From caee5a05fe748867c06cf7adccc9514a5a3711d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan-Otto=20Kr=C3=B6pke?= <github@jkroepke.de>
Date: Mon, 22 Jul 2024 15:21:05 +0200
Subject: [PATCH] Add hostprocess image builds (#1507)

---
 .github/workflows/release.yml | 25 +++++++++++++++++++++++++
 Makefile                      | 14 ++++++++++++--
 README.md                     |  6 ++++++
 3 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9bf3136d1..c1df3ffef 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -31,6 +31,31 @@ jobs:
         with:
           go-version-file: 'go.mod'
 
+      # https://github.com/pl4nty/Windows-Containers/blob/Main/helpful_tools/Install-BuildKit-GitHubActions/workflow.yaml
+      - name: Setup containerd
+        run: |
+          $version = "1.7.17"
+          curl.exe -L https://github.com/containerd/containerd/releases/download/v$version/containerd-$version-windows-amd64.tar.gz -o containerd.tar.gz
+          tar.exe xvf containerd.tar.gz
+          .\bin\containerd.exe --register-service
+          Start-Service containerd
+      - name: Setup BuildKit
+        run: |
+          $version = "v0.13.2"
+          curl.exe -L https://github.com/moby/buildkit/releases/download/$version/buildkit-$version.windows-amd64.tar.gz -o buildkit.tar.gz
+          tar.exe xvf buildkit.tar.gz
+          
+          .\bin\buildkitd.exe --register-service
+          Start-Service buildkitd
+      - name: Setup Docker Buildx
+        run: |
+          $version = "v0.14.1"
+          curl.exe -L https://github.com/docker/buildx/releases/download/$version/buildx-$version.windows-amd64.exe -o $env:ProgramData\Docker\cli-plugins\docker-buildx.exe
+      - uses: docker/setup-buildx-action@v3
+        with:
+          driver: remote
+          endpoint: npipe:////./pipe/buildkitd
+
       - name: Install WiX
         run: dotnet tool install --global wix
 
diff --git a/Makefile b/Makefile
index dd1fa1d5e..7ab9e875e 100644
--- a/Makefile
+++ b/Makefile
@@ -58,10 +58,13 @@ package: crossbuild
 build-image: crossbuild
 	$(DOCKER) build --build-arg=BASE=$(BASE_IMAGE):$(OS) -f Dockerfile -t local/$(DOCKER_IMAGE_NAME):$(VERSION)-$(OS) .
 
+build-hostprocess:
+	$(DOCKER) buildx build --build-arg=BASE=mcr.microsoft.com/oss/kubernetes/windows-host-process-containers-base-image:v1.0.0 -f Dockerfile -t local/$(DOCKER_IMAGE_NAME):$(VERSION)-hostprocess .
+
 sub-build-%:
 	$(MAKE) OS=$* build-image
 
-build-all: $(addprefix sub-build-,$(ALL_OS))
+build-all: $(addprefix sub-build-,$(ALL_OS)) build-hostprocess
 
 push:
 	set -x; \
@@ -76,9 +79,16 @@ push:
 		$(DOCKER) manifest push --purge $${docker_repo}/$(DOCKER_IMAGE_NAME):$(VERSION); \
 	done
 
+# We can't load the image into the local docker store, so we have to build and push it in one go
+push-hostprocess:
+	set -x; \
+	for docker_repo in ${DOCKER_REPO}; do \
+		$(DOCKER) buildx build --push --build-arg=BASE=mcr.microsoft.com/oss/kubernetes/windows-host-process-containers-base-image:v1.0.0 -f Dockerfile -t $${docker_repo}/$(DOCKER_IMAGE_NAME):$(VERSION)-hostprocess  .
+	done
+
 .PHONY: push-all
 push-all: build-all
-	$(MAKE) DOCKER_REPO="$(ALL_DOCKER_REPOS)" push
+	$(MAKE) DOCKER_REPO="$(ALL_DOCKER_REPOS)" push push-hostprocess
 
 # Mandatory target for container description sync action
 .PHONY: docker-repo-name
diff --git a/README.md b/README.md
index ce0f9ead6..4a788aebf 100644
--- a/README.md
+++ b/README.md
@@ -160,6 +160,12 @@ The windows_exporter can be run as a Docker container. The Docker image is avail
 * [GitHub Container Registry](https://github.com/prometheus-community/windows_exporter/pkgs/container/windows-exporter): `ghcr.io/prometheus-community/windows-exporter`
 <!-- * [quay.io Registry](https://quay.io/repository/prometheuscommunity/windows-exporter): `quay.io/prometheuscommunity/windows-exporter` -->
 
+### Tags
+
+The Docker image is tagged with the version of the exporter. The `latest` tag is also available and points to the latest release.
+
+Additionally, a flavor `hostprocess` with `-hostprocess` as suffix is based on the https://github.com/microsoft/windows-host-process-containers-base-image
+which is designed to run as a Windows host process container. The size of that images is smaller than the default one.
 
 ## Kubernetes Implementation