name: CI deps image

# Builds the prebuilt apt .deb bundles that the make-check family (the
# -minimal tags), the interop workflows (the -full tags, a superset), the
# membrowse embedded targets (the -embedded tag - the big ARM cross-toolchain)
# and the linux kernel-module builds (the -linuxkm tag - kernel headers)
# install offline (see .github/actions/install-apt-deps, input
# ghcr-debs-tag). Each bundle holds the .debs for a package list in
# .github/ci-deps/ - every package plus the dependencies not already on the
# matching runner image, so it is tied to that runner rather than being a
# portable, self-contained closure - published to
# ghcr.io/<owner>/wolfssl-ci-debs:<tag>.
#
# Why: the apt mirror times out often enough to break PR CI. Resolving the
# closure ONCE here (on master, where a slow mirror only delays this job and
# is retried hard) and pulling it from ghcr on every PR keeps apt off the PR
# critical path entirely. ghcr storage/bandwidth is free for public images
# and is a separate pool from the 10 GB Actions cache.
#
# ONE-TIME SETUP: after the first successful run, make the package
# `wolfssl-ci-debs` PUBLIC (repo/org > Packages > Package settings >
# Change visibility). Anonymous `docker pull` then works from fork PRs too;
# until then install-apt-deps simply falls back to apt (no breakage).

on:
  schedule:
    # Weekly (Saturday) - the static bundles (-minimal/-full/-embedded).
    # Refreshes them so they track base-image security updates. A mid-week
    # package-list change waits for Saturday (or run this manually via
    # workflow_dispatch); until then the offline install (a single
    # --no-download install of the whole set) fails if any requested package
    # is missing from the bundle, and install-apt-deps falls back to apt.
    - cron: '0 2 * * 6'
    # Daily - the kernel-tracking -linuxkm bundle only. linux-headers-$(uname
    # -r) pins to the runner's running kernel (changes ~monthly); the linuxkm
    # job rebuilds solely when uname -r differs from the published bundle, a
    # cheap no-op otherwise. A mismatch mid-rollout just falls back to apt.
    - cron: '0 3 * * *'
  workflow_dispatch:

concurrency:
  group: ci-deps-image-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read
  packages: write

jobs:
  build:
    name: build ${{ matrix.tag }}
    # Static bundles: weekly cron or manual dispatch. Skip the daily cron,
    # which exists only to refresh the kernel-tracking -linuxkm bundle below.
    if: >-
      github.repository_owner == 'wolfssl' &&
      (github.event_name != 'schedule' || github.event.schedule == '0 2 * * 6')
    strategy:
      fail-fast: false
      matrix:
        include:
          # The .debs must be downloaded on the same Ubuntu version that
          # consumes them, so the runner matches the tag. -minimal is the
          # make-check family's packages (small, pulled on every PR);
          # -full adds the interop workflows' packages (a superset).
          - runner: ubuntu-24.04
            tag: ubuntu-24.04-minimal
          - runner: ubuntu-24.04
            tag: ubuntu-24.04-full
          # membrowse embedded targets' ARM cross-toolchain (~0.5 GB). Its own
          # tag so it does not bloat the -full pull for the interop workflows.
          - runner: ubuntu-24.04
            tag: ubuntu-24.04-embedded
          - runner: ubuntu-22.04
            tag: ubuntu-22.04-minimal
          - runner: ubuntu-22.04
            tag: ubuntu-22.04-full
    runs-on: ${{ matrix.runner }}
    # Backstop only: the download step kills and retries stalled apt connections,
    # but cap the job so a pathological mirror cannot hang a runner. -full
    # normally finishes in a few minutes.
    timeout-minutes: 60
    steps:
      - uses: actions/checkout@v5

      - name: Resolve and download the .deb closure
        shell: bash
        run: |
          set -euo pipefail
          LIST=".github/ci-deps/packages-${{ matrix.tag }}.txt"
          mapfile -t PKGS < <(grep -vE '^[[:space:]]*#|^[[:space:]]*$' "$LIST")
          echo "Packages (${#PKGS[@]}): ${PKGS[*]}"
          export DEBIAN_FRONTEND=noninteractive
          rm -rf debs && mkdir -p debs
          sudo apt-get clean
          # A single stalled mirror connection once hung -full for ~20 min (it
          # normally finishes in a few). retry() only re-runs on a non-zero exit,
          # so a hang never tripped it. Defend in depth: apt drops a stalled
          # connection after 30s and retries it (Acquire timeouts), `timeout`
          # hard-kills a wedged apt-get, then retry() re-runs from scratch.
          APT_OPTS=(-o Acquire::Retries=3 -o Acquire::http::Timeout=30 -o Acquire::https::Timeout=30)
          retry() { local i; for i in 1 2 3 4 5; do "$@" && return 0; sleep $((2**i)); done; "$@"; }
          retry sudo timeout -k 10 120 apt-get "${APT_OPTS[@]}" update -q
          # Download each package's closure independently (requested package +
          # any dependency not already installed) without installing. Per
          # package, not one resolve of the whole list, so one unbundleable
          # package - e.g. a conflict in the big -full union - cannot abort the
          # rest; install-apt-deps falls back to apt for anything missing.
          skipped=0
          for pkg in "${PKGS[@]}"; do
            retry sudo timeout -k 10 300 apt-get "${APT_OPTS[@]}" install -y --download-only "$pkg" \
              || { echo "::warning::could not download $pkg"; skipped=$((skipped+1)); }
          done
          sudo cp /var/cache/apt/archives/*.deb debs/ 2>/dev/null || true
          echo "Bundled $(ls debs/*.deb 2>/dev/null | wc -l) .deb files ($(du -sh debs | cut -f1)); ${skipped} skipped"
          test -n "$(ls debs/*.deb 2>/dev/null)"  # fail if nothing was bundled

