Implement basic passwd parser

main.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+from pathlib import Path
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Convert a passwd file to a directory of systemd JSON user records.",
+    )
+    parser.add_argument(
+        "passwd_file",
+        type=Path,
+        help="Path to the passwd file.",
+    )
+    parser.add_argument(
+        "output_dir",
+        type=Path,
+        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: Path) -> list[dict]:
+    users = []
+    with passwd_file.open("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()}")
+                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: str) -> dict:
+    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()

test.passwd

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+# Default system users
+
+root:x:0:0:root:/root:/bin/bash
+daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
+bin:x:2:2:bin:/bin:/usr/sbin/nologin
+sys:x:3:3:sys:/dev:/usr/sbin/nologin
+sync:x:4:65534:sync:/bin:/bin/sync
+games:x:5:60:games:/usr/games:/usr/sbin/nologin
+man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
+lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
+mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
+news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
+uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
+proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
+www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
+backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
+list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
+irc:x:39:39:ircd:/run/ircd:/usr/sbin/nologin
+gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
+nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
+_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
+systemd-timesync:x:101:101:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
+systemd-network:x:102:103:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
+systemd-resolve:x:103:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
+messagebus:x:104:105::/nonexistent:/usr/sbin/nologin
+avahi:x:105:109:Avahi mDNS daemon,,,:/run/avahi-daemon:/usr/sbin/nologin
+saned:x:106:112::/var/lib/saned:/usr/sbin/nologin
+xrdp:x:107:114::/run/xrdp:/usr/sbin/nologin
+
+# Custom users
+user1:x:1000:1000:user1,,,:/home/user1:/bin/bash
+user2:x:1001:1001:user2,,,+81 123 4567 8900:/home/user2:/bin/bash
+user3:x:1002:1002:user3,Heimdal,,:/home/user3:/bin/zsh