From b60a31579e873f655c01f1d79ff648a29165538c Mon Sep 17 00:00:00 2001
From: Jakob Borg <jakob@kastelo.net>
Date: Thu, 27 Jun 2024 08:27:36 +0200
Subject: [PATCH] build: build & publish with ko

---
 .github/workflows/build.yml | 70 +++++++++----------------------------
 .ko.yaml                    | 10 ++++++
 Dockerfile                  | 34 ------------------
 3 files changed, 27 insertions(+), 87 deletions(-)
 create mode 100644 .ko.yaml
 delete mode 100644 Dockerfile

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 989418b..4084187 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,65 +2,29 @@ name: build-containers
 on:
   push:
     branches:
-      - master
+      - main
 jobs:
-  vultr-exporter:
+  build-publish:
     name: updown-exporter
     runs-on: ubuntu-latest
-    env:
-      REPO: dazwilkin/updown-exporter
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Setup
-        uses: docker/setup-buildx-action@v3
-      - name: Login
-        uses: docker/login-action@v3
+
+      - uses: actions/setup-go@v5
         with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GHCR }}
-      - name: Get kernel version
-        run: echo "VERSION=$(uname --kernel-release)" >> ${GITHUB_ENV}
-      - name: Exporter
-        uses: docker/build-push-action@v5
+          go-version: stable
+
+      - uses: ko-build/setup-ko@v0.6
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v2
         with:
-          context: .
-          file: ./Dockerfile
-          build-args: |
-            TOKEN=${{ secrets.GHCR }}
-            VERSION=${{ env.VERSION }}
-            COMMIT=${{ github.sha }}
-          tags: ghcr.io/${{ env.REPO }}:${{ github.sha }}
-          push: true
-      # - name: Cosign installer
-      #   uses: sigstore/cosign-installer@main
-      # - name: Write signing key to disk (only needed for `cosign sign --key`)
-      #   run: echo "${{ secrets.SIGNING }}" > ./cosign.key
-      # - name: Sign container image
-      #   run: |
-      #     cosign sign \
-      #     --key=./cosign.key \
-      #     --annotations="repo=${{ github.repository }}" \
-      #     --annotations="workflow=${{ github.workflow }}" \
-      #     --annotations="commit=${{ github.sha }}" \
-      #     --annotations="version=${{ env.VERSION }}" \
-      #     ghcr.io/${{ env.REPO }}:${{ github.sha }}
-      #   env:
-      #     COSIGN_PASSWORD: ""          
-      - name: Revise occurrences of the image
-        run: |
-          git config --local user.email "action@github.com"
-          git config --local user.name "GitHub Actions"
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
-          for FILENAME in "./README.md"
-          do
-            echo "Replacing: ${REPO}"
-            sed \
-            --in-place \
-            "s|${{ env.REPO }}:[0-9a-f]\{40\}|${{ env.REPO }}:${{ github.sha }}|g" \
-            ${FILENAME}
-            git add ${FILENAME}
-          done
-          git commit --message "GitHub Actions update image references"
-          git push origin master
\ No newline at end of file
+      - run: |
+          ko build --sbom=none --bare .
+        env:
+          KO_DOCKER_REPO: ghcr.io/${GITHUB_REPOSITORY}
diff --git a/.ko.yaml b/.ko.yaml
new file mode 100644
index 0000000..b83b472
--- /dev/null
+++ b/.ko.yaml
@@ -0,0 +1,10 @@
+builds:
+- id: updown-exporter
+  main: .
+  ldflags:
+  - -s -w
+  - -extldflags "-static"
+
+defaultPlatforms:
+- linux/arm64
+- linux/amd64
diff --git a/Dockerfile b/Dockerfile
deleted file mode 100644
index 89c990d..0000000
--- a/Dockerfile
+++ /dev/null
@@ -1,34 +0,0 @@
-ARG GOLANG_VERSION=1.21
-
-FROM docker.io/golang:${GOLANG_VERSION} as build
-
-WORKDIR /updown-exporter
-
-ARG COMMIT=""
-ARG VERSION=""
-
-COPY go.mod go.mod
-COPY go.sum go.sum
-
-RUN go mod download
-
-COPY main.go .
-COPY collector collector
-COPY updown updown
-
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
-    go build \
-    -ldflags "-X main.OSVersion=${VERSION} -X main.GitCommit=${COMMIT}" \
-    -a -installsuffix cgo \
-    -o /bin/exporter \
-    .
-
-
-FROM gcr.io/distroless/static
-
-LABEL org.opencontainers.image.source https://github.com/DazWilkin/updown-exporter
-
-COPY --from=build /bin/exporter /
-
-ENTRYPOINT ["/exporter"]
-CMD ["--entrypoint=0.0.0.0:8080","--path=/metrics"]
\ No newline at end of file