import "github.com/coreos/go-systemd/dbus"
Integration with the systemd D-Bus API. See http://www.freedesktop.org/wiki/Software/systemd/dbus/
dbus.go methods.go properties.go set.go subscription.go subscription_set.go
PathBusEscape sanitizes a constituent string of a dbus ObjectPath using the rules that systemd uses for serializing special characters.
type Conn struct {
// contains filtered or unexported fields
}
Conn is a connection to systemd's dbus endpoint.
New establishes a connection to any available bus and authenticates. Callers should call Close() when done with the connection.
NewConnection establishes a connection to a bus using a caller-supplied function. This allows connecting to remote buses through a user-supplied mechanism. The supplied function may be called multiple times, and should return independent connections. The returned connection must be fully initialised: the org.freedesktop.DBus.Hello call must have succeeded, and any authentication should be handled by the function.
NewSystemConnection establishes a connection to the system bus and authenticates. Callers should call Close() when done with the connection
NewSystemdConnection establishes a private, direct connection to systemd. This can be used for communicating with systemd without a dbus daemon. Callers should call Close() when done with the connection.
NewUserConnection establishes a connection to the session bus and authenticates. This can be used to connect to systemd user instances. Callers should call Close() when done with the connection.
Close closes an established connection
DisableUnitFiles() may be used to disable one or more units in the system (by removing symlinks to them from /etc or /run).
It takes a list of unit files to disable (either just file names or full absolute paths if the unit files are residing outside the usual unit search paths), and one boolean: whether the unit was enabled for runtime only (true, /run), or persistently (false, /etc).
This call returns an array with the changes made. The changes list consists of structures with three strings: the type of the change (one of symlink or unlink), the file name of the symlink and the destination of the symlink.
func (c *Conn) EnableUnitFiles(files []string, runtime bool, force bool) (bool, []EnableUnitFileChange, error)
EnableUnitFiles() may be used to enable one or more units in the system (by creating symlinks to them in /etc or /run).
It takes a list of unit files to enable (either just file names or full absolute paths if the unit files are residing outside the usual unit search paths), and two booleans: the first controls whether the unit shall be enabled for runtime only (true, /run), or persistently (false, /etc). The second one controls whether symlinks pointing to other units shall be replaced if necessary.
This call returns one boolean and an array with the changes made. The boolean signals whether the unit files contained any enablement information (i.e. an [Install]) section. The changes list consists of structures with three strings: the type of the change (one of symlink or unlink), the file name of the symlink and the destination of the symlink.
GetAllProperties takes the (unescaped) unit name and returns all of its dbus object properties.
GetManagerProperty returns the value of a property on the org.freedesktop.systemd1.Manager interface. The value is returned in its string representation, as defined at https://developer.gnome.org/glib/unstable/gvariant-text.html
GetServiceProperty returns property for given service name and property name
GetUnitPathProperties takes the (escaped) unit path and returns all of its dbus object properties.
GetUnitProperties takes the (unescaped) unit name and returns all of its dbus object properties.
GetUnitTypeProperties returns the extra properties for a unit, specific to the unit type. Valid values for unitType: Service, Socket, Target, Device, Mount, Automount, Snapshot, Timer, Swap, Path, Slice, Scope return "dbus.Error: Unknown interface" if the unitType is not the correct type of the unit
func (c *Conn) GetUnitTypeProperty(unit string, unitType string, propertyName string) (*Property, error)
KillUnit takes the unit name and a UNIX signal number to send. All of the unit's processes are killed.
func (c *Conn) LinkUnitFiles(files []string, runtime bool, force bool) ([]LinkUnitFileChange, error)
LinkUnitFiles() links unit files (that are located outside of the usual unit search paths) into the unit search path.
It takes a list of absolute paths to unit files to link and two booleans. The first boolean controls whether the unit shall be enabled for runtime only (true, /run), or persistently (false, /etc). The second controls whether symlinks pointing to other units shall be replaced if necessary.
This call returns a list of the changes made. The list consists of structures with three strings: the type of the change (one of symlink or unlink), the file name of the symlink and the destination of the symlink.
ListUnitFiles returns an array of all available units on disk.
ListUnitFilesByPatterns returns an array of all available units on disk matched the patterns.
func (c *Conn) ListUnits() ([]UnitStatus, error)
ListUnits returns an array with all currently loaded units. Note that units may be known by multiple names at the same time, and hence there might be more unit names loaded than actual units behind them. Also note that a unit is only loaded if it is active and/or enabled. Units that are both disabled and inactive will thus not be returned.
func (c *Conn) ListUnitsByNames(units []string) ([]UnitStatus, error)
ListUnitsByNames returns an array with units. It takes a list of units' names and returns an UnitStatus array. Comparing to ListUnitsByPatterns method, this method returns statuses even for inactive or non-existing units. Input array should contain exact unit names, but not patterns. Note: Requires systemd v230 or higher
ListUnitsByPatterns returns an array with units. It takes a list of units' statuses and names to filter. Note that units may be known by multiple names at the same time, and hence there might be more unit names loaded than actual units behind them.
