init: first functional homebrew tarball generator

Signed-off-by: Tulip Blossom <tulilirockz@outlook.com>

.github/renovate.json5

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>ublue-os/renovate-config:org-inherited-config"
+  ],
+
+  "regexManagers": [
+    {
+      "fileMatch": ["^Containerfile$"],
+      "matchStrings": [
+        "https://github\\.com/ublue-os/artwork/releases/download/bluefin-v(?<version>[0-9\\-]+)/bluefin-wallpapers\\.tar\\.zstd"
+      ],
+      "datasourceTemplate": "github-releases",
+      "depNameTemplate": "ublue-os/artwork"
+    }
+  ]
+}

.github/workflows/brew-tarball.yml

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+name: Generate Homebrew Tarball and Release
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - ".github/workflows/brew-tarball.yml"
+  schedule:
+    - cron: "0 1 * * TUE" # Every Tuesday at 1am UTC
+
+jobs:
+  create_release:
+    name: Create Release
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      contents: write
+    outputs:
+      tag_date: ${{ steps.date.outputs.tag_date }}
+    steps:
+      - name: Get current date
+        if: github.event_name != 'pull_request'
+        id: date
+        run: |
+          set -x
+          echo "date=$(date -u +%Y\-%m\-%d\ %H\:%M\:%S)" >> $GITHUB_OUTPUT
+          echo "tag_date=$(date -u +%Y\-%m\-%d-%H-%M-%S)" >> $GITHUB_OUTPUT
+
+      - name: Create Release
+        if: github.event_name != 'pull_request'
+        uses: softprops/action-gh-release@6da8fa9354ddfdc4aeace5fc48d7f679b5214090 # v2
+        with:
+          name: Homebrew Tarball (${{ steps.date.outputs.date }})
+          tag_name: "homebrew-${{ steps.date.outputs.tag_date }}"
+          body: |
+            This is a homebrew tarball generated for the [ublue-brew](https://github.com/${{ github.repository }}/blob/${{ github.sha }}/ublue/brew/ublue-brew.spec) package.
+            It exists so that images can have a consistent tarball to base to install homebrew
+          make_latest: true
+
+  push_tarballs:
+    name: Generate Homebrew Tarball and Push to Release
+    runs-on: ${{ matrix.platform == 'amd64' && 'ubuntu-24.04' || 'ubuntu-24.04-arm' }}
+    needs: create_release
+    timeout-minutes: 30
+    permissions:
+      contents: write
+    strategy:
+      matrix:
+        platform: [arm64, amd64]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - name: Setup Just
+        uses: extractions/setup-just@e33e0265a09d6d736e2ee1e0eb685ef1de4669ff # v3
+
+      - name: Generate Homebrew tarball
+        id: generate_tarball
+        run: |
+          set -euox pipefail
+          just=$(which just)
+
+          OUTDIR="./brew-out"
+          SHASUM_DIR="./brew-sum"
+          TARBALL_FILENAME="homebrew-$(arch).tar.zst"
+
+          mkdir -p $OUTDIR
+
+          podman run --rm -it \
+              -v "$OUTDIR:/outdir:Z" \
+              cgr.dev/chainguard/wolfi-base:latest \
+              /bin/sh -c "
+              set -o xtrace
+              apk add curl git zstd posix-libc-utils uutils gnutar grep
+              curl --retry 3 -Lo /tmp/brew-install https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh
+              chmod +x /tmp/brew-install
+              touch /.dockerenv
+              ln -s /bin/bash /usr/bin/bash
+              ls -s /usr/bin/grep /bin/grep
+              env --ignore-environment PATH=/usr/bin:/bin:/usr/sbin:/sbin HOME=/home/linuxbrew NONINTERACTIVE=1 /usr/bin/bash /tmp/brew-install
+              tar --zstd -cvf /outdir/${TARBALL_FILENAME} /home/linuxbrew/.linuxbrew"
+
+          mkdir -p $SHASUM_DIR
+          for spice in 1 256 512 ; do
+            "sha${spice}sum" "$OUTDIR/$TARBALL_FILENAME" | tee "$SHASUM_DIR/homebrew-$(arch).sha${spice}"
+          done
+
+          echo "outdir=$(realpath $OUTDIR)" >> "$GITHUB_OUTPUT"
+          echo "tarball_file=$(realpath $OUTDIR)/$TARBALL_FILENAME" >> "$GITHUB_OUTPUT"
+          echo "shasum_dir=$(realpath $SHASUM_DIR)" >> "$GITHUB_OUTPUT"
+
+      - name: Upload to Job Artifacts
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        with:
+          name: brew-tarball-${{ matrix.platform }}
+          if-no-files-found: error
+          path: |
+            ${{ steps.generate_tarball.outputs.tarball_file }}
+            ${{ steps.generate_tarball.outputs.shasum_dir }}/*
+
+      - name: Upload Release Artifact
+        if: github.event_name != 'pull_request'
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+          TAG_DATE: ${{ needs.create_release.outputs.tag_date }}
+          TARBALL_FILE: ${{ steps.generate_tarball.outputs.tarball_file }}
+          SHASUM_DIR: ${{ steps.generate_tarball.outputs.shasum_dir }}
+        run: |
+          gh release upload --clobber \
+            "homebrew-${TAG_DATE}" \
+            "${TARBALL_FILE}" \
+            "${SHASUM_DIR}"/*

