b8bcf6f5ad
Same functionality, but implemented with atomicwriter. There's a slight
difference in error-messages produced (but can be adjusted if we want).
Before:
docker container export -o ./no/such/foo mycontainer
failed to export container: invalid output path: directory "no/such" does not exist
docker container export -o /no/permissions mycontainer
failed to export container: stat /no/permissions: permission denied
After:
docker container export -o ./no/such/foo mycontainer
failed to export container: invalid file path: stat no/such: no such file or directory
docker container export -o /no/permissions mycontainer
failed to export container: failed to stat output path: lstat /no/permissions: permission denied
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package container
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import (
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"context"
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"io"
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"github.com/docker/cli/cli"
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"github.com/docker/cli/cli/command"
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"github.com/docker/cli/cli/command/completion"
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"github.com/moby/sys/atomicwriter"
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"github.com/pkg/errors"
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"github.com/spf13/cobra"
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)
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type exportOptions struct {
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container string
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output string
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}
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// NewExportCommand creates a new `docker export` command
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func NewExportCommand(dockerCli command.Cli) *cobra.Command {
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var opts exportOptions
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cmd := &cobra.Command{
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Use: "export [OPTIONS] CONTAINER",
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Short: "Export a container's filesystem as a tar archive",
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Args: cli.ExactArgs(1),
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RunE: func(cmd *cobra.Command, args []string) error {
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opts.container = args[0]
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return runExport(cmd.Context(), dockerCli, opts)
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},
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Annotations: map[string]string{
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"aliases": "docker container export, docker export",
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},
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ValidArgsFunction: completion.ContainerNames(dockerCli, true),
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}
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flags := cmd.Flags()
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flags.StringVarP(&opts.output, "output", "o", "", "Write to a file, instead of STDOUT")
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return cmd
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}
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func runExport(ctx context.Context, dockerCLI command.Cli, opts exportOptions) error {
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var output io.Writer
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if opts.output == "" {
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if dockerCLI.Out().IsTerminal() {
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return errors.New("cowardly refusing to save to a terminal. Use the -o flag or redirect")
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}
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output = dockerCLI.Out()
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} else {
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writer, err := atomicwriter.New(opts.output, 0o600)
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if err != nil {
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return errors.Wrap(err, "failed to export container")
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}
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defer writer.Close()
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output = writer
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}
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responseBody, err := dockerCLI.Client().ContainerExport(ctx, opts.container)
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if err != nil {
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return err
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}
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defer responseBody.Close()
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_, err = io.Copy(output, responseBody)
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return err
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}
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