+# Global current time in seconds since 1970-01-01 00:00:00 UTC
+now=$(date +%s)
+
+# Set default values and normalize
+Dir="/"
+eval $(apt-config shell Dir Dir)
+Dir=${Dir%/}
+
+CacheDir="var/cache/apt/"
+eval $(apt-config shell CacheDir Dir::Cache)
+CacheDir=${CacheDir%/}
+if [ -z "$CacheDir" ]; then
+ debug_echo "practically empty Dir::Cache, exiting"
+ exit 0
+fi
+
+CacheArchive="archives/"
+eval $(apt-config shell CacheArchive Dir::Cache::Archives)
+CacheArchive=${CacheArchive%/}
+if [ -z "$CacheArchive" ]; then
+ debug_echo "practically empty Dir::Cache::archives, exiting"
+ exit 0
+fi
+
+BackupArchiveInterval=0
+eval $(apt-config shell BackupArchiveInterval APT::Periodic::BackupArchiveInterval)
+
+BackupLevel=3
+eval $(apt-config shell BackupLevel APT::Periodic::BackupLevel)
+if [ $BackupLevel -le 1 ]; then BackupLevel=2 ; fi
+
+CacheBackup="backup/"
+eval $(apt-config shell CacheBackup Dir::Cache::Backup)
+CacheBackup=${CacheBackup%/}
+if [ -z "$CacheBackup" ]; then
+ echo "practically empty Dir::Cache::Backup, exiting" 1>&2
+ exit 0
+fi
+
+# Support old Archive for compatibility.
+# Document only Periodic for all controling parameters of this script.
+MaxAge=0
+eval $(apt-config shell MaxAge APT::Archives::MaxAge)
+eval $(apt-config shell MaxAge APT::Periodic::MaxAge)
+
+MinAge=2
+eval $(apt-config shell MinAge APT::Archives::MinAge)
+eval $(apt-config shell MinAge APT::Periodic::MinAge)
+
+MaxSize=0
+eval $(apt-config shell MaxSize APT::Archives::MaxSize)
+eval $(apt-config shell MaxSize APT::Periodic::MaxSize)
+
+UpdateInterval=0
+eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists)
+
+DownloadUpgradeableInterval=0
+eval $(apt-config shell DownloadUpgradeableInterval APT::Periodic::Download-Upgradeable-Packages)
+
+UnattendedUpgradeInterval=0
+eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)
+
+AutocleanInterval=0
+eval $(apt-config shell AutocleanInterval APT::Periodic::AutocleanInterval)
+
+Cache="${Dir}/${CacheDir}/${CacheArchive}/"
+Back="${Dir}/${CacheDir}/${CacheBackup}/"
+BackX="${Back}${CacheArchive}/"
+for x in $(seq 0 1 $((${BackupLevel}-1))); do
+ eval "Back${x}=${Back}${x}/"
+done
+
+# check if we actually have to do anything
+if [ $UpdateInterval -eq 0 ] &&
+ [ $DownloadUpgradeableInterval -eq 0 ] &&
+ [ $UnattendedUpgradeInterval -eq 0 ] &&
+ [ $BackupArchiveInterval -eq 0 ] &&
+ [ $AutocleanInterval -eq 0 ]; then
+ exit 0
+fi
+
+
+# backup after n-days if archive contents changed.
+# (This uses hardlink to save disk space)
+BACKUP_ARCHIVE_STAMP=/var/lib/apt/periodic/backup-archive-stamp
+if check_stamp $BACKUP_ARCHIVE_STAMP $BackupArchiveInterval; then
+ 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
+ mkdir -p $Back
+ rm -rf $Back$((${BackupLevel}-1))
+ for y in $(seq $((${BackupLevel}-1)) -1 1); do
+ eval BackY=${Back}$y
+ eval BackZ=${Back}$(($y-1))
+ if [ -e $BackZ ]; then mv -f $BackZ $BackY ; fi
+ done
+ cp -la $Cache $Back ; mv -f $BackX $Back0
+ update_stamp $BACKUP_ARCHIVE_STAMP
+ debug_echo "backup with hardlinks. (success)"
+ else
+
+ debug_echo "skip backup since same content."
+ fi
+else
+ debug_echo "skip backup since too new."
+fi
+
+# package archive contnts removal by package age
+if [ $MaxAge -ne 0 ] && [ $MinAge -ne 0 ]; then
+ find $Cache -name "*.deb" \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f
+ debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge and ctime>$MinAge and mtime>$MinAge"
+elif [ $MaxAge -ne 0 ]; then
+ find $Cache -name "*.deb" -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
+ debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge only"
+else
+ debug_echo "skip aging since MaxAge is 0"
+fi
+
+# package archive contnts removal down to $MaxSize
+if [ $MaxSize -ne 0 ]; then
+
+ MinAgeSec=$(($MinAge*24*60*60))
+
+ # reverse-sort by mtime
+ for file in $(ls -rt $Cache/*.deb 2>/dev/null); do
+ du=$(du -m -s $Cache)
+ size=${du%%/*}
+ # check if the cache is small enough
+ if [ $size -lt $MaxSize ]; then
+ debug_echo "end remove by archive size: size=$size < $MaxSize"
+ break
+ fi
+
+ # check for MinAge in second of the file
+ if [ $MinAgeSec -ne 0 ]; then
+ # check both ctime and mtime
+ mtime=$(stat -c %Y $file)
+ ctime=$(stat -c %Z $file)
+ if [ $mtime -gt $ctime ]; then
+ delta=$(($now-$mtime))
+ else
+ delta=$(($now-$ctime))
+ fi
+ if [ $delta -le $MinAgeSec ]; then
+ debug_echo "skip remove by archive size: $file, delta=$delta < $MinAgeSec"
+ else
+ # delete oldest file
+ debug_echo "remove by archive size: $file, delta=$delta >= $MinAgeSec (sec), size=$size >= $MaxSize"
+ rm -f $file
+ fi
+ fi
+
+ done
+fi
+
+# update package lists
projects / apt.git / blobdiff