because the cleanup function gets run by the error handler and should
not be nested

https://github.com/grml/grml-debootstrap/issues/224#issuecomment-1779673194

because these are now covered by the new error handling method

only delete `$MNTPOINT` if such a folder actually exists

only delete `$MNTPOINT` if such a folder actually exists

No need to use both, `eend 1` and `bailout 1`.
In these cases, only `bailout 1` is sufficient.

because these are now covered by the error_handler

busybox is useful for debugging initramfs issues, though it's not
necessary by default. Also tools like cryptsetup which rely on busybox
in initramfs stage have busybox as dependency anyways.

Thanks: Patrick Schleizer + Chris Hofstaedtler
Closes: https://github.com/grml/grml-debootstrap/issues/240

fixes https://github.com/grml/grml-debootstrap/issues/235

Since commit a8eeda3e this seems obsolete.

passwd.postinst enables shadow passwords for the last 16 years. Add a test
instead.

debootstrap already creates the minimally needed set of device nodes,
and everything else will come from udev. Booting systems without udev
is not supported in Debian TTBOMK, so we also do not need to try
supporting that.

Here is the contents of /dev with this patch applied, for a bookworm install:

/dev:
total 4
drwxr-xr-x  4 root root  182 Nov 13 22:50 ./
drwxr-xr-x 17 root root 4096 Nov 13 22:51 ../
crw-rw-rw-  1 root root 5, 1 Nov 13 22:50 console
lrwxrwxrwx  1 root root   13 Nov 13 22:50 fd -> /proc/self/fd/
crw-rw-rw-  1 root root 1, 7 Nov 13 22:50 full
crw-rw-rw-  1 root root 1, 3 Nov 13 22:50 null
crw-rw-rw-  1 root root 5, 2 Nov 13 22:50 ptmx
drwxr-xr-x  2 root root    6 Nov 13 22:50 pts/
crw-rw-rw-  1 root root 1, 8 Nov 13 22:50 random
drwxr-xr-x  2 root root    6 Nov 13 22:50 shm/
lrwxrwxrwx  1 root root   15 Nov 13 22:50 stderr -> /proc/self/fd/2
lrwxrwxrwx  1 root root   15 Nov 13 22:50 stdin -> /proc/self/fd/0
lrwxrwxrwx  1 root root   15 Nov 13 22:50 st...

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.

Hosts EFI support is unlikely to be related to the VMs EFI support, so this
check often only adds noise.