github/containerd
4
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 2 Wiki Activity

Adding option to configure cgroup to start cri-containerd

Browse Source 
Signed-off-by: Abhinandan Prativadi <abhi@docker.com>
This commit is contained in:
Abhinandan Prativadi
2017-08-29 15:14:10 -07:00
parent 80b57f54a6
commit e1edeae4c9
78 changed files with 10680 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

191
vendor/github.com/coreos/go-systemd/LICENSE generated vendored Normal file
View File

@@ -0,0 +1,191 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction, and
distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by the copyright
owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all other entities
that control, are controlled by, or are under common control with that entity.
For the purposes of this definition, "control" means (i) the power, direct or
indirect, to cause the direction or management of such entity, whether by
contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity exercising
permissions granted by this License.
"Source" form shall mean the preferred form for making modifications, including
but not limited to software source code, documentation source, and configuration
files.
"Object" form shall mean any form resulting from mechanical transformation or
translation of a Source form, including but not limited to compiled object code,
generated documentation, and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or Object form, made
available under the License, as indicated by a copyright notice that is included
in or attached to the work (an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object form, that
is based on (or derived from) the Work and for which the editorial revisions,
annotations, elaborations, or other modifications represent, as a whole, an
original work of authorship. For the purposes of this License, Derivative Works
shall not include works that remain separable from, or merely link (or bind by
name) to the interfaces of, the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including the original version
of the Work and any modifications or additions to that Work or Derivative Works
thereof, that is intentionally submitted to Licensor for inclusion in the Work
by the copyright owner or by an individual or Legal Entity authorized to submit
on behalf of the copyright owner. For the purposes of this definition,
"submitted" means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems, and
issue tracking systems that are managed by, or on behalf of, the Licensor for
the purpose of discussing and improving the Work, but excluding communication
that is conspicuously marked or otherwise designated in writing by the copyright
owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity on behalf
of whom a Contribution has been received by Licensor and subsequently
incorporated within the Work.
2. Grant of Copyright License.
Subject to the terms and conditions of this License, each Contributor hereby
grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
irrevocable copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the Work and such
Derivative Works in Source or Object form.
3. Grant of Patent License.
Subject to the terms and conditions of this License, each Contributor hereby
grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
irrevocable (except as stated in this section) patent license to make, have
made, use, offer to sell, sell, import, and otherwise transfer the Work, where
such license applies only to those patent claims licensable by such Contributor
that are necessarily infringed by their Contribution(s) alone or by combination
of their Contribution(s) with the Work to which such Contribution(s) was
submitted. If You institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work or a
Contribution incorporated within the Work constitutes direct or contributory
patent infringement, then any patent licenses granted to You under this License
for that Work shall terminate as of the date such litigation is filed.
4. Redistribution.
You may reproduce and distribute copies of the Work or Derivative Works thereof
in any medium, with or without modifications, and in Source or Object form,
provided that You meet the following conditions:
You must give any other recipients of the Work or Derivative Works a copy of
this License; and
You must cause any modified files to carry prominent notices stating that You
changed the files; and
You must retain, in the Source form of any Derivative Works that You distribute,
all copyright, patent, trademark, and attribution notices from the Source form
of the Work, excluding those notices that do not pertain to any part of the
Derivative Works; and
If the Work includes a "NOTICE" text file as part of its distribution, then any
Derivative Works that You distribute must include a readable copy of the
attribution notices contained within such NOTICE file, excluding those notices
that do not pertain to any part of the Derivative Works, in at least one of the
following places: within a NOTICE text file distributed as part of the
Derivative Works; within the Source form or documentation, if provided along
with the Derivative Works; or, within a display generated by the Derivative
Works, if and wherever such third-party notices normally appear. The contents of
the NOTICE file are for informational purposes only and do not modify the
License. You may add Your own attribution notices within Derivative Works that
You distribute, alongside or as an addendum to the NOTICE text from the Work,
provided that such additional attribution notices cannot be construed as
modifying the License.
You may add Your own copyright statement to Your modifications and may provide
additional or different license terms and conditions for use, reproduction, or
distribution of Your modifications, or for any such Derivative Works as a whole,
provided Your use, reproduction, and distribution of the Work otherwise complies
with the conditions stated in this License.
5. Submission of Contributions.
Unless You explicitly state otherwise, any Contribution intentionally submitted
for inclusion in the Work by You to the Licensor shall be under the terms and
conditions of this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify the terms of
any separate license agreement you may have executed with Licensor regarding
such Contributions.
6. Trademarks.
This License does not grant permission to use the trade names, trademarks,
service marks, or product names of the Licensor, except as required for
reasonable and customary use in describing the origin of the Work and
reproducing the content of the NOTICE file.
7. Disclaimer of Warranty.
Unless required by applicable law or agreed to in writing, Licensor provides the
Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
including, without limitation, any warranties or conditions of TITLE,
NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
solely responsible for determining the appropriateness of using or
redistributing the Work and assume any risks associated with Your exercise of
permissions under this License.
8. Limitation of Liability.
In no event and under no legal theory, whether in tort (including negligence),
contract, or otherwise, unless required by applicable law (such as deliberate
and grossly negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special, incidental,
or consequential damages of any character arising as a result of this License or
out of the use or inability to use the Work (including but not limited to
damages for loss of goodwill, work stoppage, computer failure or malfunction, or
any and all other commercial damages or losses), even if such Contributor has
been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability.
While redistributing the Work or Derivative Works thereof, You may choose to
offer, and charge a fee for, acceptance of support, warranty, indemnity, or
other liability obligations and/or rights consistent with this License. However,
in accepting such obligations, You may act only on Your own behalf and on Your
sole responsibility, not on behalf of any other Contributor, and only if You
agree to indemnify, defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason of your
accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work
To apply the Apache License to your work, attach the following boilerplate
notice, with the fields enclosed by brackets "[]" replaced with your own
identifying information. (Don't include the brackets!) The text should be
enclosed in the appropriate comment syntax for the file format. We also
recommend that a file or class name and description of purpose be included on
the same "printed page" as the copyright notice for easier identification within
third-party archives.
Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

