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::Archives::MaxAge",
  18 #  - Set maximum allowed age of a cache package file. If a cache
  19 #    package file is older it is deleted (0=disable)
  20 #
  21 #  "APT::Archives::MaxSize",
  22 #  - Set maximum size of the cache in MB (0=disable). If the cache
  23 #    is bigger, cached package files are deleted until the size
  24 #    requirement is met (the biggest packages will be deleted
  25 #    first).
  26 #
  27 #  "APT::Archives::MinAge"
  28 #  - Set minimum age of a package file. If a file is younger it
  29 #    will not be deleted (0=disable). Usefull to prevent races
  30 #    and to keep backups of the packages for emergency.
  31 #
  32
  33 check_stamp()
  34 {
  35     stamp="$1"
  36     interval="$2"
  37
  38     if [ $interval -eq 0 ]; then
  39         return 1
  40     fi
  41
  42     if [ ! -f $stamp ]; then
  43         return 0
  44     fi
  45
  46     # compare midnight today to midnight the day the stamp was updated
  47     stamp=$(date --date=$(date -r $stamp --iso-8601) +%s)
  48     now=$(date --date=$(date --iso-8601) +%s)
  49     delta=$(($now-$stamp))
  50
  51     # intervall is in days,
  52     interval=$(($interval*60*60*24))
  53     #echo "stampfile: $1"
  54     #echo "interval=$interval, now=$now, stamp=$stamp, delta=$delta"
  55
  56     if [ $delta -ge $interval ]; then
  57         return 0
  58     fi
  59
  60     return 1
  61 }
  62
  63 update_stamp()
  64 {
  65     stamp="$1"
  66
  67     touch $stamp
  68 }
  69
  70
  71
  72 # we check here if autoclean was enough sizewise
  73 check_size_constraints()
  74 {
  75     # min-age in days
  76     MaxAge=0
  77     MinAge=2
  78     MaxSize=0
  79     CacheDir="var/cache/apt"
  80     CacheArchive="archives/"
  81     eval $(apt-config shell MaxAge APT::Archives::MaxAge)
  82     eval $(apt-config shell MinAge APT::Archives::MinAge)
  83     eval $(apt-config shell MaxSize APT::Archives::MaxSize)
  84     eval $(apt-config shell Dir Dir)
  85     eval $(apt-config shell CacheDir Dir::Cache)
  86     eval $(apt-config shell CacheArchive Dir::Cache::archives)
  87
  88     # sanity check
  89     if [ -z "$CacheDir" -o -z "$CacheArchive" ]; then
  90         echo "empty Dir::Cache or Dir::Cache::archives, exiting"
  91         exit
  92     fi
  93
  94     Cache="${Dir%/}/${CacheDir%/}/${CacheArchive%/}/"
  95
  96     # check age
  97     if [ ! $MaxAge -eq 0 ] && [ ! $MinAge -eq 0 ]; then
  98         find $Cache -name "*.deb"  \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f
  99     elif [ ! $MaxAge -eq 0 ]; then
 100         find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
 101     fi
 102
 103     # check size
 104     if [ ! $MaxSize -eq 0 ]; then
 105         # maxSize is in MB
 106         MaxSize=$(($MaxSize*1024))
 107
 108         #get current time
 109         now=$(date --date=$(date --iso-8601) +%s)
 110         MinAge=$(($MinAge*24*60*60))
 111
 112         # reverse-sort by mtime
 113         for file in $(ls -rt $Cache/*.deb 2>/dev/null); do
 114             du=$(du -s $Cache)
 115             size=${du%%/*}
 116             # check if the cache is small enough
 117             if [ $size -lt $MaxSize ]; then
 118                 break
 119             fi
 120
 121             # check for MinAge of the file
 122             if [ ! $MinAge -eq 0 ]; then
 123                 # check both ctime and mtime
 124                 mtime=$(stat -c %Y $file)
 125                 ctime=$(stat -c %Z $file)
 126                 if [ $mtime -gt $ctime ]; then
 127                     delta=$(($now-$mtime))
 128                 else
 129                     delta=$(($now-$ctime))
 130                 fi
 131                 #echo "$file ($delta), $MinAge"
 132                 if [ $delta -le $MinAge ]; then
 133                     #echo "Skiping $file (delta=$delta)"
 134                     break
 135                 fi
 136             fi
 137
 138             # delete oldest file
 139             rm -f $file
 140         done
 141     fi
 142 }
 143
 144
 145 UpdateInterval=0
 146 DownloadUpgradeableInterval=0
 147 eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)
 148 AutocleanInterval=$DownloadUpgradeableInterval
 149 eval $(apt-config shell AutocleanInterval APT::Periodic::Autoclean)
 150
 151 # laptop check, on_ac_power returns:
 152 #       0 (true)    System is on mains power
 153 #       1 (false)   System is not on mains power
 154 #       255 (false) Power status could not be determined
 155 # Desktop systems always return 255 it seems
 156 if which on_ac_power >/dev/null; then
 157     on_ac_power
 158     if [ $? -eq 1 ]; then
 159         exit 0
 160     fi
 161 fi
 162
 163 UPDATE_STAMP=/var/lib/apt/periodic/update-stamp
 164 if check_stamp $UPDATE_STAMP $UpdateInterval; then
 165     if apt-get -qq update 2>/dev/null; then
 166         if which dbus-send >/dev/null; then
 167             dbus-send --system / app.apt.dbus.updated boolean:true
 168         fi
 169         update_stamp $UPDATE_STAMP
 170     fi
 171 fi
 172
 173 DOWNLOAD_UPGRADEABLE_STAMP=/var/lib/apt/periodic/download-upgradeable-stamp
 174 if check_stamp $DOWNLOAD_UPGRADEABLE_STAMP $DownloadUpgradeableInterval; then
 175     apt-get -qq -d dist-upgrade 2>/dev/null
 176     update_stamp $DOWNLOAD_UPGRADEABLE_STAMP
 177 fi
 178
 179 AUTOCLEAN_STAMP=/var/lib/apt/periodic/autoclean-stamp
 180 if check_stamp $AUTOCLEAN_STAMP $AutocleanInterval; then
 181     apt-get -qq autoclean
 182     update_stamp $AUTOCLEAN_STAMP
 183 fi
 184
 185 # check cache size
 186 check_size_constraints