Ophestra
0e6c1a5026
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This allows use of absolute pathname values without importing container. Signed-off-by: Ophestra <cat@gensokyo.uk>
63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
package container
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import (
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"encoding/gob"
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"fmt"
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"math"
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"os"
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"strconv"
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. "syscall"
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"hakurei.app/container/check"
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)
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func init() { gob.Register(new(MountTmpfsOp)) }
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type TmpfsSizeError int
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func (e TmpfsSizeError) Error() string {
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return "tmpfs size " + strconv.Itoa(int(e)) + " out of bounds"
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}
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// Tmpfs appends an [Op] that mounts tmpfs on container path [MountTmpfsOp.Path].
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func (f *Ops) Tmpfs(target *check.Absolute, size int, perm os.FileMode) *Ops {
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*f = append(*f, &MountTmpfsOp{SourceTmpfsEphemeral, target, MS_NOSUID | MS_NODEV, size, perm})
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return f
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}
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// Readonly appends an [Op] that mounts read-only tmpfs on container path [MountTmpfsOp.Path].
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func (f *Ops) Readonly(target *check.Absolute, perm os.FileMode) *Ops {
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*f = append(*f, &MountTmpfsOp{SourceTmpfsReadonly, target, MS_RDONLY | MS_NOSUID | MS_NODEV, 0, perm})
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return f
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}
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// MountTmpfsOp mounts [FstypeTmpfs] on container Path.
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type MountTmpfsOp struct {
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FSName string
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Path *check.Absolute
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Flags uintptr
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Size int
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Perm os.FileMode
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}
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func (t *MountTmpfsOp) Valid() bool { return t != nil && t.Path != nil && t.FSName != zeroString }
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func (t *MountTmpfsOp) early(*setupState, syscallDispatcher) error { return nil }
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func (t *MountTmpfsOp) apply(_ *setupState, k syscallDispatcher) error {
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if t.Size < 0 || t.Size > math.MaxUint>>1 {
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return TmpfsSizeError(t.Size)
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}
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return k.mountTmpfs(t.FSName, toSysroot(t.Path.String()), t.Flags, t.Size, t.Perm)
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}
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func (t *MountTmpfsOp) Is(op Op) bool {
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vt, ok := op.(*MountTmpfsOp)
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return ok && t.Valid() && vt.Valid() &&
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t.FSName == vt.FSName &&
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t.Path.Is(vt.Path) &&
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t.Flags == vt.Flags &&
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t.Size == vt.Size &&
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t.Perm == vt.Perm
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}
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func (*MountTmpfsOp) prefix() (string, bool) { return "mounting", true }
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func (t *MountTmpfsOp) String() string { return fmt.Sprintf("tmpfs on %q size %d", t.Path, t.Size) }
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