54
vendor/github.com/coreos/go-systemd/README.md generated vendored Normal file
View File

@@ -0,0 +1,54 @@
# go-systemd
[![Build Status](https://travis-ci.org/coreos/go-systemd.png?branch=master)](https://travis-ci.org/coreos/go-systemd)
[![godoc](https://godoc.org/github.com/coreos/go-systemd?status.svg)](http://godoc.org/github.com/coreos/go-systemd)
Go bindings to systemd. The project has several packages:
- `activation` - for writing and using socket activation from Go
- `dbus` - for starting/stopping/inspecting running services and units
- `journal` - for writing to systemd's logging service, journald
- `sdjournal` - for reading from journald by wrapping its C API
- `machine1` - for registering machines/containers with systemd
- `unit` - for (de)serialization and comparison of unit files
## Socket Activation
An example HTTP server using socket activation can be quickly set up by following this README on a Linux machine running systemd:
https://github.com/coreos/go-systemd/tree/master/examples/activation/httpserver
## Journal
Using the pure-Go `journal` package you can submit journal entries directly to systemd's journal, taking advantage of features like indexed key/value pairs for each log entry.
The `sdjournal` package provides read access to the journal by wrapping around journald's native C API; consequently it requires cgo and the journal headers to be available.
## D-Bus
The `dbus` package connects to the [systemd D-Bus API](http://www.freedesktop.org/wiki/Software/systemd/dbus/) and lets you start, stop and introspect systemd units. The API docs are here:
http://godoc.org/github.com/coreos/go-systemd/dbus
### Debugging
Create `/etc/dbus-1/system-local.conf` that looks like this:
```
<!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<policy user="root">
<allow eavesdrop="true"/>
<allow eavesdrop="true" send_destination="*"/>
</policy>
</busconfig>
```
## machined
The `machine1` package allows interaction with the [systemd machined D-Bus API](http://www.freedesktop.org/wiki/Software/systemd/machined/).
## Units
The `unit` package provides various functions for working with [systemd unit files](http://www.freedesktop.org/software/systemd/man/systemd.unit.html).

213
vendor/github.com/coreos/go-systemd/dbus/dbus.go generated vendored Normal file
View File

