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|
package hst
import (
"encoding/gob"
"strings"
"hakurei.app/check"
"hakurei.app/container/fhs"
"hakurei.app/container/std"
)
func init() { gob.Register(new(FSBind)) }
// FilesystemBind is the type string of a bind mount point.
const FilesystemBind = "bind"
// FSBind represents a host to container bind mount.
type FSBind struct {
// Pathname in the container mount namespace. Same as Source if nil.
Target *check.Absolute `json:"dst,omitempty"`
// Pathname in the init mount namespace. Must not be nil.
Source *check.Absolute `json:"src"`
// Do not remount Target read-only.
// This has no effect if Source is mounted read-only in the init mount namespace.
Write bool `json:"write,omitempty"`
// Allow access to devices (special files) on Target, implies Write.
Device bool `json:"dev,omitempty"`
// Create Source as a directory in the init mount namespace if it does not exist.
Ensure bool `json:"ensure,omitempty"`
// Silently skip this mount point if Source does not exist in the init mount namespace.
Optional bool `json:"optional,omitempty"`
/* Enable special behaviour:
For autoroot: Target must be [fhs.Root].
For autoetc: Target must be [fhs.Etc]. */
Special bool `json:"special,omitempty"`
}
// IsAutoRoot returns whether this FSBind has autoroot behaviour enabled.
func (b *FSBind) IsAutoRoot() bool {
return b.Valid() && b.Special && b.Target.String() == fhs.Root
}
// IsAutoEtc returns whether this FSBind has autoetc behaviour enabled.
func (b *FSBind) IsAutoEtc() bool {
return b.Valid() && b.Special && b.Target.String() == fhs.Etc
}
func (b *FSBind) Valid() bool {
if b == nil || b.Source == nil {
return false
}
if b.Ensure && b.Optional {
return false
}
if b.Special {
if b.Target == nil {
return false
} else {
switch b.Target.String() {
case fhs.Root, fhs.Etc:
break
default:
return false
}
}
}
return true
}
func (b *FSBind) Path() *check.Absolute {
if !b.Valid() {
return nil
}
if b.Target == nil {
return b.Source
}
return b.Target
}
func (b *FSBind) Host() []*check.Absolute {
if !b.Valid() {
return nil
}
return []*check.Absolute{b.Source}
}
func (b *FSBind) Apply(z *ApplyState) {
if !b.Valid() {
return
}
target := b.Target
if target == nil {
target = b.Source
}
var flags int
if b.Write {
flags |= std.BindWritable
}
if b.Device {
flags |= std.BindDevice | std.BindWritable
}
if b.Ensure {
flags |= std.BindEnsure
}
if b.Optional {
flags |= std.BindOptional
}
switch {
case b.IsAutoRoot():
z.Root(b.Source, flags)
case b.IsAutoEtc():
z.Etc(b.Source, z.AutoEtcPrefix)
default:
z.Bind(b.Source, target, flags)
}
}
func (b *FSBind) String() string {
if !b.Valid() {
return "<invalid>"
}
var flagSym string
if b.Device {
flagSym = "d"
} else if b.Write {
flagSym = "w"
}
if b.Special {
switch {
case b.IsAutoRoot():
prefix := "autoroot"
if flagSym != "" {
prefix += ":" + flagSym
}
if b.Source.String() != fhs.Root {
return prefix + ":" + b.Source.String()
}
return prefix
case b.IsAutoEtc():
return "autoetc:" + b.Source.String()
}
}
g := 4 + len(b.Source.String())
if b.Target != nil {
g += len(b.Target.String())
}
expr := new(strings.Builder)
expr.Grow(g)
expr.WriteString(flagSym)
switch {
case b.Ensure:
expr.WriteString("-")
case b.Optional:
expr.WriteString("+")
default:
expr.WriteString("*")
}
expr.WriteString(b.Source.String())
if b.Target != nil {
expr.WriteString(":" + b.Target.String())
}
return expr.String()
}
|
