Systemd presets for user units
System units are managed through presets since F18 and by policy, presets are carried by the fedora-release package. This policy is now extended to user units.
- Name: Zbigniew Jędrzejewski-Szmek
- Email: zbyszek at in waw pl
- Targeted release: Fedora 32
- Last updated: 2020-01-10
- Tracker bug: <will be assigned by the Wrangler>
- Release notes tracker: <will be assigned by the Wrangler>
The preset mechanism for user units was already in place, but we were missing the actual preset files, and the default was "enable *" instead of "disable *" as for system services.
Systemd will now provide a /usr/lib/systemd/user-preset/99-default-disable.preset that marks user services as disabled by default. Any user services which should be enabled will be to get an appropriate preset in /usr/lib/systemd/user-preset/90-default-user.preset or a spin-specific file. Most packages already call into the preset mechanism, but those which don't will be adjusted to do that.
This is essentially a fix for https://bugzilla.redhat.com/show_bug.cgi?id=1468501. There is no good reason to treat user services different than system services in this regard. On the systemd side this change is very simple, but all packages that provide user units need to be reviewed to check if they are enabled after the change if appropriate.
Benefit to Fedora
User and system services are handled in the same way.
Local configuration may be used to override which services should be enabled after upgrade. In particular, "local" in this context may mean "per-spin" or "per-user".
- Proposal owners:
- review all packages that provide user services in Fedora and submit PRs when changes are needed
- add a new presets file to the fedora-release package for user units
- submit a proposal to FPC to update the guidelines (essentially to say "... and the same for user services.").
- Other developers:
- FPC: review (and accept ;)) the guidelines changes
- other maintainers: verify that units in their packages are enabled or not as appropriate after package installation
- Release engineering: n/a
- Policies and guidelines: a pull request will be submitted
- Trademark approval: N/A (not needed for this Change)
Approximate list of units:
$ dnf repoquery --whatprovides '/usr/lib/systemd/user/*' --releasever=32 -l|grep -v target|sed -r -n 's,/usr/lib/systemd/user/(.+),\1,p' systemd-tmpfiles-setup.service 90-systemd.preset systemd-tmpfiles-clean.timer 90-systemd.preset systemd-tmpfiles-clean.service (covered by .timer) systemd-exit.service (not needed) gnome-shell-*.* gnome-initial-setup*.* gsd-*.* (There's a bazillion of those, with a separate target for each service. The scheme is being reworked in https://gitlab.gnome.org/GNOME/gnome-session/merge_requests/34, so I'm omitting them from this list.) gnome-session-*.service gnome-welcome-tour.service permanently-enabled dbus.socket 90-default-user.preset enabled-after-installation dbus-broker.service 90-default-user.preset dbus-daemon.service (not needed) at-spi-dbus-bus.service bamfdaemon.service blueman-applet.service colord-session.service cros-garcon.service enabled-after-installation cros-pulse-config.service enabled-after-installation ddupdate.service dunst.service emacs.service enlightenment.service ethumb.service evolution-addressbook-factory.service evolution-calendar-factory.service evolution-source-registry.service evolution-user-prompter.service flatpak-oci-authenticator.service flatpak-oci-authenticator.service flatpak-portal.service flatpak-portal.service flatpak-session-helper.service fleet-commander-adretriever.service enabled-after-installation gamemoded.service glib-pacrunner.service glib-pacrunner.service gnome-remote-desktop.service gnome-terminal-server.service gnome-user-share-webdav.service grive-changes@.service grive-timer@.service grub-boot-success.service (covered by .timer) grub-boot-success.timer permanently-enabled gvfs-afc-volume-monitor.service gvfs-daemon.service gvfs-daemon.service gvfs-goa-volume-monitor.service gvfs-gphoto2-volume-monitor.service gvfs-metadata.service gvfs-metadata.service gvfs-mtp-volume-monitor.service gvfs-udisks2-volume-monitor.service gvfs-udisks2-volume-monitor.service io.podman.service io.podman.socket mako.service enabled-after-installation mpDris2.service mpris-scrobbler.service enabled-after-installation obex.service onedrive.service org.gnome.Evince.service org.gnome.GPaste.Ui.service org.gnome.GPaste.service p11-kit-client.service p11-kit-remote.socket enabled-after-installation p11-kit-remote@.service p11-kit-server.service p11-kit-server.socket pipewire.service (covered by .socket) pipewire.socket 90-default-user.preset permanently-enabled pulseaudio.service (covered by .socket) pulseaudio.socket enabled-after-installation redshift-gtk.service redshift.service reportd.service rtags.service enabled-after-installation rtags.socket enabled-after-installation rygel.service snapd.session-agent.service (covered by .socket) snapd.session-agent.socket 90-default-user.preset enabled-after-installation sommelier-x@.service enabled-after-installation sommelier@.service enabled-after-installation squeezelite.service enabled-after-installation syncevo-dbus-server.service syncthing.service 90-syncthing.preset custom preset to be dropped, https://bugzilla.redhat.com/show_bug.cgi?id=1708297 termy-server.service (covered by .service) termy-server.socket enabled-after-installation thunar.service tracker-extract.service tracker-miner-fs.service tracker-miner-rss.service tracker-store.service tracker-writeback.service unity-gtk-module.service permanently-enabled vino-server.service vncserver@.service xdg-desktop-portal-gtk.service xdg-desktop-portal.service xdg-desktop-portal.service xdg-document-portal.service xdg-document-portal.service xdg-permission-store.service xdg-permission-store.service xfce4-notifyd.service yacreaderlibraryserver.service zeitgeist-fts.service zeitgeist.service
Legend: - a preset file is shown if it covers the unit - "permanently-enabled" — a symlink in /usr/lib/systemd/user/*.wants/ is installed by rpm. Most of those should be changed to an [Install] section. It seems that in most cases the unit should be disabled by default, and the permanent enablement is a mistake. - "enabled-after-installation" — a symlink in /etc/systemd/user/*.wants/ is created by rpm. Most of those seem to be mistaked too, we don't want them enabled by default. - Any unit which doesn't have "*enabled*" won't be affected by this change, since either it doesn't have the [Install] section or the package doesn't have scriptlets. So those files can be ignored.
Should not be user visible. Some units which are are currently enabled by mistake will not be enabled anymore on new installations.
How To Test
Install a new system (or uninstall and reinstall some packages). Verify that the appropriate units are enabled for the user session.
- Contingency mechanism: Revert the changes.
- Contingency deadline: beta freeze
- Blocks release? No
- Blocks product? No
A pull request for the packaging guidelines will be submitted.