Am 06.03.19 um 10:07 schrieb Mark Hindley: > On Tue, Mar 05, 2019 at 09:11:28PM +0100, Michael Biebl wrote: >>>> This has the potential for some interesting breakage, like the real >>>> systemd being installed and used together with libelogind0. >>>> We would need to make sure something like that can never happen (ideas >>>> how to solve that?) >>> >>> Obviously that wouldn't work. >>> >>> At the moment elogind conflicts with systemd and depends on libelogind0. So >>> you >>> either end up with systemd + libsystemd0 or elogind + libelogind0. >> >> >> If the versions of elogind and systemd match up, you could end up with >> systemd + libelogind0. >> >> But to be >>> sure we could add libelogind0 conflicts systemd? >> >> This would need some testing if apt would do the right thing when >> switching from sysvinit-core + elogind to systemd-sysv + systemd. >> I've seen too many weird apt errors that were caused by Conflicts... > > I have just tested this: starting with sysvinit + elogind > > test@DebianUnstable:~$ sudo apt-get install default-logind > Reading package lists... Done > Building dependency tree > Reading state information... Done > Note, selecting 'libpam-systemd' instead of 'default-logind' > The following additional packages will be installed: > libargon2-1 libcryptsetup12 libnss-systemd libsystemd0 systemd systemd-sysv > Suggested packages: > systemd-container > The following packages will be REMOVED: > elogind libelogind0 libpam-elogind libpam-elogind-compat sysvinit-core > The following NEW packages will be installed: > libargon2-1 libcryptsetup12 libnss-systemd libpam-systemd libsystemd0 > systemd systemd-sysv > 0 upgraded, 7 newly installed, 5 to remove and 0 not upgraded. > Need to get 4,536 kB of archives. > After this operation, 12.6 MB of additional disk space will be used. > Do you want to continue? [Y/n] y > > Looks right to me. The installation proceeds without problems. >
Once you involve other packages (e.g. daemons that link against libsystemd0), having a time window where libelogind0 has been removed but libsystemd0 not yet being available, restarting such a daemon in between would be fatal. Let's hope, apt (or aptitude) always gets the ordering right. -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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