Methods¶

ListTargets() returns a list all known update targets. It returns an array of structures which consist of a string indicating the target's class (see Target's Class property below for an explanation of the possible values), a string with the name of the target, and the target object path.

ListJobs() returns a list all ongoing jobs. It returns an array of structures which consist of a numeric job ID, a string indicating the job type (see Job's Type property below for an explanation of the possible values), the job's progress, and the job's object path.

ListAppStream() returns an array of all the appstream catalog URLs that this service knows about. See Target's GetAppStream() method below for more details.

Signals¶

The JobRemoved() signal is sent each time a job finishes, is canceled or fails. It also carries the job ID and object path, followed by a numeric status code. If the status is zero, the job has succeed. A positive status should be treated as an exit code (i.e. "EXIT_FAILURE"), and a negative status should be treated as a negative errno-style error code (i.e. "-EINVAL").

Methods¶

List() returns a list of versions available for this target. Additional options may be passed through the flags argument. Valid flags are defined as follows:

#define SD_SYSUPDATE_OFFLINE    (UINT64_C(1) << 0)

When SD_SYSUPDATE_OFFLINE is set, this method returns only the versions installed locally. Otherwise, this method pulls metadata from the network and returns all versions available for this target. Use Describe() to query more information about each version returned by this method.

Describe() returns all known information about a given version as a JSON object. The version argument is used to pass the version to be described. Additional options may be passed through the flags argument. This method supports the same flags as List(). The returned JSON object contains several known keys. More keys may be added in the future. The currently known keys are as follows:

CheckNew() checks if a newer version is available for this target. This method pulls metadata from the network. If a newer version is found, this method returns the version number. If no newer version is found, this method returns an empty string. Use Describe() to query more information about the version returned by this method.

Update() installs an update for this target. If a new_version is specified, that is the version that gets installed. Otherwise, the latest version is installed. The flags argument is added for future extensibility. No flags are currently defined, and the argument is required to be set to "0". Unlike all the other methods in this interface, Update() does not wait for its job to complete. Instead, it returns the job's numeric ID and object path as soon as the job begins, so that the caller can listen for progress updates or cancel the operation. This method also returns the version the target will be updated to, for cases where no version was specified by the caller. This method pulls both metadata and payload data from the network. Listen for the Manager's JobRemoved() signal to detect when the job is complete.

Vacuum() deletes old installed versions of this target to free up space. It returns the number of instances that have been deleted.

GetAppStream() returns a list of HTTP/HTTPS URLs to this target's appstream catalog XML files. If this target has no appstream catalogs, the method will return an empty list. These catalog files can be used by software centers (such as GNOME Software or KDE Discover) to present rich metadata about the target, including a display name, changelog, icon, and more. The returned catalogs will include special metadata to allow the software center to correctly associate the catalogs with this target.

GetVersion() returns the current version of this target, if any. The current version is the newest version that is installed. Note that this isn't necessarily the same thing as the booted or currently-in-use version of the target. For example, on the host system the booted version is the current version most of the time, but if an update is installed and pending a reboot it will become the current version instead. You can query the booted version of the host system via IMAGE_VERSION in /etc/os-release. If the target has no current version, the function will return an empty string.

ListFeatures() returns a list of this target's optional features, by ID. The flags argument is added for future extensibility, and must be set to 0. If the target has no optional features, the method returns an empty array.

DescribeFeature() returns all known information about a given optional feature. The feature argument is used to pass the ID of the feature to be described. The flags argument is added for future extensibility, and must be set to 0. The returned JSON object contains several known keys. More keys may be added in the future. The currently known keys are as follows:

SetFeatureEnabled() writes an appropriate drop-in file to enable or disable the specified optional feature. If enable is zero, the feature is disabled. When greater than zero, the feature is enabled. When less than zero, the feature is reset to the distribution's default. The flags argument is added for future extensibility, and must be set to 0. The feature does not have to exist; this allows for graceful handling of masked features, and for preemptive decisions to be made about features that are planned to appear in future releases of the OS. The drop-in will have a filename of "50-systemd-sysupdate-enabled.conf". This method only changes configuration files; to actually apply the changes, clients will need to call Update(). Depending on the exact needs of the client, it can choose to update the system to the latest available version, or it can extend the newest existing installation in-place (by passing in the version returned by GetVersion()). For now, this method only works with the "host" target.

Properties¶

The Class property exposes the class of this target, which describes where it was enumerated. Possible values include: "machine" for containers and virtual machines managed by systemd-machined.service(8), "portable" for portable services, "sysext" for system extensions managed by systemd-sysext(8), "confext" for configuration extensions managed by systemd-confext(8), "component" for components accepted by the --component= option of systemd-sysupdate(8), and "host" for the host system itself. At most one target will have a class of "host".

The Path property exposes more detail about where this target was found. For "machine", "portable", "extension", and "confext" targets, this is the file path to the image. For "component" and "host" targets, this is the name of a sysupdate.d(5) directory.

The Name property exposes the name of this target. Note that the name is unique within a class but is not necessarily unique between classes. For instance, it is possible to have both a "portable" target named "foobar" and an "extension" target named "foobar", but it is not possible to have two "portable" targets named "foobar".

Security¶

Method calls on this service are authenticated via polkit.

List(), Describe(), and CheckNew() use the polkit action org.freedesktop.sysupdate1.check. By default, this action is permitted without administrator authentication.

Update() uses the polkit action org.freedesktop.sysupdate1.update when no version is specified. By default, this action is permitted without administrator authentication. When a version is specified, org.freedesktop.sysupdate1.update-to-version is used instead. By default, this alternate action requires administrator authentication.

Vacuum() uses the polkit action org.freedesktop.sysupdate1.vacuum. By default, this action requires administrator authentication.

SetFeatureEnabled() uses the polkit action org.freedesktop.sysupdate1.manage-features. By default, this action requires administrator authentication.

GetAppStream(), GetVersion(), ListFeatures(), and DescribeFeature() are unauthenticated and may be called by anybody.

All methods called on this interface expose additional variables to the polkit rules. "class" contains the class of the Target being acted upon, and "name" contains the name of the same Target. Additionally, each method exposes its arguments to the rule. Flags are mapped as follows:

Methods¶

The Cancel() method may be used to cancel the job. It takes no parameters.

Properties¶

The Id property exposes the numeric job ID of the job object.

The Type property exposes the type of operation (one of: "list", "describe", "check-new", "update", "vacuum", or "describe-feature").

The Offline property exposes whether the job is permitted to access the network or not.

The Progress property exposes the current progress of the job as a value between 0 and 100. It is only available for "update" jobs; for all other jobs it is always 0.

Security¶

Cancel() uses the polkit action that corresponds to the method that started this job. For instance, trying to cancel a "list" job will require polkit to permit the org.freedesktop.sysupdate1.check action.

The Manager Object¶

ListTargets(), ListJobs(), ListAppStream(), and JobRemoved() were added in version 257.

The Target Object¶

List(), Describe(), CheckNew(), Update(), Vacuum(), GetAppStream(), GetVersion(), ListFeatures(), DescribeFeature(), SetFeatureEnabled(), Class, Name, and Path were added in version 257.

The Job Object¶

Cancel(), Id, Type, Offline, and Progress were added in version 257.