From 5d05111a6ce4038226b6c34907964c2c38e6dc1f Mon Sep 17 00:00:00 2001
From: Andreas Beckmann <anbe@debian.org>
Date: Thu, 23 Jan 2025 02:58:43 +0100
Subject: [PATCH] debian: add kernel_preinst.d hook

On kernel upgrades (w/o version change, but no guarantee that there was
no ABI change), uninstall && unbuild all AUTOINSTALL=yes modules
currently built for the kernel to ensure they get rebuilt by the
kernel_postinst.d hook.
No-op on initial installation of a kernel version.
---
 .gitignore                 |  1 +
 Makefile                   |  2 ++
 debian_kernel_preinst.d.in | 11 +++++++++++
 3 files changed, 14 insertions(+)
 create mode 100644 debian_kernel_preinst.d.in

diff --git a/.gitignore b/.gitignore
index 0bd49a6a..29155b76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ dkms.service
 dkms_common.postinst
 debian_kernel_install.d
 debian_kernel_postinst.d
+debian_kernel_preinst.d
 debian_kernel_prerm.d
 redhat_kernel_install.d
 
diff --git a/Makefile b/Makefile
index d46b8645..c4b3da39 100644
--- a/Makefile
+++ b/Makefile
@@ -40,6 +40,7 @@ GENERATED= \
 	dkms.service \
 	debian_kernel_install.d \
 	debian_kernel_postinst.d \
+	debian_kernel_preinst.d \
 	debian_kernel_prerm.d \
 	redhat_kernel_install.d
 
@@ -82,6 +83,7 @@ install-debian: install
 	install -D -m 0755 debian_kernel_install.d $(DESTDIR)$(KINSTALL)/40-dkms.install
 	install -D -m 0755 debian_kernel_postinst.d $(DESTDIR)$(KCONF)/postinst.d/dkms
 	install -D -m 0755 debian_kernel_postinst.d $(DESTDIR)$(KCONF)/header_postinst.d/dkms
+	install -D -m 0755 debian_kernel_preinst.d $(DESTDIR)$(KCONF)/preinst.d/dkms
 	install -D -m 0755 debian_kernel_prerm.d $(DESTDIR)$(KCONF)/prerm.d/dkms
 
 install-doc:
diff --git a/debian_kernel_preinst.d.in b/debian_kernel_preinst.d.in
new file mode 100644
index 00000000..bfc175d0
--- /dev/null
+++ b/debian_kernel_preinst.d.in
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# This script is triggered when the kernel (linux-image) package is being
+# installed/upgraded.  We're passed the version of the kernel being installed.
+inst_kern=$1
+
+if command -v dkms > /dev/null; then
+    dkms kernel_preinst -k "$inst_kern"
+fi
+
+exit 0