tests: fix image name repeatability

tests/e2e.sh tries to update manifests for several resources as part of
testing. Repeated runs may not correctly update the manifests on
subsequent passes.

Ensure it's updated each time, and reset the state back to clean.

Signed-off-by: Robin H. Johnson <rjohnson@coreweave.com>

tests/e2e.sh

@@ -42,6 +42,10 @@ function finish() {
     kill %1 || true
     kubectl delete -f examples/standard/ || true
     kubectl delete -f tests/manifests/ || true
+    # Ensure this is a clean state before next tests
+    mv -f ./examples/standard/deployment.yaml{.bak,} || true
+    mv -f ./examples/daemonsetsharding/deployment.yaml{.bak,} || true
+    mv -f ./examples/daemonsetsharding/daemonset.yaml{.bak,} || true
 }
 
 function setup_kind() {
@@ -95,8 +99,8 @@ function kube_state_metrics_up() {
     fi
 }
 function test_daemonset() {
-    sed -i "s|${KUBE_STATE_METRICS_CURRENT_IMAGE_NAME}:v.*|${KUBE_STATE_METRICS_IMAGE_NAME}:${KUBE_STATE_METRICS_IMAGE_TAG}|g" ./examples/daemonsetsharding/deployment.yaml
-    sed -i "s|${KUBE_STATE_METRICS_CURRENT_IMAGE_NAME}:v.*|${KUBE_STATE_METRICS_IMAGE_NAME}:${KUBE_STATE_METRICS_IMAGE_TAG}|g" ./examples/daemonsetsharding/daemonset.yaml
+    set_image_name ./examples/daemonsetsharding/deployment.yaml
+    set_image_name ./examples/daemonsetsharding/daemonset.yaml
 
     kubectl get deployment -n kube-system
     kubectl create -f ./examples/daemonsetsharding
@@ -119,6 +123,16 @@ function test_daemonset() {
     sleep 20
 }
 
+set_image_name() {
+    f=$1
+    # Change the stock name as well as the temporary name, to the new value.
+    local new=${KUBE_STATE_METRICS_IMAGE_NAME}:${KUBE_STATE_METRICS_IMAGE_TAG}
+    sed -i.bak \
+        -e "s|image: ${KUBE_STATE_METRICS_CURRENT_IMAGE_NAME}:v.*|image: ${new}|g" \
+        -e "s|image: ${KUBE_STATE_METRICS_IMAGE_NAME}:v.*|image: ${new}|g" \
+        "${f}"
+}
+
 
 is_kube_running="false"
 
@@ -152,7 +166,7 @@ echo "local kube-state-metrics image tag: $KUBE_STATE_METRICS_IMAGE_TAG"
 kind load docker-image "${KUBE_STATE_METRICS_IMAGE_NAME}:${KUBE_STATE_METRICS_IMAGE_TAG}"
 
 # update kube-state-metrics image tag in deployment.yaml
-sed -i.bak "s|${KUBE_STATE_METRICS_CURRENT_IMAGE_NAME}:v.*|${KUBE_STATE_METRICS_IMAGE_NAME}:${KUBE_STATE_METRICS_IMAGE_TAG}|g" ./examples/standard/deployment.yaml
+set_image_name ./examples/standard/deployment.yaml
 
 mkdir -p ${KUBE_STATE_METRICS_LOG_DIR}