[PATCH] image-postproc-extension: fix machine-id file being written empty

["'Badrikesh Prusty' via isar-users" <isar-users@googlegroups.com>]

The pipe operation was lost when passing data to run_in_chroot because
run_privileged_heredoc consumes stdin for the heredoc script, resulting
in an empty /etc/machine-id file.
Move the pipe operation inside the chroot environment to fix it. This
ensures /etc/machine-id is properly written with either "uninitialized"
(systemd >= 247) or empty string (systemd < 247).

Fixes: 14acf490 ("introduce wrappers for privileged execution")
Signed-off-by: Badrikesh Prusty <badrikesh.prusty@siemens.com>
---
 meta/classes-recipe/image-postproc-extension.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes-recipe/image-postproc-extension.bbclass b/meta/classes-recipe/image-postproc-extension.bbclass
index 59128c2a..9e37a65b 100644
--- a/meta/classes-recipe/image-postproc-extension.bbclass
+++ b/meta/classes-recipe/image-postproc-extension.bbclass
@@ -63,7 +63,7 @@ image_postprocess_machine_id() {
     if dpkg --compare-versions "$SYSTEMD_VERSION" "lt" "247"; then
         MACHINE_ID=""
     fi
-    echo "$MACHINE_ID" | run_in_chroot ${IMAGE_ROOTFS} tee /etc/machine-id
+    run_in_chroot ${IMAGE_ROOTFS} sh -c "echo $MACHINE_ID | tee /etc/machine-id"
     run_privileged rm -f '${IMAGE_ROOTFS}/var/lib/dbus/machine-id'
 }
 
-- 
2.39.5

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