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99ddba828f
If we rely on OCaml's internal exception printing, then it will
truncate error messages like this:
Fatal error: exception Guestfs.Error("could not create appliance
through libvirt.
Try running qemu directly without libvirt using this environment
variable: export LIBGUESTFS_BACKEND=direct
Original error from libvirt: unable to set security context
'unconfined_u:object_r:svi
note the truncation here ^^^^^^^
Instead of using the internal exception printing, wrap the whole
program in a 'main ()' function and add an exception handler.
This large change is non-functional apart from the addition of the
exception handlers at the end.
(cherry picked from commit 3331db84bc)