@@ -0,0 +1,213 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Integration with the systemd D-Bus API. See http://www.freedesktop.org/wiki/Software/systemd/dbus/
package dbus
import (
"fmt"
"os"
"strconv"
"strings"
"sync"
"github.com/godbus/dbus"
)
const (
alpha = `abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ`
num = `0123456789`
alphanum = alpha + num
signalBuffer = 100
)
// needsEscape checks whether a byte in a potential dbus ObjectPath needs to be escaped
func needsEscape(i int, b byte) bool {
// Escape everything that is not a-z-A-Z-0-9
// Also escape 0-9 if it's the first character
return strings.IndexByte(alphanum, b) == -1 ||
(i == 0 && strings.IndexByte(num, b) != -1)
}
// PathBusEscape sanitizes a constituent string of a dbus ObjectPath using the
// rules that systemd uses for serializing special characters.
func PathBusEscape(path string) string {
// Special case the empty string
if len(path) == 0 {
return "_"
}
n := []byte{}
for i := 0; i < len(path); i++ {
c := path[i]
if needsEscape(i, c) {
e := fmt.Sprintf("_%x", c)
n = append(n, []byte(e)...)
} else {
n = append(n, c)
}
}
return string(n)
}
// Conn is a connection to systemd's dbus endpoint.
type Conn struct {
// sysconn/sysobj are only used to call dbus methods
sysconn *dbus.Conn
sysobj dbus.BusObject
// sigconn/sigobj are only used to receive dbus signals
sigconn *dbus.Conn
sigobj dbus.BusObject
jobListener struct {
jobs map[dbus.ObjectPath]chan<- string
sync.Mutex
}
subscriber struct {
updateCh chan<- *SubStateUpdate
errCh chan<- error
sync.Mutex
ignore map[dbus.ObjectPath]int64
cleanIgnore int64
}
}
// New establishes a connection to any available bus and authenticates.
// Callers should call Close() when done with the connection.
func New() (*Conn, error) {
conn, err := NewSystemConnection()
if err != nil && os.Geteuid() == 0 {
return NewSystemdConnection()
}
return conn, err
}
// NewSystemConnection establishes a connection to the system bus and authenticates.
// Callers should call Close() when done with the connection
func NewSystemConnection() (*Conn, error) {
return NewConnection(func() (*dbus.Conn, error) {
return dbusAuthHelloConnection(dbus.SystemBusPrivate)
})
}
// 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.
func NewUserConnection() (*Conn, error) {
return NewConnection(func() (*dbus.Conn, error) {
return dbusAuthHelloConnection(dbus.SessionBusPrivate)
})
}
// 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.
func NewSystemdConnection() (*Conn, error) {
return NewConnection(func() (*dbus.Conn, error) {
// We skip Hello when talking directly to systemd.
return dbusAuthConnection(func() (*dbus.Conn, error) {
return dbus.Dial("unix:path=/run/systemd/private")
})
})
}
// Close closes an established connection
func (c *Conn) Close() {
c.sysconn.Close()
c.sigconn.Close()
}
// 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.
func NewConnection(dialBus func() (*dbus.Conn, error)) (*Conn, error) {
sysconn, err := dialBus()
if err != nil {
return nil, err
}
sigconn, err := dialBus()
if err != nil {
sysconn.Close()
return nil, err
}
c := &Conn{
sysconn: sysconn,
sysobj: systemdObject(sysconn),
sigconn: sigconn,
sigobj: systemdObject(sigconn),
}
c.subscriber.ignore = make(map[dbus.ObjectPath]int64)
c.jobListener.jobs = make(map[dbus.ObjectPath]chan<- string)
// Setup the listeners on jobs so that we can get completions
c.sigconn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal', interface='org.freedesktop.systemd1.Manager', member='JobRemoved'")
c.dispatch()
return c, nil
}
// 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
func (c *Conn) GetManagerProperty(prop string) (string, error) {
variant, err := c.sysobj.GetProperty("org.freedesktop.systemd1.Manager." + prop)
if err != nil {
return "", err
}
return variant.String(), nil
}
func dbusAuthConnection(createBus func() (*dbus.Conn, error)) (*dbus.Conn, error) {
conn, err := createBus()
if err != nil {
return nil, err
}
// Only use EXTERNAL method, and hardcode the uid (not username)
// to avoid a username lookup (which requires a dynamically linked
// libc)
methods := []dbus.Auth{dbus.AuthExternal(strconv.Itoa(os.Getuid()))}
err = conn.Auth(methods)
if err != nil {
conn.Close()
return nil, err
}
return conn, nil
}
func dbusAuthHelloConnection(createBus func() (*dbus.Conn, error)) (*dbus.Conn, error) {
conn, err := dbusAuthConnection(createBus)
if err != nil {
return nil, err
}
if err = conn.Hello(); err != nil {
conn.Close()
return nil, err
}
return conn, nil
}
func systemdObject(conn *dbus.Conn) dbus.BusObject {
return conn.Object("org.freedesktop.systemd1", dbus.ObjectPath("/org/freedesktop/systemd1"))
}

565
vendor/github.com/coreos/go-systemd/dbus/methods.go generated vendored Normal file
View File

