Bug 99873 - consider warning when session services have the wrong name
Summary: consider warning when session services have the wrong name
Status: RESOLVED MOVED
Alias: None
Product: dbus
Classification: Unclassified
Component: core (show other bugs)
Version: git master
Hardware: Other All
: medium enhancement
Assignee: D-Bus Maintainers
QA Contact: D-Bus Maintainers
URL:
Whiteboard:
Keywords:
Depends on: 99825
Blocks:
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Reported: 2017-02-20 16:41 UTC by Simon McVittie
Modified: 2018-10-12 21:30 UTC (History)
0 users

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Description Simon McVittie 2017-02-20 16:41:21 UTC
Best practice for D-Bus session services is to define the service com.example.Foo in a file named com.example.Foo.service. This ensures that it is unambiguous which one is started: the one that is first in directory search order (this is not 100% reliable until one of the patches from Bug #99825 lands).

dbus-daemon could warn if a service is encountered that does not satisfy that constraint. However, this is currently wrong in a lot of software <https://lintian.debian.org/tags/dbus-session-service-wrong-name.html> so we should probably get some of those fixed first.

The cost of obeying that constraint is that if two software packages are deliberately providing implementations of the same well-known bus name, they will have file conflicts. However, this does not seem a whole lot worse than the current situation, where whichever one appears first in readdir() order is chosen, which I'm fairly sure is not what the software author intended.
Comment 1 Simon McVittie 2017-02-20 16:41:37 UTC
Here is a brief survey of packages in Debian that would provoke these warnings. In each case the first name is what we want and the second is what we saw.

---- Deliberately colliding ----

apper: org.freedesktop.PackageKit.service usr/share/dbus-1/services/kde-org.freedesktop.PackageKit.service

caja-common: org.freedesktop.FileManager1.service usr/share/dbus-1/services/org.mate.freedesktop.FileManager1.service
dolphin: org.freedesktop.FileManager1.service usr/share/dbus-1/services/org.kde.dolphin.FileManager1.service
nemo: org.freedesktop.FileManager1.service usr/share/dbus-1/services/org.nemo.freedesktop.FileManager1.service
    If we try to activate o.fd.FM1.service with more than one of these installed, we will get a randomly chosen implementation. This does not seem practically useful.

dunst: org.freedesktop.Notifications.service usr/share/dbus-1/services/org.knopwob.dunst.service
mate-notification-daemon: org.freedesktop.Notifications.service usr/share/dbus-1/services/org.freedesktop.mate.Notifications.service
xfce4-notifyd: org.freedesktop.Notifications.service usr/share/dbus-1/services/org.xfce.xfce4-notifyd.Notifications.service
    Similarly, if we try to activate o.fd.N.service with more than one of these installed, we will get a randomly chosen implementation.

---- Potentially deliberately colliding ----

plasma-workspace: org.kde.kuiserver.service usr/share/dbus-1/services/kf5_org.kde.kuiserver.service
    This looks like it might be intended to be parallel-installed with KDE 4?

tumbler: org.freedesktop.thumbnails.Cache1.service usr/share/dbus-1/services/org.xfce.Tumbler.Cache1.service
tumbler: org.freedesktop.thumbnails.Manager1.service usr/share/dbus-1/services/org.xfce.Tumbler.Manager1.service
tumbler: org.freedesktop.thumbnails.Thumbnailer1.service usr/share/dbus-1/services/org.xfce.Tumbler.Thumbnailer1.service
tumbler: org.freedesktop.thumbnails.Cache1.service usr/share/dbus-1/services/org.xfce.Tumbler.Cache1.service
tumbler: org.freedesktop.thumbnails.Manager1.service usr/share/dbus-1/services/org.xfce.Tumbler.Manager1.service
tumbler: org.freedesktop.thumbnails.Thumbnailer1.service usr/share/dbus-1/services/org.xfce.Tumbler.Thumbnailer1.service
    Might be intended to be parallel-installed with other thumbnailers?

---- "Just a bug" ----

blueman: org.blueman.Applet.service usr/share/dbus-1/services/blueman-applet.service
caribou-antler: org.gnome.Caribou.Keyboard.service usr/share/dbus-1/services/org.gnome.Caribou.Antler.service
certmonger: org.fedorahosted.certmonger.service usr/share/dbus-1/services/certmonger.service
command-runner-applet: org.gnome.panel.applet.CommandRunnerAppletFactory.service usr/share/dbus-1/services/CommandRunnerAppletFactory.service
contractor: org.elementary.Contractor.service usr/share/dbus-1/services/org.elementary.contractor.service
epiphany-browser: org.gnome.EpiphanySearchProvider.service usr/share/dbus-1/services/org.gnome.Epiphany.service
evolution-data-server-common: org.gnome.evolution.dataserver.AddressBook9.service usr/share/dbus-1/services/org.gnome.evolution.dataserver.AddressBook.service
evolution-data-server-common: org.gnome.evolution.dataserver.Calendar7.service usr/share/dbus-1/services/org.gnome.evolution.dataserver.Calendar.service
evolution-data-server-common: org.gnome.evolution.dataserver.Sources5.service usr/share/dbus-1/services/org.gnome.evolution.dataserver.Sources.service
evolution-data-server-common: org.gnome.evolution.dataserver.UserPrompter0.service usr/share/dbus-1/services/org.gnome.evolution.dataserver.UserPrompter.service
file-roller: org.gnome.ArchiveManager1.service usr/share/dbus-1/services/org.gnome.FileRoller.ArchiveManager1.service
    org.gnome.ArchiveManager1.service usr/share/dbus-1/services/org.gnome.FileRoller.ArchiveManager1.service
gnome-sushi: org.gnome.NautilusPreviewer.service usr/share/dbus-1/services/org.gnome.Sushi.service
hamster-applet: org.gnome.Hamster.WindowServer.service usr/share/dbus-1/services/org.gnome.hamster.Windows.service
jackd2: org.jackaudio.service.service usr/share/dbus-1/services/org.jackaudio.service
kaccessible: org.kde.kaccessibleapp.service usr/share/dbus-1/services/org.kde.kaccessible.service
libkf5screen-bin: org.kde.KScreen.service usr/share/dbus-1/services/org.kde.kscreen.service
libsocialweb-service: com.meego.libsocialweb.service usr/share/dbus-1/services/libsocialweb.service
obex-data-server: org.openobex.service usr/share/dbus-1/services/obex-data-server.service
presage-dbus: org.gnome.presage.beta.service usr/share/dbus-1/services/org.gnome.presage.service
tictactoe-ng: org.gnome.Empathy.DTubeHandler.org_gnome_TicTacToe.service usr/share/dbus-1/services/org.gnome.Empathy.DTubeHandler.org.gnome.TicTacToe.service
Comment 2 GitLab Migration User 2018-10-12 21:30:10 UTC
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