fix(conformance): use manual retry loop instead of client-go/retry

The module cache only has k8s.io/apimachinery available (via
controller-runtime dependency), not k8s.io/client-go. Use a
manual exponential backoff loop with apierrors.IsConflict.

Author: mahmut-Abi

.github/workflows/conformance.yml

@@ -75,16 +75,34 @@ jobs:
           apply_file="$(go env GOMODCACHE)/sigs.k8s.io/gateway-api/conformance@v1.5.1/utils/kubernetes/apply.go"
           chmod u+w "$apply_file"
           python3 - "$apply_file" << 'PYEOF'
-          import sys, re
+          import sys
           path = sys.argv[1]
           content = open(path).read()
+          old = '\t\tuObj.SetResourceVersion(fetchedObj.GetResourceVersion())\n\t\ttlog.Logf(t, "Updating %s %s", uObj.GetName(), uObj.GetKind())\n\t\terr = c.Update(ctx, uObj)'
+          new = '''\t\tuObj.SetResourceVersion(fetchedObj.GetResourceVersion())
+          \t\ttlog.Logf(t, "Updating %s %s", uObj.GetName(), uObj.GetKind())
+          \t\tfor i := 0; i < 5; i++ {
+          \t\t\tif i > 0 {
+          \t\t\t\ttime.Sleep(time.Duration(1<<i) * 100 * time.Millisecond)
+          \t\t\t\tlatest := &unstructured.Unstructured{}
+          \t\t\t\tlatest.SetGroupVersionKind(uObj.GroupVersionKind())
+          \t\t\t\tif getErr := c.Get(ctx, client.ObjectKeyFromObject(uObj), latest); getErr != nil {
+          \t\t\t\t\terr = getErr
+          \t\t\t\t\tbreak
+          \t\t\t\t}
+          \t\t\t\tuObj.SetResourceVersion(latest.GetResourceVersion())
+          \t\t\t}
+          \t\t\terr = c.Update(ctx, uObj)
+          \t\t\tif err == nil || !apierrors.IsConflict(err) {
+          \t\t\t\tbreak
+          \t\t\t}
+          \t\t}'''
+          content = content.replace(old, new)
+          # Add time import
           content = content.replace(
-              '"sigs.k8s.io/controller-runtime/pkg/client"',
-              '"sigs.k8s.io/controller-runtime/pkg/client"\n\t"k8s.io/client-go/util/retry"'
+              '"testing"',
+              '"testing"\n\t"time"'
           )
-          old = '		uObj.SetResourceVersion(fetchedObj.GetResourceVersion())\n		tlog.Logf(t, "Updating %s %s", uObj.GetName(), uObj.GetKind())\n		err = c.Update(ctx, uObj)'
-          new = '		uObj.SetResourceVersion(fetchedObj.GetResourceVersion())\n		tlog.Logf(t, "Updating %s %s", uObj.GetName(), uObj.GetKind())\n		err = retry.RetryOnConflict(retry.DefaultBackoff, func() error {\n			latest := &unstructured.Unstructured{}\n			latest.SetGroupVersionKind(uObj.GroupVersionKind())\n			if getErr := c.Get(ctx, client.ObjectKeyFromObject(uObj), latest); getErr != nil {\n				return getErr\n			}\n			uObj.SetResourceVersion(latest.GetResourceVersion())\n			return c.Update(ctx, uObj)\n		})'
-          content = content.replace(old, new)
           open(path, 'w').write(content)
           print("Patched apply.go with conflict retry")
           PYEOF