[RFC PATCH v3 08/10] Add dracut module helper

["'Quirin Gylstorff' via isar-users" <isar-users@googlegroups.com>]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

This adds a helper similar to initramfs-hook to generate a dracut
module.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../dracut-module/dracut-module.inc           | 41 +++++++++++++++++++
 .../dracut-module/files/module-setup.sh.tmpl  | 20 +++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 meta/recipes-initramfs/dracut-module/dracut-module.inc
 create mode 100644 meta/recipes-initramfs/dracut-module/files/module-setup.sh.tmpl

diff --git a/meta/recipes-initramfs/dracut-module/dracut-module.inc b/meta/recipes-initramfs/dracut-module/dracut-module.inc
new file mode 100644
index 00000000..54071105
--- /dev/null
+++ b/meta/recipes-initramfs/dracut-module/dracut-module.inc
@@ -0,0 +1,41 @@
+#
+# Copyright (c) Siemens AG, 2025
+#
+# Authors:
+#  Quirin Gylstorff <quirin.gylstorff@siemens.com>
+#
+# SPDX-License-Identifier: MIT
+#
+
+inherit dpkg-raw
+
+FILESPATH:append := ":${FILE_DIRNAME}/files"
+
+DPKG_ARCH = "all"
+
+DRACUT_MODULE_SETUP = "module-setup.sh"
+SRC_URI += "file://${DRACUT_MODULE_SETUP}.tmpl"
+
+DRACUT_REQUIRED_BINARIES = ""
+DRACUT_MODULE_DEPENDENCIES = ""
+DRACUT_MODULE_NO ??= "50"
+DRACUT_MODULE_NAME ?= "${@ d.getVar('PN')[7:] if d.getVar('PN').startswith('dracut-') else d.getVAR('PN')}"
+
+TEMPLATE_FILES:append = " \
+    ${DRACUT_MODULE_SETUP}.tmpl \
+    "
+
+TEMPLATE_VARS:append = " \
+    DRACUT_REQUIRED_BINARIES \
+    DRACUT_MODULE_DEPENDENCIES \
+    "
+DEBIAN_DEPENDS = "dracut-core"
+DRACUT_MODULE_PATH = "${D}/usr/lib/dracut/modules.d/${DRACUT_MODULE_NO}${DRACUT_MODULE_NAME}/"
+do_install[cleandirs] += "${DRACUT_MODULE_PATH}"
+do_install:append() {
+    install -m 770 ${WORKDIR}/${DRACUT_MODULE_SETUP} ${DRACUT_MODULE_PATH}
+    if [ -f ${WORKDIR}/install.sh ]; then
+        cat ${WORKDIR}/install.sh >> ${DRACUT_MODULE_PATH}/${DRACUT_MODULE_SETUP}
+    fi
+}
+
diff --git a/meta/recipes-initramfs/dracut-module/files/module-setup.sh.tmpl b/meta/recipes-initramfs/dracut-module/files/module-setup.sh.tmpl
new file mode 100644
index 00000000..46477cf4
--- /dev/null
+++ b/meta/recipes-initramfs/dracut-module/files/module-setup.sh.tmpl
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# called by dracut
+check() {
+
+    # If the binary(s) requirements are not fulfilled the module can't be installed.
+    require_binaries \
+        ${DRACUT_REQUIRED_BINARIES} \
+        || return 1
+
+    return 0
+
+}
+# Module dependency requirements.
+depends() {
+    echo "${DRACUT_MODULE_DEPENDENCIES}"
+    return 0
+
+}
+
-- 
2.51.0

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