      - name: Build bundle image
        shell: bash
        run: |
          # Tiny busybox base so the consumer can `docker create`/`docker cp`
          # the .debs out; the base size is negligible next to the .debs.
          printf 'FROM busybox\nCOPY debs /debs\n' > Dockerfile.debs
          docker build -f Dockerfile.debs -t bundle .

      - name: Log in to ghcr
        shell: bash
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u "${{ github.actor }}" --password-stdin

      - name: Push to ghcr
        shell: bash
        run: |
          set -euo pipefail
          OWNER=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
          IMG="ghcr.io/$OWNER/wolfssl-ci-debs"
          # One mutable tag per bundle variant; each run overwrites it, so the
          # package keeps exactly one version per variant (no dated duplicates).
          docker tag bundle "$IMG:${{ matrix.tag }}"
          docker push "$IMG:${{ matrix.tag }}"
          echo "Pushed $IMG:${{ matrix.tag }}"

  # Kernel-tracking bundle for the linux kernel-module builds (linuxkm.yml and
  # the membrowse linuxkm targets). linux-headers-$(uname -r) pins to the
  # runner's running kernel, so this runs daily but rebuilds only when the
  # kernel changed since the published bundle (the image carries the kernel as
  # a label). A mismatch - e.g. during a gradual runner-image rollout - just
  # makes install-apt-deps fall back to apt.
  linuxkm:
    name: build ubuntu-24.04-linuxkm
    if: github.repository_owner == 'wolfssl'
    runs-on: ubuntu-24.04
    timeout-minutes: 20
    steps:
      - name: Log in to ghcr
        shell: bash
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u "${{ github.actor }}" --password-stdin

      - name: Decide whether the published bundle already matches this kernel
        id: check
        shell: bash
        run: |
          set -uo pipefail
          OWNER=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
          IMG="ghcr.io/$OWNER/wolfssl-ci-debs:ubuntu-24.04-linuxkm"
          K=$(uname -r)
          echo "kernel=$K" >> "$GITHUB_OUTPUT"
          echo "runner kernel: $K"
          have=""
          if docker pull -q "$IMG" >/dev/null 2>&1; then
            have=$(docker inspect --format '{{ index .Config.Labels "kernel" }}' "$IMG" 2>/dev/null || true)
          fi
          echo "published bundle kernel: ${have:-<none>}"
          if [ "$have" = "$K" ]; then
            echo "rebuild=false" >> "$GITHUB_OUTPUT"
            echo "Bundle already current for $K; nothing to do."
          else
            echo "rebuild=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Resolve and download the .deb closure
        if: steps.check.outputs.rebuild == 'true'
        shell: bash
        run: |
          set -euo pipefail
          K="${{ steps.check.outputs.kernel }}"
          # linuxkm.yml installs only the headers; the membrowse linuxkm targets
          # also need the build toolchain. Bundle the union - each consumer
          # installs its own subset offline.
          PKGS=(build-essential autoconf automake libtool "linux-headers-$K")
          echo "Packages: ${PKGS[*]}"
          export DEBIAN_FRONTEND=noninteractive
          rm -rf debs && mkdir -p debs
          sudo apt-get clean
          retry() { local i; for i in 1 2 3 4 5; do "$@" && return 0; sleep $((2**i)); done; "$@"; }
          retry sudo apt-get update -q
          # The whole set is required and this bundle is small, so resolve it as
          # one closure and let any download failure fail the job. We push only
          # on success, so a transient mirror error keeps the last good bundle
          # rather than publishing a partial one - which the kernel-label skip
          # would then pin in place until the kernel next changes (~monthly).
          retry sudo apt-get install -y --download-only "${PKGS[@]}"
          sudo cp /var/cache/apt/archives/*.deb debs/ 2>/dev/null || true
          echo "Bundled $(ls debs/*.deb 2>/dev/null | wc -l) .deb files"
          test -n "$(ls debs/*.deb 2>/dev/null)"  # headers are never preinstalled

      - name: Build and push bundle (labelled with the kernel)
        if: steps.check.outputs.rebuild == 'true'
        shell: bash
        run: |
          set -euo pipefail
          K="${{ steps.check.outputs.kernel }}"
          OWNER=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
          IMG="ghcr.io/$OWNER/wolfssl-ci-debs:ubuntu-24.04-linuxkm"
          printf 'FROM busybox\nCOPY debs /debs\nLABEL kernel=%s\n' "$K" > Dockerfile.debs
          docker build -f Dockerfile.debs -t "$IMG" .
          docker push "$IMG"
          echo "Pushed $IMG (kernel $K)"