Harden CI workflows: reliability tests, least-privilege, build cache

Reliability (catch a bad image revision before prod):
- Smoke-test the exact pushed digest in update-image-on-push.yml BEFORE the
  merge job tags it 'latest' (previously the prod artifact was never run).
- Assert the p2pool banner reports the pinned P2POOL_BRANCH tag, and verify
  the container starts and stays up, instead of just sleeping 30s.

Hardening:
- Least-privilege 'permissions:' blocks (default contents: read; packages:
  write only on push/merge jobs; repo default token is currently write-all).
- Concurrency groups (cancel superseded PR builds; serialize prod pushes).
- persist-credentials: false on checkout; timeout-minutes on jobs.

Build cache:
- cache-to registry buildcache (mode=max, per-arch); read buildcache + latest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.github/dependabot.yml

@@ -1,11 +0,0 @@
-version: 2
-updates:
-  # Maintain dependencies for GitHub Actions
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
-    groups:
-      dependency-updates:
-        patterns:
-          - "*"

.github/renovate.json

@@ -0,0 +1,24 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    "docker:enableMajor",
+    "mergeConfidence:all-badges",
+    ":disableRateLimiting",
+    ":semanticCommits"
+  ],
+  "rebaseWhen": "conflicted",
+  "customManagers": [
+    {
+      "customType": "regex",
+      "managerFilePatterns": [
+        "/(^|/)Dockerfile$/"
+      ],
+      "matchStrings": [
+        "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?\\sARG .*?_VERSION=(?<currentValue>.*)(\\sARG .*?_CHECKSUM=(?<currentDigest>.*))?\\s",
+        "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?\\sARG .*?_BRANCH=(?<currentValue>.*)(\\sARG .*?_COMMIT_HASH=(?<currentDigest>.*))?\\s"
+      ],
+      "versioningTemplate": "{{#if versioning}}{{versioning}}{{/if}}"
+    }
+  ]
+}

.github/workflows/build-image-on-push.yml

@@ -11,12 +11,25 @@ on:
     - 'Dockerfile'
   workflow_dispatch:
 
+# Least-privilege default token (this workflow only reads the repo and pulls cache)
+permissions:
+  contents: read
+
+# Cancel superseded runs for the same ref to save CI minutes
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   GHCR_REPO: ghcr.io/${{ github.repository_owner }}/p2pool
 
 jobs:
   rebuild-container:
     name: "Build image with cache"
+    timeout-minutes: 60
+    permissions:
+      contents: read
+      packages: read
     strategy:
       fail-fast: false
       matrix:
@@ -35,26 +48,39 @@ jobs:
         run: |
           echo "PLATFORM=linux/amd64" >> $GITHUB_ENV
           echo "DIGEST_NAME=amd64" >> $GITHUB_ENV
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3.11.1
-      -
-        name: Checkout repository
-        uses: actions/checkout@v5
-      -
-        name: Test build of image
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4.1.0
+      - name: Checkout repository
+        uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+      - name: Test build of image
         id: build
-        uses: docker/build-push-action@v6.18.0
+        uses: docker/build-push-action@v7.2.0
         with:
           push: false
           load: true
           platforms: ${{ env.PLATFORM }}
           tags: p2pool:testing
-          cache-from: type=registry,ref=${{ env.GHCR_REPO }}:latest
-      - 
-        name: Test-run image
+          cache-from: |
+            type=registry,ref=${{ env.GHCR_REPO }}:buildcache-${{ env.DIGEST_NAME }}
+            type=registry,ref=${{ env.GHCR_REPO }}:latest
+      - name: Verify reported version matches the pinned p2pool tag
         run: |
-          docker run --rm p2pool:testing --wallet 468ydghFfthE3UTc53eF5MP9UyrMcUiAHP5kizVYJsej5XGaXBoAAEzUHCcUF7t3E3RrYAX8Rs1ujhBdcvMpZSbH8qkb55R &
-          PID=$!
-          sleep 30
-          kill -SIGINT $PID # this will return a non-zero exit code if the container dies early on
+          set -euo pipefail
+          EXPECTED="$(awk -F= '/^ARG P2POOL_BRANCH=/{print $2; exit}' Dockerfile)"
+          echo "Expecting p2pool to report: ${EXPECTED}"
+          OUT="$(docker run --rm p2pool:testing --help 2>&1 || true)"
+          echo "${OUT}" | head -1
+          echo "${OUT}" | grep -q "${EXPECTED}" \
+            || { echo "::error::p2pool banner does not contain expected tag ${EXPECTED}"; exit 1; }
+      - name: Verify the container starts and stays up
+        run: |
+          set -uo pipefail
+          CID="$(docker run -d p2pool:testing --wallet 468ydghFfthE3UTc53eF5MP9UyrMcUiAHP5kizVYJsej5XGaXBoAAEzUHCcUF7t3E3RrYAX8Rs1ujhBdcvMpZSbH8qkb55R)"
+          sleep 20
+          if [ "$(docker inspect -f '{{.State.Running}}' "$CID" 2>/dev/null || echo false)" != "true" ]; then
+            echo "::error::container exited early"; docker logs "$CID" 2>&1 || true
+            docker rm -f "$CID" >/dev/null 2>&1 || true; exit 1
+          fi
+          docker rm -f "$CID" >/dev/null 2>&1 || true

