 145     touch $stamp
 146 }
 147
 148 # we check here if autoclean was enough sizewise
 149 check_size_constraints()
 150 {
 151     MaxAge=0
 152     eval $(apt-config shell MaxAge APT::Archives::MaxAge)
 153     eval $(apt-config shell MaxAge APT::Periodic::MaxAge)
 154
 155     MinAge=2
 156     eval $(apt-config shell MinAge APT::Archives::MinAge)
 157     eval $(apt-config shell MinAge APT::Periodic::MinAge)
 158
 159     MaxSize=0
 160     eval $(apt-config shell MaxSize APT::Archives::MaxSize)
 161     eval $(apt-config shell MaxSize APT::Periodic::MaxSize)
 162
 163     Cache="/var/cache/apt/archives/"
 164     eval $(apt-config shell Cache Dir::Cache::archives/d)
 165
 166     # sanity check
 167     if [ -z "$Cache" ]; then
 168         echo "empty Dir::Cache::archives, exiting"
 169         exit
 170     fi
 171
 172     # check age
 173     if [ ! $MaxAge -eq 0 ] && [ ! $MinAge -eq 0 ]; then
 174         debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge and ctime>$MinAge and mtime>$MinAge"
 175         find $Cache -name "*.deb"  \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f
 176     elif [ ! $MaxAge -eq 0 ]; then
 177         debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge only"
 178         find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
 179     else
 180         debug_echo "skip aging since MaxAge is 0"
 181     fi
 182
 183     # check size
 184     if [ ! $MaxSize -eq 0 ]; then
 185         # maxSize is in MB
 186         MaxSize=$(($MaxSize*1024))
 187
 188         #get current time
 189         now=$(date --date=$(date --iso-8601) +%s)
 190         MinAge=$(($MinAge*24*60*60))
 191
 192         # reverse-sort by mtime
 193         for file in $(ls -rt $Cache/*.deb 2>/dev/null); do
 194             du=$(du -s $Cache)
 195             size=${du%%/*}
 196             # check if the cache is small enough
 197             if [ $size -lt $MaxSize ]; then
 198                 debug_echo "end remove by archive size:  size=$size < $MaxSize"
 199                 break
 200             fi
 201
 202             # check for MinAge of the file
 203             if [ $MinAge -ne 0 ]; then
 204                 # check both ctime and mtime
 205                 mtime=$(stat -c %Y $file)
 206                 ctime=$(stat -c %Z $file)
 207                 if [ $mtime -gt $ctime ]; then
 208                     delta=$(($now-$mtime))
 209                 else
 210                     delta=$(($now-$ctime))
 211                 fi
 212                 if [ $delta -le $MinAge ]; then
 213                     debug_echo "skip remove by archive size:  $file, delta=$delta < $MinAge"
 214                     break
 215                 else
 216                     # delete oldest file
 217                     debug_echo "remove by archive size: $file, delta=$delta >= $MinAge (sec), size=$size >= $MaxSize"
 218                     rm -f $file
 219                 fi
 220             fi
 221         done
 222     fi
 223 }
 224
 225 # deal with the Apt::Periodic::BackupArchiveInterval
 226 do_cache_backup()
 227 {
 228     BackupArchiveInterval="$1"
 229     if [ $BackupArchiveInterval -eq 0 ]; then
 230         return
 231     fi
 232
 233     # Set default values and normalize
 234     CacheDir="/var/cache/apt"
 235     eval $(apt-config shell CacheDir Dir::Cache/d)
 236     CacheDir=${CacheDir%/}
 237     if [ -z "$CacheDir" ]; then
 238         debug_echo "practically empty Dir::Cache, exiting"
 239         return 0
 240     fi
 241
 242     Cache="${CacheDir}/archives/"
 243     eval $(apt-config shell Cache Dir::Cache::Archives/d)
 244     if [ -z "$Cache" ]; then
 245         debug_echo "practically empty Dir::Cache::archives, exiting"
 246         return 0
 247     fi
 248
 249     BackupLevel=3
 250     eval $(apt-config shell BackupLevel APT::Periodic::BackupLevel)
 251     if [ $BackupLevel -le 1 ]; then
 252         BackupLevel=2 ;
 253     fi
 254
 255     Back="${CacheDir}/backup/"
 256     eval $(apt-config shell Back Dir::Cache::Backup/d)
 257     if [ -z "$Back" ]; then
 258         echo "practically empty Dir::Cache::Backup, exiting" 1>&2
 259         return
 260     fi
 261
 262     CacheArchive="$(basename "${Cache}")"
 263     test -n "${CacheArchive}" || CacheArchive="archives"
 264     BackX="${Back}${CacheArchive}/"
 265     for x in $(seq 0 1 $((${BackupLevel}-1))); do
 266         eval "Back${x}=${Back}${x}/"
 267     done
 268
 269     # backup after n-days if archive contents changed.
