systemd-boot: restore reproducibility

(From OE-Core rev: fde5147206ae82d11819fcc23fbe4fc2f94ea52b)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd.inc

@@ -17,6 +17,7 @@ LIC_FILES_CHKSUM = "file://LICENSE.GPL2;md5=751419260aa954499f7abaabaa882bbe \
 SRCREV = "402280118fe082122437638f53a0019c4aea81aa"
 SRCBRANCH = "v250-stable"
 SRC_URI = "git://github.com/systemd/systemd-stable.git;protocol=https;branch=${SRCBRANCH} \
-"
+           file://0001-src-fundamental-list-fundamental_source_paths-using-.patch \
+           "
 
 S = "${WORKDIR}/git"

meta/recipes-core/systemd/systemd/0001-src-fundamental-list-fundamental_source_paths-using-.patch

@@ -0,0 +1,28 @@
+From 8e882df78ede98c15a3f2567fabebfde1d774b02 Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex@linutronix.de>
+Date: Fri, 7 Jan 2022 21:20:15 +0100
+Subject: [PATCH] src/fundamental: list fundamental_source_paths using relative
+ paths
+
+Otherwise, the compiler takes the full path to the source file
+and writes it into the binary output, breaking reproducibility.
+
+Upstream-Status: Submitted [https://github.com/systemd/systemd/pull/22047]
+Signed-off-by: Alexander Kanavin <alex@linutronix.de>
+---
+ src/fundamental/meson.build | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/fundamental/meson.build b/src/fundamental/meson.build
+index 287f0fe36a..954bdf150b 100644
+--- a/src/fundamental/meson.build
++++ b/src/fundamental/meson.build
+@@ -20,7 +20,7 @@ sources = '''
+ # for sd-boot
+ fundamental_source_paths = []
+ foreach source : sources
+-        fundamental_source_paths += meson.current_source_dir() / source
++        fundamental_source_paths += '../../fundamental/' + source
+ endforeach
+ 
+ # for libbasic