From 5f71505b4f885ecd045c6fe40598e22ef9f328b7 Mon Sep 17 00:00:00 2001
From: Michael Vogt <michael.vogt@ubuntu.com>
Date: Mon, 30 Mar 2009 14:00:00 +0200
Subject: merge fix for cache locking from debian (closes: #459344)

---
 debian/apt.cron.daily | 37 ++++++++++++++++++-------------------
 debian/changelog      |  1 +
 2 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/debian/apt.cron.daily b/debian/apt.cron.daily
index bb72780a5..d980efd7d 100644
--- a/debian/apt.cron.daily
+++ b/debian/apt.cron.daily
@@ -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
@@ -192,19 +198,20 @@ 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
 
 # set the proxy based on the admin users gconf settings
@@ -218,14 +225,6 @@ if [ -n "$admin_user" ] && [ -x /usr/bin/sudo ] && [ -z "$http_proxy" ] && [ -x
 	fi
 fi
 
-# sleep random amount of time
-random_sleep
-
-# check again if we can access the cache
-if ! apt-get check -q -q 2>/dev/null; then
-    exit 1
-fi
-
 UPDATE_STAMP=/var/lib/apt/periodic/update-stamp
 if check_stamp $UPDATE_STAMP $UpdateInterval; then
     # check for a new archive signing key (against the master keyring)
diff --git a/debian/changelog b/debian/changelog
index 62ce48ed9..f03be0cd5 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -9,6 +9,7 @@ apt (0.7.20.2ubuntu5) jaunty; urgency=low
   * debian/apt.cron.daily:
     - do not clutter cron mail with bogus gconftool messages 
       (LP: #223502)
+    - merge fix for cache locking from debian (closes: #459344)
 
  -- Michael Vogt <michael.vogt@ubuntu.com>  Mon, 30 Mar 2009 13:22:28 +0200
 
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