 270     # (This uses hardlink to save disk space)
 271     BACKUP_ARCHIVE_STAMP=/var/lib/apt/periodic/backup-archive-stamp
 272     if check_stamp $BACKUP_ARCHIVE_STAMP $BackupArchiveInterval; then
 273         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
 274             mkdir -p $Back
 275             rm -rf $Back$((${BackupLevel}-1))
 276             for y in $(seq $((${BackupLevel}-1)) -1 1); do
 277                 eval BackY=${Back}$y
 278                 eval BackZ=${Back}$(($y-1))
 279                 if [ -e $BackZ ]; then
 280                     mv -f $BackZ $BackY ;
 281                 fi
 282             done
 283             cp -la $Cache $Back ; mv -f $BackX $Back0
 284             update_stamp $BACKUP_ARCHIVE_STAMP
 285             debug_echo "backup with hardlinks. (success)"
 286         else
 287             debug_echo "skip backup since same content."
 288         fi
 289     else
 290         debug_echo "skip backup since too new."
 291     fi
 292 }
 293
 294 # sleep for a random interval of time (default 30min)
 295 # (some code taken from cron-apt, thanks)
 296 random_sleep()
 297 {
 298     RandomSleep=1800
 299     eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
 300     if [ $RandomSleep -eq 0 ]; then
 301         return
 302     fi
 303     if [ -z "$RANDOM" ] ; then
 304         # A fix for shells that do not have this bash feature.
 305         RANDOM=$(( $(dd if=/dev/urandom bs=2 count=1 2> /dev/null | cksum | cut -d' ' -f1) % 32767 ))
 306     fi
 307     TIME=$(($RANDOM % $RandomSleep))
 308     debug_echo "sleeping for $TIME seconds"
 309     sleep $TIME
 310 }
 311
 312
 313 debug_echo()
 314 {
 315     # Display message if $VERBOSE >= 1
 316     if [ "$VERBOSE" -ge 1 ]; then
 317         echo $1 1>&2
 318     fi
 319 }
 320
 321 check_power(){
 322     # laptop check, on_ac_power returns:
 323     #       0 (true)    System is on main power
 324     #       1 (false)   System is not on main power
 325     #       255 (false) Power status could not be determined
 326     # Desktop systems always return 255 it seems
 327     if command -v on_ac_power >/dev/null 2>&1; then
 328         on_ac_power
 329         POWER=$?
 330         if [ $POWER -eq 1 ]; then
 331             debug_echo "exit: system NOT on main power"
 332             return 1
 333         elif [ $POWER -ne 0 ]; then
 334             debug_echo "power status ($POWER) undetermined, continuing"
 335         fi
 336         debug_echo "system is on main power."
 337     fi
 338     return 0
 339 }
 340
 341 # ------------------------ main ----------------------------
 342
 343 if test -r /var/lib/apt/extended_states; then
 344     # Backup the 7 last versions of APT's extended_states file
 345     # shameless copy from dpkg cron
 346     if cd /var/backups ; then
 347         if ! cmp -s apt.extended_states.0 /var/lib/apt/extended_states; then
 348             cp -p /var/lib/apt/extended_states apt.extended_states
 349             savelog -c 7 apt.extended_states >/dev/null
 350         fi
 351     fi
 352 fi
 353
 354 # check apt-config existence
 355 if ! command -v apt-config >/dev/null 2>&1; then
 356         exit 0
 357 fi
 358
 359 # check if the user really wants to do something
 360 AutoAptEnable=1  # default is yes
 361 eval $(apt-config shell AutoAptEnable APT::Periodic::Enable)
 362
 363 if [ $AutoAptEnable -eq 0 ]; then
 364     exit 0
 365 fi
 366
 367 # Set VERBOSE mode from  apt-config (or inherit from environment)
 368 VERBOSE=0
 369 eval $(apt-config shell VERBOSE APT::Periodic::Verbose)
 370 debug_echo "verbose level $VERBOSE"
 371 if [ "$VERBOSE" -le 2 ]; then
 372     # quiet for 0,1,2
 373     XSTDOUT=">/dev/null"
 374     XSTDERR="2>/dev/null"
 375     XAPTOPT="-qq"
 376     XUUPOPT=""
 377 else
 378     XSTDOUT=""
 379     XSTDERR=""
 380     XAPTOPT=""
 381     XUUPOPT="-d"
 382 fi
 383 if [ "$VERBOSE" -ge 3 ]; then
 384     # trace output
 385     set -x
 386 fi
 387
 388 check_power || exit 0
 389
 390 # check if we can lock the cache and if the cache is clean
 391 if command -v apt-get >/dev/null 2>&1 && ! eval apt-get check $XAPTOPT $XSTDERR ; then
 392     debug_echo "error encountered in cron job with \"apt-get check\"."
 393     exit 0
 394 fi
 395
 396 # Global current time in seconds since 1970-01-01 00:00:00 UTC
 397 now=$(date +%s)
 398
 399 # Support old Archive for compatibility.
