Dockerfile: add or document an alpine setup

.github/workflows/containers.yml

@@ -17,6 +17,10 @@ on:
     - cron: "30 2 * * 1"
   workflow_dispatch:
     inputs:
+      distros:
+        description: "Distribution to use as the base docker image (debian or alpine or both)"
+        default: "debian alpine"
+        required: false
       ref:
         description: "Tag or branch to deploy (empty for main)"
         default: "main"
@@ -100,6 +104,7 @@ jobs:
         id: find_targets
         run: |
           TARGET_FILTER="${{ github.event.inputs.target }}"
+          DISTROS="$(${{ github.event.inputs.distros != '' }} && echo '${{github.event.inputs.distros}}' || echo 'debian alpine')"
 
           # imagebuilders & rootfs
           JSON_IB='['
@@ -108,26 +113,32 @@ jobs:
           JSON_ROOTFS='['
           FIRST_ROOTFS=1
 
-          while read -r line;
-          do
-            TARGET=$(echo "$line" | cut -d " " -f 1)
-            ARCH=$(echo "$line" | cut -d " " -f 2)
+          for DISTRO in $DISTROS; do
+
+            while read -r line;
+            do
+              TARGET=$(echo "$line" | cut -d " " -f 1)
+              ARCH=$(echo "$line" | cut -d " " -f 2)
 
-            [[ $FIRST_IB -ne 1 ]] && JSON_IB="$JSON_IB"','
-            FIRST_IB=0
+              [[ $FIRST_IB -ne 1 ]] && JSON_IB="$JSON_IB"','
+              FIRST_IB=0
 
-            JSON_IB="$JSON_IB"'{"target":"'"$TARGET"'"}'
+              JSON_IB="$JSON_IB"'{"distro": "'"$DISTRO"'", "target":"'"$TARGET"'"}'
 
-            case "$TARGET" in
-              x86/*|arm*|malta/be|mvebu/cortexa9)
-                [[ $FIRST_ROOTFS -ne 1 ]] && JSON_ROOTFS="$JSON_ROOTFS"','
-                FIRST_ROOTFS=0
+              if [ $DISTRO == $(echo "${DISTROS[0]%% *}") ]; then
+                case "$TARGET" in
+                  x86/*|arm*|malta/be|mvebu/cortexa9)
+                    [[ $FIRST_ROOTFS -ne 1 ]] && JSON_ROOTFS="$JSON_ROOTFS"','
+                    FIRST_ROOTFS=0
 
-                JSON_ROOTFS="$JSON_ROOTFS"'{"target":"'"$TARGET"'","arch":"'"$ARCH"'"}'
-              ;;
-            esac
+                    JSON_ROOTFS="$JSON_ROOTFS"'{"target":"'"$TARGET"'","arch":"'"$ARCH"'"}'
+                  ;;
+                esac
+              fi
 
-          done <<< $(perl ./scripts/dump-target-info.pl targets 2>/dev/null | ([[ -n "$TARGET_FILTER" ]] && grep -w "$TARGET_FILTER" || cat))
+            done <<< $(perl ./scripts/dump-target-info.pl targets 2>/dev/null | ([[ -n "$TARGET_FILTER" ]] && grep -w "$TARGET_FILTER" || cat))
+
+          done
 
           JSON_IB='{"include":'"$JSON_IB"']}'
           echo -e "\n---- imagebuilders ----\n"
@@ -146,23 +157,27 @@ jobs:
           JSON='['
           FIRST=1
 
-          while read -r line;
-          do
-            TARGET=$(echo "$line" | cut -d " " -f 1)
-            ARCH=$(echo "$line" | cut -d " " -f 2)
-            TARGET_TAG="${TARGET//\//-}"
+          for DISTRO in $DISTROS; do
+
+            while read -r line;
+            do
+              TARGET=$(echo "$line" | cut -d " " -f 1)
+              ARCH=$(echo "$line" | cut -d " " -f 2)
+              TARGET_TAG="${TARGET//\//-}"
 
-            TAGS="$TARGET_TAG"
-            if [ -z "${ARCH_SEEN[$ARCH]+x}" ]; then
-              TAGS="$TARGET_TAG\n$ARCH"
-              ARCH_SEEN[$ARCH]=1
-            fi
+              TAGS="$TARGET_TAG"
+              if [ -z "${ARCH_SEEN[$ARCH]+x}" ]; then
+                TAGS="$TARGET_TAG\n$ARCH"
+                ARCH_SEEN[$ARCH]=1
+              fi
 
-            [[ $FIRST -ne 1 ]] && JSON="$JSON"','
-            FIRST=0
+              [[ $FIRST -ne 1 ]] && JSON="$JSON"','
+              FIRST=0
 
-            JSON="$JSON"'{"target":"'"$TARGET"'","tags":"'"$TAGS"'"}'
-          done <<< $(perl ./scripts/dump-target-info.pl targets 2>/dev/null | ([[ -n "$TARGET_FILTER" ]] && grep -w "$TARGET_FILTER" || cat))
+              JSON="$JSON"'{"distro":"'"$DISTRO"'", "target":"'"$TARGET"'","tags":"'"$TAGS"'"}'
+            done <<< $(perl ./scripts/dump-target-info.pl targets 2>/dev/null | ([[ -n "$TARGET_FILTER" ]] && grep -w "$TARGET_FILTER" || cat))
+
+          done
 
