Disable kernfs on live images -- it is not required.

Fix fallout from mkimage rev 1.76.

For mkimage:

- Update "size" if auto-calculated.
- Use "dd bs=1" instead of non-portable "head -c".
- Some style nits.

For MD make_label() functions:

- Stop usi

Fix fallout from mkimage rev 1.76.

For mkimage:

- Update "size" if auto-calculated.
- Use "dd bs=1" instead of non-portable "head -c".
- Some style nits.

For MD make_label() functions:

- Stop using "newsize" as image size in MB, use "size" instead.

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Be more precise about exactly what fails when something does.

Relying upon set -e to abort things is sort of OK (it is not
a recommended option to use in general - too many odd special cases),
but o

Be more precise about exactly what fails when something does.

Relying upon set -e to abort things is sort of OK (it is not
a recommended option to use in general - too many odd special cases),
but only if user can work out from the "build failed" what actually
went wrong.

Tested only on amd64 build (for this, i386 is the same) - if anyone
has problems on builds for other systems, please let me know. However
the changes affect only failure paths, the most likely problem would
be for a build to fail to halt on an error, and I hope I have avoided
that. There should be no difference at all to error-free builds.

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Fix previous so that the new generated rc.conf is picked up and that
any new new mount points (e.g. /proc and /kern) are generated.

While here increate the fs size so that postfix can actually build

Fix previous so that the new generated rc.conf is picked up and that
any new new mount points (e.g. /proc and /kern) are generated.

While here increate the fs size so that postfix can actually build
/etc/mail/aliases.db

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PR/49596: mkimage: incorrect permissions on evbarm images

Use NetBSD.dist in our mtree specification to populate the top level
directories, etc.

For each generated file hand craft an mtree entry.

PR/49596: mkimage: incorrect permissions on evbarm images

Use NetBSD.dist in our mtree specification to populate the top level
directories, etc.

For each generated file hand craft an mtree entry.

Remove specialdirs as NetBSD.dist creates /proc and /kern.

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fix image building:
- round up the total size of the disk image
- fix fdisk offset for netbsd ffs images

merge more, and add an i386 image

remove swap; these days x86 machines don't need it.

these changes produce a bootable system under qemu, but its root is trashed.

Add preliminary support for creating x86 usb sticks with mkimage.
This is untested, and just a checkpoint of the work. Image looks
ok, but I have not tried if it boots.