71b21cf347
It will Tar up contents of child directory onto tmpfs if mounted over This patch will use the new PreMount and PostMount hooks to "tar" up the contents of the base image on top of tmpfs mount points. Signed-off-by: Dan Walsh <dwalsh@redhat.com> Upstream-commit: b3e527dfd242ad30c0297c8b257862116cf2c50e Component: engine
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
package native
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import (
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"fmt"
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"os"
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"os/exec"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/opencontainers/runc/libcontainer/configs"
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)
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func genTmpfsPremountCmd(tmpDir string, fullDest string, dest string) []configs.Command {
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var premount []configs.Command
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tarPath, err := exec.LookPath("tar")
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if err != nil {
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logrus.Warn("tar command is not available for tmpfs mount: %s", err)
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return premount
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}
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if _, err = exec.LookPath("rm"); err != nil {
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logrus.Warn("rm command is not available for tmpfs mount: %s", err)
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return premount
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}
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tarFile := fmt.Sprintf("%s/%s.tar", tmpDir, strings.Replace(dest, "/", "_", -1))
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if _, err := os.Stat(fullDest); err == nil {
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premount = append(premount, configs.Command{
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Path: tarPath,
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Args: []string{"-cf", tarFile, "-C", fullDest, "."},
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})
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}
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return premount
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}
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func genTmpfsPostmountCmd(tmpDir string, fullDest string, dest string) []configs.Command {
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var postmount []configs.Command
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tarPath, err := exec.LookPath("tar")
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if err != nil {
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return postmount
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}
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rmPath, err := exec.LookPath("rm")
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if err != nil {
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return postmount
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}
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if _, err := os.Stat(fullDest); os.IsNotExist(err) {
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return postmount
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}
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tarFile := fmt.Sprintf("%s/%s.tar", tmpDir, strings.Replace(dest, "/", "_", -1))
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postmount = append(postmount, configs.Command{
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Path: tarPath,
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Args: []string{"-xf", tarFile, "-C", fullDest, "."},
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})
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return append(postmount, configs.Command{
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Path: rmPath,
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Args: []string{"-f", tarFile},
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})
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}
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