@@ -0,0 +1,565 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbus
import (
"errors"
"path"
"strconv"
"github.com/godbus/dbus"
)
func (c *Conn) jobComplete(signal *dbus.Signal) {
var id uint32
var job dbus.ObjectPath
var unit string
var result string
dbus.Store(signal.Body, &id, &job, &unit, &result)
c.jobListener.Lock()
out, ok := c.jobListener.jobs[job]
if ok {
out <- result
delete(c.jobListener.jobs, job)
}
c.jobListener.Unlock()
}
func (c *Conn) startJob(ch chan<- string, job string, args ...interface{}) (int, error) {
if ch != nil {
c.jobListener.Lock()
defer c.jobListener.Unlock()
}
var p dbus.ObjectPath
err := c.sysobj.Call(job, 0, args...).Store(&p)
if err != nil {
return 0, err
}
if ch != nil {
c.jobListener.jobs[p] = ch
}
// ignore error since 0 is fine if conversion fails
jobID, _ := strconv.Atoi(path.Base(string(p)))
return jobID, nil
}
// 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.
func (c *Conn) StartUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.StartUnit", name, mode)
}
// StopUnit is similar to StartUnit but stops the specified unit rather
// than starting it.
func (c *Conn) StopUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.StopUnit", name, mode)
}
// ReloadUnit reloads a unit. Reloading is done only if the unit is already running and fails otherwise.
func (c *Conn) ReloadUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.ReloadUnit", name, mode)
}
// RestartUnit restarts a service. If a service is restarted that isn't
// running it will be started.
func (c *Conn) RestartUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.RestartUnit", name, mode)
}
// TryRestartUnit is like RestartUnit, except that a service that isn't running
// is not affected by the restart.
func (c *Conn) TryRestartUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.TryRestartUnit", name, mode)
}
// ReloadOrRestart attempts a reload if the unit supports it and use a restart
// otherwise.
func (c *Conn) ReloadOrRestartUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.ReloadOrRestartUnit", name, mode)
}
// ReloadOrTryRestart attempts a reload if the unit supports it and use a "Try"
// flavored restart otherwise.
func (c *Conn) ReloadOrTryRestartUnit(name string, mode string, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.ReloadOrTryRestartUnit", name, mode)
}
// 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.
func (c *Conn) StartTransientUnit(name string, mode string, properties []Property, ch chan<- string) (int, error) {
return c.startJob(ch, "org.freedesktop.systemd1.Manager.StartTransientUnit", name, mode, properties, make([]PropertyCollection, 0))
}
// KillUnit takes the unit name and a UNIX signal number to send. All of the unit's
// processes are killed.
func (c *Conn) KillUnit(name string, signal int32) {
c.sysobj.Call("org.freedesktop.systemd1.Manager.KillUnit", 0, name, "all", signal).Store()
}
// ResetFailedUnit resets the "failed" state of a specific unit.
func (c *Conn) ResetFailedUnit(name string) error {
return c.sysobj.Call("org.freedesktop.systemd1.Manager.ResetFailedUnit", 0, name).Store()
}
// getProperties takes the unit name and returns all of its dbus object properties, for the given dbus interface
func (c *Conn) getProperties(unit string, dbusInterface string) (map[string]interface{}, error) {
var err error
var props map[string]dbus.Variant
path := unitPath(unit)
if !path.IsValid() {
return nil, errors.New("invalid unit name: " + unit)
}
obj := c.sysconn.Object("org.freedesktop.systemd1", path)
err = obj.Call("org.freedesktop.DBus.Properties.GetAll", 0, dbusInterface).Store(&props)
if err != nil {
return nil, err
}
out := make(map[string]interface{}, len(props))
for k, v := range props {
out[k] = v.Value()
}
return out, nil
}
// GetUnitProperties takes the unit name and returns all of its dbus object properties.
func (c *Conn) GetUnitProperties(unit string) (map[string]interface{}, error) {
return c.getProperties(unit, "org.freedesktop.systemd1.Unit")
}
func (c *Conn) getProperty(unit string, dbusInterface string, propertyName string) (*Property, error) {
var err error
var prop dbus.Variant
path := unitPath(unit)
if !path.IsValid() {
return nil, errors.New("invalid unit name: " + unit)
}
obj := c.sysconn.Object("org.freedesktop.systemd1", path)
err = obj.Call("org.freedesktop.DBus.Properties.Get", 0, dbusInterface, propertyName).Store(&prop)
if err != nil {
return nil, err
}
return &Property{Name: propertyName, Value: prop}, nil
}
func (c *Conn) GetUnitProperty(unit string, propertyName string) (*Property, error) {
return c.getProperty(unit, "org.freedesktop.systemd1.Unit", propertyName)
}
// GetServiceProperty returns property for given service name and property name
func (c *Conn) GetServiceProperty(service string, propertyName string) (*Property, error) {
return c.getProperty(service, "org.freedesktop.systemd1.Service", propertyName)
}
// 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) GetUnitTypeProperties(unit string, unitType string) (map[string]interface{}, error) {
return c.getProperties(unit, "org.freedesktop.systemd1."+unitType)
}
// 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) SetUnitProperties(name string, runtime bool, properties ...Property) error {
return c.sysobj.Call("org.freedesktop.systemd1.Manager.SetUnitProperties", 0, name, runtime, properties).Store()
}
func (c *Conn) GetUnitTypeProperty(unit string, unitType string, propertyName string) (*Property, error) {
return c.getProperty(unit, "org.freedesktop.systemd1."+unitType, propertyName)
}
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 storeFunc func(retvalues ...interface{}) error
func (c *Conn) listUnitsInternal(f storeFunc) ([]UnitStatus, error) {
result := make([][]interface{}, 0)
err := f(&result)
if err != nil {
return nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
status := make([]UnitStatus, len(result))
statusInterface := make([]interface{}, len(status))
for i := range status {
statusInterface[i] = &status[i]
}
err = dbus.Store(resultInterface, statusInterface...)
if err != nil {
return nil, err
}
return status, nil
}
