github.com/portworx/docker@v1.12.1/api/client/swarm/update.go (about)

     1  package swarm
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"golang.org/x/net/context"
     7  
     8  	"github.com/docker/docker/api/client"
     9  	"github.com/docker/docker/cli"
    10  	"github.com/docker/engine-api/types/swarm"
    11  	"github.com/spf13/cobra"
    12  	"github.com/spf13/pflag"
    13  )
    14  
    15  func newUpdateCommand(dockerCli *client.DockerCli) *cobra.Command {
    16  	opts := swarmOptions{}
    17  
    18  	cmd := &cobra.Command{
    19  		Use:   "update [OPTIONS]",
    20  		Short: "Update the swarm",
    21  		Args:  cli.NoArgs,
    22  		RunE: func(cmd *cobra.Command, args []string) error {
    23  			return runUpdate(dockerCli, cmd.Flags(), opts)
    24  		},
    25  	}
    26  
    27  	addSwarmFlags(cmd.Flags(), &opts)
    28  	return cmd
    29  }
    30  
    31  func runUpdate(dockerCli *client.DockerCli, flags *pflag.FlagSet, opts swarmOptions) error {
    32  	client := dockerCli.Client()
    33  	ctx := context.Background()
    34  
    35  	var updateFlags swarm.UpdateFlags
    36  
    37  	swarm, err := client.SwarmInspect(ctx)
    38  	if err != nil {
    39  		return err
    40  	}
    41  
    42  	err = mergeSwarm(&swarm, flags)
    43  	if err != nil {
    44  		return err
    45  	}
    46  
    47  	err = client.SwarmUpdate(ctx, swarm.Version, swarm.Spec, updateFlags)
    48  	if err != nil {
    49  		return err
    50  	}
    51  
    52  	fmt.Fprintln(dockerCli.Out(), "Swarm updated.")
    53  
    54  	return nil
    55  }
    56  
    57  func mergeSwarm(swarm *swarm.Swarm, flags *pflag.FlagSet) error {
    58  	spec := &swarm.Spec
    59  
    60  	if flags.Changed(flagTaskHistoryLimit) {
    61  		spec.Orchestration.TaskHistoryRetentionLimit, _ = flags.GetInt64(flagTaskHistoryLimit)
    62  	}
    63  
    64  	if flags.Changed(flagDispatcherHeartbeat) {
    65  		if v, err := flags.GetDuration(flagDispatcherHeartbeat); err == nil {
    66  			spec.Dispatcher.HeartbeatPeriod = uint64(v.Nanoseconds())
    67  		}
    68  	}
    69  
    70  	if flags.Changed(flagCertExpiry) {
    71  		if v, err := flags.GetDuration(flagCertExpiry); err == nil {
    72  			spec.CAConfig.NodeCertExpiry = v
    73  		}
    74  	}
    75  
    76  	if flags.Changed(flagExternalCA) {
    77  		value := flags.Lookup(flagExternalCA).Value.(*ExternalCAOption)
    78  		spec.CAConfig.ExternalCAs = value.Value()
    79  	}
    80  
    81  	return nil
    82  }