CI: build: add support for external toolchains from stable branch

Add support to use external toolchains from stable branch if we are
testing commit targeting stable openwrt branch in kernel and packages
workflow.

With pr the target branch is parsed and the right toolchain is used.

To use the stable toolchain for local testing the branch needs to have
the prefix openwrt-[0-9][0-9].[0-9][0-9]- (example openwrt-21.02-fixup)

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 510ff6a8797ac68fc1397c93960083559bd5fe5b..909b849731b9a5caa867ce222a87c5d21e0aec04 100644 (file)
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -145,13 +145,38 @@ jobs:
         if: inputs.build_toolchain == false
         working-directory: openwrt
         run: |
-          TOOLCHAIN_STRING="$(curl "https://downloads.cdn.openwrt.org/snapshots/targets/${{ env.TARGET }}/${{ env.SUBTARGET }}/sha256sums" \
+          TOOLCHAIN_PATH=snapshots
+
+          if [ -n "${{ github.base_ref }}" ]; then
+            if echo "${{ github.base_ref }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]'; then
+              major_ver="$(echo ${{ github.base_ref }} | sed 's/openwrt-/v/')"
+            fi
+          elif [ "${{ github.ref_type }}" = "branch" ]; then
+            if echo "${{ github.ref_name }}" | grep -q -E 'openwrt-[0-9][0-9]\.[0-9][0-9]-'; then
+              major_ver="$(echo ${{ github.ref_name }} | sed 's/openwrt-\([0-9][0-9]\.[0-9][0-9]\)-.*/v\1/')"
+            fi
+          elif [ "${{ github.ref_type }}" = "tag" ]; then
+            if echo "${{ github.ref_name }}" | grep -q -E 'v[0-9][0-9]\.[0-9][0-9]\..+'; then
+              major_ver="$(sed 's/\(v[0-9][0-9]\.[0-9][0-9]\)\..\+/\1/')"
+            fi
+          fi
+
+          if [ -n "$major_ver" ]; then
+            git fetch --tags
+            latest_tag="$(git tag --sort=-creatordate -l $major_ver* | head -n1)"
+            if [ -n "$latest_tag" ]; then
+              TOOLCHAIN_PATH=releases/$(echo $latest_tag | sed 's/^v//')
+            fi
+          fi
+
+          TOOLCHAIN_STRING="$(curl "https://downloads.cdn.openwrt.org/$TOOLCHAIN_PATH/targets/${{ env.TARGET }}/${{ env.SUBTARGET }}/sha256sums" \
             | grep ".*openwrt-toolchain.*tar.xz")"
           TOOLCHAIN_FILE=$(echo "$TOOLCHAIN_STRING" | sed -n -e 's/.*\(openwrt-toolchain.*\).tar.xz/\1/p')
           TOOLCHAIN_SHA256=$(echo "$TOOLCHAIN_STRING" | cut -d ' ' -f 1)
 
           echo "TOOLCHAIN_FILE=$TOOLCHAIN_FILE" >> "$GITHUB_ENV"
           echo "TOOLCHAIN_SHA256=$TOOLCHAIN_SHA256" >> "$GITHUB_ENV"
+          echo "TOOLCHAIN_PATH=$TOOLCHAIN_PATH" >> "$GITHUB_ENV"
 
       - name: Cache external toolchain
         if: inputs.build_toolchain == false
@@ -174,7 +199,7 @@ jobs:
         shell: su buildbot -c "sh -e {0}"
         working-directory: openwrt
         run: |
-          wget -O - https://downloads.cdn.openwrt.org/snapshots/targets/${{ env.TARGET }}/${{ env.SUBTARGET }}/${TOOLCHAIN_FILE}.tar.xz \
+          wget -O - https://downloads.cdn.openwrt.org/${{ env.TOOLCHAIN_PATH }}/targets/${{ env.TARGET }}/${{ env.SUBTARGET }}/${{ env.TOOLCHAIN_FILE }}.tar.xz \
             | tar --xz -xf -
 
       - name: Extract prebuilt tools