build: Add script to update the unsupported devices from wiki

Avoid some more manual labor

scripts/sync-unsupported-devices.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+#
+# Update the hardcoded allowlist of currently unsupported devices in
+# fprint-list-udev-hwdb.c from the libfprint wiki page.
+
+import argparse
+import re
+import sys
+from urllib.request import urlopen
+
+DEFAULT_URL = (
+    "https://gitlab.freedesktop.org/libfprint/wiki/-/wikis/Unsupported-Devices.md"
+)
+
+ID_RE = re.compile(r"\|.*([0-9a-fA-F]{4}):([0-9a-fA-F]{4}).*\|.*")
+
+BEGIN_MARKER = "  /* --- BEGIN GENERATED IDS --- */\n"
+END_MARKER = "  /* --- END GENERATED IDS --- */\n"
+
+
+def fetch(url):
+    try:
+        with urlopen(url) as response:
+            return response.read().decode("utf-8")
+    except OSError as exc:
+        print(f"Could not download {url}: {exc}", file=sys.stderr)
+        sys.exit(77)
+
+
+def parse_entries(text):
+    devices = set()
+    for line in text.splitlines():
+        match = ID_RE.match(line)
+        if match:
+            devices.add((match.group(1).lower(), match.group(2).lower()))
+    return [f"  {{ .vid = 0x{vid}, .pid = 0x{pid} }}," for vid, pid in sorted(devices)]
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("source_file", help="Path to hwdb file")
+    parser.add_argument("--url", default=DEFAULT_URL, help="Wiki page URL")
+    args = parser.parse_args()
+
+    entries = parse_entries(fetch(args.url))
+    if not entries:
+        sys.exit("No device ids found on the wiki page")
+
+    with open(args.source_file, "r", encoding="utf-8") as f:
+        content = f.read()
+
+    before, begin, rest = content.partition(BEGIN_MARKER)
+    _, end, after = rest.partition(END_MARKER)
+    if not begin or not end:
+        sys.exit("Could not locate generated id markers in " + args.source_file)
+
+    block = BEGIN_MARKER + "\n".join(entries) + "\n" + END_MARKER
+    new_content = before + block + after
+
+    if new_content == content:
+        print("allowlist_id_table is already up to date")
+        return
+
+    with open(args.source_file, "w", encoding="utf-8") as f:
+        f.write(new_content)
+
+    print(f"Updated allowlist_id_table with {len(entries)} entries")
+
+
+if __name__ == "__main__":
+    main()