[CI] Test fully running from the github checkout action

.github/workflows/root-ci-config/build_root.py

@@ -150,7 +150,8 @@ def main():
             build_utils.print_warning(f'Failed to download: {err}')
             args.incremental = False
 
-    git_pull("src", args.repository, args.base_ref)
+    if not args.source_dir:
+        git_pull("src", args.repository, args.base_ref)
 
     benchmark: bool = 'rootbench' in options_dict and options_dict['rootbench'] == "ON"
     if benchmark:
@@ -173,7 +174,10 @@ def main():
         # Delete all the .gcda files produced by an artifact.
         build_utils.remove_file_match_ext(WORKDIR, "gcda")
 
-    build(options, args.buildtype)
+    if args.source_dir:
+        build(options, build_type=args.buildtype, source_dir=args.source_dir)
+    else:
+        build(options, build_type=args.buildtype)
 
     # Done before anything else touches the build tree, and reported only at the
     # very end so that a spurious rebuild does not cost us the test results.
@@ -244,6 +248,7 @@ def parse_args():
     parser.add_argument("--pull_repository", default="",        help="Url to the pull request incoming repository")
     parser.add_argument("--head_ref",        default=None,      help="Ref to feature branch; it may contain a :<dst> part")
     parser.add_argument("--head_sha",        default=None,      help="Sha of commit that triggered the event")
+    parser.add_argument("--source_dir",      default=None,      help="Don't check out. Just use the source dir provided here.")
     parser.add_argument("--binaries",        default="false",   help="Whether to create binary artifacts")
     parser.add_argument("--architecture",    default=None,      help="Windows only, target arch")
     parser.add_argument("--repository",      default="https://github.com/root-project/root.git",
@@ -259,7 +264,7 @@ def parse_args():
     args.binaries = args.binaries.lower() in ('yes', 'true', '1', 'on')
     args.upload_artifacts = args.upload_artifacts.lower() in ('yes', 'true', '1', 'on')
 
-    if not args.base_ref:
+    if not args.base_ref and not args.source_dir:
         die(os.EX_USAGE, "base_ref not specified")
 
     if not args.platform_config: # If nothing special, we take the standard platform configuration, called as the platform
@@ -402,7 +407,6 @@ def archive_and_upload(archive_name, prefix):
     os.chdir(WORKDIR)
 
     with tarfile.open(f"{WORKDIR}/{new_archive}", "x:gz", compresslevel=COMPRESSIONLEVEL) as targz:
-        targz.add("src")
         targz.add("build")
 
     try:
@@ -422,8 +426,11 @@ def archive_and_upload(archive_name, prefix):
 
 
 @github_log_group("Configure")
-def cmake_configure(options, buildtype):
-    srcdir = os.path.join(WORKDIR, "src")
+def cmake_configure(options, **kwargs):
+    if "source_dir" in kwargs:
+        srcdir = kwargs["source_dir"]
+    else:
+        srcdir = os.path.join(WORKDIR, "src")
     builddir = os.path.join(WORKDIR, "build")
 
     # Add a private option to make the CI build faster by not changing the
@@ -432,31 +439,13 @@ def cmake_configure(options, buildtype):
     options = f"{options} -DROOT_COMPILEDATA_IGNORE_BUILD_NODE_CHANGES=ON"
 
     result = subprocess_with_log(f"""
-        cmake -S '{srcdir}' -B '{builddir}' -DCMAKE_BUILD_TYPE={buildtype} {options}
+        cmake --fresh -S '{srcdir}' -B '{builddir}' -DCMAKE_BUILD_TYPE={kwargs["build_type"]} {options}
     """)
 
     if result != 0:
         die(result, "Failed cmake generation step")
 
 
-@github_log_group("Dump existing configuration")
-def cmake_dump_config():
-    # Print CMake cached config
-    srcdir = os.path.join(WORKDIR, "src")
-    builddir = os.path.join(WORKDIR, "build")
-    result = subprocess_with_log(f"""
-        cmake -S '{srcdir}' -B '{builddir}' -N -L
-    """)
-
-    if result != 0:
-        die(result, "Failed cmake cache print step")
-
-
-@github_log_group("Dump requested build configuration")
-def dump_requested_config(options):
-    print(f"\nBUILD OPTIONS: {options}")
-
-
 def cmake_build_command(buildtype) -> str:
     generator_flags = "-- '-verbosity:minimal' '-consoleloggerparameters:summary'" if WINDOWS else ""
     parallel_jobs = "4" if WINDOWS else str(os.cpu_count())
@@ -501,22 +490,17 @@ def rebuild() -> int:
     return not touched
 
