[Xen-changelog] [xen-unstable] [BLKTAP] Fix hotplug script to check if specified file exists.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID d173b32f54abe6b66010f0ee56648f6d52f9c44f
# Parent  233ce78de4e42a8db2107fbd0c859e23ce341fb7
[BLKTAP] Fix hotplug script to check if specified file exists.

Now users will see the following error:

[root@bebop ~]# xm create -c 128
Using config file "/etc/xen/128".
Error: Device 51713 (tap) could not be connected.
/tmp/128.img does not exist

Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx>
---
 tools/examples/blktap |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletion(-)

diff -r 233ce78de4e4 -r d173b32f54ab tools/examples/blktap
--- a/tools/examples/blktap     Thu Nov 09 13:30:16 2006 +0000
+++ b/tools/examples/blktap     Thu Nov 09 13:43:21 2006 +0000
@@ -4,12 +4,26 @@
 
 dir=$(dirname "$0")
 . "$dir/xen-hotplug-common.sh"
+. "$dir/block-common.sh"
 
 findCommand "$@"
 
+t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
+if [ -n "$t" ]
+then
+    p=$(xenstore_read "$XENBUS_PATH/params")
+    # if we have a ':', chew from head including :
+    if echo $p | grep -q \:
+    then
+        p=${p#*:}
+    fi
+fi
+file=$(readlink -f "$p") || ebusy "$p does not exist."
+
 if [ "$command" = 'add' ]
 then
-  success
+    [ -e "$file" ] || { ebusy $file does not exist; }
+    success
 fi
 
 exit 0

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