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     if [ $delta -ge $interval ]; then
  80         return 0
  81     fi
  82
  83     return 1
  84 }
  85
  86 update_stamp()
  87 {
  88     stamp="$1"
  89
  90     touch $stamp
  91 }
  92
  93
  94
  95 # we check here if autoclean was enough sizewise
  96 check_size_constraints()
  97 {
  98     # min-age in days
  99     MaxAge=0
 100     MinAge=2
 101     MaxSize=0
 102     CacheDir="var/cache/apt"
 103     CacheArchive="archives/"
 104     eval $(apt-config shell MaxAge APT::Archives::MaxAge)
 105     eval $(apt-config shell MinAge APT::Archives::MinAge)
 106     eval $(apt-config shell MaxSize APT::Archives::MaxSize)
 107     eval $(apt-config shell Dir Dir)
 108     eval $(apt-config shell CacheDir Dir::Cache)
 109     eval $(apt-config shell CacheArchive Dir::Cache::archives)
 110
 111     # sanity check
 112     if [ -z "$CacheDir" -o -z "$CacheArchive" ]; then
 113         echo "empty Dir::Cache or Dir::Cache::archives, exiting"
 114         exit
 115     fi
 116
 117     Cache="${Dir%/}/${CacheDir%/}/${CacheArchive%/}/"
 118
 119     # check age
 120     if [ ! $MaxAge -eq 0 ] && [ ! $MinAge -eq 0 ]; then
 121         find $Cache -name "*.deb"  \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f
 122     elif [ ! $MaxAge -eq 0 ]; then
 123         find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
 124     fi
 125
 126     # check size
 127     if [ ! $MaxSize -eq 0 ]; then
 128         # maxSize is in MB
 129         MaxSize=$(($MaxSize*1024))
 130
 131         #get current time
 132         now=$(date --date=$(date --iso-8601) +%s)
 133         MinAge=$(($MinAge*24*60*60))
 134
 135         # reverse-sort by mtime
 136         for file in $(ls -rt $Cache/*.deb 2>/dev/null); do
 137             du=$(du -s $Cache)
 138             size=${du%%/*}
 139             # check if the cache is small enough
 140             if [ $size -lt $MaxSize ]; then
 141                 break
 142             fi
 143
 144             # check for MinAge of the file
 145             if [ ! $MinAge -eq 0 ]; then
 146                 # check both ctime and mtime
 147                 mtime=$(stat -c %Y $file)
 148                 ctime=$(stat -c %Z $file)
 149                 if [ $mtime -gt $ctime ]; then
 150                     delta=$(($now-$mtime))
 151                 else
 152                     delta=$(($now-$ctime))
 153                 fi
 154                 #echo "$file ($delta), $MinAge"
 155                 if [ $delta -le $MinAge ]; then
 156                     #echo "Skiping $file (delta=$delta)"
 157                     break
 158                 fi
 159             fi
 160
 161             # delete oldest file
 162             rm -f $file
 163         done
 164     fi
 165 }
 166
 167 # sleep for a random interval of time (default 30min)
 168 # (some code taken from cron-apt, thanks)
 169 random_sleep()
 170 {
 171     RandomSleep=1800
 172     eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
 173     if [ $RandomSleep -eq 0 ]; then
 174         return
 175     fi
 176     if [ -z "$RANDOM" ] ; then
 177         # A fix for shells that do not have this bash feature.
 178         RANDOM=$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -c"1-5")
 179     fi
 180     TIME=$(($RANDOM % $RandomSleep))
 181     sleep $TIME
 182 }
 183
 184 # main
 185
 186 if ! which apt-config >/dev/null; then
 187         exit 0
 188 fi
 189
 190 UpdateInterval=0
 191 DownloadUpgradeableInterval=0
 192 eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)
 193 AutocleanInterval=$DownloadUpgradeableInterval
 194 eval $(apt-config shell AutocleanInterval APT::Periodic::AutocleanInterval)
 195 UnattendedUpgradeInterval=0
 196 eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)
 197
 198 # check if we actually have to do anything
 199 if [ $UpdateInterval -eq 0 ] &&
 200    [ $DownloadUpgradeableInterval -eq 0 ] &&
 201    [ $UnattendedUpgradeInterval -eq 0 ] &&
 202    [ $AutocleanInterval -eq 0 ]; then
 203     exit 0
 204 fi
 205
 206 # laptop check, on_ac_power returns:
 207 #       0 (true)    System is on mains power
 208 #       1 (false)   System is not on mains power
 209 #       255 (false) Power status could not be determined
 210 # Desktop systems always return 255 it seems
 211 if which on_ac_power >/dev/null; then
 212     on_ac_power
 213     if [ $? -eq 1 ]; then
 214         exit 0
 215     fi
 216 fi
 217
 218 # sleep random amount of time to avoid hitting the
 219 # mirrors at the same time
 220 random_sleep
 221
 222 # check if we can access the cache
 223 if ! apt-get check -q -q 2>/dev/null; then
 224     # wait random amount of time before retrying
 225     random_sleep
 226     # check again
 227     if ! apt-get check -q -q 2>/dev/null; then
 228         echo "$0: could not lock the APT cache while performing daily cron job. "
 229         echo "Is another package manager working?"
 230         exit 1
 231     fi
 232 fi
 233
 234 UPDATE_STAMP=/var/lib/apt/periodic/update-stamp
 235 if check_stamp $UPDATE_STAMP $UpdateInterval; then
 236     if apt-get -qq update 2>/dev/null; then
 237         if which dbus-send >/dev/null && pidof dbus-daemon >/dev/null; then
 238             dbus-send --system / app.apt.dbus.updated boolean:true
 239         fi
 240         update_stamp $UPDATE_STAMP
 241     fi
 242 fi
 243
 244 DOWNLOAD_UPGRADEABLE_STAMP=/var/lib/apt/periodic/download-upgradeable-stamp
 245 if check_stamp $DOWNLOAD_UPGRADEABLE_STAMP $DownloadUpgradeableInterval; then
 246     apt-get -qq -d dist-upgrade 2>/dev/null
 247     update_stamp $DOWNLOAD_UPGRADEABLE_STAMP
 248 fi
 249
 250 UPGRADE_STAMP=/var/lib/apt/periodic/upgrade-stamp
 251 if check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then
 252     unattended-upgrade
 253     update_stamp $UPGRADE_STAMP
 254 fi
 255
 256 AUTOCLEAN_STAMP=/var/lib/apt/periodic/autoclean-stamp
 257 if check_stamp $AUTOCLEAN_STAMP $AutocleanInterval; then
 258     apt-get -qq autoclean
 259     update_stamp $AUTOCLEAN_STAMP
 260 fi
 261
 262 # check cache size
 263 check_size_constraints