github.com/dpiddy/docker@v1.12.2-rc1/volume/volume_propagation_linux.go (about)

     1  // +build linux
     2  
     3  package volume
     4  
     5  import (
     6  	"strings"
     7  )
     8  
     9  // DefaultPropagationMode defines what propagation mode should be used by
    10  // default if user has not specified one explicitly.
    11  const DefaultPropagationMode string = "rprivate"
    12  
    13  // propagation modes
    14  var propagationModes = map[string]bool{
    15  	"private":  true,
    16  	"rprivate": true,
    17  	"slave":    true,
    18  	"rslave":   true,
    19  	"shared":   true,
    20  	"rshared":  true,
    21  }
    22  
    23  // GetPropagation extracts and returns the mount propagation mode. If there
    24  // are no specifications, then by default it is "private".
    25  func GetPropagation(mode string) string {
    26  	for _, o := range strings.Split(mode, ",") {
    27  		if propagationModes[o] {
    28  			return o
    29  		}
    30  	}
    31  	return DefaultPropagationMode
    32  }
    33  
    34  // HasPropagation checks if there is a valid propagation mode present in
    35  // passed string. Returns true if a valid propagation mode specifier is
    36  // present, false otherwise.
    37  func HasPropagation(mode string) bool {
    38  	for _, o := range strings.Split(mode, ",") {
    39  		if propagationModes[o] {
    40  			return true
    41  		}
    42  	}
    43  	return false
    44  }