Add mock implementation of calico-node for scale testing.

The mock node runs a set of typha clients that mimic the
load of a normal calico-node instance.  It doesn't (yet)
simulate more types of load (such as IPAM churn).

.semaphore/push-images/mock-node.yml

@@ -0,0 +1,47 @@
+version: v1.0
+name: Publish mock-node images
+agent:
+  machine:
+    type: f1-standard-2
+    os_image: ubuntu2204
+
+execution_time_limit:
+  minutes: 60
+
+global_job_config:
+  env_vars:
+    - name: DEV_REGISTRIES
+      value: quay.io/calico docker.io/calico
+  secrets:
+    - name: docker
+    - name: quay-robot-calico+semaphoreci
+  prologue:
+    commands:
+      - checkout
+      # Semaphore is doing shallow clone on a commit without tags.
+      # unshallow it for GIT_VERSION:=$(shell git describe --tags --dirty --always)
+      - retry git fetch --unshallow
+      - echo $DOCKER_TOKEN | docker login --username "$DOCKER_USER" --password-stdin
+      - echo $QUAY_TOKEN | docker login --username "$QUAY_USER" --password-stdin quay.io
+      - export BRANCH_NAME=$SEMAPHORE_GIT_BRANCH
+
+blocks:
+  - name: Publish mock-node images
+    dependencies: []
+    skip:
+      when: "branch !~ '.+'"
+    task:
+      jobs:
+        - name: Linux multi-arch
+          commands:
+            - if [ -z "${SEMAPHORE_GIT_PR_NUMBER}" ]; then make -C test-tools/mocknode cd CONFIRM=true; fi
+  - name: Publish mock-node multi-arch manifests
+    dependencies:
+      - Publish mock-node images
+    skip:
+      when: "branch !~ '.+'"
+    task:
+      jobs:
+        - name: Linux multi-arch manifests
+          commands:
+            - if [ -z "${SEMAPHORE_GIT_PR_NUMBER}" ]; then make -C test-tools/mocknode push-manifests-with-tag CONFIRM=true; fi

.semaphore/semaphore.yml.d/03-promotions.yml

@@ -31,6 +31,10 @@ promotions:
     pipeline_file: push-images/node.yml
     auto_promote:
       when: "branch =~ 'master|release-'"
+  - name: Push mock calico-node images
+    pipeline_file: push-images/mock-node.yml
+    auto_promote:
+      when: "branch =~ 'master|release-'"
   - name: Push cni-plugin images
     pipeline_file: push-images/cni-plugin.yml
     auto_promote:

.semaphore/semaphore.yml.d/blocks/60-mock-node.yml

@@ -0,0 +1,13 @@
+- name: Mock node
+  run:
+    when: "${FORCE_RUN} or change_in(['/*', '/test-tools/mocknode/'], {exclude: ['/**/.gitignore', '/**/README.md', '/**/LICENSE']${DEFAULT_BRANCH}})"
+  dependencies:
+    - Prerequisites
+  task:
+    prologue:
+      commands:
+        - cd test-tools/mocknode
+    jobs:
+      - name: Mock node
+        commands:
+          - ../../.semaphore/run-and-monitor make-ci.log make ci

test-tools/mocknode/Dockerfile

@@ -0,0 +1,37 @@
+# Copyright (c) 2023 Tigera, Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM scratch AS source
+
+ARG TARGETARCH
+
+# And the mock-node itself...
+COPY bin/test-tools/mocknode-${TARGETARCH} /usr/bin/mocknode
+
+FROM calico/base
+
+ARG GIT_VERSION=unknown
+
+# Required labels for certification
+LABEL description="Calico mock node for scale testing"
+LABEL maintainer="[email protected]"
+LABEL name="Calico mock node"
+LABEL release="1"
+LABEL summary="Calico mock node for scale testing"
+LABEL vendor="Tigera"
+LABEL version=${GIT_VERSION}
+
+COPY --from=source / /
+
+ENTRYPOINT ["/usr/bin/mocknode"]

test-tools/mocknode/Makefile

@@ -0,0 +1,95 @@
+include ../../metadata.mk
+
+PACKAGE_NAME?=github.com/projectcalico/calico/test-tools/mocknode
+
+IMAGE_NAME  ?=mock-node
+BUILD_IMAGES          ?=$(IMAGE_NAME)
+
+###############################################################################
+# Shortcut targets
+###############################################################################
+default: build image
+test: ut ## Run the tests for the current platform/architecture
+
+###############################################################################
+# Variables controlling the image
+###############################################################################
+CONTAINER_CREATED=.container.created-$(ARCH)
+# Files that go into the image
+BINARY=./bin/test-tools/mocknode-$(ARCH)
+# Files to be built
+SRC_FILES=$(shell find . -name '*.go' | grep -v vendor) \
+          $(shell find ../../libcalico-go -name '*.go' | grep -v vendor)\
+          $(shell find ../../typha -name '*.go' | grep -v vendor)
+
+###############################################################################
+# Include ../../lib.Makefile
+#   Additions to EXTRA_DOCKER_ARGS need to happen before the include since
+#   that variable is evaluated when we declare DOCKER_RUN and siblings.
+###############################################################################
+include ../../lib.Makefile
+
+###############################################################################
+## Clean enough that a new release build will be clean
+###############################################################################
+.PHONY: clean
+clean:
+	find . -name '*.created' -exec rm -f {} +
+	find . -name '*.created-$(ARCH)' -exec rm -f {} +
+	find . -name '*.pyc' -exec rm -f {} +
+	rm -rf .go-pkg-cache bin
+	# Delete images that we built in this repo
+	-docker rmi $(IMAGE_NAME):latest-$(ARCH)
+
+###############################################################################
+# Building the binary
+###############################################################################
+
+LDFLAGS = -X main.VERSION=$(GIT_VERSION)
+
+.PHONY: build-all
+## Build the binaries for all architectures and platforms
+build-all: $(addprefix bin/mocknode-,$(VALIDARCHES))
+
+.PHONY: build
+## Build the binary for the current architecture and platform
+build: $(BINARY)
+bin/test-tools/mocknode-amd64: ARCH=amd64
+bin/test-tools/mocknode-%: $(SRC_FILES)
+	$(call build_binary, ./cmd/mocknode, $@)
+
+###############################################################################
+# Building the image
+###############################################################################
+## Create the image for the current ARCH
+image: $(IMAGE_NAME)
+
+## Create the images for all supported ARCHes
+image-all: $(addprefix sub-image-,$(VALIDARCHES))
+sub-image-%:
+	$(MAKE) image ARCH=$*
+
+$(IMAGE_NAME): $(CONTAINER_CREATED)
+$(CONTAINER_CREATED): Dockerfile $(BINARY)
+	$(DOCKER_BUILD) -t $(IMAGE_NAME):latest-$(ARCH) -f Dockerfile .
+	$(MAKE) retag-build-images-with-registries VALIDARCHES=$(ARCH) IMAGETAG=latest
+	touch $@
+
+## Run the tests in a container. Useful for CI, Mac dev
+ut:
+	mkdir -p report
+	$(DOCKER_RUN) $(CALICO_BUILD) /bin/bash -c "$(GIT_CONFIG_SSH) go test -v $(GOTEST_ARGS) ./..."
+
+fv:
+	echo "Currently has no FV tests."
+
+st:
+	echo "Currently has no STs."
+
+###############################################################################
+# CI/CD
+###############################################################################
+.PHONY: ci
+ci: clean image test static-checks
+## Deploys images to registry
+cd: image-all cd-common