Keep image globs outside quotes so they expand

The workflow was mostly inline bash. Moves the logic into reusable
composite actions under .gitea/actions/, keeps host paths in the
YOCTO_HOME repo variable, adds a workflow_dispatch skip-build option
and publishes step outputs (build dir, image list, kas path).

.config.yaml

@@ -12,21 +12,21 @@ target: rpilinux-image
 
 repos:
   meta-raspberrypi:
-    url: http://git.yoctoproject.org/git/meta-raspberrypi
+    url: https://git.yoctoproject.org/git/meta-raspberrypi
-    path: extern/
+    path: extern/meta-raspberrypi
     tag: scarthgap
   poky:
-    url: http://git.yoctoproject.org/git/poky
+    url: https://git.yoctoproject.org/git/poky
     tag: scarthgap
-    path: extern/
+    path: extern/poky
     layers:
       meta:
       meta-poky:
       meta-yocto-bsp:
   meta-openembedded:
-    url: git://git.openembedded.org/meta-openembedded
+    url: https://git.openembedded.org/meta-openembedded
     tag: scarthgap
-    path: extern/
+    path: extern/meta-openembedded
     layers:
       meta-oe:
       meta-multimedia:
@@ -34,6 +34,8 @@ repos:
       meta-python:
   local:
     path: meta-rpilinux
+  local:
+    path: meta-rpilinux
 
 local_conf_header:
   ipk: |

.gitea/actions/build-image/action.yml

@@ -0,0 +1,118 @@
+name: build-image
+description: >-
+  Build a kas project in a persistent directory and expose the flashable
+  images. The workspace is synced into the build dir instead of built in
+  place, because checkout cleans ignored files (build/, extern/) and bitbake
+  reuse depends on sstate-cache surviving between runs.
+inputs:
+  project:
+    description: kas configuration file, relative to the repository
+    required: false
+    default: .config.yaml
+  machine:
+    description: Machine the images are deployed for
+    required: false
+    default: raspberrypi4-64
+  image-prefix:
+    description: Artifact filename prefix in the deploy dir
+    required: false
+    default: rpilinux-image
+  skip-build:
+    description: Set to true to only collect images from an existing build dir
+    required: false
+    default: "false"
+outputs:
+  build-dir:
+    description: Persistent project directory on the runner
+    value: ${{ steps.locate.outputs.build-dir }}
+  image-dir:
+    description: Deploy dir bitbake wrote to
+    value: ${{ steps.locate.outputs.image-dir }}
+  images:
+    description: Newline separated artifact filenames
+    value: ${{ steps.collect.outputs.images }}
+runs:
+  using: composite
+  steps:
+    - name: Sync workspace into persistent build dir
+      if: ${{ inputs.skip-build != 'true' }}
+      shell: bash
+      run: |
+        set -euo pipefail
+        SRC="$(pwd)"
+        DST="${YOCTO_HOME:-$HOME/yocto-build}/$(basename "$GITHUB_REPOSITORY")"
+        # checkout deletes ignored files, so the build tree must live elsewhere
+        if [ "$SRC" = "$DST" ]; then
+          echo "::error::workspace == build dir ($SRC); point YOCTO_HOME somewhere else"
+          exit 1
+        fi
+        echo "syncing $SRC -> $DST"
+        mkdir -p "$DST"
+        # .git stays (kas requires a repo); extern/ + build/ only exist in DST,
+        # so --delete cannot reach them
+        rsync -a --delete --exclude /build/ --exclude /extern/ ./ "$DST/"
+
+    - name: kas build
+      if: ${{ inputs.skip-build != 'true' }}
+      shell: bash
+      run: |
+        set -euo pipefail
+        cd "${YOCTO_HOME:-$HOME/yocto-build}/$(basename "$GITHUB_REPOSITORY")"
+        git config --global --add safe.directory "$PWD" || true
+        "${YOCTO_HOME:-$HOME/yocto-build}/venv/bin/kas" build
+
+    - name: Locate deploy dir
+      id: locate
+      shell: bash
+      run: |
+        set -euo pipefail
+        BUILD_DIR="${YOCTO_HOME:-$HOME/yocto-build}/$(basename "$GITHUB_REPOSITORY")"
+        IMAGE_DIR="$(find "$BUILD_DIR/build" -type d -path "*/tmp/deploy/images/${{ inputs.machine }}" | head -1)"
+        if [ -z "$IMAGE_DIR" ]; then
+          echo "::error::no deploy dir for ${{ inputs.machine }} under $BUILD_DIR/build"
+          exit 1
+        fi
+        echo "build-dir=$BUILD_DIR" >> "$GITHUB_OUTPUT"
+        echo "image-dir=$IMAGE_DIR" >> "$GITHUB_OUTPUT"
+
+    - name: Collect artifacts
+      id: collect
+      shell: bash
+      run: |
+        set -euo pipefail
+        IMAGE_DIR="${{ steps.locate.outputs.image-dir }}"
+        shopt -s nullglob
+        # only the timestamped names: the short ones are hardlinks to the same
+        # inode and would upload every image twice.
+        # NOTE: the glob must stay OUTSIDE the quotes - "$DIR/pat*" never expands.
+        FILES=("${IMAGE_DIR}/${{ inputs.image-prefix }}."*.rootfs-[0-9]*.wic.* \
+               "${IMAGE_DIR}/${{ inputs.image-prefix }}-"*.rootfs-[0-9]*.wic.*)
+        if [ "${#FILES[@]}" -eq 0 ]; then
+          echo "::error::no flashable .wic image for ${{ inputs.machine }} in $IMAGE_DIR"
+          exit 1
+        fi
+        mkdir -p dist
+        cp -v "${FILES[@]}" dist/
+        ( cd dist && sha256sum * > SHA256SUMS )
+        ls -lh dist
+        printf 'images=%s\n' "$(ls dist | tr '\n' ' ')" >> "$GITHUB_OUTPUT"
+
+    - name: Summarise
+      shell: bash
+      run: |
+        set -euo pipefail
+        SUMMARY="${GITHUB_STEP_SUMMARY:-}"
+        [ -n "$SUMMARY" ] || exit 0
+        {
+          echo "## ${{ inputs.image-prefix }} for ${{ inputs.machine }}"
+          echo
+          echo "| artifact | sha256 |"
+          echo "| --- | --- |"
+          ( cd dist && while read -r sum file; do
+              [ "$file" = SHA256SUMS ] || echo "| \`$file\` | \`${sum:0:16}\` |"
+            done < SHA256SUMS )
+          echo
+          echo "Flash with \`bzcat <image> | sudo dd of=/dev/sdX bs=4M status=progress\`."
+          echo
+          echo "Incremental build tree: \`${{ steps.locate.outputs.build-dir }}\`"
+        } >> "$SUMMARY"