func (c *Conn) ListUnitsFiltered(states []string) ([]UnitStatus, error)
ListUnitsFiltered returns an array with units filtered by state. It takes a list of units' statuses to filter.
func (c *Conn) MaskUnitFiles(files []string, runtime bool, force bool) ([]MaskUnitFileChange, error)
MaskUnitFiles masks one or more units in the system
It takes three arguments:
* list of units to mask (either just file names or full absolute paths if the unit files are residing outside the usual unit search paths) * runtime to specify whether the unit was enabled for runtime only (true, /run/systemd/..), or persistently (false, /etc/systemd/..) * force flag
func (conn *Conn) NewSubscriptionSet() *SubscriptionSet
NewSubscriptionSet returns a new subscription set.
Reload instructs systemd to scan for and reload unit files. This is equivalent to a 'systemctl daemon-reload'.
ReloadOrRestartUnit attempts a reload if the unit supports it and use a restart otherwise.
ReloadOrTryRestartUnit attempts a reload if the unit supports it and use a "Try" flavored restart otherwise.
ReloadUnit reloads a unit. Reloading is done only if the unit is already running and fails otherwise.
ResetFailedUnit resets the "failed" state of a specific unit.
RestartUnit restarts a service. If a service is restarted that isn't running it will be started.
func (c *Conn) SetPropertiesSubscriber(updateCh chan<- *PropertiesUpdate, errCh chan<- error)
SetPropertiesSubscriber writes to updateCh when any unit's properties change. Every property change reported by systemd will be sent; that is, no transitions will be "missed" (as they might be with SetSubStateSubscriber). However, state changes will only be written to the channel with non-blocking writes. If updateCh is full, it attempts to write an error to errCh; if errCh is full, the error passes silently.
func (c *Conn) SetSubStateSubscriber(updateCh chan<- *SubStateUpdate, errCh chan<- error)
SetSubStateSubscriber writes to updateCh when any unit's substate changes. Although this writes to updateCh on every state change, the reported state may be more recent than the change that generated it (due to an unavoidable race in the systemd dbus interface). That is, this method provides a good way to keep a current view of all units' states, but is not guaranteed to show every state transition they go through. Furthermore, state changes will only be written to the channel with non-blocking writes. If updateCh is full, it attempts to write an error to errCh; if errCh is full, the error passes silently.
SetUnitProperties() may be used to modify certain unit properties at runtime. Not all properties may be changed at runtime, but many resource management settings (primarily those in systemd.cgroup(5)) may. The changes are applied instantly, and stored on disk for future boots, unless runtime is true, in which case the settings only apply until the next reboot. name is the name of the unit to modify. properties are the settings to set, encoded as an array of property name and value pairs.
func (c *Conn) StartTransientUnit(name string, mode string, properties []Property, ch chan<- string) (int, error)
StartTransientUnit() may be used to create and start a transient unit, which will be released as soon as it is not running or referenced anymore or the system is rebooted. name is the unit name including suffix, and must be unique. mode is the same as in StartUnit(), properties contains properties of the unit.
StartUnit enqueues a start job and depending jobs, if any (unless otherwise specified by the mode string).
Takes the unit to activate, plus a mode string. The mode needs to be one of replace, fail, isolate, ignore-dependencies, ignore-requirements. If "replace" the call will start the unit and its dependencies, possibly replacing already queued jobs that conflict with this. If "fail" the call will start the unit and its dependencies, but will fail if this would change an already queued job. If "isolate" the call will start the unit in question and terminate all units that aren't dependencies of it. If "ignore-dependencies" it will start a unit but ignore all its dependencies. If "ignore-requirements" it will start a unit but only ignore the requirement dependencies. It is not recommended to make use of the latter two options.
If the provided channel is non-nil, a result string will be sent to it upon job completion: one of done, canceled, timeout, failed, dependency, skipped. done indicates successful execution of a job. canceled indicates that a job has been canceled before it finished execution. timeout indicates that the job timeout was reached. failed indicates that the job failed. dependency indicates that a job this job has been depending on failed and the job hence has been removed too. skipped indicates that a job was skipped because it didn't apply to the units current state.
If no error occurs, the ID of the underlying systemd job will be returned. There does exist the possibility for no error to be returned, but for the returned job ID to be 0. In this case, the actual underlying ID is not 0 and this datapoint should not be considered authoritative.
If an error does occur, it will be returned to the user alongside a job ID of 0.
StopUnit is similar to StartUnit but stops the specified unit rather than starting it.