.github/workflows/build.yml

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+name: Build container image
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: "0 1 * * SUN"
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "**/README.md"
+  workflow_dispatch:
+
+env:
+  IMAGE_DESC: "OCI image for Homebrew"
+  IMAGE_KEYWORDS: "homebrew"
+  IMAGE_LOGO_URL: "https://avatars.githubusercontent.com/u/136393846?s=200&v=4"
+  IMAGE_NAME: "${{ github.event.repository.name }}"
+  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"
+  DEFAULT_TAG: "latest"
+
+jobs:
+  build_push:
+    name: Build and push image
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+    timeout-minutes: 60
+    strategy:
+      fail-fast: true
+      matrix:
+        platform: ["amd64", "arm64"]
+    runs-on: ${{ matrix.platform == 'amd64' && 'ubuntu-24.04' || 'ubuntu-24.04-arm' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+
+      - name: Build image
+        run: podman build -t "${IMAGE_NAME}:${DEFAULT_TAG}" -f ./Containerfile .
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          LOGIN_USER: ${{ github.actor }}
+        run: |
+          echo "${GITHUB_TOKEN}" | podman login -u "${LOGIN_USER}" --password-stdin "ghcr.io"
+          echo "${GITHUB_TOKEN}" | docker login -u "${LOGIN_USER}" --password-stdin "ghcr.io"
+
+      - name: Push to GHCR
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        id: push
+        env:
+          IMAGE_REGISTRY: ${{ env.IMAGE_REGISTRY }}
+          IMAGE_NAME: ${{ env.IMAGE_NAME }}
+          IMAGE_DIGEST: ${{ steps.load.outputs.digest }}
+          PLATFORM: ${{ matrix.platform }}
+          MAX_RETRIES: 3
+        run: |
+          set -x
+
+          for i in $(seq "${MAX_RETRIES}"); do
+            podman push --digestfile=/tmp/digestfile "localhost/${IMAGE_NAME}:${DEFAULT_TAG}" "${IMAGE_REGISTRY}/${IMAGE_NAME}:${DEFAULT_TAG}-${PLATFORM}" && break || sleep $((5 * i));
+          done
+          echo "remote_image_digest=$(< /tmp/digestfile)" | tee "${GITHUB_OUTPUT}"
+
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+
+      - name: Sign Image
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        env:
+          REMOTE_IMAGE_DIGEST: ${{ steps.push.outputs.remote_image_digest }}
+          COSIGN_EXPERIMENTAL: false
+          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}
+        run: cosign sign -y --key env://COSIGN_PRIVATE_KEY "${IMAGE_REGISTRY}/${IMAGE_NAME}@${REMOTE_IMAGE_DIGEST}"
+
+      - name: Create Job Outputs
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        env:
+          IMAGE_NAME: ${{ env.IMAGE_NAME }}
+          PLATFORM: ${{ matrix.platform }}
+          DIGEST: ${{ steps.push.outputs.remote_image_digest }}
+        run: |
+          set -x
+          mkdir -p /tmp/outputs/digests
+          echo "${DIGEST}" | tee "/tmp/outputs/digests/${IMAGE_NAME}-${PLATFORM}.txt"
+
+      - name: Upload Output Artifacts
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        with:
+          name: ${{ env.IMAGE_NAME }}-${{ matrix.platform }}
+          retention-days: 1
+          if-no-files-found: error
+          path: |
+            /tmp/outputs/digests/*.txt
+
+  manifest:
+    name: Create Manifest
+    runs-on: ubuntu-latest
+    if: always()
+    needs:
+      - build_push
+    container:
+      image: docker.io/library/alpine:latest
+      options: --privileged --security-opt seccomp=unconfined
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+    steps:
+      - name: Install dependencies
+        run: apk add bash coreutils curl docker findutils fuse-overlayfs git grep jq podman sed