.gitea/actions/check-build-host/action.yml

@@ -0,0 +1,37 @@
+name: check-build-host
+description: >-
+  Report the build host and fail fast when executables, CPU or disk that the
+  build needs are missing - a mistake should cost seconds, not hours.
+inputs:
+  tools:
+    description: Space separated executables that must be on PATH
+    required: false
+    default: git python3
+  min-disk-gb:
+    description: Warn when the build filesystem has less than this much free
+    required: false
+    default: "100"
+runs:
+  using: composite
+  steps:
+    - name: Host report
+      shell: bash
+      run: |
+        set -euo pipefail
+        echo "os     : $(. /etc/os-release && echo "$PRETTY_NAME") ($(uname -m), $(uname -r))"
+        echo "user   : $(id -un)  home=$HOME"
+        echo "cpu    : $(nproc) cores / $(awk '/MemTotal/{printf "%.0fG", $2/1048576}' /proc/meminfo) ram"
+        df -h . | tail -1 | sed 's/^/disk   : /'
+        missing=""
+        for tool in ${{ inputs.tools }}; do
+          command -v "$tool" >/dev/null 2>&1 || missing="$missing $tool"
+        done
+        if [ -n "$missing" ]; then
+          echo "::error::Host is missing:$missing"
+          echo "Install them on the runner host, e.g. sudo apt-get install -y $missing"
+          exit 1
+        fi
+        free_gb="$(df --output=avail -BG . | tail -1 | tr -d ' ')"
+        if [ "$free_gb" -lt "${{ inputs.min-disk-gb }}" ]; then
+          echo "::warning::only ${free_gb}G free on $(df --output=target . | tail -1); expected >= ${{ inputs.min-disk-gb }}G"
+        fi

