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package chrootarchive // import "github.com/docker/docker/pkg/chrootarchive"
import (
"github.com/docker/docker/internal/mounttree"
"github.com/docker/docker/internal/unshare"
"github.com/moby/sys/mount"
"golang.org/x/sys/unix"
)
// goInChroot starts fn in a goroutine where the root directory, current working
// directory and umask are unshared from other goroutines and the root directory
// has been changed to path. These changes are only visible to the goroutine in
// which fn is executed. Any other goroutines, including ones started from fn,
// will see the same root directory and file system attributes as the rest of
// the process.
func goInChroot(path string, fn func()) error {
return unshare.Go(
unix.CLONE_FS|unix.CLONE_NEWNS,
func() error {
// Make everything in new ns slave.
// Don't use `private` here as this could race where the mountns gets a
// reference to a mount and an unmount from the host does not propagate,
// which could potentially cause transient errors for other operations,
// even though this should be relatively small window here `slave` should
// not cause any problems.
if err := mount.MakeRSlave("/"); err != nil {
return err
}
return mounttree.SwitchRoot(path)
},
fn,
)
}
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