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

diff --git a/debian/apt.cron.daily b/debian/apt.cron.daily
index 7af689e1f670474dc7a93706538ca78759ec69f0..32fbafc57cfb037d0bdeb9e7348942493181efca 100644 (file)
--- a/debian/apt.cron.daily
+++ b/debian/apt.cron.daily
@@ -147,6 +147,25 @@ check_size_constraints()
     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))
+    sleep $TIME
+}
+
+# main
+
 if ! which apt-config >/dev/null; then
        exit 0
 fi
@@ -156,10 +175,16 @@ 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::AutocleanInterval)
-
 UnattendedUpgradeInterval=0
 eval $(apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade)
 
+# check if we actually have to do anything
+if [ $UpdateInterval -eq 0 ] &&
+   [ $DownloadUpgradeableInterval -eq 0 ] &&
+   [ $UnattendedUpgradeInterval -eq 0 ] &&
+   [ $AutocleanInterval -eq 0 ]; then
+    exit 0
+fi
 
 # laptop check, on_ac_power returns:
 #       0 (true)    System is on mains power
@@ -173,19 +198,28 @@ if which on_ac_power >/dev/null; then
     fi
 fi
 
-# check if we can lock the cache and if the cache is clean
+# sleep random amount of time to avoid hitting the 
+# mirrors at the same time
+random_sleep
+
+# check if we can access the cache
 if ! apt-get check -q -q 2>/dev/null; then
-    echo "$0: could not lock the APT cache"
-    exit 1
+    # wait random amount of time before retrying
+    random_sleep
+    # check again
+    if ! apt-get check -q -q 2>/dev/null; then
+       echo "$0: could not lock the APT cache while performing daily cron job. "
+       echo "Is another package manager working?"
+       exit 1
+    fi
 fi
 
-
 UPDATE_STAMP=/var/lib/apt/periodic/update-stamp
 if check_stamp $UPDATE_STAMP $UpdateInterval; then
     if apt-get -qq update 2>/dev/null; then
-       if which dbus-send >/dev/null; then
-           dbus-send --system / app.apt.dbus.updated boolean:true
-       fi
+        if which dbus-send >/dev/null && pidof dbus-daemon >/dev/null; then
+            dbus-send --system / app.apt.dbus.updated boolean:true
+        fi
         update_stamp $UPDATE_STAMP
     fi
 fi