// 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.
func (c *Conn) ListUnits() ([]UnitStatus, error) {
return c.listUnitsInternal(c.sysobj.Call("org.freedesktop.systemd1.Manager.ListUnits", 0).Store)
}
// ListUnitsFiltered returns an array with units filtered by state.
// It takes a list of units' statuses to filter.
func (c *Conn) ListUnitsFiltered(states []string) ([]UnitStatus, error) {
return c.listUnitsInternal(c.sysobj.Call("org.freedesktop.systemd1.Manager.ListUnitsFiltered", 0, states).Store)
}
// 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) ListUnitsByPatterns(states []string, patterns []string) ([]UnitStatus, error) {
return c.listUnitsInternal(c.sysobj.Call("org.freedesktop.systemd1.Manager.ListUnitsByPatterns", 0, states, patterns).Store)
}
// 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.
func (c *Conn) ListUnitsByNames(units []string) ([]UnitStatus, error) {
return c.listUnitsInternal(c.sysobj.Call("org.freedesktop.systemd1.Manager.ListUnitsByNames", 0, units).Store)
}
type UnitFile struct {
Path string
Type string
}
func (c *Conn) listUnitFilesInternal(f storeFunc) ([]UnitFile, error) {
result := make([][]interface{}, 0)
err := f(&result)
if err != nil {
return nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
files := make([]UnitFile, len(result))
fileInterface := make([]interface{}, len(files))
for i := range files {
fileInterface[i] = &files[i]
}
err = dbus.Store(resultInterface, fileInterface...)
if err != nil {
return nil, err
}
return files, nil
}
// ListUnitFiles returns an array of all available units on disk.
func (c *Conn) ListUnitFiles() ([]UnitFile, error) {
return c.listUnitFilesInternal(c.sysobj.Call("org.freedesktop.systemd1.Manager.ListUnitFiles", 0).Store)
}
// ListUnitFilesByPatterns returns an array of all available units on disk matched the patterns.
func (c *Conn) ListUnitFilesByPatterns(states []string, patterns []string) ([]UnitFile, error) {
return c.listUnitFilesInternal(c.sysobj.Call("org.freedesktop.systemd1.Manager.ListUnitFilesByPatterns", 0, states, patterns).Store)
}
type LinkUnitFileChange EnableUnitFileChange
// 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.
func (c *Conn) LinkUnitFiles(files []string, runtime bool, force bool) ([]LinkUnitFileChange, error) {
result := make([][]interface{}, 0)
err := c.sysobj.Call("org.freedesktop.systemd1.Manager.LinkUnitFiles", 0, files, runtime, force).Store(&result)
if err != nil {
return nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
changes := make([]LinkUnitFileChange, len(result))
changesInterface := make([]interface{}, len(changes))
for i := range changes {
changesInterface[i] = &changes[i]
}
err = dbus.Store(resultInterface, changesInterface...)
if err != nil {
return nil, err
}
return changes, nil
}
// 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.
func (c *Conn) EnableUnitFiles(files []string, runtime bool, force bool) (bool, []EnableUnitFileChange, error) {
var carries_install_info bool
result := make([][]interface{}, 0)
err := c.sysobj.Call("org.freedesktop.systemd1.Manager.EnableUnitFiles", 0, files, runtime, force).Store(&carries_install_info, &result)
if err != nil {
return false, nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
changes := make([]EnableUnitFileChange, len(result))
changesInterface := make([]interface{}, len(changes))
for i := range changes {
changesInterface[i] = &changes[i]
}
err = dbus.Store(resultInterface, changesInterface...)
if err != nil {
return false, nil, err
}
return carries_install_info, changes, nil
}
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
}
// 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) DisableUnitFiles(files []string, runtime bool) ([]DisableUnitFileChange, error) {
result := make([][]interface{}, 0)
err := c.sysobj.Call("org.freedesktop.systemd1.Manager.DisableUnitFiles", 0, files, runtime).Store(&result)
if err != nil {
return nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
changes := make([]DisableUnitFileChange, len(result))
changesInterface := make([]interface{}, len(changes))
for i := range changes {
changesInterface[i] = &changes[i]
}
err = dbus.Store(resultInterface, changesInterface...)
if err != nil {
return nil, err
}
return changes, nil
}
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
}
// 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 (c *Conn) MaskUnitFiles(files []string, runtime bool, force bool) ([]MaskUnitFileChange, error) {
result := make([][]interface{}, 0)
err := c.sysobj.Call("org.freedesktop.systemd1.Manager.MaskUnitFiles", 0, files, runtime, force).Store(&result)
if err != nil {
return nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
changes := make([]MaskUnitFileChange, len(result))
changesInterface := make([]interface{}, len(changes))
for i := range changes {
changesInterface[i] = &changes[i]
}
err = dbus.Store(resultInterface, changesInterface...)
if err != nil {
return nil, err
}
return changes, nil
}
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
}
// 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/..)
func (c *Conn) UnmaskUnitFiles(files []string, runtime bool) ([]UnmaskUnitFileChange, error) {
result := make([][]interface{}, 0)
err := c.sysobj.Call("org.freedesktop.systemd1.Manager.UnmaskUnitFiles", 0, files, runtime).Store(&result)
if err != nil {
return nil, err
}
resultInterface := make([]interface{}, len(result))
for i := range result {
resultInterface[i] = result[i]
}
changes := make([]UnmaskUnitFileChange, len(result))
changesInterface := make([]interface{}, len(changes))
for i := range changes {
changesInterface[i] = &changes[i]
}
err = dbus.Store(resultInterface, changesInterface...)
if err != nil {
return nil, err
}
return changes, nil
}
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
}
// Reload instructs systemd to scan for and reload unit files. This is
// equivalent to a 'systemctl daemon-reload'.
func (c *Conn) Reload() error {
return c.sysobj.Call("org.freedesktop.systemd1.Manager.Reload", 0).Store()
}
func unitPath(name string) dbus.ObjectPath {
return dbus.ObjectPath("/org/freedesktop/systemd1/unit/" + PathBusEscape(name))
}

