[PATCH v2 2/3] udev.eclass: add udev_hwdb_update function

update the udev hardware database binary using the `systemd-hwdb update`
command. The `udevadm hwdb` has been deprecated upstream.

See-also: https://github.com/systemd/systemd/commit/f8717d2a723cf594617c3acb7e90992c881a3280
Signed-off-by: Lukas Schmelting <[email protected]>
---
 eclass/udev.eclass | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/eclass/udev.eclass b/eclass/udev.eclass
index 7d1c213fa643..98bc1a166e43 100644
--- a/eclass/udev.eclass
+++ b/eclass/udev.eclass
@@ -130,3 +130,18 @@ udev_reload() {
 }
 
 fi
+
+# @FUNCTION: udev_hwdb_update
+# @DESCRIPTION:
+
+# Rebuild the systemd hwdb binary database used by udev for hardware
+# property lookups.  Should be called from pkg_postinst and pkg_postrm
+# in packages installing hwdb files.
+udev_hwdb_update() {
+	if [[ -n ${ROOT} ]]; then
+		return 0
+	fi
+	ebegin "Running systemd-hwdb update to regenerate binary udev hardware database"
+	systemd-hwdb update --root "${ROOT}"
+	eend $?
+}
-- 
2.53.0