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service update: Don't assume existing pointers in spec are valid

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When updating values in the spec according to CLI flags, don't write
into the existing pointers. They may be nil. Instead, update them to
point to the new value we're writing.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2016-07-25 23:53:20 -07:00
parent 4144e11d32
commit f9c920a126
1 changed files with 14 additions and 11 deletions
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25
api/client/service/update.go
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@ -98,7 +98,6 @@ func runUpdate(dockerCli *client.DockerCli, flags *pflag.FlagSet, serviceID stri
} }
func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error { func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
updateString := func(flag string, field *string) { updateString := func(flag string, field *string) {
if flags.Changed(flag) { if flags.Changed(flag) {
*field, _ = flags.GetString(flag) *field, _ = flags.GetString(flag)
@ -117,9 +116,10 @@ func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
} }
} }
updateDurationOpt := func(flag string, field *time.Duration) { updateDurationOpt := func(flag string, field **time.Duration) {
if flags.Changed(flag) { if flags.Changed(flag) {
*field = *flags.Lookup(flag).Value.(*DurationOpt).Value() val := *flags.Lookup(flag).Value.(*DurationOpt).Value()
*field = &val
} }
} }
@ -129,9 +129,10 @@ func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
} }
} }
updateUint64Opt := func(flag string, field *uint64) { updateUint64Opt := func(flag string, field **uint64) {
if flags.Changed(flag) { if flags.Changed(flag) {
*field = *flags.Lookup(flag).Value.(*Uint64Opt).Value() val := *flags.Lookup(flag).Value.(*Uint64Opt).Value()
*field = &val
} }
} }
@ -159,7 +160,6 @@ func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
taskResources().Limits = &swarm.Resources{} taskResources().Limits = &swarm.Resources{}
updateInt64Value(flagLimitCPU, &task.Resources.Limits.NanoCPUs) updateInt64Value(flagLimitCPU, &task.Resources.Limits.NanoCPUs)
updateInt64Value(flagLimitMemory, &task.Resources.Limits.MemoryBytes) updateInt64Value(flagLimitMemory, &task.Resources.Limits.MemoryBytes)
} }
if flags.Changed(flagReserveCPU) || flags.Changed(flagReserveMemory) { if flags.Changed(flagReserveCPU) || flags.Changed(flagReserveMemory) {
taskResources().Reservations = &swarm.Resources{} taskResources().Reservations = &swarm.Resources{}
@ -167,7 +167,7 @@ func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
updateInt64Value(flagReserveMemory, &task.Resources.Reservations.MemoryBytes) updateInt64Value(flagReserveMemory, &task.Resources.Reservations.MemoryBytes)
} }
updateDurationOpt(flagStopGracePeriod, cspec.StopGracePeriod) updateDurationOpt(flagStopGracePeriod, &cspec.StopGracePeriod)
if anyChanged(flags, flagRestartCondition, flagRestartDelay, flagRestartMaxAttempts, flagRestartWindow) { if anyChanged(flags, flagRestartCondition, flagRestartDelay, flagRestartMaxAttempts, flagRestartWindow) {
if task.RestartPolicy == nil { if task.RestartPolicy == nil {
@ -178,9 +178,9 @@ func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
value, _ := flags.GetString(flagRestartCondition) value, _ := flags.GetString(flagRestartCondition)
task.RestartPolicy.Condition = swarm.RestartPolicyCondition(value) task.RestartPolicy.Condition = swarm.RestartPolicyCondition(value)
} }
updateDurationOpt(flagRestartDelay, task.RestartPolicy.Delay) updateDurationOpt(flagRestartDelay, &task.RestartPolicy.Delay)
updateUint64Opt(flagRestartMaxAttempts, task.RestartPolicy.MaxAttempts) updateUint64Opt(flagRestartMaxAttempts, &task.RestartPolicy.MaxAttempts)
updateDurationOpt((flagRestartWindow), task.RestartPolicy.Window) updateDurationOpt(flagRestartWindow, &task.RestartPolicy.Window)
} }
if anyChanged(flags, flagConstraintAdd, flagConstraintRemove) { if anyChanged(flags, flagConstraintAdd, flagConstraintRemove) {
@ -206,6 +206,9 @@ func updateService(flags *pflag.FlagSet, spec *swarm.ServiceSpec) error {
updateNetworks(flags, &spec.Networks) updateNetworks(flags, &spec.Networks)
if flags.Changed(flagEndpointMode) { if flags.Changed(flagEndpointMode) {
value, _ := flags.GetString(flagEndpointMode) value, _ := flags.GetString(flagEndpointMode)
if spec.EndpointSpec == nil {
spec.EndpointSpec = &swarm.EndpointSpec{}
}
spec.EndpointSpec.Mode = swarm.ResolutionMode(value) spec.EndpointSpec.Mode = swarm.ResolutionMode(value)
} }
@ -409,7 +412,7 @@ func updateReplicas(flags *pflag.FlagSet, serviceMode *swarm.ServiceMode) error
return nil return nil
} }
if serviceMode.Replicated == nil { if serviceMode == nil || serviceMode.Replicated == nil {
return fmt.Errorf("replicas can only be used with replicated mode") return fmt.Errorf("replicas can only be used with replicated mode")
} }
serviceMode.Replicated.Replicas = flags.Lookup(flagReplicas).Value.(*Uint64Opt).Value() serviceMode.Replicated.Replicas = flags.Lookup(flagReplicas).Value.(*Uint64Opt).Value()