container/autoroot: remove prefix field

This field has been a noop for a long time. Remove it to prevent further confusion.

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

container/autoroot.go

@@ -10,14 +10,13 @@ func init() { gob.Register(new(AutoRootOp)) }
 
 // Root appends an [Op] that expands a directory into a toplevel bind mount mirror on container root.
 // This is not a generic setup op. It is implemented here to reduce ipc overhead.
-func (f *Ops) Root(host *Absolute, prefix string, flags int) *Ops {
-	*f = append(*f, &AutoRootOp{host, prefix, flags, nil})
+func (f *Ops) Root(host *Absolute, flags int) *Ops {
+	*f = append(*f, &AutoRootOp{host, flags, nil})
 	return f
 }
 
 type AutoRootOp struct {
 	Host *Absolute
-	Prefix string
 	// passed through to bindMount
 	Flags int
 
@@ -71,12 +70,11 @@ func (r *AutoRootOp) Is(op Op) bool {
 	vr, ok := op.(*AutoRootOp)
 	return ok && r.Valid() && vr.Valid() &&
 		r.Host.Is(vr.Host) &&
-		r.Prefix == vr.Prefix &&
 		r.Flags == vr.Flags
 }
 func (*AutoRootOp) prefix() string { return "setting up" }
 func (r *AutoRootOp) String() string {
-	return fmt.Sprintf("auto root %q prefix %s flags %#x", r.Host, r.Prefix, r.Flags)
+	return fmt.Sprintf("auto root %q flags %#x", r.Host, r.Flags)
 }
 
 // IsAutoRootBindable returns whether a dir entry name is selected for AutoRoot.

container/autoroot_test.go

@@ -10,7 +10,7 @@ import (
 func TestAutoRootOp(t *testing.T) {
 	t.Run("nonrepeatable", func(t *testing.T) {
 		wantErr := msg.WrapErr(fs.ErrInvalid, "autoroot is not repeatable")
-		if err := (&AutoRootOp{Prefix: "81ceabb30d37bbdb3868004629cb84e9"}).apply(&setupState{nonrepeatable: nrAutoRoot}, nil); !errors.Is(err, wantErr) {
+		if err := new(AutoRootOp).apply(&setupState{nonrepeatable: nrAutoRoot}, nil); !errors.Is(err, wantErr) {
 			t.Errorf("apply: error = %v, want %v", err, wantErr)
 		}
 	})
@@ -18,7 +18,6 @@ func TestAutoRootOp(t *testing.T) {
 	checkOpBehaviour(t, []opBehaviourTestCase{
 		{"readdir", &Params{ParentPerm: 0750}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: "81ceabb30d37bbdb3868004629cb84e9",
 			Flags: BindWritable,
 		}, []kexpect{
 			{"readdir", expectArgs{"/"}, stubDir(), errUnique},
@@ -26,7 +25,6 @@ func TestAutoRootOp(t *testing.T) {
 
 		{"early", &Params{ParentPerm: 0750}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: "81ceabb30d37bbdb3868004629cb84e9",
 			Flags: BindWritable,
 		}, []kexpect{
 			{"readdir", expectArgs{"/"}, stubDir("bin", "dev", "etc", "home", "lib64",
@@ -36,7 +34,6 @@ func TestAutoRootOp(t *testing.T) {
 
 		{"apply", &Params{ParentPerm: 0750}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: "81ceabb30d37bbdb3868004629cb84e9",
 			Flags: BindWritable,
 		}, []kexpect{
 			{"readdir", expectArgs{"/"}, stubDir("bin", "dev", "etc", "home", "lib64",
@@ -59,7 +56,6 @@ func TestAutoRootOp(t *testing.T) {
 
 		{"success pd", &Params{ParentPerm: 0750}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: "81ceabb30d37bbdb3868004629cb84e9",
 			Flags: BindWritable,
 		}, []kexpect{
 			{"readdir", expectArgs{"/"}, stubDir("bin", "dev", "etc", "home", "lib64",
@@ -91,7 +87,6 @@ func TestAutoRootOp(t *testing.T) {
 
