[cip-dev][isar-cip-core][PATCH] initramfs-abrootfs: check if /etc/os-release exists

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

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

If a valid root file system does not contain /etc/os-release the
script aborts before checking other root file systems. This occurs
for example if the boot occurs from a USB stick and a ext4 root
file system exists on internal memory.

Also ensure that IMAGE_UUID and TARGET_IMAGE_UUID are not empty
before comparing to each other.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../initramfs-abrootfs-hook/files/abrootfs.script          | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/recipes-initramfs/initramfs-abrootfs-hook/files/abrootfs.script b/recipes-initramfs/initramfs-abrootfs-hook/files/abrootfs.script
index 23bbfe7..848e829 100644
--- a/recipes-initramfs/initramfs-abrootfs-hook/files/abrootfs.script
+++ b/recipes-initramfs/initramfs-abrootfs-hook/files/abrootfs.script
@@ -35,9 +35,12 @@ find_root_via_image_uuid()
     for part in $partitions; do
         if [ "$(blkid -p "${part}" --match-types novfat -s USAGE -o value)" = "filesystem" ]; then
             mount -o ro -t "$(get_fstype "${part}")" "${part}" "${rootmnt}"
-            . "${rootmnt}/etc/os-release"
+            if [ -e "${rootmnt}/etc/os-release" ]; then
+                . "${rootmnt}/etc/os-release"
+            fi
             umount "${rootmnt}"
-            if [ "${IMAGE_UUID}" = "${TARGET_IMAGE_UUID}" ]; then
+            if [ -n "${IMAGE_UUID}" ] && [ -n "${TARGET_IMAGE_UUID}" ] &&
+                   [ "${IMAGE_UUID}" = "${TARGET_IMAGE_UUID}" ]; then
                 found_root="${part}"
                 break
             fi
-- 
2.35.1