Re: [RFC PATCH 5/5] initramfs: allow to set the generator command

["'Jan Kiszka' via isar-users" <isar-users@googlegroups.com>]

On 05.09.25 14:41, Quirin Gylstorff wrote:
> 
> 
> On 9/5/25 14:32, Jan Kiszka wrote:
>> On 05.09.25 13:27, Quirin Gylstorff wrote:
>>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>>
>>> This allows to exchange the initramfs generator.
>>>
>>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>> ---
>>>   meta/classes/initramfs.bbclass | 3 ++-
>>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/meta/classes/initramfs.bbclass b/meta/classes/
>>> initramfs.bbclass
>>> index 658ef0ac..f9c919de 100644
>>> --- a/meta/classes/initramfs.bbclass
>>> +++ b/meta/classes/initramfs.bbclass
>>> @@ -10,6 +10,7 @@ INITRAMFS_INSTALL ?= ""
>>>   INITRAMFS_PREINSTALL ?= ""
>>>   INITRAMFS_ROOTFS ?= "${WORKDIR}/rootfs"
>>>   INITRAMFS_IMAGE_NAME = "${INITRAMFS_FULLNAME}.initrd.img"
>>> +INITRAMFS_GENERATOR_PKG ??= "initramfs-tools"
>>>   INITRD_DEPLOY_FILE = "${INITRAMFS_IMAGE_NAME}"
>>>     # Install proper kernel
>>> @@ -26,6 +27,6 @@ DEPENDS += "${INITRAMFS_INSTALL}"
>>>     ROOTFSDIR = "${INITRAMFS_ROOTFS}"
>>>   ROOTFS_FEATURES = "generate-manifest"
>>> -ROOTFS_PACKAGES = "initramfs-tools ${INITRAMFS_PREINSTALL}
>>> ${INITRAMFS_INSTALL}"
>>> +ROOTFS_PACKAGES = "${INITRAMFS_GENERATOR_PKG}
>>> ${INITRAMFS_PREINSTALL} ${INITRAMFS_INSTALL}"
>>>     inherit rootfs
>>
>> Do we need extra safety belts for the case that users create custom
>> initramfs hooks and set the wrong INITRAMFS_GENERATOR_PKG?
> 
> I am not sure if this will survive the next iteration. Reusing the
> initramfs class for dracut initrd leads to major pains if using in
> layers where the INITRAMFS_(PRE)INSTALL is set by *.conf.

No, it's really about flagging / preventing unsupported combos. We will
continue to support initramfs-hooks for a longer while, backward
compatibility. But now user should not try to generate custom initramfs
with those hooks while having switched to a different generator.

> 
> My current plan is to split it up and create a base class.

We will probably need completely different helpers to create custom
dracut modules, no?

Jan

-- 
Siemens AG, Foundational Technologies
Linux Expert Center

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