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From: Charles Duffy <Charles_Duffy@messageone.com>
Date: Thu, 28 May 2009 15:23:03 -0500
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Subject: [Qemu-devel] Re: Global -snapshot not working where -drive ...,
 snapshot=on is fine
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To: qemu-devel@nongnu.org

Much to my relief (after looking at the source and wondering in 
bewilderment how the two cases could differ), this is actually a false 
alarm caused by an empty string passed by libguestfs on argv and 
interpreted by qemu as a filename.