From e24a1e6f6d7f08fb766eb11b8008f8fc5b72d072 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Mon, 28 Nov 2022 12:44:01 +0100
Subject: [PATCH] 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>
---
 .github/workflows/build.yml | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 510ff6a879..909b849731 100644
--- 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