docker/swarmkit

package flagparser

import (
    "fmt"
    "strings"

    "github.com/moby/swarmkit/v2/api"
    "github.com/spf13/pflag"
)

// parseVolume only supports a very simple version of anonymous volumes for
// testing the most basic of data flows. Replace with a --mount flag, similar
// to what we have in docker service.
func parseVolume(flags *pflag.FlagSet, spec *api.ServiceSpec) error {
    if flags.Changed("volume") {
        volumes, err := flags.GetStringSlice("volume")
        if err != nil {
            return err
        }

        container := spec.Task.GetContainer()

        for _, volume := range volumes {
            if strings.Contains(volume, ":") {
                return fmt.Errorf("volume format %q not supported", volume)
            }
            container.Mounts = append(container.Mounts, api.Mount{
                Type:   api.MountTypeVolume,
                Target: volume,
            })
        }
    }

    return nil
}