fix: enforce python version

The previous Python version check was incorrect, allowing installations
on unsupported interpreter versions, which caused installation failures.
Additionally, we now respect the specified interpreter version if
provided, consistently using it throughout the installation process by
enforcing it with pip.

Signed-off-by: Sébastien Han <seb@redhat.com>

Author: leseb

install/install_requirements.sh

@@ -9,26 +9,39 @@ set -eou pipefail
 
 # Install required python dependencies for developing
 # Dependencies are defined in .pyproject.toml
-PYTHON_EXECUTABLE=${PYTHON_EXECUTABLE:-python}
-if [[ -z ${CONDA_DEFAULT_ENV:-} ]] || [[ ${CONDA_DEFAULT_ENV:-} == "base" ]] || [[ ! -x "$(command -v python)" ]];
+if [ -z "${PYTHON_EXECUTABLE:-}" ];
 then
-  PYTHON_EXECUTABLE=python3
+  if [[ -z ${CONDA_DEFAULT_ENV:-} ]] || [[ ${CONDA_DEFAULT_ENV:-} == "base" ]] || [[ ! -x "$(command -v python)" ]];
+  then
+    PYTHON_EXECUTABLE=python3
+  fi
 fi
+echo "Using python executable: $PYTHON_EXECUTABLE"
 
+PYTHON_SYS_VERSION="$($PYTHON_EXECUTABLE -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')")"
 # Check python version. Expect 3.10.x or 3.11.x
-printf "import sys\nif sys.version_info.major != 3 or sys.version_info.minor < 10 :\n\tprint('Please use Python >=3.10');sys.exit(1)\n" | $PYTHON_EXECUTABLE
-if [[ $? -ne 0 ]]
+if ! $PYTHON_EXECUTABLE -c "
+import sys
+if sys.version_info < (3, 10) or sys.version_info >= (3, 12):
+    sys.exit(1)
+";
 then
+  echo "Python version must be 3.10.x or 3.11.x. Detected version: $PYTHON_SYS_VERSION"
   exit 1
 fi
 
 if [[ "$PYTHON_EXECUTABLE" == "python" ]];
 then
   PIP_EXECUTABLE=pip
-else
+elif [[ "$PYTHON_EXECUTABLE" == "python3" ]];
+then
   PIP_EXECUTABLE=pip3
+else
+  PIP_EXECUTABLE=pip${PYTHON_SYS_VERSION}
 fi
 
+echo "Using pip executable: $PIP_EXECUTABLE"
+
 #
 # First install requirements in install/requirements.txt. Older torch may be
 # installed from the dependency of other models. It will be overridden by