           JSON='{"include":'"$JSON"']}'
           echo -e "\n---- sdks ----\n"
@@ -221,6 +236,7 @@ jobs:
           flavor: |
             latest=false
             prefix=${{ github.event.inputs.prefix }}
+            suffix=${{ matrix.distro == 'alpine' && '-alpine' || '' }}
           tags: |
             ${{ matrix.target }}-${{ needs.generate_matrix.outputs.ref }}
             ${{ matrix.target }}-${{ needs.generate_matrix.outputs.version }}
@@ -236,6 +252,7 @@ jobs:
           push: false
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          file: ${{ matrix.distro == 'debian' && 'Dockerfile' || 'Dockerfile.alpine' }}
           build-args: |
             DOWNLOAD_FILE=imagebuilder-.*x86_64.tar.[xz|zst]
             VERSION_PATH=${{ needs.generate_matrix.outputs.version_path }}
@@ -260,6 +277,7 @@ jobs:
           no-cache: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          file: ${{ matrix.distro == 'debian' && 'Dockerfile' || 'Dockerfile.alpine' }}
           build-args: |
             DOWNLOAD_FILE=imagebuilder-.*x86_64.tar.[xz|zst]
             VERSION_PATH=${{ needs.generate_matrix.outputs.version_path }}
@@ -313,7 +331,7 @@ jobs:
           flavor: |
             latest=false
             prefix=${{ github.event.inputs.prefix }}
-            suffix=-${{ needs.generate_matrix.outputs.ref }}
+            suffix=-${{ needs.generate_matrix.outputs.ref }}${{ matrix.distro == 'alpine' && '-alpine' || '' }}
           tags: ${{ matrix.tags }}
 
       - name: Docker meta (version)
@@ -327,7 +345,7 @@ jobs:
           flavor: |
             latest=false
             prefix=${{ github.event.inputs.prefix }}
-            suffix=-${{ needs.generate_matrix.outputs.version }}
+            suffix=-${{ needs.generate_matrix.outputs.version }}${{ matrix.distro == 'alpine' && '-alpine' || '' }}
           tags: ${{ matrix.tags }}
 
       - name: Docker meta (master)
@@ -342,7 +360,7 @@ jobs:
           flavor: |
             latest=false
             prefix=${{ github.event.inputs.prefix }}
-            suffix=-master
+            suffix=-master${{ matrix.distro == 'alpine' && '-alpine' || '' }}
           tags: ${{ matrix.tags }}
 
       - name: Docker meta (target and arch)
@@ -357,6 +375,7 @@ jobs:
           flavor: |
             latest=false
             prefix=${{ github.event.inputs.prefix }}
+            suffix=${{ matrix.distro == 'alpine' && '-alpine' || '' }}
           tags: ${{ matrix.tags }}
 
       - name: Docker meta (latest)
@@ -368,6 +387,8 @@ jobs:
             ghcr.io/${{ github.repository_owner }}/sdk
             ${{ env.DOCKER_USER != '' && format('docker.io/{0}/sdk', env.DOCKER_USER) || '' }}
             ${{ env.QUAY_USER != '' && format('quay.io/{0}/sdk', env.QUAY_USER) || '' }}
+          flavor: |
+            suffix=${{ matrix.distro == 'alpine' && '-alpine' || '' }}
           tags: latest
 
       - name: Build

Dockerfile.alpine

@@ -0,0 +1,68 @@
+FROM alpine:latest
+
+USER root
+
+RUN apk add -u --no-cache \
+  bash \
+  build-base \
+  bzip2 \
+  ccache \
+  coreutils \
+  diffutils \
+  findutils \
+  gawk \
+  git \
+  gettext \
+  gpg \
+  gpg-agent \
+  grep \
+  gzip \
+  libxslt \
+  ncurses-dev \
+  openssl-dev \
+  perl \
+  python3 \
+  py3-setuptools \
+  rsync \
+  unzip \
+  util-linux \
+  tar \
+  wget \
+  xz \
+  zlib-dev \
+  zstd
+
+ARG USER=buildbot
+ARG WORKDIR=/builder/
+ARG CMD="/bin/bash"
+
+ARG DOWNLOAD_FILE="imagebuilder-.*x86_64.tar.[xz|zst]"
+ARG TARGET=x86/64
+ARG FILE_HOST=downloads.openwrt.org
+ARG VERSION_PATH
+
+ENV DOWNLOAD_FILE=$DOWNLOAD_FILE
+ENV TARGET=$TARGET
+ENV FILE_HOST=$FILE_HOST
+ENV VERSION_PATH=$VERSION_PATH
+
+RUN adduser -h $WORKDIR -DH $USER
+
+USER $USER
+WORKDIR $WORKDIR
+
+ADD --chown=buildbot:buildbot keys/*.asc /builder/keys/
+COPY --chmod=0755 setup.sh /builder/setup.sh
+
+ARG RUN_SETUP=0
+ENV RUN_SETUP=$RUN_SETUP
+RUN if [ "$RUN_SETUP" -eq 1 ]; then /builder/setup.sh; fi
+
+ENV LD_LIBRARY_PATH=/builder/staging_dir/host/lib/
+RUN mkdir -p /builder/tmp
+
+ENTRYPOINT [ ]
+
+# required to have CMD as ENV to be executed
+ENV CMD_ENV=${CMD}
+CMD ${CMD_ENV}