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[apt.git] / debian / apt.cron.daily

diff --git a/debian/apt.cron.daily b/debian/apt.cron.daily
index 17fe8fb78658c8b3b71036ed7044396d3d1f3268..778e3cefefb9da48091f95aae9d6db9e91b18b83 100644 (file)
--- a/debian/apt.cron.daily
+++ b/debian/apt.cron.daily
@@ -2,6 +2,39 @@
 #
 
 #set -e
+#
+# This file understands the following apt configuration variables:
+#
+#  "APT::Periodic::Update-Package-Lists=1"
+#  - 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::AutocleanInterval"
+#  - Do "apt-get autoclean" every n-days (0=disable)
+#
+#  "APT::Periodic::Unattended-Upgrade"
+#  - 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::Archives::MaxAge",
+#  - Set maximum allowed age of a cache package file. If a cache 
+#    package file is older it is deleted (0=disable)
+#
+#  "APT::Archives::MaxSize",
+#  - 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::Archives::MinAge"
+#  - 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.
+# 
 
 check_stamp()
 {
@@ -20,7 +53,11 @@ check_stamp()
     stamp=$(date --date=$(date -r $stamp --iso-8601) +%s)
     now=$(date --date=$(date --iso-8601) +%s)
     delta=$(($now-$stamp))
-    echo "stamp=$stamp, now=$now, delta=$delta"
+
+    # intervall is in days,
+    interval=$(($interval*60*60*24))
+    #echo "stampfile: $1"
+    #echo "interval=$interval, now=$now, stamp=$stamp, delta=$delta"
 
     if [ $delta -ge $interval ]; then
         return 0
@@ -36,11 +73,90 @@ update_stamp()
     touch $stamp
 }
 
+
+
+# we check here if autoclean was enough sizewise
+check_size_constraints()
+{
+    # min-age in days
+    MaxAge=0
+    MinAge=2
+    MaxSize=0
+    CacheDir="var/cache/apt"
+    CacheArchive="archives/"
+    eval $(apt-config shell MaxAge APT::Archives::MaxAge)
+    eval $(apt-config shell MinAge APT::Archives::MinAge)
+    eval $(apt-config shell MaxSize APT::Archives::MaxSize)
+    eval $(apt-config shell Dir Dir)
+    eval $(apt-config shell CacheDir Dir::Cache)
+    eval $(apt-config shell CacheArchive Dir::Cache::archives)
+
+    # sanity check
+    if [ -z "$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
+       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
+       find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
+    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
+               break
+           fi
+
+           # check for MinAge of the file
+           if [ ! $MinAge -eq 0 ]; then 
+               # check both ctime and mtime 
+               mtime=$(stat -c %Y $file)
+               ctime=$(stat -c %Z $file)
+               if [ $mtime -gt $ctime ]; then
+                   delta=$(($now-$mtime))
+               else
+                   delta=$(($now-$ctime))
+               fi
+               #echo "$file ($delta), $MinAge"
+               if [ $delta -le $MinAge ]; then
+                   #echo "Skiping $file (delta=$delta)"
+                   break
+               fi
+           fi
+
+           # delete oldest file
+           rm -f $file
+       done
+    fi
+}
+
+
 UpdateInterval=0
 DownloadUpgradeableInterval=0
 eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)
 AutocleanInterval=$DownloadUpgradeableInterval
-eval $(apt-config shell AutocleanInterval APT::Periodic::Autoclean)
+eval $(apt-config shell AutocleanInterval APT::Periodic::AutocleanInterval)
+
+UnattendedUpgradeInterval=0
+eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)
+
 
 # laptop check, on_ac_power returns:
 #       0 (true)    System is on mains power
@@ -75,3 +191,12 @@ if check_stamp $AUTOCLEAN_STAMP $AutocleanInterval; then
     apt-get -qq autoclean
     update_stamp $AUTOCLEAN_STAMP
 fi
+
+UPGRADE_STAMP=/var/lib/apt/periodic/upgrade-stamp
+if check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then
+    unattended-upgrade
+    update_stamp $UPGRADE_STAMP
+fi
+
+# check cache size 
+check_size_constraints