From 5cd372993f4626a799cd570e6e3bd4cdffaa50ad Mon Sep 17 00:00:00 2001
From: Pavel Valena <pvalena@redhat.com>
Date: Tue, 25 Apr 2023 14:56:59 +0200
Subject: [PATCH] feat(hwdb): install hwdb on demand when module is needed

Adding a module to install hwdb. Further extensions might make only selected
part of hwdb installable, to save space. The module is not included by default.

Including the module adds 2MB of compressed data (on Fedora, the file has 12MB).

hwdb is needed in case of custom HW, like a keyboard/mouse or various interfaces.

Original PR: https://github.com/dracutdevs/dracut/pull/1681

(Cherry-picked commit: 062e739d89543a38d4b3e2cab155912bc4bf9e56)

Resolves: #1968118
---
 dracut.sh                        |  6 ++++++
 dracut.spec                      |  1 +
 modules.d/95hwdb/module-setup.sh | 26 ++++++++++++++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100755 modules.d/95hwdb/module-setup.sh

diff --git a/dracut.sh b/dracut.sh
index f58559e8..869b90b0 100755
--- a/dracut.sh
+++ b/dracut.sh
@@ -1302,6 +1302,12 @@ if ! [[ -d "$udevdir" ]]; then
     [[ -e /usr/lib/udev/collect ]] && udevdir=/usr/lib/udev
 fi
 
+[[ -d $udevconfdir ]] \
+    || udevconfdir="$(pkg-config udev --variable=udevconfdir 2>/dev/null)"
+if ! [[ -d "$udevconfdir" ]]; then
+    [[ -d /etc/udev ]] && udevconfdir=/etc/udev
+fi
+
 [[ -d $systemdutildir ]] \
     || systemdutildir=$(pkg-config systemd --variable=systemdutildir 2>/dev/null)
 
diff --git a/dracut.spec b/dracut.spec
index 90fa903a..a417f780 100644
--- a/dracut.spec
+++ b/dracut.spec
@@ -365,6 +365,7 @@ echo 'dracut_rescue_image="yes"' > $RPM_BUILD_ROOT%{dracutlibdir}/dracut.conf.d/
 %{dracutlibdir}/modules.d/91crypt-loop
 %{dracutlibdir}/modules.d/95debug
 %{dracutlibdir}/modules.d/95fstab-sys
+%{dracutlibdir}/modules.d/95hwdb
 %{dracutlibdir}/modules.d/95lunmask
 %{dracutlibdir}/modules.d/95nvmf
 %{dracutlibdir}/modules.d/95resume
diff --git a/modules.d/95hwdb/module-setup.sh b/modules.d/95hwdb/module-setup.sh
new file mode 100755
index 00000000..16365377
--- /dev/null
+++ b/modules.d/95hwdb/module-setup.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+# This file is part of dracut.
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+check() {
+    return 255
+}
+
+# called by dracut
+install() {
+    local hwdb_bin
+
+    # systemd-hwdb ships the file in /etc, with /usr/lib as an alternative.
+    # Therefore consider this location as preferred for configuration.
+    hwdb_bin="${udevdir}"/hwdb.bin
+
+    if [[ ! -r "${hwdb_bin}" ]]; then
+      hwdb_bin="${udevconfdir}"/hwdb.bin
+    fi
+
+    if [[ $hostonly ]]; then
+        inst_multiple -H "${hwdb_bin}"
+    else
+        inst_multiple "${hwdb_bin}"
+    fi
+}