Re: [PATCH] classes/image-postproc-extension: Remove /etc/machine-id

[Henning Schild <henning.schild@siemens.com>]

Am Tue, 19 Apr 2022 17:36:40 +0200
schrieb "Q. Gylstorff" <Quirin.Gylstorff@siemens.com>:

> From: kas <kas@example.com>
> 
> In a read-only system the machine id should be deleted or 
> set to `unitialized\n`[1]. 
> 
> Systemd will generate a new machine-id during the first boot. 
> In the case of a read-only root file system Systemd generates a mount
> point with the machine id. If an overlay for /etc is used this
> creates a mount conflict. To avoid the conflict between the overlay
> filesystem and systemd /etc/machine-id mount point deleted the file
> /etc/machine-id.
> 
> [1]: https://systemd.io/BUILDING_IMAGES/

This is full of good stuff which should probably go into Isar. i.e.
other files to remove, and systemd-repart systemd-growfs

Or systemd-makefs for additional partitions. While wic can do that as
well, you could quickly run into uuid duplication across devices.

Henning

> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
> ---
>  meta/classes/image-postproc-extension.bbclass | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/meta/classes/image-postproc-extension.bbclass
> b/meta/classes/image-postproc-extension.bbclass index
> ca520273..0c412c0d 100644 ---
> a/meta/classes/image-postproc-extension.bbclass +++
> b/meta/classes/image-postproc-extension.bbclass @@ -57,7 +57,7 @@
> 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
> '${IMAGE_ROOTFS}/var/lib/dbus/machine-id'
> -    sudo install -m 644 '/dev/null' '${IMAGE_ROOTFS}/etc/machine-id'
> +    sudo rm -f '${IMAGE_ROOTFS}/etc/machine-id'
>  }
>  
>  ROOTFS_POSTPROCESS_COMMAND =+ "image_postprocess_sshd_key_regen"