upgrade_oniro.py: add argument parsing

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

scripts/upgrade_oniro.py

@@ -22,6 +22,7 @@
 #   3.2. Check if all the layers in the sample of Oniro are checked out in the correct state.
 #   3.4. If the build directory is non-empty check if bblayers.conf have some additional layers, if positive flag them for the config update.
 #   3.5. Flag all the .bbappends for update
+#   3.6 Check if the flavor is correct if the conf dir is specified
 #
 # 4. Pre-upgrade backup to ensure that if something goes wrong we can restore a good state of the build. 
 #       Option to also backup the build (tmp dir excluded) if the build directory is not empty.
@@ -36,7 +37,38 @@
 #   5.6. Build the target
 # 6. In case of error let the user know that they can restore the old version using this tool
 # 7. In case of a successful upgrade print/dump some additional information about the upgrade (CVE diff, buildhistory, ...)
+#
+# TODO think about a way to let the user know BEFORE the upgrade what changed so (s)he can choose. (maybe you can use git diff --compact-summary)
+
+
+import argparse
+import pathlib
+
+script_description = "[WIP] A tool to upgrade to a newer version of Oniro"
+
+def arg_parsing():
+    parser = argparse.ArgumentParser(description=script_description)
+
+    # TODO a choice could be added in the version by checking all the tags of Oniro
+    parser.add_argument("-tv", "--target-version", type=str, required=True,
+                        help="Specify the target version of Oniro you want to upgrade to")
+    parser.add_argument("-d", "--build-directory", type=pathlib.Path, required=True,
+                        help="Path to the build directory you want to use (can be non-existent)")
+    # TODO a choice could be added in the machine
+    parser.add_argument("-m", "--machine", type=str, default="qemux86-64",
+                        help="The target machine for the Oniro build. (qemux86-64 by default)")
+    # TODO the option gathering can be automated by looking at oniro/flavours/
+    parser.add_argument("-f", "--flavour", type=str, choices=["linux", "zephyr", "freertos"], default="linux",
+                        help="The flavor for the Oniro build. (linux by default)")
+    # TODO the option gathering can be automated by looking at oniro/meta-oniro-core/recipes-core/images
+    parser.add_argument("-i", "--image", type=str, default="oniro-image-base",
+                        choices=["oniro-image-base", "oniro-image-base-tests", "oniro-image-extra", "oniro-image-extra-tests"],
+                        help = "The image that will be built to check if the upgrade is successful (oniro-image-base by default)")
+    parser.add_argument("-c", "--conf-directory", type=pathlib.Path,
+                        help="Path to the config directory you want to use. If omitted the default configs will be use.")
+    
 
+    return parser.parse_args()
 
 if __name__ == "__main__":
-    print("test")
+    print(arg_parsing())