fix documentation for APT::Periodic::MaxSize "0" (closes: #740551)

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

diff --git a/debian/apt.cron.daily b/debian/apt.cron.daily
index c61bfb9bb3cd0f7c885f6eca09f13b002d694be2..d949e303a6d4728bb5acc4b514445741581d6d0c 100644 (file)
--- a/debian/apt.cron.daily
+++ b/debian/apt.cron.daily
@@ -8,7 +8,7 @@
 #  Dir "/";
 #  - RootDir for all configuration files
 #
-#  Dir::Cache "var/apt/cache/";
+#  Dir::Cache "var/cache/apt/";
 #  - Set apt package cache directory
 #
 #  Dir::Cache::Archives "archives/";
@@ -34,14 +34,14 @@
 #  APT::Archives::MinAge "2"; (old, deprecated)
 #  APT::Periodic::MinAge "2"; (new)
 #  - Set minimum age of a package file. If a file is younger it
-#    will not be deleted (0=disable). Usefull to prevent races 
+#    will not be deleted (0=disable). Useful to prevent races
 #    and to keep backups of the packages for emergency.
 #
 #  APT::Archives::MaxSize "0"; (old, deprecated)
 #  APT::Periodic::MaxSize "0"; (new)
 #  - 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 
+#    requirement is met (the oldest packages will be deleted 
 #    first).
 #
 #  APT::Periodic::Update-Package-Lists "0";
@@ -197,11 +197,11 @@ check_size_constraints()
                    delta=$(($now-$ctime))
                fi
                if [ $delta -le $MinAge ]; then
-                   debug_echo "skip remove by archive size:  $file, delta=$delta < $MinAgeSec"
+                   debug_echo "skip remove by archive size:  $file, delta=$delta < $MinAge"
                    break
                else
                    # delete oldest file
-                   debug_echo "remove by archive size: $file, delta=$delta >= $MinAgeSec (sec), size=$size >= $MaxSize"
+                   debug_echo "remove by archive size: $file, delta=$delta >= $MinAge (sec), size=$size >= $MaxSize"
                    rm -f $file
                fi
            fi
@@ -289,7 +289,7 @@ random_sleep()
     fi
     if [ -z "$RANDOM" ] ; then
         # A fix for shells that do not have this bash feature.
-       RANDOM=$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -c"1-5")
+       RANDOM=$(( $(dd if=/dev/urandom bs=2 count=1 2> /dev/null | cksum | cut -d' ' -f1) % 32767 ))
     fi
     TIME=$(($RANDOM % $RandomSleep))
     debug_echo "sleeping for $TIME seconds"
@@ -305,14 +305,36 @@ debug_echo()
     fi
 }
 
+check_power(){
+    # laptop check, on_ac_power returns:
+    #       0 (true)    System is on main power
+    #       1 (false)   System is not on main power
+    #       255 (false) Power status could not be determined
+    # Desktop systems always return 255 it seems
+    if which on_ac_power >/dev/null; then
+        on_ac_power
+        POWER=$?
+        if [ $POWER -eq 1 ]; then
+           debug_echo "exit: system NOT on main power"
+           return 1
+        elif [ $POWER -ne 0 ]; then
+           debug_echo "power status ($POWER) undetermined, continuing"
+        fi
+        debug_echo "system is on main power."
+    fi
+    return 0
+}
+
 # ------------------------ main ----------------------------
 
-# Backup the 7 last versions of APT's extended_states file
-# shameless copy from dpkg cron
-if cd /var/backups ; then
-    if ! cmp -s apt.extended_states.0 /var/lib/apt/extended_states; then
-       cp -p /var/lib/apt/extended_states apt.extended_states
-       savelog -c 7 apt.extended_states >/dev/null
+if test -r /var/lib/apt/extended_states; then
+    # Backup the 7 last versions of APT's extended_states file
+    # shameless copy from dpkg cron
+    if cd /var/backups ; then
+       if ! cmp -s apt.extended_states.0 /var/lib/apt/extended_states; then
+           cp -p /var/lib/apt/extended_states apt.extended_states
+           savelog -c 7 apt.extended_states >/dev/null
+       fi
     fi
 fi
 
@@ -350,25 +372,10 @@ if [ "$VERBOSE" -ge 3 ]; then
     set -x
 fi
 
-# laptop check, on_ac_power returns:
-#       0 (true)    System is on main power
-#       1 (false)   System is not on main power
-#       255 (false) Power status could not be determined
-# Desktop systems always return 255 it seems
-if which on_ac_power >/dev/null; then
-    on_ac_power
-    POWER=$?
-    if [ $POWER -eq 1 ]; then
-       debug_echo "exit: system NOT on main power"
-       exit 0
-    elif [ $POWER -ne 0 ]; then
-       debug_echo "power status ($POWER) undetermined, continuing"
-    fi
-    debug_echo "system is on main power."
-fi
+check_power || exit 0
 
 # check if we can lock the cache and if the cache is clean
-if which apt-get >/dev/null && ! eval apt-get check -f $XAPTOPT $XSTDERR ; then
+if which apt-get >/dev/null && ! eval apt-get check $XAPTOPT $XSTDERR ; then
     debug_echo "error encountered in cron job with \"apt-get check\"."
     exit 0
 fi
@@ -377,7 +384,7 @@ fi
 now=$(date +%s)
 
 # Support old Archive for compatibility.
-# Document only Periodic for all controling parameters of this script.
+# Document only Periodic for all controlling parameters of this script.
 
 UpdateInterval=0
 eval $(apt-config shell UpdateInterval APT::Periodic::Update-Package-Lists)
@@ -416,6 +423,7 @@ do_cache_backup $BackupArchiveInterval
 # sleep random amount of time to avoid hitting the 
 # mirrors at the same time
 random_sleep
+check_power || exit 0
 
 # include default system language so that "apt-get update" will
 # fetch the right translated package descriptions
@@ -466,7 +474,7 @@ fi
 
 # auto upgrade all upgradeable packages
 UPGRADE_STAMP=/var/lib/apt/periodic/upgrade-stamp
-if [ $UPDATED -eq 1 ] && which unattended-upgrade >/dev/null && check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then
+if which unattended-upgrade >/dev/null && check_stamp $UPGRADE_STAMP $UnattendedUpgradeInterval; then
     if unattended-upgrade $XUUPOPT; then
        update_stamp $UPGRADE_STAMP
        debug_echo "unattended-upgrade (success)"