debian/apt.cron.daily

   1 #!/bin/sh
   2 #
   3
   4 #set -e
   5 #
   6 # This file understands the following apt configuration variables:
   7 #
   8 #  "APT::Periodic::Update-Package-Lists=1"
   9 #  - Do "apt-get update" automatically every n-days (0=disable)
  10 #
  11 #  "APT::Periodic::Download-Upgradeable-Packages=0",
  12 #  - Do "apt-get upgrade --download-only" every n-days (0=disable)
  13 #
  14 #  "APT::Periodic::AutocleanInterval"
  15 #  - Do "apt-get autoclean" every n-days (0=disable)
  16 #
  17 #  "APT::Periodic::Unattended-Upgrade"
  18 #  - Run the "unattended-upgrade" security upgrade script
  19 #    every n-days (0=disabled)
  20 #    Requires the package "unattended-upgrades" and will write
  21 #    a log in /var/log/unattended-upgrades
  22 #
  23 #  "APT::Archives::MaxAge",
  24 #  - Set maximum allowed age of a cache package file. If a cache
  25 #    package file is older it is deleted (0=disable)
  26 #
  27 #  "APT::Archives::MaxSize",
  28 #  - Set maximum size of the cache in MB (0=disable). If the cache
  29 #    is bigger, cached package files are deleted until the size
  30 #    requirement is met (the biggest packages will be deleted
  31 #    first).
  32 #
  33 #  "APT::Archives::MinAge"
  34 #  - Set minimum age of a package file. If a file is younger it
  35 #    will not be deleted (0=disable). Usefull to prevent races
  36 #    and to keep backups of the packages for emergency.
  37 #
  38
  39 check_stamp()
  40 {
  41     stamp="$1"
  42     interval="$2"
  43
  44     if [ $interval -eq 0 ]; then
  45         return 1
  46     fi
  47
  48     if [ ! -f $stamp ]; then
  49         return 0
  50     fi
  51
  52     # compare midnight today to midnight the day the stamp was updated
  53     stamp_file="$stamp"
  54     stamp=$(date --date=$(date -r $stamp_file --iso-8601) +%s 2>/dev/null)
  55     if [ "$?" != "0" ]; then
  56         # Due to some timezones returning 'invalid date' for midnight on
  57         # certain dates (eg America/Sao_Paulo), if date returns with error
  58         # remove the stamp file and return 0. See coreutils bug:
  59         # http://lists.gnu.org/archive/html/bug-coreutils/2007-09/msg00176.html
  60         rm -f "$stamp_file"
  61         return 0
  62     fi
  63
  64     now=$(date --date=$(date --iso-8601) +%s 2>/dev/null)
  65     if [ "$?" != "0" ]; then
  66         # As above, due to some timezones returning 'invalid date' for midnight
  67         # on certain dates (eg America/Sao_Paulo), if date returns with error
  68         # return 0.
  69         return 0
  70     fi
  71
  72     delta=$(($now-$stamp))
  73
  74     # intervall is in days,
  75     interval=$(($interval*60*60*24))
  76     #echo "stampfile: $1"
  77     #echo "interval=$interval, now=$now, stamp=$stamp, delta=$delta"
  78
  79     # remove timestamps a day (or more) in the future and force re-check
  80     if [ $stamp -gt $(($now+86400)) ]; then
  81          echo "WARNING: file $stamp_file has a timestamp in the future: $stamp"
  82          rm -f "$stamp_file"
  83          return 0
  84     fi
  85
  86     if [ $delta -ge $interval ]; then
  87         return 0
  88     fi
  89
  90     return 1
  91 }
  92
  93 update_stamp()
  94 {
  95     stamp="$1"
  96
  97     touch $stamp
  98 }
  99
 100
 101
 102 # we check here if autoclean was enough sizewise
 103 check_size_constraints()
 104 {
 105     # min-age in days
 106     MaxAge=0
 107     MinAge=2
 108     MaxSize=0
 109     CacheDir="var/cache/apt"
 110     CacheArchive="archives/"
 111     eval $(apt-config shell MaxAge APT::Archives::MaxAge)
 112     eval $(apt-config shell MinAge APT::Archives::MinAge)
 113     eval $(apt-config shell MaxSize APT::Archives::MaxSize)
 114     eval $(apt-config shell Dir Dir)
 115     eval $(apt-config shell CacheDir Dir::Cache)
 116     eval $(apt-config shell CacheArchive Dir::Cache::archives)
 117
 118     # sanity check
 119     if [ -z "$CacheDir" -o -z "$CacheArchive" ]; then
 120         echo "empty Dir::Cache or Dir::Cache::archives, exiting"
 121         exit
 122     fi
 123
 124     Cache="${Dir%/}/${CacheDir%/}/${CacheArchive%/}/"
 125
 126     # check age
 127     if [ ! $MaxAge -eq 0 ] && [ ! $MinAge -eq 0 ]; then
 128         find $Cache -name "*.deb"  \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f
 129     elif [ ! $MaxAge -eq 0 ]; then
 130         find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
 131     fi
 132
 133     # check size
 134     if [ ! $MaxSize -eq 0 ]; then
 135         # maxSize is in MB
 136         MaxSize=$(($MaxSize*1024))
