Initial commit

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/renovate.json5

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ]
+}

.github/workflows/build.yml

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+---
+name: Build Custom Image
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: '05 10 * * *'  # 10:05am UTC everyday
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**/README.md'
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: "${{ github.event.repository.name }}"  # the name of the image produced by this build, matches repo names
+  IMAGE_DESC: "My Customized Universal Blue Image"
+  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"  # do not edit
+  ARTIFACTHUB_LOGO_URL: "https://avatars.githubusercontent.com/u/120078124?s=200&v=4"  # You should put your own image here so that you get a fancy profile image on https://artifacthub.io/!
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}-${{ inputs.brand_name}}-${{ inputs.stream_name }}
+  cancel-in-progress: true
+
+jobs:
+  build_push:
+    name: Build and push image
+    runs-on: ubuntu-24.04
+
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    steps:
+      # These stage versions are pinned by https://github.com/renovatebot/renovate
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+
+      # This is optional, but if you see that your builds are way too big for the runners, you can enable this by uncommenting the following lines:
+      # - name: Maximize build space
+      #   uses: ublue-os/remove-unwanted-software@517622d6452028f266b7ba4cc9a123b5f58a6b53 # v7
+      #   with:
+      #     remove-codeql: true
+
+      - name: Get current date
+        id: date
+        run: |
+          # 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
+          echo "date=$(date -u +%Y\-%m\-%d\T%H\:%M\:%S\Z)" >> $GITHUB_OUTPUT
+
+      # Image metadata for https://artifacthub.io/ - This is optional but is highly recommended so we all can get a index of all the custom images
+      # The metadata by itself is not going to do anything, you choose if you want your image to be on ArtifactHub or not.
+      - name: Image Metadata
+        uses: docker/metadata-action@369eb591f429131d6889c46b94e711f089e6ca96 # v5
+        id: metadata
+        with:
+          # This generates all the tags for your image, you can add custom tags here too!
+          # By default, it should generate "latest" and "latest.(date here)".
+          tags: |
+            type=raw,value=latest
+            type=raw,value=latest.{{date 'YYYYMMDD'}}
+            type=raw,value={{date 'YYYYMMDD'}}
+            type=sha,enable=${{ github.event_name == 'pull_request' }}
+            type=ref,event=pr
+          labels: |
+            io.artifacthub.package.readme-url=https://raw.githubusercontent.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}/refs/heads/main/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 }}/refs/heads/main/README.md
+            org.opencontainers.image.source=https://github.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}/blob/main/Containerfile
+            org.opencontainers.image.title=${{ env.IMAGE_NAME }}
+            org.opencontainers.image.url=https://github.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+            org.opencontainers.image.vendor=${{ github.repository_owner }}
+            org.opencontainers.image.version=latest
+            io.artifacthub.package.deprecated=false
+            io.artifacthub.package.keywords=bootc,ublue,universal-blue
+            io.artifacthub.package.license=Apache-2.0
+            io.artifacthub.package.logo-url=${{ env.ARTIFACTHUB_LOGO_URL }}
+            io.artifacthub.package.prerelease=false
+            containers.bootc=1
+          sep-tags: " "
+          sep-annotations: " "
+
+      - name: Build Image
+        id: build_image
+        uses: redhat-actions/buildah-build@v2
+        with:
+          containerfiles: |
+            ./Containerfile
+          # Postfix image name with -custom to make it a little more descriptive
+          # Syntax: https://docs.github.com/en/actions/learn-github-actions/expressions#format
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
+          oci: false
+
+      # Rechunk is a script that we use on Universal Blue to make sure there isnt a single huge layer when your image gets published.
+      # This does not make your image faster to download, just provides better resumability and fixes a few errors.
