// NewLock creates a gate.Lock to be used to synchronise workers which
// need to start after upgrades have completed. If no upgrade steps
// are required the Lock is unlocked and the version in agent's
// configuration is updated to the currently running version.
//
// The returned Lock should be passed to NewWorker.
func NewLock(a agent.Agent) (gate.Lock, error) {
lock := gate.NewLock()
if wrench.IsActive("machine-agent", "always-try-upgrade") {
// Always enter upgrade mode. This allows test of upgrades
// even when there's actually no upgrade steps to run.
return lock, nil
}
err := a.ChangeConfig(func(agentConfig agent.ConfigSetter) error {
if !upgrades.AreUpgradesDefined(agentConfig.UpgradedToVersion()) {
logger.Infof("no upgrade steps required or upgrade steps for %v "+
"have already been run.", jujuversion.Current)
lock.Unlock()
// Even if no upgrade is required the version number in
// the agent's config still needs to be bumped.
agentConfig.SetUpgradedToVersion(jujuversion.Current)
}
return nil
})
if err != nil {
return nil, err
}
return lock, nil
}
// InitialiseUsingAgent sets up a upgradeWorkerContext from a machine agent instance.
// It may update the agent's configuration.
func (c *upgradeWorkerContext) InitializeUsingAgent(a upgradingMachineAgent) error {
return a.ChangeConfig(func(agentConfig agent.ConfigSetter) error {
if !upgrades.AreUpgradesDefined(agentConfig.UpgradedToVersion()) {
logger.Infof("no upgrade steps required or upgrade steps for %v "+
"have already been run.", version.Current.Number)
close(c.UpgradeComplete)
// Even if no upgrade is required the version number in
// the agent's config still needs to be bumped.
agentConfig.SetUpgradedToVersion(version.Current.Number)
}
return nil
})
}
func (s *upgradeSuite) TestAreUpgradesDefined(c *gc.C) {
s.PatchValue(upgrades.StateUpgradeOperations, stateUpgradeOperations)
s.PatchValue(upgrades.UpgradeOperations, upgradeOperations)
for i, test := range areUpgradesDefinedTests {
c.Logf("%d: %s", i, test.about)
fromVersion := version.Zero
if test.fromVersion != "" {
fromVersion = version.MustParse(test.fromVersion)
}
toVersion := version.MustParse("1.18.0")
if test.toVersion != "" {
toVersion = version.MustParse(test.toVersion)
}
s.PatchValue(&jujuversion.Current, toVersion)
result := upgrades.AreUpgradesDefined(fromVersion)
c.Check(result, gc.Equals, test.expected)
}
}
// InitialiseUsingAgent sets up a upgradeWorkerContext from a machine agent instance.
// It may update the agent's configuration.
func (c *upgradeWorkerContext) InitializeUsingAgent(a upgradingMachineAgent) error {
if wrench.IsActive("machine-agent", "always-try-upgrade") {
// Always enter upgrade mode. This allows test of upgrades
// even when there's actually no upgrade steps to run.
return nil
}
return a.ChangeConfig(func(agentConfig agent.ConfigSetter) error {
if !upgrades.AreUpgradesDefined(agentConfig.UpgradedToVersion()) {
logger.Infof("no upgrade steps required or upgrade steps for %v "+
"have already been run.", version.Current.Number)
close(c.UpgradeComplete)
// Even if no upgrade is required the version number in
// the agent's config still needs to be bumped.
agentConfig.SetUpgradedToVersion(version.Current.Number)
}
return nil
})
}