 137
 138         #get current time
 139         now=$(date --date=$(date --iso-8601) +%s)
 140         MinAge=$(($MinAge*24*60*60))
 141
 142         # reverse-sort by mtime
 143         for file in $(ls -rt $Cache/*.deb 2>/dev/null); do
 144             du=$(du -s $Cache)
 145             size=${du%%/*}
 146             # check if the cache is small enough
 147             if [ $size -lt $MaxSize ]; then
 148                 break
 149             fi
 150
 151             # check for MinAge of the file
 152             if [ ! $MinAge -eq 0 ]; then
 153                 # check both ctime and mtime
 154                 mtime=$(stat -c %Y $file)
 155                 ctime=$(stat -c %Z $file)
 156                 if [ $mtime -gt $ctime ]; then
 157                     delta=$(($now-$mtime))
 158                 else
 159                     delta=$(($now-$ctime))
 160                 fi
 161                 #echo "$file ($delta), $MinAge"
 162                 if [ $delta -le $MinAge ]; then
 163                     #echo "Skiping $file (delta=$delta)"
 164                     break
 165                 fi
 166             fi
 167
 168             # delete oldest file
 169             rm -f $file
 170         done
 171     fi
 172 }
 173
 174 # sleep for a random interval of time (default 30min)
 175 # (some code taken from cron-apt, thanks)
 176 random_sleep()
 177 {
 178     RandomSleep=1800
 179     eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
 180     if [ $RandomSleep -eq 0 ]; then
 181         return
 182     fi
 183     if [ -z "$RANDOM" ] ; then
 184         # A fix for shells that do not have this bash feature.
 185         RANDOM=$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -c"1-5")
 186     fi
 187     TIME=$(($RANDOM % $RandomSleep))
 188     sleep $TIME
 189 }
 190
 191 # main
 192
 193 if ! which apt-config >/dev/null; then
 194         exit 0
 195 fi
 196
 197 UpdateInterval=0
 198 DownloadUpgradeableInterval=0
 199 eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)
 200 AutocleanInterval=$DownloadUpgradeableInterval
 201 eval $(apt-config shell AutocleanInterval APT::Periodic::AutocleanInterval)
 202 UnattendedUpgradeInterval=0
 203 eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)
 204
 205 # check if we actually have to do anything
 206 if [ $UpdateInterval -eq 0 ] &&
 207    [ $DownloadUpgradeableInterval -eq 0 ] &&
 208    [ $UnattendedUpgradeInterval -eq 0 ] &&
 209    [ $AutocleanInterval -eq 0 ]; then
 210     exit 0
 211 fi
 212
 213 # laptop check, on_ac_power returns:
 214 #       0 (true)    System is on mains power
 215 #       1 (false)   System is not on mains power
 216 #       255 (false) Power status could not be determined
 217 # Desktop systems always return 255 it seems
 218 if which on_ac_power >/dev/null; then
 219     on_ac_power
 220     if [ $? -eq 1 ]; then
 221         exit 0
 222     fi
 223 fi
 224
 225 # sleep random amount of time to avoid hitting the
 226 # mirrors at the same time
 227 random_sleep
 228
 229 # check if we can access the cache
 230 if ! apt-get check -q -q 2>/dev/null; then
 231     # wait random amount of time before retrying
 232     random_sleep
 233     # check again
 234     if ! apt-get check -q -q 2>/dev/null; then
 235         echo "$0: could not lock the APT cache while performing daily cron job. "
 236         echo "Is another package manager working?"
 237         exit 1
 238     fi
 239 fi
 240
 241 UPDATE_STAMP=/var/lib/apt/periodic/update-stamp
 242 if check_stamp $UPDATE_STAMP $UpdateInterval; then
 243     if apt-get -qq update 2>/dev/null; then
 244         if which dbus-send >/dev/null && pidof dbus-daemon >/dev/null; then
 245             dbus-send --system / app.apt.dbus.updated boolean:true
 246         fi
 247         update_stamp $UPDATE_STAMP
 248     fi
 249 fi
 250
 251 DOWNLOAD_UPGRADEABLE_STAMP=/var/lib/apt/periodic/download-upgradeable-stamp
 252 if check_stamp $DOWNLOAD_UPGRADEABLE_STAMP $DownloadUpgradeableInterval; then
 253     apt-get -qq -d dist-upgrade 2>/dev/null
 254     update_stamp $DOWNLOAD_UPGRADEABLE_STAMP
 255 fi
 256
 257 UPGRADE_STAMP=/var/lib/apt/periodic/upgrade-stamp
 258 if check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then
 259     unattended-upgrade
 260     update_stamp $UPGRADE_STAMP
 261 fi
 262
 263 AUTOCLEAN_STAMP=/var/lib/apt/periodic/autoclean-stamp
 264 if check_stamp $AUTOCLEAN_STAMP $AutocleanInterval; then
 265     apt-get -qq autoclean
 266     update_stamp $AUTOCLEAN_STAMP
 267 fi
 268
 269 # check cache size
 270 check_size_constraints