[Bug 1915936] Re: systemd-coredump user is created by something other than its derived systemd packages

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** Changed in: systemd (Debian)
       Status: New => Confirmed

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Title:
  systemd-coredump user is created by something other than its derived
  systemd packages

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Bionic:
  Won't Fix
Status in systemd source package in Focal:
  Won't Fix
Status in systemd source package in Groovy:
  Won't Fix
Status in systemd source package in Hirsute:
  Won't Fix
Status in systemd source package in Impish:
  New
Status in systemd package in Debian:
  Confirmed

Bug description:
  systemd-coredump binary package is instructed as follows:

  #debian/systemd-coredump.postinst:
  adduser --quiet --system --group --no-create-home --home /run/systemd \
  --gecos "systemd Core Dumper" systemd-coredump

  But one doesn't need this package to be installed to have the systemd-
  coredump user created. This was taken from a focal 20.04.2 fresh
  installation (Right after a vanilla installation):

  # cat /etc/passwd:
  ...
  systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin
  ...

  # dpkg -l | grep -i systemd
  ii  dbus-user-session                    1.12.16-2ubuntu2.1                amd64        simple interprocess messaging system (systemd --user integration)
  ii  libnss-systemd:amd64                 245.4-4ubuntu3.4                  amd64        nss module providing dynamic user and group name resolution
  ii  libpam-systemd:amd64                 245.4-4ubuntu3.4                  amd64        system and service manager - PAM module
  ii  libsystemd0:amd64                    245.4-4ubuntu3.4                  amd64        systemd utility library
  ii  networkd-dispatcher                  2.0.1-1                           all          Dispatcher service for systemd-networkd connection status changes
  ii  python3-systemd                      234-3build2                       amd64        Python 3 bindings for systemd
  ii  systemd                              245.4-4ubuntu3.4                  amd64        system and service manager
  ii  systemd-sysv                         245.4-4ubuntu3.4                  amd64        system and service manager - SysV links
  ii  systemd-timesyncd                    245.4-4ubuntu3.4                  amd64        minimalistic service to synchronize local time with NTP servers

  # /var/log/syslog
  syslog:Feb 17 15:31:56 test systemd-sysusers[402]: Creating group systemd-coredump with gid 999.
  syslog:Feb 17 15:31:56 test systemd-sysusers[402]: Creating user systemd-coredump (systemd Core Dumper) with uid 999 and gid 999.

  
  Additionnally, you may notice the home directory during the user creation at installation sets it to "/" as opposed to "/run/systemd" directive in the appropriate postint. It is contradictory.

  * Why systemd-coredump user is created at installation time and/or without 'systemd-coredump' package installed ?
  * Why this early creation set the home directory to "/" ?

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