Bug#1004333: deb-systemd-helper does not recognize purged package

[Marc Haber]

Package: init-system-helpers
Version: 1.61
Severity: normal
File: /usr/bin/deb-systemd-helper

Hi,

given the following code in a maintainer script:

postinst
if [ -x "/usr/bin/deb-systemd-helper" ]; then
        deb-systemd-helper mask 'sudo.service' || true
fi

postrm
case "$1" in
  purge)
        if [ -x "/usr/bin/deb-systemd-helper" ]; then
                deb-systemd-helper unmask 'sudo.service' || true
        fi

the masking symlink stays around after purge. When the package is
installed, ther is no sudo.service marker file in /var/lib/systemd/deb-systemd-helper-masked/

dpkg/deb-systemd-helper output from package installation:

root at salida:~# dpkg --list sudo
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=================================
un  sudo           <none>       <none>       (no description available)
root at salida:~# dpkg --install /home/mh/packages/sudo/build-area/sudo_1.9.8p2-2~1_amd64.deb
Selecting previously unselected package sudo.
(Reading database ... 42180 files and directories currently installed.)
Preparing to unpack .../sudo_1.9.8p2-2~1_amd64.deb ...
Unpacking sudo (1.9.8p2-2~1) ...
Setting up sudo (1.9.8p2-2~1) ...
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = mask, scriptname = sudo.service, service_path = sudo.service
Processing triggers for libc-bin (2.33-3) ...
Processing triggers for man-db (2.9.4-4) ...
root at salida:~# ls -la /var/lib/systemd/deb-systemd-helper-masked/
total 8
drwxr-xr-x  2 root root 4096 Jan  5 21:55 .
drwxr-xr-x 11 root root 4096 Jan  5 21:55 ..
-rw-r--r--  1 root root    0 Jan  5 21:55 systemd-timesyncd.service
root at salida:~#

dpkg/deb-systemd-helper output from package purge:

root at salida:~# dpkg --purge sudo
(Reading database ... 42313 files and directories currently installed.)
Removing sudo (1.9.8p2-2~1) ...
Purging configuration files for sudo (1.9.8p2-2~1) ...
(deb-systemd-helper DEBUG) is purge = no
(deb-systemd-helper DEBUG) action = unmask, scriptname = sudo.service, service_path = sudo.service
(deb-systemd-helper DEBUG) Not unmasking /etc/systemd/system/sudo.service because the state file /var/lib/systemd/deb-systemd-helper-masked/sudo.service does not exist
(deb-systemd-helper DEBUG) rmdir_if_empty /var/lib/systemd/deb-systemd-helper-masked
(deb-systemd-helper DEBUG) rmdir(/var/lib/systemd/deb-systemd-helper-masked) failed (Directory not empty)
(deb-systemd-helper DEBUG) rmdir_if_empty /var/lib/systemd/deb-systemd-user-helper-masked
(deb-systemd-helper DEBUG) rmdir(/var/lib/systemd/deb-systemd-user-helper-masked) failed (No such file or directory)
dpkg: warning: while removing sudo, directory '/etc/sudoers.d' not empty so not removed
Processing triggers for libc-bin (2.33-3) ...
Processing triggers for man-db (2.9.4-4) ...
root at salida:~# ls -al /etc/systemd/system/sudo.service
lrwxrwxrwx 1 root root 9 Jan 23 23:25 /etc/systemd/system/sudo.service -> /dev/null
root at salida:~#

What is going wrong here?

Greetings
Marc

-- System Information:
Debian Release: bookworm/sid
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.16.1-zgsrv20080 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages init-system-helpers depends on:
ii  perl-base  5.32.1-6

init-system-helpers recommends no packages.

init-system-helpers suggests no packages.

Versions of packages init-system-helpers is related to:
pn  insserv  <none>

-- no debconf information