`_get_boot_image_output_file_format_from_dracut_code()` not compatible with dracut-ng

[aafeijoo-suse]

A few years ago I reported something similar (#2149), but this time the fix is not as easy as updating the regex pattern.

Since dracut-ng/dracut-ng@28820e2, the format of the initrd output file is set via configuration, so the code in dracut.sh changed from:

outfile="$dracutsysrootdir/boot/initramfs-${kernel}.img"

to:

outfile="${dracutsysrootdir-}/boot/$initrdname"

This $initrdname variable is defined in, for example:

• openSUSE: /usr/lib/dracut/dracut.conf.d/01-dist.conf - https://github.com/dracut-ng/dracut-ng/blob/30d121b1bd4ad2fb26ea72e1b0d5581663179882/dracut.conf.d/opensuse/01-dist.conf#L10
• Debian: ? - https://github.com/dracut-ng/dracut-ng/blob/30d121b1bd4ad2fb26ea72e1b0d5581663179882/dracut.conf.d/debian/01-debian.conf#L3

I came across this issue while integrating dracut-ng in openSUSE, since _get_boot_image_output_file_format_from_dracut_code() returns None, all openQA tests involving MicroOS images had the initrd named initramfs-<kver>.img, that is, it's taking the content of the default_outfile_format variable:

kiwi/kiwi/boot/image/base.py

Line 484 in 24e884d

default_outfile_format = 'initramfs-{kernel_version}.img'

While the initial image boots fine because kiwi also set grub entries using that initrd name, dracut generates new initrds using the configured $initrdname.

This issue is blocking the switch to dracut-ng in openSUSE.

[aafeijoo-suse]

dracut gained a --printconfig option, we could add $initrdname to that output, so it could be queried, but the value of the $kernel variable would be displayed expanded, so I don't know if this would help:

$ dracut --printconfig 2> /dev/null | sed -n 's/dracutconfig: initrdname=//p'
initrd-6.17.0-2-default

[schaefi]

Thanks much for reporting, this is really something we have to fix.

I'll take a look

[schaefi]

Fix available for review