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docs: Change prefix for desktop applications to app-
We need both a slice name and a prefix for application units. For consistency we tried to use the same name and ended up standardising on "apps.slice" and and "apps-" prefix for the units. However, "app-" would be a more natural prefix for applications. And it is no problem to simply also name the slice "app.slice" for consistency rather than keeping the current "apps.slice".
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@ -28,11 +28,11 @@ Currently nothing like this is supported or even planned.
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[`systemd.special(7)`](https://www.freedesktop.org/software/systemd/man/systemd.special.html)
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defines the `graphical-session.target` and `graphical-session-pre.target` to
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allow cross-desktop integration. Furthermore, systemd defines the three base
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slices `background`, `apps` and `session`.
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slices `background`, `app` and `session`.
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All units should be placed into one of these slices depending on their purposes:
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* `session.slice`: Contains only processes essential to run the user's graphical session
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* `apps.slice`: Contains all normal applications that the user is running
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* `app.slice`: Contains all normal applications that the user is running
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* `background.slice`: Useful for low-priority background tasks
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The purpose of this grouping is to assign different priorities to the
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@ -42,7 +42,7 @@ preferentially killing background tasks in out-of-memory situations
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or assigning different memory/CPU/IO priorities to ensure that the session
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runs smoothly under load.
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TODO: Will there be a default to place units into e.g. `apps.slice` by default
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TODO: Will there be a default to place units into e.g. `app.slice` by default
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rather than the root slice?
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## XDG standardization for applications
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@ -50,9 +50,9 @@ rather than the root slice?
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To ensure cross-desktop compatibility and encourage sharing of good practices,
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desktop environments should adhere to the following conventions:
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* Application units should follow the scheme `apps-<launcher>-<ApplicationID>-<RANDOM>.service`,
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e.g. `apps-gnome-org.gnome.Evince-12345.service`,
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`apps-flatpak-org.telegram.desktop-12345.service` or `apps-KDE-org.kde.okular-12345.service`.
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* Application units should follow the scheme `app-<launcher>-<ApplicationID>-<RANDOM>.service`,
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e.g. `app-gnome-org.gnome.Evince-12345.service`,
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`app-flatpak-org.telegram.desktop-12345.service` or `app-KDE-org.kde.okular-12345.service`.
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* Using `.service` units instead of `.scope` units, i.e. allowing systemd to
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start the process on behalf of the caller,
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instead of the caller starting the process and letting systemd know about it,
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@ -62,13 +62,13 @@ desktop environments should adhere to the following conventions:
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contain a `-` character.
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This has the following advantages:
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* Using the `apps-<launcher>-` prefix means that the unit defaults can be
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* Using the `app-<launcher>-` prefix means that the unit defaults can be
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adjusted using desktop environment specific drop-in files.
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* The application ID can be retrieved by stripping the prefix and postfix.
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This in turn should map to the corresponding `.desktop` file when available
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TODO: Define the name of slices that should be used.
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This could be `apps-<launcher>-<ApplicationID>-<RANDOM>.slice`.
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This could be `app-<launcher>-<ApplicationID>-<RANDOM>.slice`.
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TODO: Does it really make sense to insert the `<launcher>`? In GNOME I am
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currently using a drop-in to configure `BindTo=graphical-session.target`,
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@ -78,7 +78,7 @@ global default for all (graphical) applications.
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* Should application lifetime be bound to the session?
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* May the user have applications that do not belong to the graphical session (e.g. launched from SSH)?
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* Could we maybe add a default `apps-.service.d` drop-in configuration?
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* Could we maybe add a default `app-.service.d` drop-in configuration?
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## XDG autostart integration
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