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package volumes
import (
"context"
"fmt"
"github.com/containers/common/pkg/completion"
"github.com/containers/podman/v4/cmd/podman/common"
"github.com/containers/podman/v4/cmd/podman/registry"
"github.com/containers/podman/v4/pkg/domain/entities"
"github.com/containers/podman/v4/utils"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
var (
volumeExportDescription = `
podman volume export
Allow content of volume to be exported into external tar.`
exportCommand = &cobra.Command{
Annotations: map[string]string{registry.EngineMode: registry.ABIMode},
Use: "export [options] VOLUME",
Short: "Export volumes",
Args: cobra.ExactArgs(1),
Long: volumeExportDescription,
RunE: export,
ValidArgsFunction: common.AutocompleteVolumes,
}
)
var (
// Temporary struct to hold cli values.
cliExportOpts = struct {
Output string
}{}
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Command: exportCommand,
Parent: volumeCmd,
})
flags := exportCommand.Flags()
outputFlagName := "output"
flags.StringVarP(&cliExportOpts.Output, outputFlagName, "o", "/dev/stdout", "Write to a specified file (default: stdout, which must be redirected)")
_ = exportCommand.RegisterFlagCompletionFunc(outputFlagName, completion.AutocompleteDefault)
}
func export(cmd *cobra.Command, args []string) error {
var inspectOpts entities.InspectOptions
containerEngine := registry.ContainerEngine()
ctx := context.Background()
if cliExportOpts.Output == "" {
return errors.New("expects output path, use --output=[path]")
}
inspectOpts.Type = common.VolumeType
volumeData, _, err := containerEngine.VolumeInspect(ctx, args, inspectOpts)
if err != nil {
return err
}
if len(volumeData) < 1 {
return errors.New("no volume data found")
}
mountPoint := volumeData[0].VolumeConfigResponse.Mountpoint
driver := volumeData[0].VolumeConfigResponse.Driver
volumeOptions := volumeData[0].VolumeConfigResponse.Options
volumeMountStatus, err := containerEngine.VolumeMounted(ctx, args[0])
if err != nil {
return err
}
if mountPoint == "" {
return errors.New("volume is not mounted anywhere on host")
}
// Check if volume is using external plugin and export only if volume is mounted
if driver != "" && driver != "local" {
if !volumeMountStatus.Value {
return fmt.Errorf("volume is using a driver %s and volume is not mounted on %s", driver, mountPoint)
}
}
// Check if volume is using `local` driver and has mount options type other than tmpfs
if driver == "local" {
if mountOptionType, ok := volumeOptions["type"]; ok {
if mountOptionType != "tmpfs" && !volumeMountStatus.Value {
return fmt.Errorf("volume is using a driver %s and volume is not mounted on %s", driver, mountPoint)
}
}
}
logrus.Debugf("Exporting volume data from %s to %s", mountPoint, cliExportOpts.Output)
err = utils.CreateTarFromSrc(mountPoint, cliExportOpts.Output)
return err
}
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