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list.go
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list.go
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package container
import (
"context"
"io"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/command/formatter"
"github.com/docker/cli/opts"
"github.com/docker/cli/templates"
"github.com/docker/docker/api/types"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
type psOptions struct {
quiet bool
size bool
all bool
noTrunc bool
nLatest bool
last int
format string
filter opts.FilterOpt
}
// NewPsCommand creates a new cobra.Command for `docker ps`
func NewPsCommand(dockerCli command.Cli) *cobra.Command {
options := psOptions{filter: opts.NewFilterOpt()}
cmd := &cobra.Command{
Use: "ps [OPTIONS]",
Short: "List containers",
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
return runPs(dockerCli, &options)
},
}
flags := cmd.Flags()
flags.BoolVarP(&options.quiet, "quiet", "q", false, "Only display container IDs")
flags.BoolVarP(&options.size, "size", "s", false, "Display total file sizes")
flags.BoolVarP(&options.all, "all", "a", false, "Show all containers (default shows just running)")
flags.BoolVar(&options.noTrunc, "no-trunc", false, "Don't truncate output")
flags.BoolVarP(&options.nLatest, "latest", "l", false, "Show the latest created container (includes all states)")
flags.IntVarP(&options.last, "last", "n", -1, "Show n last created containers (includes all states)")
flags.StringVarP(&options.format, "format", "", "", "Pretty-print containers using a Go template")
flags.VarP(&options.filter, "filter", "f", "Filter output based on conditions provided")
return cmd
}
func newListCommand(dockerCli command.Cli) *cobra.Command {
cmd := *NewPsCommand(dockerCli)
cmd.Aliases = []string{"ps", "list"}
cmd.Use = "ls [OPTIONS]"
return &cmd
}
func buildContainerListOptions(opts *psOptions) (*types.ContainerListOptions, error) {
options := &types.ContainerListOptions{
All: opts.all,
Limit: opts.last,
Size: opts.size,
Filters: opts.filter.Value(),
}
if opts.nLatest && opts.last == -1 {
options.Limit = 1
}
options.Size = opts.size
if !options.Size && len(opts.format) > 0 {
// The --size option isn't set, but .Size may be used in the template.
// Parse and execute the given template to detect if the .Size field is
// used. If it is, then automatically enable the --size option. See #24696
//
// Only requesting container size information when needed is an optimization,
// because calculating the size is a costly operation.
tmpl, err := templates.NewParse("", opts.format)
if err != nil {
return nil, errors.Wrap(err, "failed to parse template")
}
optionsProcessor := formatter.NewContainerContext()
// This shouldn't error out but swallowing the error makes it harder
// to track down if preProcessor issues come up.
if err := tmpl.Execute(io.Discard, optionsProcessor); err != nil {
return nil, errors.Wrap(err, "failed to execute template")
}
if _, ok := optionsProcessor.FieldsUsed["Size"]; ok {
options.Size = true
}
}
return options, nil
}
func runPs(dockerCli command.Cli, options *psOptions) error {
ctx := context.Background()
listOptions, err := buildContainerListOptions(options)
if err != nil {
return err
}
containers, err := dockerCli.Client().ContainerList(ctx, *listOptions)
if err != nil {
return err
}
format := options.format
if len(format) == 0 {
if len(dockerCli.ConfigFile().PsFormat) > 0 && !options.quiet {
format = dockerCli.ConfigFile().PsFormat
} else {
format = formatter.TableFormatKey
}
}
containerCtx := formatter.Context{
Output: dockerCli.Out(),
Format: formatter.NewContainerFormat(format, options.quiet, listOptions.Size),
Trunc: !options.noTrunc,
}
return formatter.ContainerWrite(containerCtx, containers)
}