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package util
import (
"strings"
"github.com/pkg/errors"
)
var (
// ErrBadMntOption indicates that an invalid mount option was passed.
ErrBadMntOption = errors.Errorf("invalid mount option")
// ErrDupeMntOption indicates that a duplicate mount option was passed.
ErrDupeMntOption = errors.Errorf("duplicate option passed")
)
// ProcessOptions parses the options for a bind mount and ensures that they are
// sensible and follow convention.
func ProcessOptions(options []string) []string {
var (
foundbind, foundrw, foundro bool
rootProp string
)
for _, opt := range options {
switch opt {
case "bind", "rbind":
foundbind = true
case "ro":
foundro = true
case "rw":
foundrw = true
case "private", "rprivate", "slave", "rslave", "shared", "rshared":
rootProp = opt
}
}
if !foundbind {
options = append(options, "rbind")
}
if !foundrw && !foundro {
options = append(options, "rw")
}
if rootProp == "" {
options = append(options, "rprivate")
}
return options
}
// ProcessTmpfsOptions parses the options for a tmpfs mountpoint and ensures
// that they are sensible and follow convention.
func ProcessTmpfsOptions(options []string) ([]string, error) {
var (
foundWrite, foundSize, foundProp, foundMode bool
)
baseOpts := []string{"noexec", "nosuid", "nodev"}
for _, opt := range options {
// Some options have parameters - size, mode
splitOpt := strings.SplitN(opt, "=", 2)
switch splitOpt[0] {
case "rw", "ro":
if foundWrite {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of rw and ro can be used")
}
foundWrite = true
baseOpts = append(baseOpts, opt)
case "private", "rprivate", "slave", "rslave", "shared", "rshared":
if foundProp {
return nil, errors.Wrapf(ErrDupeMntOption, "only one root propagation mode can be used")
}
foundProp = true
baseOpts = append(baseOpts, opt)
case "size":
if foundSize {
return nil, errors.Wrapf(ErrDupeMntOption, "only one tmpfs size can be specified")
}
foundSize = true
baseOpts = append(baseOpts, opt)
case "mode":
if foundMode {
return nil, errors.Wrapf(ErrDupeMntOption, "only one tmpfs mode can be specified")
}
foundMode = true
baseOpts = append(baseOpts, opt)
case "noexec", "nodev", "nosuid":
// Do nothing. We always include these even if they are
// not explicitly requested.
default:
return nil, errors.Wrapf(ErrBadMntOption, "unknown tmpfs option %q", opt)
}
}
if !foundWrite {
baseOpts = append(baseOpts, "rw")
}
if !foundProp {
baseOpts = append(baseOpts, "rprivate")
}
return baseOpts, nil
}
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