 400 # Document only Periodic for all controlling parameters of this script.
 401
 402 UpdateInterval=0
 403 eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists)
 404
 405 DownloadUpgradeableInterval=0
 406 eval $(apt-config shell DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)
 407
 408 UnattendedUpgradeInterval=0
 409 eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)
 410
 411 AutocleanInterval=0
 412 eval $(apt-config shell AutocleanInterval APT::Periodic::AutocleanInterval)
 413
 414 BackupArchiveInterval=0
 415 eval $(apt-config shell BackupArchiveInterval APT::Periodic::BackupArchiveInterval)
 416
 417 Debdelta=1
 418 eval $(apt-config shell Debdelta APT::Periodic::Download-Upgradeable-Packages-Debdelta)
 419
 420 # check if we actually have to do anything that requires locking the cache
 421 if [ $UpdateInterval -eq 0 ] &&
 422    [ $DownloadUpgradeableInterval -eq 0 ] &&
 423    [ $UnattendedUpgradeInterval -eq 0 ] &&
 424    [ $BackupArchiveInterval -eq 0 ] &&
 425    [ $AutocleanInterval -eq 0 ]; then
 426
 427     # check cache size
 428     check_size_constraints
 429
 430     exit 0
 431 fi
 432
 433 # deal with BackupArchiveInterval
 434 do_cache_backup $BackupArchiveInterval
 435
 436 # sleep random amount of time to avoid hitting the
 437 # mirrors at the same time
 438 random_sleep
 439 check_power || exit 0
 440
 441 # include default system language so that "apt-get update" will
 442 # fetch the right translated package descriptions
 443 if [ -r /etc/default/locale ]; then
 444     . /etc/default/locale
 445     export LANG LANGUAGE LC_MESSAGES LC_ALL
 446 fi
 447
 448 # update package lists
 449 UPDATED=0
 450 UPDATE_STAMP=/var/lib/apt/periodic/update-stamp
 451 if check_stamp $UPDATE_STAMP $UpdateInterval; then
 452     if eval apt-get $XAPTOPT -y update $XSTDERR; then
 453         debug_echo "download updated metadata (success)."
 454         if command -v dbus-send >/dev/null 2>&1 && pidof dbus-daemon >/dev/null; then
 455             if dbus-send --system / app.apt.dbus.updated boolean:true ; then
 456                 debug_echo "send dbus signal (success)"
 457             else
 458                 debug_echo "send dbus signal (error)"
 459             fi
 460         else
 461             debug_echo "dbus signal not send (command not available)"
 462         fi
 463         update_stamp $UPDATE_STAMP
 464         UPDATED=1
 465     else
 466         debug_echo "download updated metadata (error)"
 467     fi
 468 else
 469     debug_echo "download updated metadata (not run)."
 470 fi
 471
 472 # download all upgradeable packages (if it is requested)
 473 DOWNLOAD_UPGRADEABLE_STAMP=/var/lib/apt/periodic/download-upgradeable-stamp
 474 if [ $UPDATED -eq 1 ] && check_stamp $DOWNLOAD_UPGRADEABLE_STAMP $DownloadUpgradeableInterval; then
 475     if [ $Debdelta -eq 1 ]; then
 476         debdelta-upgrade >/dev/null 2>&1 || true
 477     fi
 478     if  eval apt-get $XAPTOPT -y -d dist-upgrade $XSTDERR; then
 479         update_stamp $DOWNLOAD_UPGRADEABLE_STAMP
 480         debug_echo "download upgradable (success)"
 481     else
 482         debug_echo "download upgradable (error)"
 483     fi
 484 else
 485     debug_echo "download upgradable (not run)"
 486 fi
 487
 488 # auto upgrade all upgradeable packages
 489 UPGRADE_STAMP=/var/lib/apt/periodic/upgrade-stamp
 490 if command -v unattended-upgrade >/dev/null 2>&1 && check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then
 491     if unattended-upgrade $XUUPOPT; then
 492         update_stamp $UPGRADE_STAMP
 493         debug_echo "unattended-upgrade (success)"
 494     else
 495         debug_echo "unattended-upgrade (error)"
 496     fi
 497 else
 498     debug_echo "unattended-upgrade (not run)"
 499 fi
 500
 501 # autoclean package archive
 502 AUTOCLEAN_STAMP=/var/lib/apt/periodic/autoclean-stamp
 503 if check_stamp $AUTOCLEAN_STAMP $AutocleanInterval; then
 504     if  eval apt-get $XAPTOPT -y autoclean $XSTDERR; then
 505         debug_echo "autoclean (success)."
 506         update_stamp $AUTOCLEAN_STAMP
 507     else
 508         debug_echo "autoclean (error)"
 509     fi
 510 else
 511     debug_echo "autoclean (not run)"
 512 fi
 513
 514 # check cache size
 515 check_size_constraints
 516
 517 #
 518 #     vim: set sts=4 ai :
 519 #
 520