Subscribe sets up this connection to subscribe to all systemd dbus events. This is required before calling SubscribeUnits. When the connection closes systemd will automatically stop sending signals so there is no need to explicitly call Unsubscribe().
func (c *Conn) SubscribeUnits(interval time.Duration) (<-chan map[string]*UnitStatus, <-chan error)
SubscribeUnits returns two unbuffered channels which will receive all changed units every interval. Deleted units are sent as nil.
func (c *Conn) SubscribeUnitsCustom(interval time.Duration, buffer int, isChanged func(*UnitStatus, *UnitStatus) bool, filterUnit func(string) bool) (<-chan map[string]*UnitStatus, <-chan error)
SubscribeUnitsCustom is like SubscribeUnits but lets you specify the buffer size of the channels, the comparison function for detecting changes and a filter function for cutting down on the noise that your channel receives.
SystemState returns the systemd state. Equivalent to `systemctl is-system-running`.
TryRestartUnit is like RestartUnit, except that a service that isn't running is not affected by the restart.
UnmaskUnitFiles unmasks one or more units in the system
It takes two arguments:
* list of unit files to mask (either just file names or full absolute paths if the unit files are residing outside the usual unit search paths) * runtime to specify whether the unit was enabled for runtime only (true, /run/systemd/..), or persistently (false, /etc/systemd/..)
Unsubscribe this connection from systemd dbus events.
type DisableUnitFileChange struct { Type string // Type of the change (one of symlink or unlink) Filename string // File name of the symlink Destination string // Destination of the symlink }
type EnableUnitFileChange struct { Type string // Type of the change (one of symlink or unlink) Filename string // File name of the symlink Destination string // Destination of the symlink }
type LinkUnitFileChange EnableUnitFileChange
type MaskUnitFileChange struct { Type string // Type of the change (one of symlink or unlink) Filename string // File name of the symlink Destination string // Destination of the symlink }
PropertiesUpdate holds a map of a unit's changed properties
PropAfter sets the After unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#After=
PropBefore sets the Before unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Before=
PropBindsTo sets the BindsTo unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#BindsTo=
PropBoundBy sets the BoundBy unit property. See http://www.freedesktop.org/software/systemd/main/systemd.unit.html#BoundBy=
PropConflictedBy sets the ConflictedBy unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#ConflictedBy=
PropConflicts sets the Conflicts unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Conflicts=
PropDescription sets the Description unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit#Description=
PropExecStart sets the ExecStart service property. The first argument is a slice with the binary path to execute followed by the arguments to pass to the executed command. See http://www.freedesktop.org/software/systemd/man/systemd.service.html#ExecStart=
PropOnFailure sets the OnFailure unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#OnFailure=
PropPids sets the PIDs field of scope units used in the initial construction of the scope only and specifies the initial PIDs to add to the scope object. See https://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/#properties
PropPropagatesReloadTo sets the PropagatesReloadTo unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#PropagatesReloadTo=
PropRemainAfterExit sets the RemainAfterExit service property. See http://www.freedesktop.org/software/systemd/man/systemd.service.html#RemainAfterExit=
PropRequiredBy sets the RequiredBy unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiredBy=
PropRequiredByOverridable sets the RequiredByOverridable unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiredByOverridable=
PropRequires sets the Requires unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Requires=
PropRequiresMountsFor sets the RequiresMountsFor unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiresMountsFor=
PropRequiresOverridable sets the RequiresOverridable unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiresOverridable=
PropRequisite sets the Requisite unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Requisite=
PropRequisiteOverridable sets the RequisiteOverridable unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequisiteOverridable=
PropSlice sets the Slice unit property. See http://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#Slice=
PropTriggeredBy sets the TriggeredBy unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#TriggeredBy=
PropTriggers sets the Triggers unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Triggers=
PropType sets the Type service property. See http://www.freedesktop.org/software/systemd/man/systemd.service.html#Type=
PropWantedBy sets the WantedBy unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#WantedBy=
PropWants sets the Wants unit property. See http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Wants=
type SubscriptionSet struct {
// contains filtered or unexported fields
}
SubscriptionSet returns a subscription set which is like conn.Subscribe but can filter to only return events for a set of units.
func (s *SubscriptionSet) Subscribe() (<-chan map[string]*UnitStatus, <-chan error)
Subscribe starts listening for dbus events for all of the units in the set. Returns channels identical to conn.SubscribeUnits.
type UnitStatus struct { Name string // The primary unit name as string Description string // The human readable description string LoadState string // The load state (i.e. whether the unit file has been loaded successfully) ActiveState string // The active state (i.e. whether the unit is currently started or not) SubState string // The sub state (a more fine-grained version of the active state that is specific to the unit type, which the active state is not) Followed string // A unit that is being followed in its state by this unit, if there is any, otherwise the empty string. Path dbus.ObjectPath // The unit object path JobId uint32 // If there is a job queued for the job unit the numeric job id, 0 otherwise JobType string // The job type as string JobPath dbus.ObjectPath // The job object path }
type UnmaskUnitFileChange struct { Type string // Type of the change (one of symlink or unlink) Filename string // File name of the symlink Destination string // Destination of the symlink }
Package dbus imports 11 packages (graph) and is imported by 435 packages. Updated 2019-11-08. Refresh now. Tools for package owners.