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package main
import (
"os"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var (
exportFlags = []cli.Flag{
cli.StringFlag{
Name: "output, o",
Usage: "Write to a file, default is STDOUT",
Value: "/dev/stdout",
},
}
exportDescription = "Exports container's filesystem contents as a tar archive" +
" and saves it on the local machine."
exportCommand = cli.Command{
Name: "export",
Usage: "Export container's filesystem contents as a tar archive",
Description: exportDescription,
Flags: exportFlags,
Action: exportCmd,
ArgsUsage: "CONTAINER",
}
)
// exportCmd saves a container to a tarball on disk
func exportCmd(c *cli.Context) error {
if err := validateFlags(c, exportFlags); err != nil {
return err
}
runtime, err := getRuntime(c)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.Args()
if len(args) == 0 {
return errors.Errorf("container id must be specified")
}
if len(args) > 1 {
return errors.Errorf("too many arguments given, need 1 at most.")
}
output := c.String("output")
if output == "/dev/stdout" {
file := os.Stdout
if logrus.IsTerminal(file) {
return errors.Errorf("refusing to export to terminal. Use -o flag or redirect")
}
}
ctr, err := runtime.LookupContainer(args[0])
if err != nil {
return errors.Wrapf(err, "error looking up container %q", args[0])
}
return ctr.Export(output)
}
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