237
vendor/github.com/coreos/go-systemd/dbus/properties.go generated vendored Normal file
View File

@@ -0,0 +1,237 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbus
import (
"github.com/godbus/dbus"
)
// From the systemd docs:
//
// The properties array of StartTransientUnit() may take many of the settings
// that may also be configured in unit files. Not all parameters are currently
// accepted though, but we plan to cover more properties with future release.
// Currently you may set the Description, Slice and all dependency types of
// units, as well as RemainAfterExit, ExecStart for service units,
// TimeoutStopUSec and PIDs for scope units, and CPUAccounting, CPUShares,
// BlockIOAccounting, BlockIOWeight, BlockIOReadBandwidth,
// BlockIOWriteBandwidth, BlockIODeviceWeight, MemoryAccounting, MemoryLimit,
// DevicePolicy, DeviceAllow for services/scopes/slices. These fields map
// directly to their counterparts in unit files and as normal D-Bus object
// properties. The exception here is the PIDs field of scope units which is
// used for construction of the scope only and specifies the initial PIDs to
// add to the scope object.
type Property struct {
Name string
Value dbus.Variant
}
type PropertyCollection struct {
Name string
Properties []Property
}
type execStart struct {
Path string // the binary path to execute
Args []string // an array with all arguments to pass to the executed command, starting with argument 0
UncleanIsFailure bool // a boolean whether it should be considered a failure if the process exits uncleanly
}
// 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=
func PropExecStart(command []string, uncleanIsFailure bool) Property {
execStarts := []execStart{
execStart{
Path: command[0],
Args: command,
UncleanIsFailure: uncleanIsFailure,
},
}
return Property{
Name: "ExecStart",
Value: dbus.MakeVariant(execStarts),
}
}
// PropRemainAfterExit sets the RemainAfterExit service property. See
// http://www.freedesktop.org/software/systemd/man/systemd.service.html#RemainAfterExit=
func PropRemainAfterExit(b bool) Property {
return Property{
Name: "RemainAfterExit",
Value: dbus.MakeVariant(b),
}
}
// PropType sets the Type service property. See
// http://www.freedesktop.org/software/systemd/man/systemd.service.html#Type=
func PropType(t string) Property {
return Property{
Name: "Type",
Value: dbus.MakeVariant(t),
}
}
// PropDescription sets the Description unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit#Description=
func PropDescription(desc string) Property {
return Property{
Name: "Description",
Value: dbus.MakeVariant(desc),
}
}
func propDependency(name string, units []string) Property {
return Property{
Name: name,
Value: dbus.MakeVariant(units),
}
}
// PropRequires sets the Requires unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Requires=
func PropRequires(units ...string) Property {
return propDependency("Requires", units)
}
// PropRequiresOverridable sets the RequiresOverridable unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiresOverridable=
func PropRequiresOverridable(units ...string) Property {
return propDependency("RequiresOverridable", units)
}
// PropRequisite sets the Requisite unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Requisite=
func PropRequisite(units ...string) Property {
return propDependency("Requisite", units)
}
// PropRequisiteOverridable sets the RequisiteOverridable unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequisiteOverridable=
func PropRequisiteOverridable(units ...string) Property {
return propDependency("RequisiteOverridable", units)
}
// PropWants sets the Wants unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Wants=
func PropWants(units ...string) Property {
return propDependency("Wants", units)
}
// PropBindsTo sets the BindsTo unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#BindsTo=
func PropBindsTo(units ...string) Property {
return propDependency("BindsTo", units)
}
// PropRequiredBy sets the RequiredBy unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiredBy=
func PropRequiredBy(units ...string) Property {
return propDependency("RequiredBy", units)
}
// PropRequiredByOverridable sets the RequiredByOverridable unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiredByOverridable=
func PropRequiredByOverridable(units ...string) Property {
return propDependency("RequiredByOverridable", units)
}
// PropWantedBy sets the WantedBy unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#WantedBy=
func PropWantedBy(units ...string) Property {
return propDependency("WantedBy", units)
}
// PropBoundBy sets the BoundBy unit property. See
// http://www.freedesktop.org/software/systemd/main/systemd.unit.html#BoundBy=
func PropBoundBy(units ...string) Property {
return propDependency("BoundBy", units)
}
// PropConflicts sets the Conflicts unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Conflicts=
func PropConflicts(units ...string) Property {
return propDependency("Conflicts", units)
}
// PropConflictedBy sets the ConflictedBy unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#ConflictedBy=
func PropConflictedBy(units ...string) Property {
return propDependency("ConflictedBy", units)
}
// PropBefore sets the Before unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Before=
func PropBefore(units ...string) Property {
return propDependency("Before", units)
}
// PropAfter sets the After unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#After=
func PropAfter(units ...string) Property {
return propDependency("After", units)
}
// PropOnFailure sets the OnFailure unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#OnFailure=
func PropOnFailure(units ...string) Property {
return propDependency("OnFailure", units)
}
// PropTriggers sets the Triggers unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Triggers=
func PropTriggers(units ...string) Property {
return propDependency("Triggers", units)
}
// PropTriggeredBy sets the TriggeredBy unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#TriggeredBy=
func PropTriggeredBy(units ...string) Property {
return propDependency("TriggeredBy", units)
}
// PropPropagatesReloadTo sets the PropagatesReloadTo unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#PropagatesReloadTo=
func PropPropagatesReloadTo(units ...string) Property {
return propDependency("PropagatesReloadTo", units)
}
// PropRequiresMountsFor sets the RequiresMountsFor unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.unit.html#RequiresMountsFor=
func PropRequiresMountsFor(units ...string) Property {
return propDependency("RequiresMountsFor", units)
}
// PropSlice sets the Slice unit property. See
// http://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#Slice=
func PropSlice(slice string) Property {
return Property{
Name: "Slice",
Value: dbus.MakeVariant(slice),
}
}
// 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
func PropPids(pids ...uint32) Property {
return Property{
Name: "PIDs",
Value: dbus.MakeVariant(pids),
}
}

