Implement basic passwd parser

main.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import argparse
+import sys
+import json
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Convert a passwd file to a directory of systemd JSON user records.",
+    )
+    parser.add_argument(
+        "passwd_file",
+        help="Path to the passwd file.",
+    )
+    parser.add_argument(
+        "output_dir",
+        help="Path to a directory to store json user records.",
+    )
+    args = parser.parse_args()
+
+    parsed_users = parse_passwd_file(args.passwd_file)
+
+    for user in parsed_users:
+        print(json.dumps(user, indent=2))
+
+def parse_passwd_file(passwd_file):
+    users = []
+    with open(passwd_file, "r") as f:
+        for line in f:
+            if line.startswith("#") or not line.strip():
+                continue
+            parts = line.strip().split(":")
+            if len(parts) < 7:
+                print(f"Warning: Skipping malformed line: {line.strip()}", file=sys.stderr)
+                continue
+            user = {
+                "name": parts[0],
+                "uid": int(parts[2]),
+                "gid": int(parts[3]),
+                "gecos": parse_gecos(parts[4]),
+                "home": parts[5],
+                "shell": parts[6],
+            }
+            users.append(user)
+    return users
+
+def parse_gecos(gecos):
+    parts = gecos.split(",")
+    return {
+        "full_name": parts[0] if len(parts) > 0 else "",
+        "room_number": parts[1] if len(parts) > 1 else "",
+        "work_phone": parts[2] if len(parts) > 2 else "",
+        "home_phone": parts[3] if len(parts) > 3 else "",
+        "other": parts[4] if len(parts) > 4 else "",
+    }
+
+if __name__ == "__main__":
+    main()