Re: [PATCH backup-restore-image 0/2] fix #7500: add EROFS and SquashFS filesystem support

[Christian Ebner <c.ebner@proxmox.com>]

On 7/27/26 3:49 PM, Elias Huhsovitz wrote:
> This patch series addresses Bug #7500 [1], where the file-restore kernel
> fails to mount EROFS-formatted partitions. This issue commonly affects
> users attempting to restore files from backups of Home Assistant OS.
> 
> The configuration choices in these patches are based on the standard
> Debian kernel configuration [2].
> 
> Patch 1/2 adds EROFS support, including the necessary
> decompression backends as defined in [4].
> 
> Patch 2/2 adds SquashFS support. While this patch is optional for resolving
> the specific Home Assistant OS bug, it ensures broad compatibility with
> various embedded Linux distributions and container images that rely on
> SquashFS.
> 
> For the SquashFS configuration, this series deliberately chooses
> `CONFIG_SQUASHFS_FILE_CACHE=y` and
> `CONFIG_SQUASHFS_COMPILE_DECOMP_SINGLE=y` instead of the Debian defaults
> (`FILE_DIRECT` and `MULTI_PERCPU`). This is to reduce complexity, memory
> footprint and memory overhead, which should be valued in a transient,
> resource-constrained virtual machine.
> 
> References:
> [1] https://bugzilla.proxmox.com/show_bug.cgi?id=7500
> [2] https://salsa.debian.org/kernel-team/linux/-/blob/debian/latest/debian/config/config
> [3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/squashfs/Kconfig
> [4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/erofs/Kconfig
> 

Thanks for the patches, welcome addition for Home Assistant user.

Build and tested single file restore using a backup from a Home 
Assistant OS VM.

Reviewed-by: Christian Ebner <c.ebner@proxmox.com>
Tested-by: Christian Ebner <c.ebner@proxmox.com>