 		{"success", &Params{ParentPerm: 0750}, &AutoRootOp{
 			Host: MustAbs("/var/lib/planterette/base/debian:f92c9052"),
-			Prefix: "81ceabb30d37bbdb3868004629cb84e9",
 		}, []kexpect{
 			{"readdir", expectArgs{"/var/lib/planterette/base/debian:f92c9052"}, stubDir("bin", "dev", "etc", "home", "lib64",
 				"lost+found", "mnt", "nix", "proc", "root", "run", "srv", "sys", "tmp", "usr", "var"), nil},
@@ -128,10 +123,9 @@ func TestAutoRootOp(t *testing.T) {
 	})
 
 	checkOpsBuilder(t, []opsBuilderTestCase{
-		{"pd", new(Ops).Root(MustAbs("/"), "048090b6ed8f9ebb10e275ff5d8c0659", BindWritable), Ops{
+		{"pd", new(Ops).Root(MustAbs("/"), BindWritable), Ops{
 			&AutoRootOp{
 				Host:  MustAbs("/"),
-				Prefix: "048090b6ed8f9ebb10e275ff5d8c0659",
 				Flags: BindWritable,
 			},
 		}},
@@ -142,52 +136,34 @@ func TestAutoRootOp(t *testing.T) {
 
 		{"internal ne", &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable,
 		}, &AutoRootOp{
 			Host:     MustAbs("/"),
-			Prefix:   ":3",
 			Flags:    BindWritable,
 			resolved: []Op{new(BindMountOp)},
 		}, true},
 
-		{"prefix differs", &AutoRootOp{
-			Host:   MustAbs("/"),
-			Prefix: "\x00",
-			Flags:  BindWritable,
-		}, &AutoRootOp{
-			Host:   MustAbs("/"),
-			Prefix: ":3",
-			Flags:  BindWritable,
-		}, false},
-
 		{"flags differs", &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable | BindDevice,
 		}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable,
 		}, false},
 
 		{"host differs", &AutoRootOp{
 			Host:  MustAbs("/tmp/"),
-			Prefix: ":3",
 			Flags: BindWritable,
 		}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable,
 		}, false},
 
 		{"equals", &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable,
 		}, &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable,
 		}, true},
 	})
@@ -195,9 +171,8 @@ func TestAutoRootOp(t *testing.T) {
 	checkOpMeta(t, []opMetaTestCase{
 		{"root", &AutoRootOp{
 			Host:  MustAbs("/"),
-			Prefix: ":3",
 			Flags: BindWritable,
-		}, "setting up", `auto root "/" prefix :3 flags 0x2`},
+		}, "setting up", `auto root "/" flags 0x2`},
 	})
 }
 

internal/app/app_pd_linux_test.go

@@ -43,7 +43,7 @@ var testCasesPd = []sealTestCase{
 				"XDG_SESSION_TYPE=tty",
 			},
 			Ops: new(container.Ops).
-				Root(m("/"), "4a450b6596d7bc15bd01780eb9a607ac", container.BindWritable).
+				Root(m("/"), container.BindWritable).
 				Proc(m("/proc/")).
 				Tmpfs(hst.AbsTmp, 4096, 0755).
 				DevWritable(m("/dev/"), true).
@@ -179,7 +179,7 @@ var testCasesPd = []sealTestCase{
 				"XDG_SESSION_TYPE=tty",
 			},
 			Ops: new(container.Ops).
-				Root(m("/"), "ebf083d1b175911782d413369b64ce7c", container.BindWritable).
+				Root(m("/"), container.BindWritable).
 				Proc(m("/proc/")).
 				Tmpfs(hst.AbsTmp, 4096, 0755).
 				DevWritable(m("/dev/"), true).

internal/app/container_linux.go

@@ -75,7 +75,7 @@ func newContainer(s *hst.ContainerConfig, os sys.State, prefix string, uid, gid
 	}
 
 	if s.AutoRoot != nil {
-		params.Root(s.AutoRoot, prefix, s.RootFlags)
+		params.Root(s.AutoRoot, s.RootFlags)
 	}
 
 	params.