Improve messages and behaviour when detecting unhappy installation paths

.github/workflows/tests.yml

@@ -445,16 +445,29 @@ jobs:
           fi
 
           # Print status
-          python -c \
-            "import sys; import khiops.core as kh; return_code = kh.get_runner().print_status(); sys.exit(return_code)"
-          RETCODE=$?
+          PATTERN=$(python -c \
+            "import sys; import khiops.core as kh; return_code = kh.get_runner().print_status(); sys.exit(return_code)" 2> >(grep -Ei 'with.*?unknown.*?installer') )                    
           # The installation status check will fail
           # because the library was not installed properly (the source code was only cloned)
-          if [ $RETCODE -ne 0 ]; then
+          if [ -n "$PATTERN" ]; then
             echo "::error::Status error: improper setup, as expected: khiops-python has been cloned, not installed from a package"
           fi
 
-          # Run integration tests on Ubuntu and Rocky
+          # Run the library against an incompatible Khiops (with a different major version)
+          # This instance of Khiops is isolated in a dedicated conda environment
+          CONDA="/root/miniforge3/bin/conda"                
+          # Check an error is raised because of the major version mismatch
+          # The khiops-python library from the cloned sources is used here
+          PATTERN=$($CONDA run -n py3_khiops10_conda python -c "import khiops.core as kh; print(kh.get_runner().khiops_version)" 2> >(grep -Ei 'major version.*?does not match'))          
+          if [ -z "$PATTERN" ]; then
+            echo "::error::Status error: khiops-python should fail because of the major version mismatch"          
+            if [[ "${{ matrix.container }}" == "debian13" ]]; then            
+              deactivate                      
+            fi          
+            exit 1;
+          fi
+
+          # Run the remaining integration tests
           python -m unittest -v tests.test_khiops_integrations
 
           # Execute Khiops sample (train and deploy model), which uses MPI

khiops/core/internals/runner.py

@@ -1076,30 +1076,46 @@ def _initialize_khiops_version(self):
             error_msg += f"\nstderr: {stderr}" if stderr else ""
             raise KhiopsRuntimeError(error_msg)
 
+        # Khiops core version
         self._khiops_version = KhiopsVersion(khiops_version_str)
 
-        # Warn if the khiops version does not match the Khiops Python library version
-        # Note: Currently the check is very strict. It may be loosened in the future
-        # (major.minor.patch must be the same)
+        # Library version
         compatible_khiops_version = khiops.get_compatible_khiops_version()
+
+        operating_system = platform.system()
+        installation_method = _infer_khiops_installation_method()
+
+        # Fail immediately if the major versions differ
+        # Note: the installation status will not show at all
+        if self.khiops_version.major != compatible_khiops_version.major:
+            raise KhiopsRuntimeError(
+                f"Major version '{self.khiops_version.major}' of the Khiops "
+                "executables does not match the Khiops Python library major version "
+                f"'{compatible_khiops_version.major}'. "
+                "To avoid any compatibility error, "
+                "please update either the Khiops "
+                f"executables package for your '{operating_system}' operating "
+                "system, or the Khiops Python library, "
+                f"according to your '{installation_method}' environment. "
+                "See https://khiops.org for more information.",
+            )
+
+        # Warn if the khiops minor and patch versions do not match
+        # the Khiops Python library ones
         # KhiopsVersion implements the equality operator, which however also
         # takes pre-release tags into account.
         # The restriction here does not apply to pre-release tags
         if (
-            self.khiops_version.major,
             self.khiops_version.minor,
             self.khiops_version.patch,
         ) != (
-            compatible_khiops_version.major,
             compatible_khiops_version.minor,
             compatible_khiops_version.patch,
         ):
-            operating_system = platform.system()
-            installation_method = _infer_khiops_installation_method()
             warnings.warn(
                 f"Version '{self._khiops_version}' of the Khiops executables "
                 "does not match the Khiops Python library version "
-                f"'{khiops.__version__}' (different major.minor.patch version). "
+                f"'{khiops.__version__}' (different minor.patch version). "
                 "There may be compatibility errors and "
                 "we recommend to update either the Khiops "
                 f"executables package for your '{operating_system}' operating "
@@ -1160,8 +1176,9 @@ def _detect_library_installation_incompatibilities(self, library_root_dir):
                     f"Khiops Python library installation path '{library_root_dir}' "
                     "does not match the current Conda environment "
                     f"'{os.environ['CONDA_PREFIX']}'. "
-                    "Please install the Khiops Python library "
-                    "in the current Conda environment. "
+                    "Either deactivate the current Conda environment "
+                    "or use the Khiops Python library "
+                    "belonging to the current Conda environment. "
                     "Go to https://khiops.org for instructions.\n"
                 )
                 error_list.append(error)
@@ -1172,7 +1189,7 @@ def _detect_library_installation_incompatibilities(self, library_root_dir):
                     f"Khiops binary path '{self.khiops_path}' "
                     "does not match the current Conda environment "
                     f"'{os.environ['CONDA_PREFIX']}'. "
-                    "Please install the Khiops binary "
+                    "We recommend installing the Khiops binary "
                     "in the current Conda environment. "
                     "Go to https://khiops.org for instructions.\n"
                 )

packaging/docker/khiopspydev/Dockerfile.debian

@@ -74,7 +74,12 @@ RUN true \
         $CONDA install -y -n py${version}_conda \
         khiops-driver-s3==${KHIOPS_S3_DRIVER_REVISION} \
         khiops-driver-gcs==${KHIOPS_GCS_DRIVER_REVISION}; \
-    done' \
+    done; \
+    # Install Khiops from a different major version in a dedicated conda environment \
+    # The python interpreter version of the base environment is used as no specific version is given \
+    $CONDA create -y -n py3_khiops10_conda; \
+    $CONDA install -y -n py3_khiops10_conda khiops::khiops-core==10.3.1; \
+    ' \
   && true
 
 RUN mkdir -p /scripts

packaging/docker/khiopspydev/Dockerfile.rocky

@@ -87,8 +87,13 @@ RUN true \
         do \
             $CONDA create -y -n $CONDA_ENV python=${version}; \
         done; \
-        $CONDA install -y -n py${version}_conda ${RC_LABEL}khiops-core=$(echo ${KHIOPS_REVISION} | tr -d "-") ; \
-    done' \
+        $CONDA install -y -n py${version}_conda ${RC_LABEL}khiops-core==$(echo ${KHIOPS_REVISION} | tr -d "-") ; \
+    done; \
+    # Install Khiops from a different major version in a dedicated conda environment \
+    # The python interpreter version of the base environment is used as no specific version is given \
+    $CONDA create -y -n py3_khiops10_conda; \
+    $CONDA install -y -n py3_khiops10_conda khiops::khiops-core==10.3.1; \
+    ' \
   && true
 
 RUN mkdir -p /scripts

packaging/docker/khiopspydev/Dockerfile.ubuntu

@@ -72,7 +72,12 @@ RUN true \
         $CONDA install -y -n py${version}_conda \
         khiops-driver-s3==${KHIOPS_S3_DRIVER_REVISION} \
         khiops-driver-gcs==${KHIOPS_GCS_DRIVER_REVISION}; \
-    done' \
+    done; \
+    # Install Khiops from a different major version in a dedicated conda environment \
+    # The python interpreter version of the base environment is used as no specific version is given \
+    $CONDA create -y -n py3_khiops10_conda; \
+    $CONDA install -y -n py3_khiops10_conda khiops::khiops-core==10.3.1; \
+    ' \
   && true
 
 RUN mkdir -p /scripts