+      # Documentation for Rechunk is provided on their github repository at https://github.com/hhd-dev/rechunk
+      # You can enable it by uncommenting the following lines:
+      # - name: Run Rechunker
+      #   id: rechunk
+      #   uses: hhd-dev/rechunk@f153348d8100c1f504dec435460a0d7baf11a9d2 # v1.1.1
+      #   with:
+      #     rechunk: 'ghcr.io/hhd-dev/rechunk:v1.0.1'
+      #     ref: "localhost/${{ env.IMAGE_NAME }}:${{ env.DEFAULT_TAG }}"
+      #     prev-ref: "${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.DEFAULT_TAG }}"
+      #     skip_compression: true
+      #     version: ${{ env.CENTOS_VERSION }}
+      #     labels: ${{ steps.metadata.outputs.labels }} # Rechunk strips out all the labels during build, this needs to be reapplied here with newline separator
+
+      # This is necessary so that the podman socket can find the rechunked image on its storage
+      # - name: Load in podman and tag
+      #   run: |
+      #     IMAGE=$(podman pull ${{ steps.rechunk.outputs.ref }})
+      #     sudo rm -rf ${{ steps.rechunk.outputs.output }}
+      #     for tag in ${{ steps.metadata.outputs.tags }}; do
+      #       podman tag $IMAGE ${{ env.IMAGE_NAME }}:$tag
+      #     done
+
+      # These `if` statements are so that pull requests for your custom images do not make it publish any packages under your name without you knowing
+      # They also check if the runner is on the default branch so that things like the merge queue (if you enable it), are going to work
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Workaround bug where capital letters in your GitHub username make it impossible to push to GHCR.
+      # https://github.com/macbre/push-to-ghcr/issues/12
+      - name: Lowercase Registry
+        id: registry_case
+        uses: ASzc/change-string-case-action@v6
+        with:
+          string: ${{ env.IMAGE_REGISTRY }}
+
+      - name: Push To GHCR
+        uses: redhat-actions/push-to-registry@5ed88d269cf581ea9ef6dd6806d01562096bee9c # v2
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        id: push
+        env:
+          REGISTRY_USER: ${{ github.actor }}
+          REGISTRY_PASSWORD: ${{ github.token }}
+        with:
+          registry: ${{ steps.registry_case.outputs.lowercase }}
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ steps.metadata.outputs.tags }}
+          username: ${{ env.REGISTRY_USER }}
+          password: ${{ env.REGISTRY_PASSWORD }}
+
+      # This section is optional and only needs to be enabled if you plan on distributing
+      # your project for others to consume. You will need to create a public and private key
+      # using Cosign and save the private key as a repository secret in Github for this workflow
+      # to consume. For more details, review the image signing section of the README.
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da # v3.7.0
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+
+      - name: Sign container image
+        if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        run: |
+          IMAGE_FULL="${{ steps.registry_case.outputs.lowercase }}/${IMAGE_NAME}"
+          for tag in ${{ steps.metadata.outputs.tags }}; do
+            cosign sign -y --key env://COSIGN_PRIVATE_KEY $IMAGE_FULL:$tag
+          done
+        env:
+          TAGS: ${{ steps.push.outputs.digest }}
+          COSIGN_EXPERIMENTAL: false
+          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}

.gitignore

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+cosign.key
+_build_*

Containerfile

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+FROM ghcr.io/ublue-os/silverblue-main:latest
+
+## Other possible base images include:
+# FROM ghcr.io/ublue-os/bazzite:stable
+# FROM ghcr.io/ublue-os/bluefin-nvidia:stable
+# 
+# ... and so on, here are more base images
+# Universal Blue Images: https://github.com/orgs/ublue-os/packages
+# Fedora base image: quay.io/fedora/fedora-bootc:41
+# CentOS base images: quay.io/centos-bootc/centos-bootc:stream10
+
+### MODIFICATIONS
+## make modifications desired in your image and install packages by modifying the build.sh script
+## the following RUN directive does all the things required to run "build.sh" as recommended.
+
+COPY build.sh /tmp/build.sh
+
+RUN mkdir -p /var/lib/alternatives && \
+    /tmp/build.sh && \
+    ostree container commit && \
+    bootc container lint
+