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package hst
import (
"encoding/gob"
"os"
"strings"
"hakurei.app/container/check"
)
func init() { gob.Register(new(FSEphemeral)) }
// FilesystemEphemeral is the type string of a mount point with ephemeral state.
const FilesystemEphemeral = "ephemeral"
// FSEphemeral represents an ephemeral container mount point.
type FSEphemeral struct {
// Pathname in the container mount namespace.
Target *check.Absolute `json:"dst"`
// Do not mount filesystem read-only.
Write bool `json:"write,omitempty"`
// Upper limit on the size of the filesystem.
Size int `json:"size,omitempty"`
// Initial permission bits of the new filesystem.
Perm os.FileMode `json:"perm,omitempty"`
}
func (e *FSEphemeral) Valid() bool { return e != nil && e.Target != nil }
func (e *FSEphemeral) Path() *check.Absolute {
if !e.Valid() {
return nil
}
return e.Target
}
func (e *FSEphemeral) Host() []*check.Absolute { return nil }
const fsEphemeralDefaultPerm = os.FileMode(0755)
func (e *FSEphemeral) Apply(z *ApplyState) {
if !e.Valid() {
return
}
size := e.Size
if size < 0 {
size = 0
}
perm := e.Perm
if perm == 0 {
perm = fsEphemeralDefaultPerm
}
if e.Write {
z.Tmpfs(e.Target, size, perm)
} else {
z.Readonly(e.Target, perm)
}
}
func (e *FSEphemeral) String() string {
if !e.Valid() {
return "<invalid>"
}
expr := new(strings.Builder)
expr.Grow(15 + len(FilesystemEphemeral) + len(e.Target.String()))
if e.Write {
expr.WriteString("w")
}
expr.WriteString("+" + FilesystemEphemeral + "(")
if e.Perm != 0 {
expr.WriteString(e.Perm.String())
} else {
expr.WriteString(fsEphemeralDefaultPerm.String())
}
expr.WriteString("):" + e.Target.String())
return expr.String()
}
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