From ed826b3a92dc5cc297991401c523de12c9854077 Mon Sep 17 00:00:00 2001
From: Dan McGee <dan@archlinux.org>
Date: Mon, 31 Jan 2011 13:09:49 -0600
Subject: [PATCH] Enhance sleep hook to watch for device availability

Add a sleepdevice= parameter that will watch for the specified device to
appear and then move on. This is more flexible than a defined sleep period
and prevents needless waiting if the device appears sooner.

Signed-off-by: Dan McGee <dan@archlinux.org>
---
 hooks/sleep   |   15 +++++++++++++--
 install/sleep |    3 +++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/hooks/sleep b/hooks/sleep
index bade71a..69b53e7 100644
--- a/hooks/sleep
+++ b/hooks/sleep
@@ -4,6 +4,17 @@ run_hook ()
     if [ -z "${sleeptime}" ] || ! [ "${sleeptime}" -gt 0 ]; then
         sleeptime=5
     fi
-    msg "Sleeping for ${sleeptime} seconds."
-    sleep ${sleeptime}
+    if [ -n "${sleepdevice}" ]; then
+        msg "Sleeping up to ${sleeptime} seconds for device ${sleepdevice}."
+        while [ ${sleeptime} -ge 0 ]; do
+            if [ -b "${sleepdevice}" ]; then
+                return
+            fi
+            sleep 1
+            sleeptime=$(expr ${sleeptime} - 1)
+        done
+    else
+        msg "Sleeping for ${sleeptime} seconds."
+        sleep ${sleeptime}
+    fi
 }
diff --git a/install/sleep b/install/sleep
index f7f82bd..a59d0c3 100644
--- a/install/sleep
+++ b/install/sleep
@@ -15,5 +15,8 @@ cat <<HELPEOF
   for a fixed time interval. The time in seconds
   can be specified in the sleeptime= command line
   parameter. The default is 5 seconds.
+  If a sleepdevice= parameter is specified, sleep
+  until the given device node is available, polling
+  at one second intervals until sleeptime is reached.
 HELPEOF
 }
-- 
1.7.3.5