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|
package bwrap
import (
"encoding/gob"
"os"
"strconv"
)
func init() {
gob.Register(new(PermConfig[SymlinkConfig]))
gob.Register(new(PermConfig[*TmpfsConfig]))
gob.Register(new(OverlayConfig))
}
type PositionalArg int
func (p PositionalArg) Unwrap() string {
return positionalArgs[p]
}
const (
Tmpfs PositionalArg = iota
Symlink
Bind
BindTry
DevBind
DevBindTry
ROBind
ROBindTry
Chmod
Dir
RemountRO
Procfs
DevTmpfs
Mqueue
Perms
Size
OverlaySrc
Overlay
TmpOverlay
ROOverlay
)
var positionalArgs = [...]string{
Tmpfs: "--tmpfs",
Symlink: "--symlink",
Bind: "--bind",
BindTry: "--bind-try",
DevBind: "--dev-bind",
DevBindTry: "--dev-bind-try",
ROBind: "--ro-bind",
ROBindTry: "--ro-bind-try",
Chmod: "--chmod",
Dir: "--dir",
RemountRO: "--remount-ro",
Procfs: "--proc",
DevTmpfs: "--dev",
Mqueue: "--mqueue",
Perms: "--perms",
Size: "--size",
OverlaySrc: "--overlay-src",
Overlay: "--overlay",
TmpOverlay: "--tmp-overlay",
ROOverlay: "--ro-overlay",
}
type PermConfig[T FSBuilder] struct {
// set permissions of next argument
// (--perms OCTAL)
Mode *os.FileMode `json:"mode,omitempty"`
// path to get the new permission
// (--bind-data, --file, etc.)
Inner T `json:"path"`
}
func (p *PermConfig[T]) Path() string {
return p.Inner.Path()
}
func (p *PermConfig[T]) Len() int {
if p.Mode != nil {
return p.Inner.Len() + 2
} else {
return p.Inner.Len()
}
}
func (p *PermConfig[T]) Append(args *[]string) {
if p.Mode != nil {
*args = append(*args, Perms.Unwrap(), strconv.FormatInt(int64(*p.Mode), 8))
}
p.Inner.Append(args)
}
type TmpfsConfig struct {
// set size of tmpfs
// (--size BYTES)
Size int `json:"size,omitempty"`
// mount point of new tmpfs
// (--tmpfs DEST)
Dir string `json:"dir"`
}
func (t *TmpfsConfig) Path() string {
return t.Dir
}
func (t *TmpfsConfig) Len() int {
if t.Size > 0 {
return 4
} else {
return 2
}
}
func (t *TmpfsConfig) Append(args *[]string) {
if t.Size > 0 {
*args = append(*args, Size.Unwrap(), strconv.Itoa(t.Size))
}
*args = append(*args, Tmpfs.Unwrap(), t.Dir)
}
type OverlayConfig struct {
/*
read files from SRC in the following overlay
(--overlay-src SRC)
*/
Src []string `json:"src,omitempty"`
/*
mount overlayfs on DEST, with RWSRC as the host path for writes and
WORKDIR an empty directory on the same filesystem as RWSRC
(--overlay RWSRC WORKDIR DEST)
if nil, mount overlayfs on DEST, with writes going to an invisible tmpfs
(--tmp-overlay DEST)
if either strings are empty, mount overlayfs read-only on DEST
(--ro-overlay DEST)
*/
Persist *[2]string `json:"persist,omitempty"`
/*
--overlay RWSRC WORKDIR DEST
--tmp-overlay DEST
--ro-overlay DEST
*/
Dest string `json:"dest"`
}
func (o *OverlayConfig) Path() string {
return o.Dest
}
func (o *OverlayConfig) Len() int {
// (--tmp-overlay DEST) or (--ro-overlay DEST)
p := 2
// (--overlay RWSRC WORKDIR DEST)
if o.Persist != nil && o.Persist[0] != "" && o.Persist[1] != "" {
p = 4
}
return p + len(o.Src)*2
}
func (o *OverlayConfig) Append(args *[]string) {
// --overlay-src SRC
for _, src := range o.Src {
*args = append(*args, OverlaySrc.Unwrap(), src)
}
if o.Persist != nil {
if o.Persist[0] != "" && o.Persist[1] != "" {
// --overlay RWSRC WORKDIR
*args = append(*args, Overlay.Unwrap(), o.Persist[0], o.Persist[1])
} else {
// --ro-overlay
*args = append(*args, ROOverlay.Unwrap())
}
} else {
// --tmp-overlay
*args = append(*args, TmpOverlay.Unwrap())
}
// DEST
*args = append(*args, o.Dest)
}
type SymlinkConfig [2]string
func (s SymlinkConfig) Path() string {
return s[1]
}
func (s SymlinkConfig) Len() int {
return 3
}
func (s SymlinkConfig) Append(args *[]string) {
*args = append(*args, Symlink.Unwrap(), s[0], s[1])
}
type ChmodConfig map[string]os.FileMode
func (c ChmodConfig) Len() int {
return len(c)
}
func (c ChmodConfig) Append(args *[]string) {
for path, mode := range c {
*args = append(*args, Chmod.Unwrap(), strconv.FormatInt(int64(mode), 8), path)
}
}
|
