This reports shellcheck output for *changed* lines. Preexisting problems are
not reported.

Catch up with shellcheck 0.9.0.

To improve shellcheck usage in chroot-script, add a stub file defining ARCH.

This commit is very minimal. In particular it avoids moving/deduplicating code
and/or any style changes.

Remove unnecessary use of `eend 0`, which does effectively nothing.
Leftover from git rev c87dc4ae where we moved from grml-etc-core's
lsb-functions functions to a simplified version of them.

Closes: https://github.com/grml/grml-debootstrap/issues/229

It's required for builds with `--vmefi` and `--efi`, since those depend on mkfs.fat.
Closes: https://github.com/grml/grml-debootstrap/issues/225

Enable `set -e` if environment variables `REPORT_TRAP_ERR`
or `FAIL_TRAP_ERR` are set to `yes`.

related to https://github.com/grml/grml-debootstrap/issues/224

By disabling tty when running tune2fs.

https://github.com/grml/grml-debootstrap/issues/219

Closes: https://github.com/grml/grml-debootstrap/issues/169

This commit introduces a new option --vmefi that will change the VM image
to use GPT instead of MBR and adds an ESP partition. Further it will install
grub in EFI mode with secure boot support.

Closes: https://github.com/grml/grml-debootstrap/issues/134

While refreshing base boxes for Vagrant, let's update Grml ISO
from 2022.11-rc1 to stable release 2022.11.

Signed-off-by: Giovanni Rosa <g.rosa1@studenti.unimol.it>

We pass the requested --grub … device argument to the GRUB package
configuration, like:

| # debconf-show grub-pc | grep grub-pc/install_devices:
| * grub-pc/install_devices: /dev/sda

But the GRUB package tries to use /dev/disk/by-id/... for
install_devices setting (since 2010 and Debian/squeeze AFAICS), as can
be observed by reconfiguring the GRUB package (which then automatically
converts the /dev/sdX to the proper /dev/disk/by-id/... device when
being asked in the debconf prompt):

| # dpkg-reconfigure grub-pc
| grub-pc: Running grub-install ...
| [...]
| # debconf-show grub-pc | grep grub-pc/install_devices:
| * grub-pc/install_devices: /dev/disk/by-id/ata-VBOX_HARDDISK_VBf4f4391c-6316fa69

The available_ids() and device_to_id() helper functions are based on
code by Colin Watson <cjwatson@debian.org> in GRUB's postinst script
of the Debian package, see git commits 4830efd9e + ce2a43c85 at
https://salsa.debian.org/grub-team/grub.git.

Closes: https://github.com/grml/grml-debootstrap/issues/206

As of e2fsprogs v1.43 and Linux kernel v4.4 the ext4 file system supports
the new metadata_csum_seed feature (which allows the file system UUID to
be modified without needing to update all of the file system metadata).
Also see https://bugs.debian.org/1031325

Starting with e2fsprogs v1.47 this new metadata_csum_seed feature gets
enabled by default. When installing an older Debian release this might
cause problems because it's not fully supported yet, see e.g. the GRUB
failure documented as #866603.

To keep the behavior identical to Debian, we do not enable the
metadata_csum_seed feature for Debian releases before bookworm.  This is
relevant for us, as grml-debootstrap might be running from a more recent
Debian release (like a Debian testing/unstable based Grml live system).

We check for the e2fsprogs version as versions before 1.43 didn't support
the metadata_csum_seed option yet.

Closes: #1031416
Closes: https://github.com/grml/grml-debootstrap/issues/204

Avoid depending on git.grml.org service which we might deprecate

The git protocol is discouraged and insecure.

We consider deprecating our git.grml.org service and
also the git protocol is insecure and should be avoided,
update debian/control + debian/copyright accordingly.

There's no point in suggesting EOL releases in the dialog(1) dialog any
longer, so let's drop lenny, squeeze, wheezy, jessie + stretch there.
While at it switch from X.Y to X version schema as we always install
the latest Debian (point) release and not the displayed X.0 one.

Use bookworm as the new default release so we get grml-debootstrap
accordingly into the bookworm freeze (see
https://release.debian.org/testing/freeze_policy.html for details).

Update the docs regarding support releases.

If the --non-free option gets enabled packages like 'firmware-linux',
'firmware-linux-nonfree', 'firmware-misc-nonfree' should be available.
Starting with Debian/bookworm the firmware related packages got moved
from "non-free" to the new "non-free-firmware" component/repository though
(related to https://www.debian.org/vote/2022/vote_003).