From fc128fd4b1e153273aff366d6ce9f75c2b992c40 Mon Sep 17 00:00:00 2001
From: Carl N Baldwin <cnb@hpsvcnb.fc.hp.com>
Date: Mon, 31 Oct 2005 10:22:36 -0700
Subject: [PATCH] Set nice value and detach from cron

---
 scripts/burn-imgs.sh              |  9 +++++++++
 scripts/cron-burn.sh              | 10 ++++++++++
 scripts/{cron.sh => cron-pack.sh} |  3 ++-
 3 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100755 scripts/cron-burn.sh
 rename scripts/{cron.sh => cron-pack.sh} (90%)

diff --git a/scripts/burn-imgs.sh b/scripts/burn-imgs.sh
index 2be9e0a..b4d71bf 100755
--- a/scripts/burn-imgs.sh
+++ b/scripts/burn-imgs.sh
@@ -2,6 +2,7 @@
 
 export PATH=$(dirname $0):/bin:/usr/bin:/sbin
 
+cronstopstart="/etc/init.d/cron"
 . config.sh
 
 # If the noburn file is there then don't burn.
@@ -31,6 +32,10 @@ touch $noburnfile
 [ -z "$img" ] && exit 1
 [ -s "$img" ] || exit 1
 
+# To avoid buffer underruns I'm going to stop cron and renice myself
+$cronstopstart stop
+renice -10 $$
+
 # Burn the image to a disk.
 cdrecord-wrapper.sh -dao dev=$sdev $img > $logfile 2>&1
 
@@ -39,6 +44,10 @@ if [ "0" != "$?" ]; then
   exit 1
 fi
 
+# We don't need to be high-priority anymore.
+renice 0 $$
+$cronstopstart start
+
 # Now verify the disk by running md5sum on the entire contents of the disk
 md5sum=$(tempfile)
 echo Md5sum: $md5sum
diff --git a/scripts/cron-burn.sh b/scripts/cron-burn.sh
new file mode 100755
index 0000000..4967935
--- /dev/null
+++ b/scripts/cron-burn.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+export PATH=$(dirname $0):/bin:/usr/bin:/sbin
+
+. config.sh
+
+# burn-imgs.sh needs to be detached so that it can stop and start cron without
+# dying itself.
+
+setsid burn-imgs.sh
diff --git a/scripts/cron.sh b/scripts/cron-pack.sh
similarity index 90%
rename from scripts/cron.sh
rename to scripts/cron-pack.sh
index d052bd9..a757da9 100755
--- a/scripts/cron.sh
+++ b/scripts/cron-pack.sh
@@ -6,7 +6,8 @@ export PATH=$(dirname $0):/bin:/usr/bin:/sbin
 
 if [ -n "$(find $lastbackupfile -mtime +14)" -o -n "$(cat $statusfile | grep -i incomplete)" ]; then
   echo "Running backups from cron..."
-  exec pack-image.sh
+  setsid pack-image.sh
+  exit 0
 fi
 
 echo "Not running backups today.  Backups were last run on $(<$lastbackupfile)"
-- 
2.34.1