Debian 12 postrm script requires perl

[AndreRicardo-Zoetis]

I know Debian 12 is not supported yet in ADU, but after migrating to Debian 12 we've started seeing this error on ADU reinstalls

# deluser --system --remove-home adu
deluser: In order to use the --remove-home, --remove-all-files, and --backup features,
you need to install the `perl' package. To accomplish that, run
apt-get install perl.

From:

iot-hub-device-update/packages/debian/postrm

Line 28 in 18e98a9

deluser --system --remove-home "$adu_user" > /dev/null

Seems that the flag --remove-home needs perl to be installed, which adds quite a lot of packages and disk usage for us.

# apt-get install perl
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libcurl4-openssl-dev python3-wheel
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  libgdbm-compat4 libperl5.36 perl-modules-5.36
Suggested packages:
  perl-doc libterm-readline-gnu-perl | libterm-readline-perl-perl make libtap-harness-archive-perl
The following NEW packages will be installed:
  libgdbm-compat4 libperl5.36 perl perl-modules-5.36
0 upgraded, 4 newly installed, 0 to remove and 16 not upgraded.
Need to get 7,319 kB of archives.
After this operation, 48.6 MB of additional disk space will be used.

Is --remove-home really needed?

[AndreRicardo-Zoetis]

Example from our device, home folder is not set.

# grep adu /etc/passwd
adu:x:800:800::/nonexistent:/bin/false
# ls -alh /nonexistent
total 8.0K
drwxr-xr-x  2 adu  adu  4.0K Nov 20 14:37 .
drwxr-xr-x 22 root root 4.0K Nov 20 14:37 ..