[one-cmds] Introduce onelib/backends (Samsung#10766)

This will introduce onelib/backends for common one commands backend list.

ONE-DCO-1.0-Signed-off-by: SaeHie Park <[email protected]>

compiler/one-cmds/CMakeLists.txt

@@ -113,7 +113,8 @@ install(FILES ${MODEL2NNPKG}
               RENAME "model2nnpkg")
 
 # make python directory
-set(ONE_PYTHON_FILES constant.py
+set(ONE_PYTHON_FILES backends.py
+                     constant.py
                      export_constant.py
                      make_cmd.py
                      CfgRunner.py

compiler/one-cmds/onelib/backends.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2023 Samsung Electronics Co., Ltd. All Rights Reserved
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import glob
+import ntpath
+import os
+"""
+[one hierarchy]
+one
+├── backends
+├── bin
+├── doc
+├── include
+├── lib
+├── optimization
+└── test
+
+The list where `one-XXXX` finds its backends
+- `bin` folder where `one-XXXX` exists
+- `backends` folder
+
+NOTE If there are backends of the same name in different places,
+    the closer to the top in the list, the higher the priority.
+"""
+
+
+def get_list(cmdname):
+    dir_path = os.path.dirname(os.path.realpath(__file__))
+    backend_set = set()
+
+    # bin folder
+    files = [f for f in glob.glob(dir_path + '/../*-' + cmdname)]
+    # backends folder
+    files += [
+        f
+        for f in glob.glob(dir_path + '/../../backends/**/*-' + cmdname, recursive=True)
+    ]
+    # TODO find backends in `$PATH`
+
+    backends_list = []
+    for cand in files:
+        base = ntpath.basename(cand)
+        if (not base in backend_set) and os.path.isfile(cand) and os.access(
+                cand, os.X_OK):
+            backend_set.add(base)
+            backends_list.append(cand)
+
+    return backends_list
+
+
+def search_driver(driver):
+    dir_path = os.path.dirname(os.path.realpath(__file__))
+
+    # CASE 1: one/bin/{driver} is found
+    driver_path = dir_path + '/../' + driver
+    if os.path.isfile(driver_path) and os.access(driver_path, os.X_OK):
+        return driver_path
+
+    # CASE 2: one/backends/**/bin/{driver} is found
+    for driver_path in glob.glob(
+            dir_path + '/../../backends/**/bin/' + driver, recursive=True):
+        if os.path.isfile(driver_path) and os.access(driver_path, os.X_OK):
+            return driver_path
+
+    # CASE 3: {driver} is found in nowhere
+    return None