53 lines
1.0 KiB
Go
53 lines
1.0 KiB
Go
package docker
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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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)
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type Filesystem struct {
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RootFS string
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RWPath string
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Layers []string
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}
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func (fs *Filesystem) createMountPoints() error {
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if err := os.Mkdir(fs.RootFS, 0700); err != nil && !os.IsExist(err) {
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return err
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}
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if err := os.Mkdir(fs.RWPath, 0700); err != nil && !os.IsExist(err) {
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return err
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}
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return nil
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}
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func (fs *Filesystem) Mount() error {
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if err := fs.createMountPoints(); err != nil {
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return err
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}
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rwBranch := fmt.Sprintf("%v=rw", fs.RWPath)
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roBranches := ""
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for _, layer := range fs.Layers {
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roBranches += fmt.Sprintf("%v=ro:", layer)
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}
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branches := fmt.Sprintf("br:%v:%v", rwBranch, roBranches)
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cmd := exec.Command("mount", "-t", "aufs", "-o", branches, "none", fs.RootFS)
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if err := cmd.Run(); err != nil {
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return err
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}
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return nil
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}
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func (fs *Filesystem) Umount() error {
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return exec.Command("umount", fs.RootFS).Run()
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}
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func newFilesystem(rootfs string, rwpath string, layers []string) *Filesystem {
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return &Filesystem{
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RootFS: rootfs,
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RWPath: rwpath,
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Layers: layers,
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}
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}
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