Initramfs detection fails if the initramfs does not contain early CPIO

[koniiiik]

Here's the output of eclean-kernel -l on one of my systems:

#  eclean-kernel -l
other 6.18.12-gentoo-dist [6.18.12-gentoo-dist]
- initramfs: /boot/initramfs-6.18.12-gentoo-dist.img
- vmlinuz: /boot/kernel-6.18.12-gentoo-dist
- modules: /lib/modules/6.18.12-gentoo-dist
- build: /lib/modules/6.18.12-gentoo-dist/../../../src/linux-6.18.12-gentoo-dist
- last modified: 2026-02-24 18:19:26
other 6.18.8-gentoo-dist [CIFS]
- vmlinuz: /boot/initramfs-6.18.8-gentoo-dist.img
- last modified: 2026-02-17 17:41:36
other 6.18.8-gentoo-dist [6.18.8-gentoo-dist]
- vmlinuz: /boot/kernel-6.18.8-gentoo-dist
- modules: /lib/modules/6.18.8-gentoo-dist
- last modified: 2026-02-17 17:41:36
other 6.12.68-gentoo-dist [6.12.68-gentoo-dist]
- vmlinuz: /boot/kernel-6.12.68-gentoo-dist
- modules: /lib/modules/6.12.68-gentoo-dist
- last modified: 2026-02-13 11:11:03
other 6.12.68-gentoo-dist [CIFS]
- vmlinuz: /boot/initramfs-6.12.68-gentoo-dist.img
- last modified: 2026-02-13 11:11:03
other 6.12.63-gentoo-dist [CIFS]
- vmlinuz: /boot/initramfs-6.12.63-gentoo-dist.img
- last modified: 2026-01-29 21:04:19
other 6.12.63-gentoo-dist [6.12.63-gentoo-dist]
- vmlinuz: /boot/kernel-6.12.63-gentoo-dist
- modules: /lib/modules/6.12.63-gentoo-dist
- last modified: 2026-01-29 21:04:19

For all versions except for 6.18.12-gentoo-dist, the initramfs is parsed as a separate kernel image with invalid version information. This also leads to #27 when trying to clean up the mis-identified initramfs images.

The difference between 6.18.12-gentoo-dist and the older versions on this system is that it's the only one that contains the early CPIO with CPU microcode.