+
+      # Necessary until bootc supports Cosign v3
+      - name: Install old cosign
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: |
+          # Thank you Bri! :3 @b-
+          curl --retry 3 -H "Authorization: Bearer ${GITHUB_TOKEN}" -fsSLo "/usr/bin/cosign" "https://github.com/sigstore/cosign/releases/download/v2.6.1/cosign-linux-amd64"
+          chmod +x /usr/bin/cosign
+
+      - name: Exit on failure
+        shell: bash
+        env:
+          JOBS: ${{ toJson(needs) }}
+        run: |
+          for i in $(jq -r 'to_entries[] | .value.result' <<< "${JOBS}"); do
+            if [ "$i" != "success" ] && [ "$i" != "skipped" ]; then
+              echo "Status check not okay!"
+              exit 1
+            fi
+          done
+
+        # This generates a timestamp like what is defined on the ArtifactHub documentation
+        # E.G: 2022-02-08T15:38:15Z'
+        # https://artifacthub.io/docs/topics/repositories/container-images/
+        # https://linux.die.net/man/1/date
+      - name: Get current date
+        id: date
+        run: echo "date=$(date -u +%Y\-%m\-%d\T%H\:%M\:%S\Z)" | tee "${GITHUB_OUTPUT}"
+
+      - name: Image Metadata
+        uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5
+        id: metadata
+        with:
+          tags: |
+            type=raw,value=${{ env.DEFAULT_TAG }}
+            type=raw,value=${{ env.DEFAULT_TAG }}.{{date 'YYYYMMDD'}}
+            type=raw,value={{date 'YYYYMMDD'}}
+            type=ref,event=pr
+            type=sha,enable=${{ github.event_name == 'pull_request' }}
+          labels: |
+            containers.bootc=1
+            io.artifacthub.package.deprecated=false
+            io.artifacthub.package.keywords=${{ env.IMAGE_KEYWORDS }}
+            io.artifacthub.package.license=Apache-2.0
+            io.artifacthub.package.logo-url=${{ env.IMAGE_LOGO_URL }}
+            io.artifacthub.package.prerelease=false
+            io.artifacthub.package.readme-url=https://raw.githubusercontent.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}/${{ github.sha }}/README.md
+            org.opencontainers.image.created=${{ steps.date.outputs.date }}
+            org.opencontainers.image.description=${{ env.IMAGE_DESC }}
+            org.opencontainers.image.documentation=https://raw.githubusercontent.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}/${{ github.sha }}/README.md
+            org.opencontainers.image.source=https://github.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}/blob/${{ github.sha }}/Containerfile
+            org.opencontainers.image.title=${{ env.IMAGE_NAME }}
+            org.opencontainers.image.url=https://github.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}/tree/${{ github.sha }}
+            org.opencontainers.image.vendor=${{ github.repository_owner }}
+            org.opencontainers.image.version=${{ env.DEFAULT_TAG }}.{{date 'YYYYMMDD'}}
+
+      - name: Fetch Build Outputs
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
+        with:
+          pattern: ${{ env.IMAGE_NAME }}-*
+          merge-multiple: true
+          path: /tmp/artifacts
+
+      - name: Load Outputs
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        shell: bash
+        id: load-outputs
+        run: |
+          set -x
+          OUTCSV="$(mktemp)"
+          for digest_file in /tmp/artifacts/*.txt; do
+            # Extract the platform from the file name
+            PLATFORM="$(basename "${digest_file}" ".txt" | sed 's/.*-//g')"
+            IMAGE_NAME="$(basename "${digest_file}" ".txt" | grep -Po ".*-" | sed 's/-$//')"