47
vendor/github.com/coreos/go-systemd/dbus/set.go generated vendored Normal file
View File

@@ -0,0 +1,47 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbus
type set struct {
data map[string]bool
}
func (s *set) Add(value string) {
s.data[value] = true
}
func (s *set) Remove(value string) {
delete(s.data, value)
}
func (s *set) Contains(value string) (exists bool) {
_, exists = s.data[value]
return
}
func (s *set) Length() int {
return len(s.data)
}
func (s *set) Values() (values []string) {
for val, _ := range s.data {
values = append(values, val)
}
return
}
func newSet() *set {
return &set{make(map[string]bool)}
}

250
vendor/github.com/coreos/go-systemd/dbus/subscription.go generated vendored Normal file
View File

@@ -0,0 +1,250 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbus
import (
"errors"
"time"
"github.com/godbus/dbus"
)
const (
cleanIgnoreInterval = int64(10 * time.Second)
ignoreInterval = int64(30 * time.Millisecond)
)
// 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) Subscribe() error {
c.sigconn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal',interface='org.freedesktop.systemd1.Manager',member='UnitNew'")
c.sigconn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal',interface='org.freedesktop.DBus.Properties',member='PropertiesChanged'")
err := c.sigobj.Call("org.freedesktop.systemd1.Manager.Subscribe", 0).Store()
if err != nil {
return err
}
return nil
}
// Unsubscribe this connection from systemd dbus events.
func (c *Conn) Unsubscribe() error {
err := c.sigobj.Call("org.freedesktop.systemd1.Manager.Unsubscribe", 0).Store()
if err != nil {
return err
}
return nil
}
func (c *Conn) dispatch() {
ch := make(chan *dbus.Signal, signalBuffer)
c.sigconn.Signal(ch)
go func() {
for {
signal, ok := <-ch
if !ok {
return
}
if signal.Name == "org.freedesktop.systemd1.Manager.JobRemoved" {
c.jobComplete(signal)
}
if c.subscriber.updateCh == nil {
continue
}
var unitPath dbus.ObjectPath
switch signal.Name {
case "org.freedesktop.systemd1.Manager.JobRemoved":
unitName := signal.Body[2].(string)
c.sysobj.Call("org.freedesktop.systemd1.Manager.GetUnit", 0, unitName).Store(&unitPath)
case "org.freedesktop.systemd1.Manager.UnitNew":
unitPath = signal.Body[1].(dbus.ObjectPath)
case "org.freedesktop.DBus.Properties.PropertiesChanged":
if signal.Body[0].(string) == "org.freedesktop.systemd1.Unit" {
unitPath = signal.Path
}
}
if unitPath == dbus.ObjectPath("") {
continue
}
c.sendSubStateUpdate(unitPath)
}
}()
}
// Returns two unbuffered channels which will receive all changed units every
// interval. Deleted units are sent as nil.
func (c *Conn) SubscribeUnits(interval time.Duration) (<-chan map[string]*UnitStatus, <-chan error) {
return c.SubscribeUnitsCustom(interval, 0, func(u1, u2 *UnitStatus) bool { return *u1 != *u2 }, nil)
}
// 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.
func (c *Conn) SubscribeUnitsCustom(interval time.Duration, buffer int, isChanged func(*UnitStatus, *UnitStatus) bool, filterUnit func(string) bool) (<-chan map[string]*UnitStatus, <-chan error) {
old := make(map[string]*UnitStatus)
statusChan := make(chan map[string]*UnitStatus, buffer)
errChan := make(chan error, buffer)
go func() {
for {
timerChan := time.After(interval)
units, err := c.ListUnits()
if err == nil {
cur := make(map[string]*UnitStatus)
for i := range units {
if filterUnit != nil && filterUnit(units[i].Name) {
continue
}
cur[units[i].Name] = &units[i]
}
// add all new or changed units
changed := make(map[string]*UnitStatus)
for n, u := range cur {
if oldU, ok := old[n]; !ok || isChanged(oldU, u) {
changed[n] = u
}
delete(old, n)
}
// add all deleted units
for oldN := range old {
changed[oldN] = nil
}
old = cur
if len(changed) != 0 {
statusChan <- changed
}
} else {
errChan <- err
}
<-timerChan
}
}()
return statusChan, errChan
}
type SubStateUpdate struct {
UnitName string
SubState string
}
