X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/549da1a850f0fd50e0a55415452ecaa735d49451..651001f7501431b75e967ba060160129d5a7ed74:/debian/apt.cron.daily

diff --git a/debian/apt.cron.daily b/debian/apt.cron.daily
index 1ca830c93..32fbafc57 100644
--- a/debian/apt.cron.daily
+++ b/debian/apt.cron.daily
@@ -147,7 +147,7 @@ check_size_constraints()
     fi
 }
 
-# sleep for a random intervall of time (default 30min)
+# sleep for a random interval of time (default 30min)
 # (some code taken from cron-apt, thanks)
 random_sleep()
 {
@@ -175,10 +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
@@ -192,27 +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
-# There's a reasonable chance that someone is already running an apt
-# frontend that has locked the cache, so exit quietly if it is locked.
-if ! apt-get check -q -q 2>/dev/null; then
-    exit 0
-fi
-
-# sleep random amount of time
+# sleep random amount of time to avoid hitting the 
+# mirrors at the same time
 random_sleep
 
-# check again if we can access the cache
+# check if we can access the cache
 if ! apt-get check -q -q 2>/dev/null; then
-    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