nrelease: Clean up a bit the 'clean' target

The '.didbootstrap' mark file was a legacy of the removed pkgsrc
bootstrap procedure.

nrelease: Let vnconfig(8) auto determine/create the vn device

nrelease: Unconfigure vn(4) and clean up after creating efiboot.img

nrelease: Simplify the adjustments to loader.conf for IMG boot

Use 'sed' similar to fstab adjustments instead of grep+echo to adjust
'boot/loader.conf' to the IMG boot.

nrelease: Adjust fstab to remove '-C' option for /tmp tmpfs mount

For the /tmp mount, no need to copy the origin contents; also, there
shouldn't be any contents at this early boot stage.

nrelease: Adjust fstab and reuse it for IMG boot

The root '/' filesystem is mounted by the kernel, so it can be omitted
from 'etc/fstab'. This also makes the 'fstab' file be used by the IMG
boot, s

nrelease: Adjust fstab and reuse it for IMG boot

The root '/' filesystem is mounted by the kernel, so it can be omitted
from 'etc/fstab'. This also makes the 'fstab' file be used by the IMG
boot, so just reuse it.

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nrelease: Fix up rc.conf to mount root readwrite for IMG boot

While there, remove the obsolete comments in 'etc/rc.conf'.

nrelease: Add root_rw_mount="NO" to rc.conf to fix ISO boot

The ISO root filesystem is obviously readonly and cannot be remounted to
'rw'. Without setting 'root_rw_mount=NO', the ISO boot would abo

nrelease: Add root_rw_mount="NO" to rc.conf to fix ISO boot

The ISO root filesystem is obviously readonly and cannot be remounted to
'rw'. Without setting 'root_rw_mount=NO', the ISO boot would abort
after failing to remount the root filesystem.

This is a follow-up fix to my previous commit
31b00396377857ebb62259aa944f9351fa62ea44.

Reported-by: Sergey Zigachev (servik)

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nrelease - fix/improve livecd

Make building a livecd image with "binpkgs" easier:

make release gui binpkgs

now works out of the box without having to manually specify the
corresponding package

nrelease - fix/improve livecd

Make building a livecd image with "binpkgs" easier:

make release gui binpkgs

now works out of the box without having to manually specify the
corresponding packages for some ports (e.g. perl5).

While there, fix .xinitrc (we no longer use pkgsrc) and use a more
recent xorg.conf.

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ttys: Enable video ttys only if the device exists

Credit: https://reviews.freebsd.org/D15169

nrelease: Add 'IMGSIZE_MB' to specify file size in units of MB

The image file size was specified by the 'IMGSIZE' variable, but it's
the number of 512-byte sectors, which isn't intuitive and require

nrelease: Add 'IMGSIZE_MB' to specify file size in units of MB

The image file size was specified by the 'IMGSIZE' variable, but it's
the number of 512-byte sectors, which isn't intuitive and requires a
manual conversion. Add the 'IMGSIZE_MB' variable to directly specify
the file size in units of MB, which is more intuitive and friendly.

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nrelease: Remove downloaded packages from ISO/IMG

nrelease: Allow /etc/ssl/cert.pem be missing

The 'pkg-bootstrap' target in '/usr/Makefile' has been updated to work
without '/etc/ssl/cert.pem', so ignore copy failure of this file.

nrelease: Improve 'etc.hdd' creation to eliminate inconsistency

Previously, the 'etc.hdd' was created during the 'buildiso' target and
then updated in the 'pkgs' target. However, in the 'pkgs' targ

nrelease: Improve 'etc.hdd' creation to eliminate inconsistency

Previously, the 'etc.hdd' was created during the 'buildiso' target and
then updated in the 'pkgs' target. However, in the 'pkgs' target, only
the password files (i.e., master.passwd, passwd, group) were copied but
the password DBs (i.e., pwd.db, spwd.db) were not rebuild. This caused
an inconsistency in 'etc.hdd'. When a user tried manual installation
and forgot to run 'pwd_mkdb', the installed system would fail to add new
users and generate errors like:

> pw: user 'myuser' disappeared during update.
> adduser: ERROR: There was an error adding user (myuser).

This commit improves the creation of 'etc.hdd'. Reorder the 'customiso'
target *after* the 'pkgs' target, so we can simply copy the 'etc' to
'etc.hdd' and be done, without any further changes, and the resulting
password files and DBs are in consistency. In addition, this avoids
adding the 'installer' user to the 'etc.hdd' and so we get a cleaner
system by default.

See also: https://lists.dragonflybsd.org/pipermail/users/2023-February/428576.html
(Regenerating the password databases on new installs)

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