[Xen-bugs] [Bug 860] New: device_mapper config variable is not checked for correctness

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=860

           Summary: device_mapper config variable is not checked for
                    correctness
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: henning_sprang@xxxxxx


While an error is given when the device_mapper variable is not set at all,
there seems to be no check if the contents of this variable are usable and
useful.

So, when setting it wrong, Xen just starts, not starting any graphics access,
and not giving any useful information on solving the problem. That is bad and
can cost users hours of their time.

I just searched for hours to find out this problem - when starting a HVM Domain
with the new xensource 3.0.4 binaries, I got no graphics, neither in sdl nor in
vnc. No error messages anywhere.
Finally, just before writing a rant mail to -devel about new, undocumented
changes, I just came up with the idea to try another setting for the
device_mapper variable. And, exactly: while in Debian(where I ran the same
domains before with the native packages), the qemu-dm is in the search path,
and so this variable can be set with no abolute path, this is different in the
xensource packages.

I'll look in the source and will try to find a place to put a check for this,
and might come up with a patch some time...


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