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package snapshot
import (
"os"
"github.com/containerd/containerd/mount"
"github.com/pkg/errors"
)
func (lm *localMounter) Mount() (string, error) {
lm.mu.Lock()
defer lm.mu.Unlock()
if lm.mounts == nil && lm.mountable != nil {
mounts, release, err := lm.mountable.Mount()
if err != nil {
return "", err
}
lm.mounts = mounts
lm.release = release
}
if !lm.forceRemount && len(lm.mounts) == 1 && lm.mounts[0].Type == "nullfs" {
ro := false
for _, opt := range lm.mounts[0].Options {
if opt == "ro" {
ro = true
break
}
}
if !ro {
return lm.mounts[0].Source, nil
}
}
dir, err := os.MkdirTemp("", "buildkit-mount")
if err != nil {
return "", errors.Wrap(err, "failed to create temp dir")
}
if err := mount.All(lm.mounts, dir); err != nil {
os.RemoveAll(dir)
return "", errors.Wrapf(err, "failed to mount %s: %+v", dir, lm.mounts)
}
lm.target = dir
return dir, nil
}
func (lm *localMounter) Unmount() error {
lm.mu.Lock()
defer lm.mu.Unlock()
if lm.target != "" {
if err := mount.Unmount(lm.target, 0); err != nil {
return err
}
os.RemoveAll(lm.target)
lm.target = ""
}
if lm.release != nil {
return lm.release()
}
return nil
}
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