I don't know what's preferred, so I opened a merge request on Salsa with
my proposed (admittedly naive) changes. Local testing on a Debian 12.1
install media appears to work fine.
If you'd rather have a normal patch, I've attached one here as well.
diff --git a/debian/dmsetup-udeb.install b/debian/dmsetup-udeb.install
index 365b8c4d3..c7ae7f637 100644
--- a/debian/dmsetup-udeb.install
+++ b/debian/dmsetup-udeb.install
@@ -1 +1,2 @@
+lib/udev/rules.d/*-dm*.rules
sbin/dmsetup
diff --git a/debian/rules b/debian/rules
index f67c52ddf..0fdd7650b 100755
--- a/debian/rules
+++ b/debian/rules
@@ -69,6 +69,9 @@ define CONFARGS.udeb
--with-optimisation="$(CFLAGS_OPT_UDEB)"
--with-lvm1=none
--with-pool=none
+ --with-udev-prefix=/
+ --enable-udev_rules
+ --enable-udev_sync
--disable-app-machineid
--disable-readline
--disable-selinux
