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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 mount option passed")
)
type defaultMountOptions struct {
noexec bool
nosuid bool
nodev bool
}
// ProcessOptions parses the options for a bind or tmpfs mount and ensures that
// they are sensible and follow convention. The isTmpfs variable controls
// whether extra, tmpfs-specific options will be allowed.
// The sourcePath variable, if not empty, contains a bind mount source.
func ProcessOptions(options []string, isTmpfs bool, sourcePath string) ([]string, error) {
var (
foundWrite, foundSize, foundProp, foundMode, foundExec, foundSuid, foundDev, foundCopyUp, foundBind, foundZ, foundU bool
)
newOptions := make([]string, 0, len(options))
for _, opt := range options {
// Some options have parameters - size, mode
splitOpt := strings.SplitN(opt, "=", 2)
switch splitOpt[0] {
case "O":
if len(options) > 1 {
return nil, errors.Wrapf(ErrDupeMntOption, "'O' option can not be used with other options")
}
case "exec", "noexec":
if foundExec {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'noexec' and 'exec' can be used")
}
foundExec = true
case "suid", "nosuid":
if foundSuid {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'nosuid' and 'suid' can be used")
}
foundSuid = true
case "nodev", "dev":
if foundDev {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'nodev' and 'dev' can be used")
}
foundDev = true
case "rw", "ro":
if foundWrite {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'rw' and 'ro' can be used")
}
foundWrite = true
case "private", "rprivate", "slave", "rslave", "shared", "rshared", "unbindable", "runbindable":
if foundProp {
return nil, errors.Wrapf(ErrDupeMntOption, "only one root propagation mode can be used")
}
foundProp = true
case "size":
if !isTmpfs {
return nil, errors.Wrapf(ErrBadMntOption, "the 'size' option is only allowed with tmpfs mounts")
}
if foundSize {
return nil, errors.Wrapf(ErrDupeMntOption, "only one tmpfs size can be specified")
}
foundSize = true
case "mode":
if !isTmpfs {
return nil, errors.Wrapf(ErrBadMntOption, "the 'mode' option is only allowed with tmpfs mounts")
}
if foundMode {
return nil, errors.Wrapf(ErrDupeMntOption, "only one tmpfs mode can be specified")
}
foundMode = true
case "tmpcopyup":
if !isTmpfs {
return nil, errors.Wrapf(ErrBadMntOption, "the 'tmpcopyup' option is only allowed with tmpfs mounts")
}
if foundCopyUp {
return nil, errors.Wrapf(ErrDupeMntOption, "the 'tmpcopyup' or 'notmpcopyup' option can only be set once")
}
foundCopyUp = true
case "consistency":
// Often used on MACs and mistakenly on Linux platforms.
// Since Docker ignores this option so shall we.
continue
case "notmpcopyup":
if !isTmpfs {
return nil, errors.Wrapf(ErrBadMntOption, "the 'notmpcopyup' option is only allowed with tmpfs mounts")
}
if foundCopyUp {
return nil, errors.Wrapf(ErrDupeMntOption, "the 'tmpcopyup' or 'notmpcopyup' option can only be set once")
}
foundCopyUp = true
// do not propagate notmpcopyup to the OCI runtime
continue
case "bind", "rbind":
if isTmpfs {
return nil, errors.Wrapf(ErrBadMntOption, "the 'bind' and 'rbind' options are not allowed with tmpfs mounts")
}
if foundBind {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'rbind' and 'bind' can be used")
}
foundBind = true
case "z", "Z":
if isTmpfs {
return nil, errors.Wrapf(ErrBadMntOption, "the 'z' and 'Z' options are not allowed with tmpfs mounts")
}
if foundZ {
return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'z' and 'Z' can be used")
}
foundZ = true
case "U":
if foundU {
return nil, errors.Wrapf(ErrDupeMntOption, "the 'U' option can only be set once")
}
foundU = true
default:
return nil, errors.Wrapf(ErrBadMntOption, "unknown mount option %q", opt)
}
newOptions = append(newOptions, opt)
}
if !foundWrite {
newOptions = append(newOptions, "rw")
}
if !foundProp {
newOptions = append(newOptions, "rprivate")
}
defaults, err := getDefaultMountOptions(sourcePath)
if err != nil {
return nil, err
}
if !foundExec && defaults.noexec {
newOptions = append(newOptions, "noexec")
}
if !foundSuid && defaults.nosuid {
newOptions = append(newOptions, "nosuid")
}
if !foundDev && defaults.nodev {
newOptions = append(newOptions, "nodev")
}
if isTmpfs && !foundCopyUp {
newOptions = append(newOptions, "tmpcopyup")
}
if !isTmpfs && !foundBind {
newOptions = append(newOptions, "rbind")
}
return newOptions, nil
}
|
