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package container
import (
"encoding/gob"
"fmt"
"path"
. "syscall"
"hakurei.app/check"
"hakurei.app/fhs"
)
func init() { gob.Register(new(MountDevOp)) }
// Dev appends an [Op] that mounts a subset of host /dev.
func (f *Ops) Dev(target *check.Absolute, mqueue bool) *Ops {
*f = append(*f, &MountDevOp{target, mqueue, false})
return f
}
// DevWritable appends an [Op] that mounts a writable subset of host /dev.
//
// There is usually no good reason to write to /dev, so this should always be
// followed by a [RemountOp].
func (f *Ops) DevWritable(target *check.Absolute, mqueue bool) *Ops {
*f = append(*f, &MountDevOp{target, mqueue, true})
return f
}
// MountDevOp mounts a subset of host /dev on container path Target.
// If Mqueue is true, a private instance of [FstypeMqueue] is mounted.
// If Write is true, the resulting mount point is left writable.
type MountDevOp struct {
Target *check.Absolute
Mqueue bool
Write bool
}
func (d *MountDevOp) Valid() bool { return d != nil && d.Target != nil }
func (d *MountDevOp) early(*setupState, syscallDispatcher) error { return nil }
func (d *MountDevOp) apply(state *setupState, k syscallDispatcher) error {
target := toSysroot(d.Target.String())
if err := k.mountTmpfs(SourceTmpfsDevtmpfs, target, MS_NOSUID|MS_NODEV, 0, state.ParentPerm); err != nil {
return err
}
for _, name := range []string{"null", "zero", "full", "random", "urandom", "tty"} {
targetPath := path.Join(target, name)
if err := k.ensureFile(targetPath, 0444, state.ParentPerm); err != nil {
return err
}
if err := k.bindMount(
state,
toHost(fhs.Dev+name),
targetPath,
0,
); err != nil {
return err
}
}
for i, name := range []string{"stdin", "stdout", "stderr"} {
if err := k.symlink(
fhs.Proc+"self/fd/"+string(rune(i+'0')),
path.Join(target, name),
); err != nil {
return err
}
}
for _, pair := range [][2]string{
{fhs.Proc + "self/fd", "fd"},
{fhs.Proc + "kcore", "core"},
{"pts/ptmx", "ptmx"},
} {
if err := k.symlink(pair[0], path.Join(target, pair[1])); err != nil {
return err
}
}
devShmPath := path.Join(target, "shm")
devPtsPath := path.Join(target, "pts")
for _, name := range []string{devShmPath, devPtsPath} {
if err := k.mkdir(name, state.ParentPerm); err != nil {
return err
}
}
if err := k.mount(SourceDevpts, devPtsPath, FstypeDevpts, MS_NOSUID|MS_NOEXEC,
"newinstance,ptmxmode=0666,mode=620"); err != nil {
return err
}
if state.RetainSession {
if k.isatty(Stdout) {
consolePath := path.Join(target, "console")
if err := k.ensureFile(consolePath, 0444, state.ParentPerm); err != nil {
return err
}
if name, err := k.readlink(hostProc.stdout()); err != nil {
return err
} else if err = k.bindMount(
state,
toHost(name),
consolePath,
0,
); err != nil {
return err
}
}
}
if d.Mqueue {
mqueueTarget := path.Join(target, "mqueue")
if err := k.mkdir(mqueueTarget, state.ParentPerm); err != nil {
return err
}
if err := k.mount(SourceMqueue, mqueueTarget, FstypeMqueue, MS_NOSUID|MS_NOEXEC|MS_NODEV, zeroString); err != nil {
return err
}
}
if d.Write {
return nil
}
if err := k.remount(state, target, MS_RDONLY); err != nil {
return err
}
return k.mountTmpfs(SourceTmpfs, devShmPath, MS_NOSUID|MS_NODEV, 0, 01777)
}
func (d *MountDevOp) late(*setupState, syscallDispatcher) error { return nil }
func (d *MountDevOp) Is(op Op) bool {
vd, ok := op.(*MountDevOp)
return ok && d.Valid() && vd.Valid() &&
d.Target.Is(vd.Target) &&
d.Mqueue == vd.Mqueue &&
d.Write == vd.Write
}
func (*MountDevOp) prefix() (string, bool) { return "mounting", true }
func (d *MountDevOp) String() string {
if d.Mqueue {
return fmt.Sprintf("dev on %q with mqueue", d.Target)
}
return fmt.Sprintf("dev on %q", d.Target)
}
|