+            DIGEST="$(< "${digest_file}")"
+            echo "${PLATFORM},${IMAGE_NAME},${DIGEST}" | tee -a "${OUTCSV}"
+          done
+          echo "OUTPUT_CSV=$(base32 -w 0 < "${OUTCSV}")" | tee -a "${GITHUB_OUTPUT}"
+
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        env:
+          REGISTRY: ghcr.io
+        run: |
+          echo "${{ secrets.GITHUB_TOKEN }}" | podman login -u "${{ github.actor }}" --password-stdin "${REGISTRY}"
+          echo "${{ secrets.GITHUB_TOKEN }}" | docker login -u "${{ github.actor }}" --password-stdin "${REGISTRY}"
+
+      - name: Publish manifest with unified architecture and sign
+        shell: bash
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        env:
+          COSIGN_EXPERIMENTAL: false
+          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}
+          LABELS: ${{ steps.metadata.outputs.labels }}
+          OUTPUT_CSV: ${{ steps.load-outputs.outputs.OUTPUT_CSV }}
+          TAGS: ${{ steps.metadata.outputs.tags }}
+        run: |
+          set -x
+
+          OUTPUT_CSV_FILE="$(mktemp)"
+          echo "${OUTPUT_CSV}" | base32 -d | tee "${OUTPUT_CSV_FILE}"
+
+          # This is insanely dumb, please PR if you have a better solution ~ @tulilirockz :3c
+          IMAGES=$(cat "${OUTPUT_CSV_FILE}" | while IFS=$'\n' read -r ENTRY ; do echo "${ENTRY}" | cut -d, -f2 ; done | sort | uniq | tr "\n" " " | sed 's/.$//')
+          for TARGET_IMAGE in ${IMAGES} ; do
+            TARGET_MANIFEST="${IMAGE_REGISTRY}/${TARGET_IMAGE}"
+            podman manifest create "${TARGET_MANIFEST}"
+
+            PLATFORMS=$(grep -F -e "${IMAGE}" "${OUTPUT_CSV_FILE}" | while IFS=$'\n' read -r ENTRY ; do echo "${ENTRY}" | cut -d, -f1 ; done | sort | uniq | tr "\n" " " | sed 's/.$//')
+            for TARGET_PLATFORM in ${PLATFORMS} ; do
+              TARGET_DIGEST="$(grep -F -e ",${TARGET_IMAGE}," "${OUTPUT_CSV_FILE}" | grep -F -e "${TARGET_PLATFORM}" | cut -d, -f3 | tr -d "\n")"
+              podman manifest add "${TARGET_MANIFEST}" "${TARGET_MANIFEST}@${TARGET_DIGEST}" --arch "${TARGET_PLATFORM}"
+            done
+
+            while IFS= read -r LABEL; do
+              podman manifest annotate --index --annotation "${LABEL}" "${TARGET_MANIFEST}"
+            done <<< "${LABELS}"
+
+            while IFS= read -r TAG; do
+              podman manifest push --all=false --digestfile=/tmp/digestfile "${TARGET_MANIFEST}" "${TARGET_MANIFEST}:${TAG}"
+            done <<< "${TAGS}"
+
+            cosign sign -y --key env://COSIGN_PRIVATE_KEY "${TARGET_MANIFEST}@$(< /tmp/digestfile)"
+          done

Containerfile

@@ -0,0 +1,7 @@
+FROM docker.io/library/alpine:latest AS build
+
+RUN exit 1
+
+FROM scratch AS ctx
+COPY /system_files/shared /system_files/shared/
+COPY --from=build /out/homebrew.tar.zstd /system_files/usr/share/homebrew.tar.zstd

Justfile

@@ -0,0 +1,2 @@
+build:
+    podman build -t localhost/bluefin-brew:latest -f ./Containerfile .

LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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+
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+
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README.md

@@ -0,0 +1,6 @@
+# brew
+
+Repository for generating Homebrew tarballs for redistribution on image-based systems via an OCI image
+
+This includes general settings you'd want to use when using homebrew on a `bootc` system, including a tarball and services for setting it up
+

cosign.pub

@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEqMA/DNasRR+uWtCi0jcLQePscPlm
+EB96KdUB9r/drOGJvcI+p+HEcE20ji/gSiKzHCmKO3hUEHCUMNmg0THyLA==
+-----END PUBLIC KEY-----