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moby--moby/daemon/execdriver/native/tmpfs.go

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package native
import (
"fmt"
"os"
"os/exec"
"strings"
"github.com/Sirupsen/logrus"
"github.com/opencontainers/runc/libcontainer/configs"
)
func genTmpfsPremountCmd(tmpDir string, fullDest string, dest string) []configs.Command {
var premount []configs.Command
tarPath, err := exec.LookPath("tar")
if err != nil {
logrus.Warn("tar command is not available for tmpfs mount: %s", err)
return premount
}
if _, err = exec.LookPath("rm"); err != nil {
logrus.Warn("rm command is not available for tmpfs mount: %s", err)
return premount
}
tarFile := fmt.Sprintf("%s/%s.tar", tmpDir, strings.Replace(dest, "/", "_", -1))
if _, err := os.Stat(fullDest); err == nil {
premount = append(premount, configs.Command{
Path: tarPath,
Args: []string{"-cf", tarFile, "-C", fullDest, "."},
})
}
return premount
}
func genTmpfsPostmountCmd(tmpDir string, fullDest string, dest string) []configs.Command {
var postmount []configs.Command
tarPath, err := exec.LookPath("tar")
if err != nil {
return postmount
}
rmPath, err := exec.LookPath("rm")
if err != nil {
return postmount
}
if _, err := os.Stat(fullDest); os.IsNotExist(err) {
return postmount
}
tarFile := fmt.Sprintf("%s/%s.tar", tmpDir, strings.Replace(dest, "/", "_", -1))
postmount = append(postmount, configs.Command{
Path: tarPath,
Args: []string{"-xf", tarFile, "-C", fullDest, "."},
})
return append(postmount, configs.Command{
Path: rmPath,
Args: []string{"-f", tarFile},
})
}