container/init: wrap syscall helper functions

This allows tests to stub all kernel behaviour, enabling measurement of all function call arguments and error injection.

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

container/mount_test.go

@@ -2,7 +2,6 @@ package container
 
 import (
 	"os"
-	"slices"
 	"testing"
 )
 
@@ -48,85 +47,3 @@ func TestEscapeOverlayDataSegment(t *testing.T) {
 		})
 	}
 }
-
-type opValidTestCase struct {
-	name string
-	op   Op
-	want bool
-}
-
-func checkOpsValid(t *testing.T, testCases []opValidTestCase) {
-	t.Run("valid", func(t *testing.T) {
-		for _, tc := range testCases {
-			t.Run(tc.name, func(t *testing.T) {
-				if got := tc.op.Valid(); got != tc.want {
-					t.Errorf("Valid: %v, want %v", got, tc.want)
-				}
-			})
-		}
-	})
-}
-
-type opsBuilderTestCase struct {
-	name string
-	ops  *Ops
-	want Ops
-}
-
-func checkOpsBuilder(t *testing.T, testCases []opsBuilderTestCase) {
-	t.Run("build", func(t *testing.T) {
-		for _, tc := range testCases {
-			t.Run(tc.name, func(t *testing.T) {
-				if !slices.EqualFunc(*tc.ops, tc.want, func(op Op, v Op) bool { return op.Is(v) }) {
-					t.Errorf("Ops: %#v, want %#v", tc.ops, tc.want)
-				}
-			})
-		}
-	})
-}
-
-type opIsTestCase struct {
-	name  string
-	op, v Op
-	want  bool
-}
-
-func checkOpIs(t *testing.T, testCases []opIsTestCase) {
-	t.Run("is", func(t *testing.T) {
-		for _, tc := range testCases {
-			t.Run(tc.name, func(t *testing.T) {
-				if got := tc.op.Is(tc.v); got != tc.want {
-					t.Errorf("Is: %v, want %v", got, tc.want)
-				}
-			})
-		}
-	})
-}
-
-type opMetaTestCase struct {
-	name string
-	op   Op
-
-	wantPrefix string
-	wantString string
-}
-
-func checkOpMeta(t *testing.T, testCases []opMetaTestCase) {
-	t.Run("meta", func(t *testing.T) {
-		for _, tc := range testCases {
-			t.Run(tc.name, func(t *testing.T) {
-				t.Run("prefix", func(t *testing.T) {
-					if got := tc.op.prefix(); got != tc.wantPrefix {
-						t.Errorf("prefix: %q, want %q", got, tc.wantPrefix)
-					}
-				})
-
-				t.Run("string", func(t *testing.T) {
-					if got := tc.op.String(); got != tc.wantString {
-						t.Errorf("String: %s, want %s", got, tc.wantString)
-					}
-				})
-			})
-		}
-	})
-}