[PATCH] classes/image-postproc: Enable systemd units based on systemd presets

["alexander.heinisch via isar-users" <isar-users@googlegroups.com>]

From: Alexander Heinisch <alexander.heinisch@siemens.com>

By default population of the presets is automatically done by systemd
on first-boot.
There are several issues with that:
1. The rootfs we get as a build artifact does not reflect the actual
system running in the field.
2. For setups without writeable /etc this fails. With that addition
it happens already at build time. Note we are only enabling additional
services, so services enabled during the package installation won't be
changed.

Signed-off-by: Alexander Heinisch <alexander.heinisch@siemens.com>
---
 meta/classes/image-postproc-extension.bbclass | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/meta/classes/image-postproc-extension.bbclass b/meta/classes/image-postproc-extension.bbclass
index 991bac4c..269b86c0 100644
--- a/meta/classes/image-postproc-extension.bbclass
+++ b/meta/classes/image-postproc-extension.bbclass
@@ -95,3 +95,8 @@ image_posprocess_disable_systemd_firstboot() {
         fi
     fi
 }
+
+ROOTFS_POSTPROCESS_COMMAND =+ "image_postprocess_populate_systemd_preset"
+image_postprocess_populate_systemd_preset() {
+    sudo chroot '${ROOTFSDIR}' systemctl preset-all --preset-mode="enable-only"
+}
-- 
2.39.5

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