container/ops: move Op type to init file

This helps with the eventual separation of all setup ops into individual files.

Signed-off-by: Ophestra <cat@gensokyo.uk>

1 files changed, 34 insertions, 0 deletions

diff --git a/container/init.go b/container/init.go
index 0f888fad..d516a3c2 100644
--- a/container/init.go
+++ b/container/init.go
@@ -9,6 +9,7 @@ import (
 	"os/signal"
 	"path"
 	"runtime"
+	"slices"
 	"strconv"
 	. "syscall"
 	"time"
@@ -37,6 +38,39 @@ const (
 	setupEnv = "HAKUREI_SETUP"
 )
 
+type (
+	// Ops is a collection of [Op].
+	Ops []Op
+
+	// Op is a generic setup step ran inside the container init.
+	// Implementations of this interface are sent as a stream of gobs.
+	Op interface {
+		// early is called in host root.
+		early(state *setupState) error
+		// apply is called in intermediate root.
+		apply(state *setupState) error
+
+		prefix() string
+		Is(op Op) bool
+		fmt.Stringer
+	}
+
+	// setupState persists context between Ops.
+	setupState struct {
+		nonrepeatable uintptr
+		*Params
+	}
+)
+
+// Grow grows the slice Ops points to using [slices.Grow].
+func (f *Ops) Grow(n int) { *f = slices.Grow(*f, n) }
+
+const (
+	nrAutoEtc = 1 << iota
+	nrAutoRoot
+)
+
+// initParams are params passed from parent.
 type initParams struct {
 	Params