[openwrt/openwrt] CI: build: add checks to test if toolchain container can be used

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch openwrt-23.05:
https://git.openwrt.org/6099d083a656816847207c9cfcb4a1cf86e7aa00

commit 6099d083a656816847207c9cfcb4a1cf86e7aa00
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Tue May 23 15:25:56 2023 +0200

    CI: build: add checks to test if toolchain container can be used
    
    Add checks to test if toolchain container can be used.
    This is to handle case of new target or migration of any sort.
    
    If the toolchain container can't be found, the tools container is used
    instead.
    
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
    (cherry picked from commit 23a5c715a9296e828be5c32eadf68eacdb326a0a)
---
 .github/workflows/build.yml | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index da389e9cf8..c3843d1dfc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -65,6 +65,7 @@ jobs:
     outputs:
       owner_lc: ${{ steps.lower_owner.outputs.owner_lc }}
       container_tag: ${{ steps.determine_tools_container.outputs.container_tag }}
+      container_name: ${{ steps.determine_tools_container.outputs.container_name }}
 
     steps:
       - name: Checkout
@@ -91,6 +92,7 @@ jobs:
       - name: Determine tools container tag
         id: determine_tools_container
         run: |
+          CONTAINER_NAME=${{ inputs.container_name }}
           CONTAINER_TAG=latest
           if [ -n "${{ github.base_ref }}" ]; then
             if echo "${{ github.base_ref }}" | grep -q -E '^openwrt-[0-9][0-9]\.[0-9][0-9]$'; then
@@ -107,15 +109,29 @@ jobs:
               CONTAINER_TAG=openwrt-"$(echo ${{ github.ref_name }} | sed 's/^v\([0-9][0-9]\.[0-9][0-9]\)\..\+/\1/')"
             fi
           fi
-          echo "Tools container to use tools:$CONTAINER_TAG"
+
+          if [ "$CONTAINER_NAME" = "toolchain" ]; then
+            GHCR_TOKEN=$(echo ${{ secrets.GITHUB_TOKEN }} | base64)
+            GHCR_HEADER="Authorization: Bearer ${GHCR_TOKEN}"
+            GHCR_MANIFEST_LINK=https://ghcr.io/v2/${{ steps.lower_owner.outputs.owner_lc }}/${{ inputs.container_name }}/manifests/${{ inputs.target }}-${{ inputs.subtarget }}-"$CONTAINER_TAG"
+            # Check if container exist
+            if [ $(curl -s -o /dev/null -w "%{http_code}" -H "$GHCR_HEADER" -I "$GHCR_MANIFEST_LINK") = 200 ]; then
+              CONTAINER_TAG=${{ inputs.target }}-${{ inputs.subtarget }}-"$CONTAINER_TAG"
+            else
+              CONTAINER_NAME=tools
+            fi
+          fi
+
+          echo "Tools container to use $CONTAINER_NAME:$CONTAINER_TAG"
           echo "container_tag=$CONTAINER_TAG" >> $GITHUB_OUTPUT
+          echo "container_name=$CONTAINER_NAME" >> $GITHUB_OUTPUT
 
   build:
     name: Build ${{ inputs.target }}/${{ inputs.subtarget }}
     needs: setup_build
     runs-on: ubuntu-latest
 
-    container: ghcr.io/${{ needs.setup_build.outputs.owner_lc }}/${{ inputs.container_name }}:${{ needs.setup_build.outputs.container_tag }}
+    container: ghcr.io/${{ needs.setup_build.outputs.owner_lc }}/${{ needs.setup_build.outputs.container_name }}:${{ needs.setup_build.outputs.container_tag }}
 
     permissions:
       contents: read