Re: [RFC PATCH v3 05/10] Add class to generate custom dracut initramfs

["'Quirin Gylstorff' via isar-users" <isar-users@googlegroups.com>]

On 10/9/25 07:22, Hombourger, Cedric (FT FDS CES LX) wrote:
> On Mon, 2025-10-06 at 20:31 +0200, Quirin Gylstorff wrote:
>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>
>> This class allows to customize a dracut initramfs by using
>> configuration files add addition modules and drivers.
> 
> why restricting support for dracut to initramfs image recipes and not
> supporting a switch to dracut for "normal" rootfs? I believe your patch
> series provides all the required infrastructure to support both use-
> cases
> 

I didn't test it - but it should be possible to install dracut and it 
should switch normal rootfs to dracut.

This needs to be done by the user.

Quirin>>
>> It is recommended to use the addition of modules and drivers
>> sparely and prefer dracut configuration files.
>>
>> This class has the option to add custom modules automatically to
>> the initramfs if:
>>   - The modules are provided by the ISAR build system
>>   - The module name is part of the package name, valid names are
>>     - dracut-<module-name>
>>     - <module-name>-dracut
>>     - <something>-dracut-<module-name>
>>
>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>> ---
>>   meta/classes/initrd-dracut.bbclass | 49
>> ++++++++++++++++++++++++++++++
>>   1 file changed, 49 insertions(+)
>>   create mode 100644 meta/classes/initrd-dracut.bbclass
>>
>> diff --git a/meta/classes/initrd-dracut.bbclass
>> b/meta/classes/initrd-dracut.bbclass
>> new file mode 100644
>> index 00000000..a06296cc
>> --- /dev/null
>> +++ b/meta/classes/initrd-dracut.bbclass
>> @@ -0,0 +1,49 @@
>> +# This software is a part of ISAR.
>> +# This class provides the necessary options to
>> +# customize a dracut based initramfs.
>> +#
>> +# This class should not provide every dracut cmdline
>> +# option possible. Use the dracut configuration files.
>> +
>> +INITRAMFS_GENERATOR_PKG = "dracut"
>> +
>> +# The preferred way to configure dracut is to
>> +# provide dracut-config-<your-config> package which
>> +# contains all necessary config options
>> +DRACUT_CONFIG_PATH ??= ""
>> +DRACUT_EXTRA_DRIVERS ??= ""
>> +DRACUT_EXTRA_MODULES ??= ""
>> +DRACUT_EXTRACT_MODULES_FROM_PACKAGE_NAMES ??= "False"
>> +def extend_dracut_cmdline(d):
>> +    config_path = d.getVar('DRACUT_CONFIG_PATH') or ''
>> +    extra_drivers = d.getVar('DRACUT_CONFIG_PATH') or ''
>> +    extra_modules = d.getVar('DRACUT_CONFIG_PATH') or ''
>> +    enable_module_extraction =
>> bb.utils.to_boolean(d.getVar('DRACUT_EXTRACT_MODULES_FROM_PACKAGE_LIS
>> T'))
>> +    pkg_list = d.getVar('INITRAMFS_INSTALL') or ''
>> +
>> +    cmdline = []
>> +    modules_from_pkg_names = []
>> +    if enable_module_extraction:
>> +        for pkg in pkg_list.split():
>> +            # Skip dracut-config-* packages
>> +            if pkg.startswith('dracut-config-'):
>> +                continue
>> +            elif pkg.startswith('dracut-'):
>> +                modules_from_pkg_names.append(pkg[7:])
>> +            elif pkg.endswith('-dracut'):
>> +                modules_from_pkg_names.append(pkg[:-7])
>> +            elif '-dracut-' in pkg:
>> +                _, module_name = pkg.split('-dracut-', 1)
>> +                modules_from_pkg_names.append(module_name)
>> +        extra_modules = extra_modules + ' ' +'
>> '.join(modules_from_pkg_names)
>> +
>> +    if config_path:
>> +        cmdline.append(f"--conf {config_path}")
>> +    if extra_drivers:
>> +        cmdline.append(f"--add-drivers {extra_drivers}")
>> +    if extra_modules:
>> +        cmdline.append(f"--add {extra_modules}")
>> +    return ' '.join(cmdline)
>> +
>> +ROOTFS_INITRAMFS_GENERATOR_CMDLINE += "${@ extend_dracut_cmdline()}"
>> +inherit initramfs
> 
> 
> 


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