From c81c9a9d75f179988cf858b85fe2de71bf9c2ff4 Mon Sep 17 00:00:00 2001 From: Ophestra Date: Wed, 20 Aug 2025 01:26:41 +0900 Subject: container/init: split setup ops into individual files This significantly increases readability. Signed-off-by: Ophestra --- container/inittmpfs.go | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 container/inittmpfs.go (limited to 'container/inittmpfs.go') diff --git a/container/inittmpfs.go b/container/inittmpfs.go new file mode 100644 index 00000000..d4f03237 --- /dev/null +++ b/container/inittmpfs.go @@ -0,0 +1,47 @@ +package container + +import ( + "encoding/gob" + "fmt" + "math" + "os" + . "syscall" +) + +func init() { gob.Register(new(MountTmpfsOp)) } + +// Tmpfs appends an [Op] that mounts tmpfs on container path [MountTmpfsOp.Path]. +func (f *Ops) Tmpfs(target *Absolute, size int, perm os.FileMode) *Ops { + *f = append(*f, &MountTmpfsOp{SourceTmpfsEphemeral, target, MS_NOSUID | MS_NODEV, size, perm}) + return f +} + +// Readonly appends an [Op] that mounts read-only tmpfs on container path [MountTmpfsOp.Path]. +func (f *Ops) Readonly(target *Absolute, perm os.FileMode) *Ops { + *f = append(*f, &MountTmpfsOp{SourceTmpfsReadonly, target, MS_RDONLY | MS_NOSUID | MS_NODEV, 0, perm}) + return f +} + +// MountTmpfsOp mounts [FstypeTmpfs] on container Path. +type MountTmpfsOp struct { + FSName string + Path *Absolute + Flags uintptr + Size int + Perm os.FileMode +} + +func (t *MountTmpfsOp) early(*setupState) error { return nil } +func (t *MountTmpfsOp) apply(*setupState) error { + if t.Path == nil { + return EBADE + } + if t.Size < 0 || t.Size > math.MaxUint>>1 { + return msg.WrapErr(EBADE, fmt.Sprintf("size %d out of bounds", t.Size)) + } + return mountTmpfs(t.FSName, toSysroot(t.Path.String()), t.Flags, t.Size, t.Perm) +} + +func (t *MountTmpfsOp) Is(op Op) bool { vt, ok := op.(*MountTmpfsOp); return ok && *t == *vt } +func (*MountTmpfsOp) prefix() string { return "mounting" } +func (t *MountTmpfsOp) String() string { return fmt.Sprintf("tmpfs on %q size %d", t.Path, t.Size) } -- cgit v1.3.1