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69 lines (64 loc) · 1.75 KB
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package context
import (
"errors"
"fmt"
"io"
"os"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/context/store"
"github.com/spf13/cobra"
)
func newExportCommand(dockerCLI command.Cli) *cobra.Command {
return &cobra.Command{
Use: "export [OPTIONS] CONTEXT [FILE|-]",
Short: "Export a context to a tar archive FILE or a tar stream on STDOUT.",
Args: cli.RequiresRangeArgs(1, 2),
RunE: func(cmd *cobra.Command, args []string) error {
contextName := args[0]
var dest string
if len(args) == 2 {
dest = args[1]
} else {
dest = contextName + ".dockercontext"
}
return runExport(dockerCLI, contextName, dest)
},
ValidArgsFunction: completeContextNames(dockerCLI, 1, true),
DisableFlagsInUseLine: true,
}
}
func writeTo(dockerCli command.Cli, reader io.Reader, dest string) error {
var writer io.Writer
var printDest bool
if dest == "-" {
if dockerCli.Out().IsTerminal() {
return errors.New("cowardly refusing to export to a terminal, specify a file path")
}
writer = dockerCli.Out()
} else {
f, err := os.OpenFile(dest, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o600)
if err != nil {
return err
}
defer f.Close()
writer = f
printDest = true
}
if _, err := io.Copy(writer, reader); err != nil {
return err
}
if printDest {
fmt.Fprintf(dockerCli.Err(), "Written file %q\n", dest)
}
return nil
}
// runExport exports a Docker context.
func runExport(dockerCLI command.Cli, contextName string, dest string) error {
if err := store.ValidateContextName(contextName); err != nil && contextName != command.DefaultContextName {
return err
}
reader := store.Export(contextName, dockerCLI.ContextStore())
defer reader.Close()
return writeTo(dockerCLI, reader, dest)
}