libfprint/fprint-list-metainfo: Generate AppStream metainfo

UI tools can use this information to see what package provides support
for specific devices, so let's provide the data since we have it.

libfprint/fprint-list-metainfo.c

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2025 Marco Trevisan <marco.trevisan@canonical.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "glib.h"
+#include "fpi-context.h"
+#include "fpi-device.h"
+
+#define METAINFO_BASE \
+  "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" \
+  "<component>\n" \
+  "  <id>org.freedesktop.libfprint</id>\n" \
+  "  <name>libfprint</name>\n" \
+  "  <metadata_license>CC0-1.0</metadata_license>\n" \
+  "  <project_license>LGPL-2.1-or-later</project_license>\n" \
+  "  <url type=\"homepage\">https://fprint.freedesktop.org</url>\n" \
+  "  <url type=\"vcs-browser\">https://gitlab.freedesktop.org/libfprint/libfprint</url>\n" \
+  "  <url type=\"help\">https://fprint.freedesktop.org/libfprint-dev</url>\n" \
+  "  <url type=\"bugtracker\">https://gitlab.freedesktop.org/libfprint/libfprint/-/issues</url>\n" \
+  "  <summary>Async fingerprint readers library</summary>\n" \
+  "  <description>\n" \
+  "    <p>\n" \
+  "      The fprint project aims to support for consumer fingerprint reader devices.\n" \
+  "    </p>\n" \
+  "  </description>\n" \
+  "  <provides>\n" \
+  "%s\n" \
+  "  </provides>\n" \
+  "</component>\n"
+
+static int
+driver_compare (gconstpointer p1, gconstpointer p2)
+{
+  g_autoptr(FpDeviceClass) cls1 = g_type_class_ref (*(GType *) p1);
+  g_autoptr(FpDeviceClass) cls2 = g_type_class_ref (*(GType *) p2);
+
+  return g_strcmp0 (cls1->id, cls2->id);
+}
+
+static void
+usb_driver_devices_append (GPtrArray           *devices_list,
+                           const FpDeviceClass *cls)
+{
+  const FpIdEntry *entry;
+
+  if (cls->type != FP_DEVICE_TYPE_USB)
+    return;
+
+  for (entry = cls->id_table; entry->vid != 0; entry++)
+    {
+      if (entry->vid == 0 || entry->pid == 0)
+        continue;
+
+      g_ptr_array_add (devices_list,
+                       g_strdup_printf ("v%04xp%04x", entry->vid, entry->pid));
+    }
+}
+
+int
+main (void)
+{
+  g_autoptr(GPtrArray) devices_list = g_ptr_array_new_with_free_func (g_free);
+  g_autoptr(GArray) drivers = fpi_get_driver_types ();
+  g_autoptr(GString) provided_modules = g_string_new (NULL);
+  g_autoptr(GError) error = NULL;
+
+  g_array_sort (drivers, driver_compare);
+
+  for (guint i = 0; i < drivers->len; ++i)
+    {
+      GType driver = g_array_index (drivers, GType, i);
+      g_autoptr(FpDeviceClass) cls = g_type_class_ref (driver);
+
+      if (cls->type != FP_DEVICE_TYPE_USB)
+        continue;
+
+      usb_driver_devices_append (devices_list, cls);
+    }
+
+  for (guint i = 0; i < devices_list->len; ++i)
+    {
+      const char *device_id = g_ptr_array_index (devices_list, i);
+
+      g_string_append (provided_modules, "    ");
+      g_string_append_printf (provided_modules, "<modalias>usb:%s*</modalias>",
+                              device_id);
+
+      if (i < devices_list->len - 1)
+        g_string_append_c (provided_modules, '\n');
+    }
+
+  g_print (METAINFO_BASE, provided_modules->str);
+}

libfprint/meson.build

@@ -327,6 +327,21 @@ udev_hwdb_generator = custom_target('udev-hwdb',
     install: false,
 )
 
+metainfo = executable('fprint-list-metainfo',
+    'fprint-list-metainfo.c',
+    dependencies: libfprint_private_dep,
+    link_with: libfprint_drivers,
+    install: false)
+
+metainfo_generator = custom_target('metainfo',
+    output: 'org.freedesktop.libfprint.metainfo.xml',
+    depend_files: drivers_sources,
+    capture: true,
+    command: [ metainfo ],
+    install: true,
+    install_dir: datadir / 'metainfo'
+)
+
 if install_udev_rules
     udev_rules = executable('fprint-list-udev-rules',
         'fprint-list-udev-rules.c',