Bug#926316: systemd: Installing the systemd package switches the init system to systemd

[Felipe Sateler]

On Wed, Apr 3, 2019 at 7:18 AM Emmanuel Bourg <ebourg at apache.org> wrote:

> Package: systemd
> Version: 241-1
> Severity: normal
>
> Hi,
>
> The description of the systemd package states that installing it will not
> switch the init system, unfortunately that's what happens, unless systemd
> is installed with --no-install-recommends. It looks like a recommended
> dependency (libpam-systemd?) triggers the removal of sysvinit-core.


> I haven't been able to track exactly why it happens in testing with the
> version 241-1. With the version 241-2 in sid I guess the removal of
> systemd-shim from the alternative dependencies of libpam-systemd [1]
> last week doesn't help.
>
>
>     root at sysvinit:~# ps aux
>     USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME
> COMMAND
>     root         1  0.0  0.0   7900  1980 pts/1    Ss+  09:29   0:00 init
> [2]
>     root       884  0.0  0.1 156188  2412 ?        Ssl  09:29   0:00
> /usr/sbin/rsyslogd
>     root       912  0.0  0.0   5508  1968 ?        Ss   09:29   0:00
> /usr/sbin/cron
>     root       940  0.0  0.1   4000  3300 ?        Ss   09:29   0:00
> /bin/bash
>     root      1237  0.0  0.0   2420  1480 pts/0    Ss+  09:31   0:00
> /sbin/getty --noclear 38400 tty1
>     root      1238  0.0  0.0   2420  1556 pts/1    Ss+  09:31   0:00
> /sbin/getty --noclear 38400 tty2
>     root      2269  0.0  0.1   7640  2724 ?        R+   09:53   0:00 ps aux
>
>     root at sysvinit:~# ls -l /sbin/init
>     -rwxr-xr-x 1 root root 53016 Feb 14 20:33 /sbin/init
>
>     root at sysvinit:~# apt install systemd
>     Reading package lists... Done
>     Building dependency tree
>     Reading state information... Done
>     The following packages were automatically installed and are no longer
> required:
>       initscripts insserv startpar sysv-rc
>     Use 'apt autoremove' to remove them.
>     The following additional packages will be installed:
>       dbus libargon2-1 libcryptsetup12 libdbus-1-3 libexpat1 libjson-c3
> libnss-systemd libpam-systemd systemd-sysv
>     Suggested packages:
>       default-dbus-session-bus | dbus-session-bus systemd-container
> policykit-1
>     The following packages will be REMOVED:
>       sysvinit-core
>     The following NEW packages will be installed:
>       dbus libargon2-1 libcryptsetup12 libdbus-1-3 libexpat1 libjson-c3
> libnss-systemd libpam-systemd systemd systemd-sysv
>     0 upgraded, 10 newly installed, 1 to remove and 0 not upgraded.
>     Need to get 4786 kB of archives.
>     After this operation, 16.7 MB of additional disk space will be used.
>     Do you want to continue? [Y/n] n
>     Abort.
>

Looks like sysvinit-core needs XB-Important: yes to prevent such easy
removal.

-- 

Saludos,
Felipe Sateler
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