github.com/sams1990/dockerrepo@v17.12.1-ce-rc2+incompatible/daemon/volumes_linux.go (about)

     1  package daemon
     2  
     3  import (
     4  	"strings"
     5  
     6  	"github.com/docker/docker/api/types/mount"
     7  	"github.com/pkg/errors"
     8  )
     9  
    10  // validateBindDaemonRoot ensures that if a given mountpoint's source is within
    11  // the daemon root path, that the propagation is setup to prevent a container
    12  // from holding private refereneces to a mount within the daemon root, which
    13  // can cause issues when the daemon attempts to remove the mountpoint.
    14  func (daemon *Daemon) validateBindDaemonRoot(m mount.Mount) (bool, error) {
    15  	if m.Type != mount.TypeBind {
    16  		return false, nil
    17  	}
    18  
    19  	// check if the source is within the daemon root, or if the daemon root is within the source
    20  	if !strings.HasPrefix(m.Source, daemon.root) && !strings.HasPrefix(daemon.root, m.Source) {
    21  		return false, nil
    22  	}
    23  
    24  	if m.BindOptions == nil {
    25  		return true, nil
    26  	}
    27  
    28  	switch m.BindOptions.Propagation {
    29  	case mount.PropagationRSlave, mount.PropagationRShared, "":
    30  		return m.BindOptions.Propagation == "", nil
    31  	default:
    32  	}
    33  
    34  	return false, validationError{errors.Errorf(`invalid mount config: must use either propagation mode "rslave" or "rshared" when mount source is within the daemon root, daemon root: %q, bind mount source: %q, propagation: %q`, daemon.root, m.Source, m.BindOptions.Propagation)}
    35  }