[PATCH v2] 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 were 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: Additional services are enabled only. Services already enabled
during the package installation won't be changed.

Opt-out: `ROOTFS_POSTPROCESS_COMMAND:remove = "image_postprocess_populate_systemd_preset"`

Signed-off-by: Alexander Heinisch <alexander.heinisch@siemens.com>
---
 RECIPE-API-CHANGELOG.md                       | 18 ++++++++++++++++++
 meta/classes/image-postproc-extension.bbclass |  5 +++++
 2 files changed, 23 insertions(+)

diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md
index 8468717d..fb9ad4f3 100644
--- a/RECIPE-API-CHANGELOG.md
+++ b/RECIPE-API-CHANGELOG.md
@@ -727,3 +727,21 @@ Changes in next
 
 This was never documented and never had practical relevance. `oci-archive` is
 the useful OCI image format that can be imported, e.g., by podman.
+
+### Populate systemd units based on presets during image postprocessing
+
+By default population of the presets is automatically done by systemd
+on first-boot.
+
+There were 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**: Additional services are enabled only. Services already enabled
+during the package installation won't be changed.
+
+Opt-out: `ROOTFS_POSTPROCESS_COMMAND:remove = "image_postprocess_populate_systemd_preset"`
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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