.github/workflows/update-image-on-push.yml

@@ -8,12 +8,26 @@ on:
     - 'Dockerfile'
   workflow_dispatch:
 
+# Least-privilege default; jobs that push opt into packages: write below
+permissions:
+  contents: read
+
+# Never run two prod pushes for the same ref concurrently (avoid racing the
+# manifest/`latest` tag); do not cancel an in-flight push.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
 env:
   GHCR_REPO: ghcr.io/${{ github.repository_owner }}/p2pool
 
 jobs:
   build:
     name: "Build container for multiple architectures and push by digest"
+    timeout-minutes: 60
+    permissions:
+      contents: read
+      packages: write
     strategy:
       fail-fast: false
       matrix:
@@ -34,32 +48,57 @@ jobs:
           echo "DIGEST_NAME=amd64" >> $GITHUB_ENV
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ env.GHCR_REPO }}
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3.11.1
-      -
-        name: Login to GitHub Container Registry
-        uses: docker/login-action@v3.6.0
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4.1.0
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v4.2.0
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      -
-        name: Checkout repository
-        uses: actions/checkout@v5
-      -
-        name: Build and and push by digest
-        uses: docker/build-push-action@v6.18.0
+      - name: Checkout repository
+        uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+      - name: Build and push by digest
+        uses: docker/build-push-action@v7.2.0
         id: build
         with:
           outputs: type=image,"name=${{ env.GHCR_REPO }}",push-by-digest=true,name-canonical=true,push=true
           platforms: ${{ env.PLATFORM }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=registry,ref=${{ env.GHCR_REPO }}:latest
+          cache-from: |
+            type=registry,ref=${{ env.GHCR_REPO }}:buildcache-${{ env.DIGEST_NAME }}
+            type=registry,ref=${{ env.GHCR_REPO }}:latest
+          cache-to: type=registry,ref=${{ env.GHCR_REPO }}:buildcache-${{ env.DIGEST_NAME }},mode=max
+
+      # Smoke-test the exact artifact that was just pushed, BEFORE the merge job
+      # tags it `latest`. If this fails, the merge job (needs: build) never runs.
+      - name: Verify pushed image reports the pinned p2pool tag
+        run: |
+          set -euo pipefail
+          EXPECTED="$(awk -F= '/^ARG P2POOL_BRANCH=/{print $2; exit}' Dockerfile)"
+          REF="${GHCR_REPO}@${{ steps.build.outputs.digest }}"
+          echo "Expecting ${EXPECTED} from ${REF}"
+          OUT="$(docker run --rm "${REF}" --help 2>&1 || true)"
+          echo "${OUT}" | head -1
+          echo "${OUT}" | grep -q "${EXPECTED}" \
+            || { echo "::error::pushed image banner does not contain expected tag ${EXPECTED}"; exit 1; }
+      - name: Verify pushed image starts and stays up
+        run: |
+          set -uo pipefail
+          REF="${GHCR_REPO}@${{ steps.build.outputs.digest }}"
+          CID="$(docker run -d "${REF}" --wallet 468ydghFfthE3UTc53eF5MP9UyrMcUiAHP5kizVYJsej5XGaXBoAAEzUHCcUF7t3E3RrYAX8Rs1ujhBdcvMpZSbH8qkb55R)"
+          sleep 20
+          if [ "$(docker inspect -f '{{.State.Running}}' "$CID" 2>/dev/null || echo false)" != "true" ]; then
+            echo "::error::pushed image exited early"; docker logs "$CID" 2>&1 || true
+            docker rm -f "$CID" >/dev/null 2>&1 || true; exit 1
+          fi
+          docker rm -f "$CID" >/dev/null 2>&1 || true
 
       - name: Export digest
         run: |
@@ -68,7 +107,7 @@ jobs:
           touch "${{ runner.temp }}/digests/${digest#sha256:}"
 
