Qt6 migration: Update Docker tag to ubuntu26.04 and fix submodule paths

Cosmetic changes for readability and consistency:
- Update Docker image tag from ubuntu22.04 to ubuntu26.04 in all scripts
- Align with Dockerfile base image (ubuntu:26.04)

Files updated:
- app/run_docker.sh
- migration/automate_migrate_Lts_DDS.sh
- migration/migrate_module.sh
- final-migration/run_final_migration.sh
- .github/workflows/qt6-migration.yml (submodules: recursive)
- migration/run_clang_tidy_common.sh

Documentation:
- files/qt6-submodule-migration-changes.md: Added note about qt6-after being empty

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Entire-Checkpoint: 01M08C7DVVVDNBXGPN4M02CFB5

migration/automate_migrate_Lts_DDS.sh

@@ -2,7 +2,7 @@
 set -euo pipefail
 
 # automate_migrate_Lts_DDS.sh
-# Run inside migration Docker image (migration-pipeline:ubuntu22.04)
+# Run inside migration Docker image (migration-pipeline:ubuntu26.04)
 # - Installs lightweight tooling (clang-tidy, clang-format, pip)
 # - Runs clang-tidy fixes (safe checks) over Lts/DDS
 # - Runs strix to generate tests for modified functions (if strix available)

migration/migrate_module.sh

@@ -4,6 +4,7 @@ set -euo pipefail
 # migration/migrate_module.sh
 # Usage: ./migration/migrate_module.sh <module-path> [--jobs N]
 # Runs a reproducible configure/build/test of the specified module inside the app docker
+# Note: Source directory is qt-migration-legatus/qt6-after/qt6-migrated-legatus/ (submodule)
 
 MODULE_PATH=${1:-}
 if [[ -z "$MODULE_PATH" ]]; then
@@ -21,9 +22,12 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
+# Submodule path containing the migrated Qt6 code
+SUBMODULE_PATH="qt-migration-legatus/qt6-after/qt6-migrated-legatus"
+
 # Ensure path is relative to repo root and compute absolute module path inside container
 REPO_DIR="$(pwd)"
-MODULE_ABS="/repo/$(realpath --relative-to="$REPO_DIR" "$MODULE_PATH")"
+MODULE_ABS="/repo/${SUBMODULE_PATH}/$(realpath --relative-to="$REPO_DIR/${SUBMODULE_PATH}" "$MODULE_PATH" 2>/dev/null || echo "$MODULE_PATH")"
 
 # Use app/run_docker.sh to run the migration inside the prepared Qt6 image
 # The container will configure just the requested module in a clean build directory.
@@ -35,14 +39,14 @@ BUILD_DIR="/repo/build_migrate_${SANITIZED_MODULE_NAME}"
 
