[PATCH] image-postproc-extension: empty mechine-id

["Su, Bao Cheng" <baocheng.su@siemens.com>]

From: Su Bao Cheng <baocheng.su@siemens.com>
Date: Thu, 4 Jul 2019 15:52:17 +0800
Subject: [PATCH] image-postproc-extension: empty mechine-id
To: isar-users@googlegroups.com

According to manpage of debian machine-id @
https://manpages.debian.org/buster/systemd/machine-id.5.en.html,
/etc/machine-id should be empty instead of removing.

Also according to above manpage, the dbus machine-id is copied to
/etc/machine-id if systemd machine-id is empty. However, the dbus
machine-id is also created during isar building, which stays the same
for every machine using the same image.

So here instead of removing, empty this file, and the mechine id will
be regenerated at the first boot. Also remove the dbus machine-id to
prevent copying.

Signed-off-by: Su Bao Cheng <baocheng.su@siemens.com>
---
 meta/classes/image-postproc-extension.bbclass | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/classes/image-postproc-extension.bbclass b/meta/classes/image-postproc-extension.bbclass
index 495eae6..96f5ad6 100644
--- a/meta/classes/image-postproc-extension.bbclass
+++ b/meta/classes/image-postproc-extension.bbclass
@@ -49,5 +49,7 @@ image_postprocess_mark() {
 ROOTFS_POSTPROCESS_COMMAND =+ "image_postprocess_machine_id"
 image_postprocess_machine_id() {
     # systemd(1) takes care of recreating the machine-id on first boot
+    sudo rm -f '${IMAGE_ROOTFS}/var/lib/dbus/machine-id'
     sudo rm -f '${IMAGE_ROOTFS}/etc/machine-id'
+    sudo install -m 644 '/dev/null' '${IMAGE_ROOTFS}/etc/machine-id'
 }
-- 
2.17.1