// 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.
func (c *Conn) SetSubStateSubscriber(updateCh chan<- *SubStateUpdate, errCh chan<- error) {
c.subscriber.Lock()
defer c.subscriber.Unlock()
c.subscriber.updateCh = updateCh
c.subscriber.errCh = errCh
}
func (c *Conn) sendSubStateUpdate(path dbus.ObjectPath) {
c.subscriber.Lock()
defer c.subscriber.Unlock()
if c.shouldIgnore(path) {
return
}
info, err := c.GetUnitProperties(string(path))
if err != nil {
select {
case c.subscriber.errCh <- err:
default:
}
}
name := info["Id"].(string)
substate := info["SubState"].(string)
update := &SubStateUpdate{name, substate}
select {
case c.subscriber.updateCh <- update:
default:
select {
case c.subscriber.errCh <- errors.New("update channel full!"):
default:
}
}
c.updateIgnore(path, info)
}
// The ignore functions work around a wart in the systemd dbus interface.
// Requesting the properties of an unloaded unit will cause systemd to send a
// pair of UnitNew/UnitRemoved signals. Because we need to get a unit's
// properties on UnitNew (as that's the only indication of a new unit coming up
// for the first time), we would enter an infinite loop if we did not attempt
// to detect and ignore these spurious signals. The signal themselves are
// indistinguishable from relevant ones, so we (somewhat hackishly) ignore an
// unloaded unit's signals for a short time after requesting its properties.
// This means that we will miss e.g. a transient unit being restarted
// *immediately* upon failure and also a transient unit being started
// immediately after requesting its status (with systemctl status, for example,
// because this causes a UnitNew signal to be sent which then causes us to fetch
// the properties).
func (c *Conn) shouldIgnore(path dbus.ObjectPath) bool {
t, ok := c.subscriber.ignore[path]
return ok && t >= time.Now().UnixNano()
}
func (c *Conn) updateIgnore(path dbus.ObjectPath, info map[string]interface{}) {
c.cleanIgnore()
// unit is unloaded - it will trigger bad systemd dbus behavior
if info["LoadState"].(string) == "not-found" {
c.subscriber.ignore[path] = time.Now().UnixNano() + ignoreInterval
}
}
// without this, ignore would grow unboundedly over time
func (c *Conn) cleanIgnore() {
now := time.Now().UnixNano()
if c.subscriber.cleanIgnore < now {
c.subscriber.cleanIgnore = now + cleanIgnoreInterval
for p, t := range c.subscriber.ignore {
if t < now {
delete(c.subscriber.ignore, p)
}
}
}
}

57
vendor/github.com/coreos/go-systemd/dbus/subscription_set.go generated vendored Normal file
View File

@@ -0,0 +1,57 @@
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbus
import (
"time"
)
// SubscriptionSet returns a subscription set which is like conn.Subscribe but
// can filter to only return events for a set of units.
type SubscriptionSet struct {
*set
conn *Conn
}
func (s *SubscriptionSet) filter(unit string) bool {
return !s.Contains(unit)
}
// Subscribe starts listening for dbus events for all of the units in the set.
// Returns channels identical to conn.SubscribeUnits.
func (s *SubscriptionSet) Subscribe() (<-chan map[string]*UnitStatus, <-chan error) {
// TODO: Make fully evented by using systemd 209 with properties changed values
return s.conn.SubscribeUnitsCustom(time.Second, 0,
mismatchUnitStatus,
func(unit string) bool { return s.filter(unit) },
)
}
// NewSubscriptionSet returns a new subscription set.
func (conn *Conn) NewSubscriptionSet() *SubscriptionSet {
return &SubscriptionSet{newSet(), conn}
}
// mismatchUnitStatus returns true if the provided UnitStatus objects
// are not equivalent. false is returned if the objects are equivalent.
// Only the Name, Description and state-related fields are used in
// the comparison.
func mismatchUnitStatus(u1, u2 *UnitStatus) bool {
return u1.Name != u2.Name ||
u1.Description != u2.Description ||
u1.LoadState != u2.LoadState ||
u1.ActiveState != u2.ActiveState ||
u1.SubState != u2.SubState
}