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Bug#1019412: initramfs-tools: Please support compressed firmware (new in Linux 5.19)

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Source: initramfs-tools
Version: 0.142
Severity: wishlist
Tags: patch

Dear Maintainer,

Resubmitting MR 61
  https://salsa.debian.org/kernel-team/initramfs-tools/-/merge_requests/61
to debbugs after 4 months.

The patches, in order, do the following:
  1. /sys/module/firmware_class/parameters/path, if any, is added before
     anything else in the module loading path:
     https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/base/firmware_loader/main.c?h=v5.17#n406
  2. When configured with FW_LOADER_COMPRESS, Linux additionally
     searches firmware with an .xz suffix and decompresses it in-kernel:
     https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/base/firmware_loader/main.c?h=v5.17#n754
  3. In 5.19, when configured with FW_LOADER_COMPRESS_ZSTD, Linux will
     additionally support ZSTD-compression with a .zst suffix:
     https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?h=driver-core-next&id=23cfbc6ec44e5e80d5522976ff45ffcdcddfb230

The end-goal of this is that I'd like the firmware for which this is a
gain to be installed compressed in Debian
(firmware-amd-graphics firmware-iwlwifi firmware-linux-free,
 a common setup, is 19M of .deb, 159M on-disk,
 but just 51M when subjected to
   find fw.xz/ -type f -exec xz {} \;
 (61M zstd default, 55M zstd -19);
 on one machine with that + 283M of xilinx firmware
 the gain is 464M -> 87M (116M, 94M)).

Best,
наб

-- System Information:
Debian Release: 11.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-17-amd64 (SMP w/24 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_FIRMWARE_WORKAROUND, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Bug#1019412: initramfs-tools: Please support compressed firmware (new in Linux 5.19) наб <nabijaczleweli@nabijaczleweli.xyz> - 2022-09-08 22:30 +0200

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