       - name: Upload digest
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: digests-${{ env.DIGEST_NAME }}
           path: ${{ runner.temp }}/digests/*
@@ -76,36 +115,43 @@ jobs:
           retention-days: 1
 
   merge:
+    name: "Merge digests and push with proper tags"
+    timeout-minutes: 15
     runs-on: ubuntu-latest
     needs:
       - build
+    permissions:
+      contents: read
+      packages: write
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v8
         with:
           path: ${{ runner.temp }}/digests
           pattern: digests-*
           merge-multiple: true
 
       - name: Login to GHCR
-        uses: docker/login-action@v3.6.0
+        uses: docker/login-action@v4.2.0
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3.11.1
+        uses: docker/setup-buildx-action@v4.1.0
 
       - name: Checkout repository
-        uses: actions/checkout@v5
-      
+        uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+
       - name: Get p2pool release tag
         run: echo P2POOL_TAG="$(awk -F '=' '/P2POOL_BRANCH=/ {print $2}' Dockerfile)" >> $GITHUB_ENV
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ env.GHCR_REPO }}

Dockerfile

@@ -1,7 +1,8 @@
-ARG P2POOL_BRANCH=v4.11
+# renovate: datasource=github-releases depName=SChernykh/p2pool
+ARG P2POOL_BRANCH=v4.17
 
-# Select latest Ubuntu LTS for the build image base
-FROM ubuntu:latest as build
+# Pin to the latest Ubuntu LTS for the build image base (kept current by Renovate)
+FROM ubuntu:26.04 AS build
 LABEL author="sethforprivacy@protonmail.com" \
       maintainer="sethforprivacy@protonmail.com"
 
@@ -16,28 +17,30 @@ RUN apt-get update \
 
 ENV CFLAGS='-fPIC'
 ENV CXXFLAGS='-fPIC'
-ENV USE_SINGLE_BUILDDIR 1
-ENV BOOST_DEBUG         1
+ENV USE_SINGLE_BUILDDIR=1
+ENV BOOST_DEBUG=1
 
 # Switch to p2pool source directory
 WORKDIR /p2pool
 
 # Git pull p2pool source at specified tag/branch
 ARG P2POOL_BRANCH
-RUN git clone --recursive --branch ${P2POOL_BRANCH} https://github.com/SChernykh/p2pool .
+RUN git clone --recursive --depth 1 --shallow-submodules --branch ${P2POOL_BRANCH} https://github.com/SChernykh/p2pool .
 
 # Make static p2pool binary
 ARG NPROC
 RUN test -z "$NPROC" && nproc > /nproc || echo -n "$NPROC" > /nproc && mkdir build && cd build && cmake .. && make -j"$(cat /nproc)"
 
-# Select latest Ubuntu LTS for the image base
-FROM ubuntu:latest
+# Pin to the latest Ubuntu LTS for the image base (kept current by Renovate)
+FROM ubuntu:26.04
 
-# Install remaining dependencies
+# Install only the runtime shared libraries that the p2pool binary links against
+# (runtime equivalents of the build-stage -dev packages, verified via ldd on the
+# built binary against the pinned Ubuntu 24.04 base)
 RUN apt-get update \
     && apt-get upgrade -y \
-    && apt-get install --no-install-recommends -y libuv1-dev libzmq3-dev libsodium-dev \
-    libpgm-dev libnorm-dev libgss-dev libcurl4-openssl-dev libidn2-0-dev \
+    && apt-get install --no-install-recommends -y libuv1t64 libzmq5 libsodium23 \
+    libpgm-5.3-0t64 libnorm1t64 libgssapi-krb5-2 libcurl4t64 libidn2-0 \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 Seth Simmons (@sethsimmons)
+Copyright (c) 2021 Seth For Privacy (@sethforprivacy)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -3,8 +3,8 @@ A simple and straightforward Dockerized [p2pool](https://github.com/SChernykh/p2
 
 ## Actions
 
-[![Daily Update Rebuild](https://github.com/sethsimmons/p2pool-docker//actions/workflows/update-daily.yml/badge.svg)](https://github.com/sethsimmons/p2pool-docker/actions/workflows/update-daily.yml)  
-[![Weekly Update Rebuild](https://github.com/sethsimmons/p2pool-docker//actions/workflows/update-base-image.yml/badge.svg)](https://github.com/sethsimmons/p2pool-docker/actions/workflows/update-base-image.yml)  
+[![Daily Update Rebuild](https://github.com/sethforprivacy/p2pool-docker//actions/workflows/update-daily.yml/badge.svg)](https://github.com/sethforprivacy/p2pool-docker/actions/workflows/update-daily.yml)  
+[![Weekly Update Rebuild](https://github.com/sethforprivacy/p2pool-docker//actions/workflows/update-base-image.yml/badge.svg)](https://github.com/sethforprivacy/p2pool-docker/actions/workflows/update-base-image.yml)  
 
 # Docker Hub
 This repo is used to build the images available here on GHCR.