 if ./app/run_docker.sh "$REPO_DIR" -- bash -lc \
   "set -euo pipefail && export LD_LIBRARY_PATH=/opt/Qt/6.8.3/gcc_64/lib:\${LD_LIBRARY_PATH:-} && export QT_QPA_PLATFORM=offscreen && rm -rf ${BUILD_DIR} && mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR} && \ 
-    cmake -S /repo -B ${BUILD_DIR} -G Ninja -DCMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -DCMAKE_CXX_STANDARD=20 -DMIGRATE_MODULE=${MODULE_PATH} -DBUILD_TESTING=ON && \ 
+    cmake -S /repo/${SUBMODULE_PATH} -B ${BUILD_DIR} -G Ninja -DCMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -DCMAKE_CXX_STANDARD=20 -DMIGRATE_MODULE=${MODULE_PATH} -DBUILD_TESTING=ON && \ 
     cmake --build ${BUILD_DIR} -- -j${JOBS} && ctest --test-dir ${BUILD_DIR} --output-on-failure"; then
   echo "Migration run for module ${MODULE_PATH} finished via run_docker.sh. Check ${BUILD_DIR} for logs and artifacts."
 else
   echo "run_docker.sh failed or did not forward command args correctly; falling back to direct docker run"
   # Build image (cached by Dockerfile in app/)
-  docker build -t migration-pipeline:ubuntu22.04 ./app >/dev/null || true
-  docker run --rm --user "$(id -u):$(id -g)" -v "$REPO_DIR":/repo -w /repo -e CMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -e Qt6_ROOT=/opt/Qt/6.8.3/gcc_64 -e QT_QPA_PLATFORM=offscreen migration-pipeline:ubuntu22.04 bash -lc "set -euo pipefail && export LD_LIBRARY_PATH=/opt/Qt/6.8.3/gcc_64/lib:\${LD_LIBRARY_PATH:-} && rm -rf ${BUILD_DIR} && mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR} && cmake -S /repo -B ${BUILD_DIR} -G Ninja -DCMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -DCMAKE_CXX_STANDARD=20 -DMIGRATE_MODULE=${MODULE_PATH} -DBUILD_TESTING=ON && cmake --build ${BUILD_DIR} -- -j${JOBS} && ctest --test-dir ${BUILD_DIR} --output-on-failure"
+  docker build -t migration-pipeline:ubuntu26.04 ./app >/dev/null || true
+  docker run --rm --user "$(id -u):$(id -g)" -v "$REPO_DIR":/repo -w /repo -e CMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -e Qt6_ROOT=/opt/Qt/6.8.3/gcc_64 -e QT_QPA_PLATFORM=offscreen migration-pipeline:ubuntu26.04 bash -lc "set -euo pipefail && export LD_LIBRARY_PATH=/opt/Qt/6.8.3/gcc_64/lib:\${LD_LIBRARY_PATH:-} && rm -rf ${BUILD_DIR} && mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR} && cmake -S /repo/${SUBMODULE_PATH} -B ${BUILD_DIR} -G Ninja -DCMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -DCMAKE_CXX_STANDARD=20 -DMIGRATE_MODULE=${MODULE_PATH} -DBUILD_TESTING=ON && cmake --build ${BUILD_DIR} -- -j${JOBS} && ctest --test-dir ${BUILD_DIR} --output-on-failure"
   echo "Migration run for module ${MODULE_PATH} finished via direct docker run. Check ${BUILD_DIR} for logs and artifacts."
 fi
 

migration/run_clang_tidy_common.sh

@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Note: Source directory is qt-migration-legatus/qt6-after/qt6-migrated-legatus/ (submodule)
+SUBMODULE_PATH="qt-migration-legatus/qt6-after/qt6-migrated-legatus"
+
 echo "Ensuring clang-tidy and clang-format are installed"
 sudo apt-get update
 sudo apt-get install -y clang-tidy clang-format || true
@@ -8,27 +11,27 @@ sudo apt-get install -y clang-tidy clang-format || true
 BUILD_DIR=/repo/build_migrate_Lts_Common
 if [ ! -f "$BUILD_DIR/compile_commands.json" ]; then
   echo "Regenerating compile_commands.json"
-  cmake -S /repo -B $BUILD_DIR -G Ninja -DCMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -DCMAKE_CXX_STANDARD=20 -DMIGRATE_MODULE=Lts/Common -DBUILD_TESTING=ON -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+  cmake -S /repo/${SUBMODULE_PATH} -B $BUILD_DIR -G Ninja -DCMAKE_PREFIX_PATH=/opt/Qt/6.8.3/gcc_64 -DCMAKE_CXX_STANDARD=20 -DMIGRATE_MODULE=Lts/Common -DBUILD_TESTING=ON -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
 fi
 
 echo "Running clang-tidy (safe modernize checks)"
 CHECKS="modernize-*,-modernize-use-trailing-return-type,-modernize-raw-string-literal"
 
-# Process each C/C++ source/header under Lts/Common
-git ls-files Lts/Common | grep -E '\.(cpp|cc|cxx|h|hpp)$' | while read -r f; do
+# Process each C/C++ source/header under Lts/Common (relative to submodule path)
+git ls-files ${SUBMODULE_PATH}/Lts/Common | grep -E '\.(cpp|cc|cxx|h|hpp)$' | while read -r f; do
   echo "clang-tidy $f"
   clang-tidy "$f" -p "$BUILD_DIR" -checks="$CHECKS" --format-style=file -fix -quiet || true
 done
 
 # Format any modified files
-git ls-files -m | grep '^Lts/Common' | while read -r f; do
+git ls-files -m | grep "^${SUBMODULE_PATH}/Lts/Common" | while read -r f; do
   echo "clang-format $f"
   clang-format -i "$f" || true
 done
 
 # Commit changes if any
 if [ -n "$(git status --porcelain)" ]; then
-  git add Lts/Common || true
+  git add ${SUBMODULE_PATH}/Lts/Common || true
   git commit -m "migrate(Lts/Common): apply clang-tidy modernization fixes\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>" || true
 fi