mirror of https://github.com/docker/cli.git
75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
package context
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import (
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"errors"
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"fmt"
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"io"
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"os"
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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/context/store"
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"github.com/spf13/cobra"
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)
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// ExportOptions are the options used for exporting a context
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type ExportOptions struct {
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ContextName string
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Dest string
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}
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func newExportCommand(dockerCli command.Cli) *cobra.Command {
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return &cobra.Command{
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Use: "export [OPTIONS] CONTEXT [FILE|-]",
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Short: "Export a context to a tar archive FILE or a tar stream on STDOUT.",
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Args: cli.RequiresRangeArgs(1, 2),
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RunE: func(cmd *cobra.Command, args []string) error {
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opts := &ExportOptions{
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ContextName: args[0],
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}
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if len(args) == 2 {
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opts.Dest = args[1]
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} else {
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opts.Dest = opts.ContextName + ".dockercontext"
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}
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return RunExport(dockerCli, opts)
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},
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}
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}
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func writeTo(dockerCli command.Cli, reader io.Reader, dest string) error {
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var writer io.Writer
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var printDest bool
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if dest == "-" {
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if dockerCli.Out().IsTerminal() {
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return errors.New("cowardly refusing to export to a terminal, specify a file path")
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}
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writer = dockerCli.Out()
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} else {
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f, err := os.OpenFile(dest, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o600)
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if err != nil {
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return err
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}
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defer f.Close()
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writer = f
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printDest = true
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}
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if _, err := io.Copy(writer, reader); err != nil {
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return err
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}
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if printDest {
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fmt.Fprintf(dockerCli.Err(), "Written file %q\n", dest)
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}
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return nil
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}
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// RunExport exports a Docker context
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func RunExport(dockerCli command.Cli, opts *ExportOptions) error {
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if err := store.ValidateContextName(opts.ContextName); err != nil && opts.ContextName != command.DefaultContextName {
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return err
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}
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reader := store.Export(opts.ContextName, dockerCli.ContextStore())
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defer reader.Close()
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return writeTo(dockerCli, reader, opts.Dest)
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}
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