CMake regeneration workflow

.github/workflows/sync_cmakebuild.yml

@@ -3,21 +3,43 @@ on:
   schedule:
     - cron: "0 * * * *"
   workflow_dispatch:
-    inputs:
-      test_label_regexp:
-        required: false
-        type: string
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+env:
+  REPO: ${{ github.repository }}
+  TOKEN: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
 jobs:
-  build:
+  sync:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-      with:
-        ref: cmakebuild
     - name: Sync
       run: |
-        git checkout main -- ydb/ci/sync_cmakebuild.sh
-        cp ydb/ci/sync_cmakebuild.sh ~
-        git restore ydb/ci/sync_cmakebuild.sh
-        ~/sync_cmakebuild.sh
-        git push
+        mainsha=$(curl -s -H "Accept: application/vnd.github.VERSION.sha" https://api.github.com/repos/$REPO/commits/main)
+        echo "Main sha: ${mainsha}"
+        lastsha=$(curl -s https://raw.githubusercontent.com/$REPO/cmakebuild/ydb/ci/cmakegen.txt)
+        echo "Last sha: ${lastsha}"
+        if [ ${mainsha} == ${lastsha} ];then
+          echo "No new commits on the main branch to merge, exiting"
+          exit 0
+        fi
+        git clone -b main --shallow-exclude cmakebuild https://$TOKEN@github.com/$REPO.git ydb
+        git config --global user.email "alex@ydb.tech"
+        git config --global user.name "Alexander Smirnov"
+        cd ydb
+        git fetch --depth `expr $(git rev-list --count HEAD) + 1`
+        git fetch origin cmakebuild:cmakebuild --depth 3 # 1st with cmake generation, 2nd with previous merge, 3rd is common between main and cmakebuild
+        mainsha=$(git rev-parse HEAD)
+        git checkout cmakebuild
+        prevsha=$(git rev-parse HEAD)
+        git merge main --no-edit
+        currsha=$(git rev-parse HEAD)
+        if [ ${prevsha} == ${currsha} ];then
+          echo "Merge did not bring any changes, exiting"
+          exit
+        fi
+        ./generate_cmake -k
+        echo ${mainsha} > ydb/ci/cmakegen.txt
+        git add .
+        git commit -m "Generate cmake for ${mainsha}"
+        git push --set-upstream origin cmakebuild