.gitea/actions/setup-kas/action.yml

@@ -0,0 +1,34 @@
+name: setup-kas
+description: Create or reuse the persistent python venv that holds kas.
+inputs:
+  requirement:
+    description: pip requirement for kas (pinned, e.g. kas==5.5)
+    required: false
+    default: kas
+outputs:
+  kas:
+    description: Absolute path of the kas executable
+    value: ${{ steps.venv.outputs.kas }}
+  reused:
+    description: "true when the venv already existed (warm run)"
+    value: ${{ steps.venv.outputs.reused }}
+runs:
+  using: composite
+  steps:
+    - name: Prepare venv
+      id: venv
+      shell: bash
+      run: |
+        set -euo pipefail
+        BUILD_ROOT="${YOCTO_HOME:-$HOME/yocto-build}"
+        VENV="$BUILD_ROOT/venv"
+        mkdir -p "$BUILD_ROOT"
+        if [ -d "$VENV" ]; then
+          echo "reused=true" >> "$GITHUB_OUTPUT"
+        else
+          echo "reused=false" >> "$GITHUB_OUTPUT"
+          python3 -m venv "$VENV"
+        fi
+        "$VENV/bin/pip" install --quiet --upgrade "${{ inputs.requirement }}"
+        echo "kas=$VENV/bin/kas" >> "$GITHUB_OUTPUT"
+        echo "kas $($VENV/bin/kas --version) in $VENV"

.gitea/workflows/build.yaml

@@ -0,0 +1,76 @@
+name: Build RPi image
+
+# Yocto (kas) build of rpilinux-image. Steps live in .gitea/actions/* so this
+# file stays a description of the pipeline, not a shell script.
+#
+# Host-specific paths come from repo settings (Settings -> Actions ->
+# Variables), so the workflow is not tied to one machine:
+#   YOCTO_HOME   persistent build dir on the runner
+# Order of precedence for the build dir: this variable, then the runner's
+# own YOCTO_HOME (runner.envs), then $HOME/yocto-build.
+
+on:
+  push:
+    # main is release protected, ci/* branches are free scratch space
+    branches: [main, 'ci/*']
+  pull_request:
+    # gates merges into main and posts the commit status that branch
+    # protection waits for
+    branches: [main]
+  workflow_dispatch:
+    inputs:
+      skip-build:
+        description: Collect images from the existing build dir instead of rebuilding
+        type: boolean
+        default: false
+
+concurrency:
+  group: yocto-rpi-build
+  cancel-in-progress: false
+
+permissions:
+  contents: read
+
+env:
+  YOCTO_HOME: ${{ vars.YOCTO_HOME }}
+  MACHINE: raspberrypi4-64
+  IMAGE_PREFIX: rpilinux-image
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    runs-on: yocto
+    timeout-minutes: 600
+    steps:
+      - name: Check out sources
+        uses: builtin:checkout
+
+      - name: Verify build host
+        uses: $/.gitea/actions/check-build-host
+        with:
+          tools: git python3 curl wget rsync gawk xz diffstat chrpath bison flex node
+          min-disk-gb: "200"
+
+      - name: Set up kas
+        id: kas
+        uses: $/.gitea/actions/setup-kas
+        with:
+          requirement: kas==5.5
+
+      - name: Build image
+        id: image
+        uses: $/.gitea/actions/build-image
+        with:
+          machine: ${{ env.MACHINE }}
+          image-prefix: ${{ env.IMAGE_PREFIX }}
+          skip-build: ${{ github.event.inputs.skip-build }}
+
+      - name: Upload image
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ env.IMAGE_PREFIX }}-${{ env.MACHINE }}
+          path: dist/
+          retention-days: 14

.zed/settings.json

@@ -0,0 +1,5 @@
+// Folder-specific settings
+//
+// For a full list of overridable settings, and general information on folder-specific settings,
+// see the documentation: https://zed.dev/docs/configuring-zed#settings-files
+{}