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Re: Changing disk image boot options without root privileges (David Young) writes:

>On Sun, Apr 16, 2017 at 01:48:30PM +0300, Andreas Gustafsson wrote:
>> I can fix that using vnconfig and installboot like this:
>>   vnconfig vnd0 NetBSD-7.99.1-amd64-live-wd0root.img
>>   installboot -e -o console=com0 /dev/vnd0a
>>   vnconfig -u vnd0

>installboot can run on a disk image directly, unless there has
>been some regression.

Yes, but it can only write to a single partition image. For a disk image,
it would need to interpret disklabel (or other partitioning information)
itself and offset disk accesses accordingly.

                                Michael van Elst
                                "A potential Snark may lurk in every tree."

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