[cip-dev][isar-cip-core][PATCH] swupdate-handler-roundrobin: Add link for handler search path

[Quirin Gylstorff <Quirin.Gylstorff@siemens.com>]

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

The lua version which is used to search for additional handler is
hard coded in SWUpdate and debian salsa[1].

To support multiple distribution with different lua versions add
the variables SWUPDATE_LUA_VERSION and SWUPDATE_ADDITIONAL_LUA_VERSIONS.

SWUPDATE_LUA_VERSION defines the main version and for all space
seperated entries in SWUPDATE_ADDITIONAL_LUA_VERSIONS a symbolic link
is generated.

[1]: https://salsa.debian.org/debian/swupdate/-/blob/6ccd44a8539ebb880bf0dac408d5db5de7e2de99/debian/rules#L13

This fixes issue #102 SWUpdate failed to install update on bookworm
amd64 image.

Reported-by: Adithya Balakumar <Adithya.Balakumar@toshiba-tsip.com>
Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../swupdate-handler-roundrobin_0.1.bb           | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/recipes-core/swupdate-handler-roundrobin/swupdate-handler-roundrobin_0.1.bb b/recipes-core/swupdate-handler-roundrobin/swupdate-handler-roundrobin_0.1.bb
index b39278e..95ceedd 100644
--- a/recipes-core/swupdate-handler-roundrobin/swupdate-handler-roundrobin_0.1.bb
+++ b/recipes-core/swupdate-handler-roundrobin/swupdate-handler-roundrobin_0.1.bb
@@ -20,12 +20,22 @@ SWUPDATE_LUASCRIPT = "swupdate-handler-roundrobin/swupdate_handlers_roundrobin.l
 SWUPDATE_ROUND_ROBIN_HANDLER_CONFIG ?= "swupdate.handler.${SWUPDATE_BOOTLOADER}.ini"
 SRC_URI += "${@('file://' + d.getVar('SWUPDATE_ROUND_ROBIN_HANDLER_CONFIG')) if d.getVar('SWUPDATE_BOOTLOADER') else ''}"
 
-# lua version 5.2 is currently hard coded in swupdate @ debian salsa
+# The lua version used by swupdate to search for additional handler is hard coded in debian/rules
+# see https://salsa.debian.org/debian/swupdate/-/blob/6ccd44a8539ebb880bf0dac408d5db5de7e2de99/debian/rules#L13
+SWUPDATE_LUA_VERSION ??= "5.4"
+SWUPDATE_ADDITIONAL_LUA_VERSIONS ??= "5.3"
+
+do_prepare_build:append() {
+    for lua_version in ${SWUPDATE_ADDITIONAL_LUA_VERSIONS}; do
+        echo "usr/share/lua/${SWUPDATE_LUA_VERSION} usr/share/lua/$lua_version" >> ${WORKDIR}/${PN}-${PV}/debian/${PN}.links
+    done
+}
+
 do_install[cleandirs] = "${D}/etc \
-                         ${D}/usr/share/lua/5.3"
+                         ${D}/usr/share/lua/${SWUPDATE_LUA_VERSION}"
 do_install() {
     if [ -e ${WORKDIR}/${SWUPDATE_LUASCRIPT} ]; then
-        install -m 0644 ${WORKDIR}/${SWUPDATE_LUASCRIPT} ${D}/usr/share/lua/5.3/swupdate_handlers.lua
+        install -m 0644 ${WORKDIR}/${SWUPDATE_LUASCRIPT} ${D}/usr/share/lua/${SWUPDATE_LUA_VERSION}/swupdate_handlers.lua
     fi
     if [ -e ${WORKDIR}/${SWUPDATE_ROUND_ROBIN_HANDLER_CONFIG} ]; then
        install -m 0644 ${WORKDIR}/${SWUPDATE_ROUND_ROBIN_HANDLER_CONFIG} ${D}/etc/swupdate.handler.ini
-- 
2.43.0