+ CacheDir="var/cache/apt/"
+ eval $(apt-config shell CacheDir Dir::Cache)
+ CacheDir=${CacheDir%/}
+ if [ -z "$CacheDir" ]; then
+ debug_echo "practically empty Dir::Cache, exiting"
+ return 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"
+ return 0
+ fi
+
+ 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 "$CacheBackup" ]; then
+ echo "practically empty Dir::Cache::Backup, exiting" 1>&2
+ return
+ fi
+
+ Cache="${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
+
+ # 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
+}
+
+# sleep for a random interval of time (default 30min)
+# (some code taken from cron-apt, thanks)
+random_sleep()
+{
+ RandomSleep=1800
+ eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
+ if [ $RandomSleep -eq 0 ]; then
+ return
+ fi
+ if [ -z "$RANDOM" ] ; then
+ # A fix for shells that do not have this bash feature.
+ RANDOM=$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -c"1-5")
+ fi
+ TIME=$(($RANDOM % $RandomSleep))
+ debug_echo "sleeping for $TIME seconds"
+ sleep $TIME
+}
+
+
+debug_echo()
+{
+ # Display message if $VERBOSE >= 1
+ if [ "$VERBOSE" -ge 1 ]; then
+ echo $1 1>&2
+ fi
+}
+
+# ------------------------ main ----------------------------
+
+# check apt-config exstance
+if ! which apt-config >/dev/null ; then
+ exit 0
+fi
projects / apt.git / blobdiff