 
-def build(options, buildtype):
+def build(options, **kwargs):
     if not os.path.isdir(os.path.join(WORKDIR, "build")):
         builddir = os.path.join(WORKDIR, "build")
         result = subprocess_with_log(f"mkdir {builddir}")
 
         if result != 0:
             die(result, "Failed to create build directory")
 
-    if not os.path.exists(os.path.join(WORKDIR, "build", "CMakeCache.txt")):
-        cmake_configure(options, buildtype)
-    else:
-        cmake_dump_config()
-
-    dump_requested_config(options)
+    cmake_configure(options, **kwargs)
 
-    cmake_build(buildtype)
+    cmake_build(kwargs["build_type"])
 
 
 @github_log_group("Create binary packages")

.github/workflows/root-ci.yml

@@ -133,7 +133,7 @@
       - self-hosted
       - ${{ matrix.platform }}
 
     name: |
       ${{ matrix.platform }} ${{ matrix.arch }}
       ${{ (github.event_name != 'schedule' && github.event_name != 'workflow_dispatch' && join( matrix.overrides, ', ' )) || '' }}
 
@@ -152,8 +152,8 @@
         if: github.event_name == 'pull_request'
         env:
           GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
           OVERRIDES: ${{ join( matrix.overrides, ' ') }}
         run: |
           [ -d "${VIRTUAL_ENV_DIR}" ] && source ${VIRTUAL_ENV_DIR}/bin/activate
           echo "Python is now $(which python3) $(python3 --version)"
           src/.github/workflows/root-ci-config/build_root.py  \
@@ -185,7 +185,7 @@
       - name: Nightlies and push to branch
         if:   github.event_name == 'schedule' || github.event_name == 'push'
         env:
           OVERRIDES: ${{ github.event_name == 'push' && format('{0} {1} {2}', '--overrides', env.GLOBAL_OVERRIDES, join( matrix.overrides, ' ')) || '' }}
           BASE_REF:  ${{ github.event_name == 'push' && github.ref_name || inputs.ref_name }}
         run: |
           [ -d "${VIRTUAL_ENV_DIR}" ] && source ${VIRTUAL_ENV_DIR}/bin/activate
@@ -498,10 +498,18 @@
             echo ROOT_OBJECT_AUTO_REGISTRATION=0 >> $GITHUB_ENV;
           fi
 
-      - name: Checkout
-        uses: actions/checkout@v6
+      - name: Checkout root build scripts
+        uses: actions/checkout@v7
         with:
           ref: ${{ inputs.ref_name }}
+          sparse-checkout: .github/workflows/
+          show-progress: false
+
+      - name: Checkout root
+        uses: actions/checkout@v7
+        with:
+          path: src/
+          show-progress: false
 
       - name: Dump GitHub context
         env:
@@ -538,11 +546,7 @@
                     --dockeropts      \"$CONTAINER_OPTIONS\"
                     --incremental     $INCREMENTAL
                     --base_ref        ${{ github.base_ref }}
-                    --sha             ${{ github.sha }}
-                    --pull_repository ${{ github.event.pull_request.head.repo.clone_url }}
-                    --head_ref        refs/pull/${{ github.event.pull_request.number }}/head:${{ github.event.pull_request.head.ref }}
-                    --head_sha        ${{ github.event.pull_request.head.sha }}
-                    --repository      ${{ github.server_url }}/${{ github.repository }}
+                    --source_dir      ${GITHUB_WORKSPACE}/src
                     --overrides       ${GLOBAL_OVERRIDES} ${OVERRIDES}
               "
 
@@ -611,13 +615,13 @@
 
       - name: Check headers
         if: steps.install.outcome == 'success'
-        run: bash test/PostInstall/check-headers.sh ${{ env.INSTALL_DIR }}/include/
+        run: bash ${GITHUB_WORKSPACE}/src/test/PostInstall/check-headers.sh ${{ env.INSTALL_DIR }}/include/
 
       - name: Build post-install test project
         id: postInstall
         if: steps.install.outcome == 'success'
         run: |
-          cmake -S test/PostInstall/ -B ${{ env.POST_INSTALL_DIR }} -DCMAKE_PREFIX_PATH=${{ env.INSTALL_DIR }};
+          cmake -S ${GITHUB_WORKSPACE}/src/test/PostInstall/ -B ${{ env.POST_INSTALL_DIR }} -DCMAKE_PREFIX_PATH=${{ env.INSTALL_DIR }};
           cmake --build ${{ env.POST_INSTALL_DIR }};
 
       - name: CTest in post-install test project