From 71b1c8a106b6400d644cd40f6ec2e38e7268747c Mon Sep 17 00:00:00 2001
From: hygienic-books <hygienic-books@tentic.net>
Date: Wed, 16 Sep 2026 09:05:13 +0200
Subject: [PATCH] build(hook): wire APT package action callbacks

Install the APT configuration fragment used to invoke the snapshot
helper before dpkg processes package files.

Request protocol version 3 and a dedicated information file descriptor so
the helper can classify package installations, upgrades, downgrades, and
removals without attempting to infer actions from the apt command line.
---
 90apt-zfs-snapshot.conf | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 90apt-zfs-snapshot.conf

diff --git a/90apt-zfs-snapshot.conf b/90apt-zfs-snapshot.conf
new file mode 100644
index 0000000..a1a6101
--- /dev/null
+++ b/90apt-zfs-snapshot.conf
@@ -0,0 +1,7 @@
+# APT sends the package action list to the helper before invoking dpkg.
+DPkg::Tools::options::/usr/local/sbin/apt-zfs-snapshot::Version "3";
+DPkg::Tools::options::/usr/local/sbin/apt-zfs-snapshot::InfoFD "3";
+DPkg::Pre-Install-Pkgs
+{
+    "/usr/local/sbin/apt-zfs-snapshot";
+};