Added subrepo checkout script

bin/subrepo_checkout.py

+#!/usr/bin/env python3
+#------------------------------------------------------------------------------------
+# SProject Subrepository Checkout Script
+# A joint work commissioned on behalf of SoC Labs, under Arm Academic Access license.
+#
+# Contributors
+#
+# David Mapstone (d.a.mapstone@soton.ac.uk)
+# Copyright (c) 2023, SoC Labs (www.soclabs.org)
+#------------------------------------------------------------------------------------
+import argparse
+import os
+
+class git_repo():
+    def __init__(self, directory, branch):
+        self.directory = directory
+        self.branch    = branch
+        
+def read_branchfile(branchfile):
+    f = open(branchfile, "r")
+    filelines = f.readlines()
+    f.close()
+    sub_repos = []
+    for line in filelines:
+        if not line.startswith("#"):
+            repo = line.replace(" ","").split(":")
+            if len(repo) == 2:
+                sub_repos.append(git_repo(repo[0],repo[1]))
+            
+    return sub_repos
+    
+def repo_checkout(directory, branch):
+    os.system(f"cd {directory}; git checkout {branch}")
+    
+if __name__ == "__main__":
+    # Capture Arguments from Command Line
+    parser = argparse.ArgumentParser(description='Checks out branches for subrepositories in a project')
+    parser.add_argument("-b", "--branchfile", type=str, help="File to Read in Branches from")
+    parser.add_argument("-t", "--topproject", type=str, help="Top-level directory of Project")
+    args = parser.parse_args()
+    sub_repos = read_branchfile(args.branchfile)
+    for repo in sub_repos:
+        repo_checkout(repo.directory, repo.branch)