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package main
import (
"os"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/pkg/adapter"
"github.com/containers/libpod/pkg/rootless"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
var (
exportCommand cliconfig.ExportValues
exportDescription = "Exports container's filesystem contents as a tar archive" +
" and saves it on the local machine."
_exportCommand = &cobra.Command{
Use: "export [flags] CONTAINER",
Short: "Export container's filesystem contents as a tar archive",
Long: exportDescription,
RunE: func(cmd *cobra.Command, args []string) error {
exportCommand.InputArgs = args
exportCommand.GlobalFlags = MainGlobalOpts
return exportCmd(&exportCommand)
},
Example: `podman export ctrID > myCtr.tar
podman export --output="myCtr.tar" ctrID`,
}
)
func init() {
exportCommand.Command = _exportCommand
exportCommand.SetUsageTemplate(UsageTemplate())
flags := exportCommand.Flags()
flags.StringVarP(&exportCommand.Output, "output", "o", "/dev/stdout", "Write to a file, default is STDOUT")
}
// exportCmd saves a container to a tarball on disk
func exportCmd(c *cliconfig.ExportValues) error {
if os.Geteuid() != 0 {
rootless.SetSkipStorageSetup(true)
}
runtime, err := adapter.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.InputArgs
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.Output
if runtime.Remote && (output == "/dev/stdout" || len(output) == 0) {
return errors.New("remote client usage must specify an output file (-o)")
}
if output == "/dev/stdout" {
file := os.Stdout
if logrus.IsTerminal(file) {
return errors.Errorf("refusing to export to terminal. Use -o flag or redirect")
}
}
if err := validateFileName(output); err != nil {
return err
}
return runtime.Export(args[0], output)
}
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