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Merge pull request #40 from bcwaldon/unit-command

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Implement unit.command
This commit is contained in:
Brian Waldon 2014-03-19 16:06:01 -07:00
commit b89ddae983
4 changed files with 85 additions and 85 deletions
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26
Documentation/cloud-config.md
View File

@ -46,9 +46,16 @@ Note that hyphens in the coreos.etcd.* keys are mapped to underscores.
Arbitrary systemd units may be provided in the `coreos.units` attribute.
`coreos.units` is a list of objects with the following fields:
- **name**: string representing unit's name
- **runtime**: boolean indicating whether or not to persist the unit across reboots. This is analagous to the `--runtime` flag to `systemd enable`.
- **content**: plaintext string representing entire unit file
- **name**: String representing unit's name. Required.
- **runtime**: Boolean indicating whether or not to persist the unit across reboots. This is analagous to the `--runtime` argument to `systemd enable`. Default value is false.
- **content**: Plaintext string representing entire unit file. If no value is provided, the unit is assumed to exist already.
- **command**: Command to execute on unit: start, stop, reload, restart, try-restart, reload-or-restart, reload-or-try-restart. Default value is restart.
**NOTE:** The command field is ignored for all network, netdev, and link units. The systemd-networkd.service unit will be restarted in their place.
##### Examples
Write a unit to disk, automatically starting it.
```
#cloud-config
@ -71,6 +78,19 @@ coreos:
WantedBy=local.target
```
Start the builtin `etcd` and `fleet` services:
```
# cloud-config
coreos:
units:
- name: etcd.service
command: start
- name: fleet.service
command: start
## Cloud-Config Parameters
### ssh_authorized_keys

63
initialize/config.go
View File

@ -14,7 +14,6 @@ type CloudConfig struct {
SSHAuthorizedKeys []string `yaml:"ssh_authorized_keys"`
Coreos struct {
Etcd EtcdEnvironment
Fleet struct{ Autostart bool }
Units []system.Unit
}
WriteFiles []system.File `yaml:"write_files"`
@ -115,34 +114,48 @@ func Apply(cfg CloudConfig, env *Environment) error {
}
if len(cfg.Coreos.Units) > 0 {
commands := make(map[string]string, 0)
for _, unit := range cfg.Coreos.Units {
log.Printf("Placing unit %s on filesystem", unit.Name)
dst, err := system.PlaceUnit(&unit, env.Root())
if unit.Content != "" {
log.Printf("Writing unit %s to filesystem", unit.Name)
dst, err := system.PlaceUnit(&unit, env.Root())
if err != nil {
return err
}
log.Printf("Placed unit %s at %s", unit.Name, dst)
if unit.Group() != "network" {
log.Printf("Enabling unit file %s", dst)
if err := system.EnableUnitFile(dst, unit.Runtime); err != nil {
return err
}
log.Printf("Enabled unit %s", unit.Name)
} else {
log.Printf("Skipping enable for network-like unit %s", unit.Name)
}
}
if unit.Group() != "network" {
command := unit.Command
if command == "" {
command = "restart"
}
commands[unit.Name] = command
} else {
commands["systemd-networkd.service"] = "restart"
}
}
system.DaemonReload()
for unit, command := range commands {
log.Printf("Calling unit command '%s %s'", command, unit)
res, err := system.RunUnitCommand(command, unit)
if err != nil {
return err
}
log.Printf("Placed unit %s at %s", unit.Name, dst)
if unit.Group() != "network" {
log.Printf("Enabling unit file %s", dst)
if err := system.EnableUnitFile(dst, unit.Runtime); err != nil {
return err
}
log.Printf("Enabled unit %s", unit.Name)
} else {
log.Printf("Skipping enable for network-like unit %s", unit.Name)
}
}
system.DaemonReload()
system.StartUnits(cfg.Coreos.Units)
}
if cfg.Coreos.Fleet.Autostart {
err := system.StartUnitByName("fleet.service")
if err == nil {
log.Printf("Started fleet service.")
} else {
return err
log.Printf("Result of '%s %s': %s", command, unit, res)
}
}

10
initialize/config_test.go
View File

@ -17,10 +17,6 @@ func TestCloudConfigEmpty(t *testing.T) {
t.Error("Parsed incorrect number of SSH keys")
}
if cfg.Coreos.Fleet.Autostart {
t.Error("Expected AutostartFleet not to be defined")
}
if len(cfg.WriteFiles) != 0 {
t.Error("Expected zero WriteFiles")
}
@ -36,8 +32,6 @@ func TestCloudConfig(t *testing.T) {
coreos:
etcd:
discovery: "https://discovery.etcd.io/827c73219eeb2fa5530027c37bf18877"
fleet:
autostart: Yes
units:
- name: 50-eth0.network
runtime: yes
@ -77,10 +71,6 @@ hostname: trontastic
t.Error("Expected first SSH key to be 'foobaz'")
}
if !cfg.Coreos.Fleet.Autostart {
t.Error("Expected AutostartFleet to be true")
}
if len(cfg.WriteFiles) != 1 {
t.Error("Failed to parse correct number of write_files")
} else {

71
system/systemd.go
View File

@ -21,6 +21,7 @@ type Unit struct {
Name string
Runtime bool
Content string
Command string
}
func (u *Unit) Type() string {
@ -80,34 +81,33 @@ func EnableUnitFile(file string, runtime bool) error {
return err
}
func separateNetworkUnits(units []Unit) ([]Unit, []Unit) {
networkUnits := make([]Unit, 0)
nonNetworkUnits := make([]Unit, 0)
for _, unit := range units {
if unit.Group() == "network" {
networkUnits = append(networkUnits, unit)
} else {
nonNetworkUnits = append(nonNetworkUnits, unit)
}
}
return networkUnits, nonNetworkUnits
}
func StartUnits(units []Unit) error {
networkUnits, nonNetworkUnits := separateNetworkUnits(units)
if len(networkUnits) > 0 {
if err := RestartUnitByName("systemd-networkd.service"); err != nil {
return err
}
func RunUnitCommand(command, unit string) (string, error) {
conn, err := dbus.New()
if err != nil {
return "", err
}
for _, unit := range nonNetworkUnits {
if err := RestartUnitByName(unit.Name); err != nil {
return err
}
var fn func(string, string) (string, error)
switch command {
case "start":
fn = conn.StartUnit
case "stop":
fn = conn.StopUnit
case "restart":
fn = conn.RestartUnit
case "reload":
fn = conn.ReloadUnit
case "try-restart":
fn = conn.TryRestartUnit
case "reload-or-restart":
fn = conn.ReloadOrRestartUnit
case "reload-or-try-restart":
fn = conn.ReloadOrTryRestartUnit
default:
return "", fmt.Errorf("Unsupported systemd command %q", command)
}
return nil
return fn(unit, "replace")
}
func DaemonReload() error {
@ -120,29 +120,6 @@ func DaemonReload() error {
return err
}
func RestartUnitByName(name string) error {
log.Printf("Restarting unit %s", name)
conn, err := dbus.New()
if err != nil {
return err
}
output, err := conn.RestartUnit(name, "replace")
log.Printf("Restart completed with '%s'", output)
return err
}
func StartUnitByName(name string) error {
conn, err := dbus.New()
if err != nil {
return err
}
_, err = conn.StartUnit(name, "replace")
return err
}
func ExecuteScript(scriptPath string) (string, error) {
props := []dbus.Property{
dbus.PropDescription("Unit generated and executed by coreos-cloudinit on behalf of user"),