[Xen-devel] [PATCH] Fix stubdom-dm using "grep" improperly

[John Weekes <lists.xen@xxxxxxxxxxxxxxxxxx>]

stubdom-dm uses "grep" on "xm list" output to determine whether it is 
already running. The existing behavior is to use "grep $domname-dm" but 
this will result in a false-positive in the case of another domU running 
whose name ends with the full new name; for instance, if "abctest-dm" is 
running, a new "test-dm" will spin forever, waiting for it the end.
Any easy fix is to have it use "grep -w" instead of "grep", searching 
for the whole word only.
It also might be worth considering a switch to "xl list" from "xm list", 
here and in other places.
This bug appears to exist in xen-4.0-testing, as well.

Since it's a one-liner, a signed-off may not be needed, but just in case..

Signed-off-by: John Weekes <lists.xen@xxxxxxxxxxxxxxxxxx>

--- a/xen-unstable.hg/stubdom/stubdom-dm        2010-08-10 
23:20:26.187051097 -0500
+++ b/xen-unstable.hg/stubdom/stubdom-dm        2011-01-09 
22:43:15.951806650 -0600
@@ -91,7 +91,7 @@
 ############
 # stubdomain
 # Wait for any previous stubdom to terminate
-while xm list | grep $domname-dm
+while xm list | grep -w $domname-dm
 do
        sleep 1
 done

stubdom-dm.patch
Description: Text Data

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